api_reference.md

# API reference table

Due to the removal of the `mmcv.fileio`, `mmcv.runner`, `mmcv.parallel`, `mmcv.engine`, `mmcv.device` modules, and all classes and most of the functions in the `mmcv.utils` module during the upgrade from MMCV v1.x to MMCV v2.x, which were removed at PR [#2179](https://github.com/open-mmlab/mmcv/pull/2179), PR [#2216](https://github.com/open-mmlab/mmcv/pull/2216), PR [#2217](https://github.com/open-mmlab/mmcv/pull/2217). Therefore, we provide the following API reference table to make it easier to quickly find the migrated interfaces.

## Related issues, PRs and discussions

- [Remove runner, parallel, engine and device](https://github.com/open-mmlab/mmcv/pull/2216)
- [ImportError: cannot import name 'is_list_of' from 'mmcv.utils'](https://github.com/open-mmlab/mmcv/issues/2282)
- [Could not find the files in MMengine which are removed in MMCV_v2x parallel. example, for DataContainer](https://github.com/open-mmlab/mmcv/issues/2934)
- [mmcv.cnn.bricks.registry](https://github.com/open-mmlab/mmengine/discussions/1356)
- [Replace mmcv's function and modules imported with mmengine's](https://github.com/open-mmlab/mmdetection/pull/8594)

## `mmcv.fileio`

| MMCV                                              | MMCV URL                                                                              | MMEngine                                                    | MMEngine URL                                                                                   |
| ------------------------------------------------- | ------------------------------------------------------------------------------------- | ----------------------------------------------------------- | ---------------------------------------------------------------------------------------------- |
| mmcv.fileio.file_client.BaseStorageBackend        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.backends.base.BaseStorageBackend            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/backends/base.py              |
| mmcv.fileio.file_client.CephBackend               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             |                                                             |                                                                                                |
| mmcv.fileio.file_client.PetrelBackend             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.backends.petrel_backend.PetrelBackend       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/backends/petrel_backend.py    |
| mmcv.fileio.file_client.MemcachedBackend          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.backends.memcached_backend.MemcachedBackend | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/backends/memcached_backend.py |
| mmcv.fileio.file_client.LmdbBackend               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.backends.lmdb_backend.LmdbBackend           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/backends/lmdb_backend.py      |
| mmcv.fileio.file_client.HardDiskBackend           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.file_client.HardDiskBackend                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/file_client.py                |
| mmcv.fileio.file_client.HTTPBackend               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.backends.http_backend.HTTPBackend           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/backends/http_backend.py      |
| mmcv.fileio.file_client.FileClient                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/file_client.py             | mmengine.fileio.file_client.FileClient                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/file_client.py                |
| mmcv.fileio.io.load                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/io.py                      | mmengine.fileio.io.load                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/io.py                         |
| mmcv.fileio.io.dump                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/io.py                      | mmengine.fileio.io.dump                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/io.py                         |
| mmcv.fileio.io.\_register_handler                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/io.py                      | mmengine.fileio.handlers.\_register_handler                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/registry_utils.py    |
| mmcv.fileio.io.register_handler                   | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/io.py                      | mmengine.fileio.handlers.register_handler                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/registry_utils.py    |
| mmcv.fileio.parse.list_from_file                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/parse.py                   | mmengine.fileio.parse.list_from_file                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/parse.py                      |
| mmcv.fileio.parse.dict_from_file                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/parse.py                   | mmengine.fileio.parse.dict_from_file                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/parse.py                      |
| mmcv.fileio.handlers.base.BaseFileHandler         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/handlers/base.py           | mmengine.fileio.handlers.base.BaseFileHandler               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/base.py              |
| mmcv.fileio.handlers.json_handler.set_default     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/handlers/json_handler.py   | mmengine.fileio.handlers.json_handler.set_default           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/json_handler.py      |
| mmcv.fileio.handlers.json_handler.JsonHandler     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/handlers/json_handler.py   | mmengine.fileio.handlers.json_handler.JsonHandler           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/json_handler.py      |
| mmcv.fileio.handlers.pickle_handler.PickleHandler | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/handlers/pickle_handler.py | mmengine.fileio.handlers.pickle_handler.PickleHandler       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/pickle_handler.py    |
| mmcv.fileio.handlers.yaml_handler.YamlHandler     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/fileio/handlers/yaml_handler.py   | mmengine.fileio.handlers.yaml_handler.YamlHandler           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/fileio/handlers/yaml_handler.py      |

## `mmcv.runner`

| MMCV                                                                  | MMCV URL                                                                                    | MMEngine                                                                                                                                       | MMEngine URL                                                                                                                                                                                           |
| --------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| mmcv.runner.hooks.logger.base.LoggerHook                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/base.py             | mmengine.hooks.logger_hook.LoggerHook                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/logger_hook.py                                                                                                                         |
| mmcv.runner.hooks.logger.clearml.ClearMLLoggerHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/clearml.py          | Similar: mmengine.visualization.vis_backend.ClearMLVisBackend                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.logger.dvclive.DvcliveLoggerHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/dvclive.py          | Similar: mmengine.visualization.vis_backend.DVCLiveVisBackend                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.logger.mlflow.MlflowLoggerHook                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/mlflow.py           | Similar: mmengine.visualization.vis_backend.MLflowVisBackend                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.logger.neptune.NeptuneLoggerHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/neptune.py          | Similar: mmengine.visualization.vis_backend.NeptuneVisBackend                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.logger.pavi.PaviLoggerHook                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/pavi.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.logger.segmind.SegmindLoggerHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/segmind.py          |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.logger.tensorboard.TensorboardLoggerHook            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/tensorboard.py      | Similar: mmengine.visualization.vis_backend.TensorboardVisBackend                                                                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.logger.text.TextLoggerHook                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/text.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.logger.wandb.WandbLoggerHook                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/logger/wandb.py            | Similar: mmengine.visualization.vis_backend.WandbVisBackend                                                                                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/visualization/vis_backend.py                                                                                                                 |
| mmcv.runner.hooks.checkpoint.CheckpointHook                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/checkpoint.py              | mmengine.hooks.checkpoint_hook.CheckpointHook                                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/checkpoint_hook.py                                                                                                                     |
| mmcv.runner.hooks.closure.ClosureHook                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/closure.py                 |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.ema.EMAHook                                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/ema.py                     | mmengine.hooks.ema_hook.EMAHook                                                                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/ema_hook.py                                                                                                                            |
| mmcv.runner.hooks.evaluation.EvalHook                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/evaluation.py              | Some features have been moved to: mmengine.hooks.checkpoint_hook.CheckpointHook                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/checkpoint_hook.py                                                                                                                     |
| mmcv.runner.hooks.evaluation.DistEvalHook                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/evaluation.py              | Some features have been moved to: mmengine.hooks.checkpoint_hook.CheckpointHook                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/checkpoint_hook.py                                                                                                                     |
| mmcv.runner.hooks.hook.HOOKS                                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/hook.py                    | mmengine.registry.root.HOOKS                                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/root.py                                                                                                                             |
| mmcv.runner.hooks.hook.Hook                                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/hook.py                    | mmengine.hooks.hook.Hook                                                                                                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/hook.py                                                                                                                                |
| mmcv.runner.hooks.iter_timer.IterTimerHook                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/iter_timer.py              | mmengine.hooks.iter_timer_hook.IterTimerHook                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/iter_timer_hook.py                                                                                                                     |
| mmcv.runner.hooks.lr_updater.LrUpdaterHook                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.LRSchedulerMixin                                                                                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.FixedLrUpdaterHook                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.ConstantLR                                                                                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.StepLrUpdaterHook                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.StepLR                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.ExpLrUpdaterHook                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.ExponentialLR                                                                                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.PolyLrUpdaterHook                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.PolyLR                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.InvLrUpdaterHook                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.lr_updater.CosineAnnealingUpdaterHook               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.CosineAnnealingLR                                                                                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.FlatCosineAnnealingUpdaterHook           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.lr_updater.CosineRestartLrUpdaterHook               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.CosineRestartLR                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.get_position_from_periods                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.CosineRestartLR.get_position_from_periods                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.CyclicLrUpdaterHook                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.lr_updater.OneCycleLrUpdaterHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.OneCycleLR                                                                                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.LinearAnnealingLrUpdaterHook             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.lr_updater.annealing_cos                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.OneCycleLR.\_annealing_cos                                                                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.annealing_linear                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.OneCycleLR.\_annealing_linear                                                                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.lr_updater.format_param                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/lr_updater.py              | mmengine.optim.scheduler.lr_scheduler.OneCycleLR.\_format_param                                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/lr_scheduler.py                                                                                                              |
| mmcv.runner.hooks.memory.EmptyCacheHook                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/memory.py                  | mmengine.hoos.empty_cache_hook.EmptyCacheHook                                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/empty_cache_hook.py                                                                                                                    |
| mmcv.runner.hooks.momentum_updater.MomentumUpdaterHook                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        | mmengine.optim.scheduler.momentum_scheduler.MomentumSchedulerMixin                                                                             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/momentum_scheduler.py                                                                                                        |
| mmcv.runner.hooks.momentum_updater.StepMomentumUpdaterHook            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        | mmengine.optim.scheduler.momentum_scheduler.StepMomentum                                                                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/momentum_scheduler.py                                                                                                        |
| mmcv.runner.hooks.momentum_updater.CosineAnnealingMomentumUpdaterHook | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        | mmengine.optim.scheduler.momentum_scheduler.CosineAnnealingMomentum                                                                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/scheduler/momentum_scheduler.py                                                                                                        |
| mmcv.runner.hooks.momentum_updater.LinearAnnealingMomentumUpdaterHook | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.momentum_updater.CyclikcMomentumUpdaterHook         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.momentum_updater.OneCycleMomentumUpdaterHook        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/momentum_updater.py        |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.optimizer.OptimizerHook                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               | mmengine.optimizer.optimizer_wrapper.OptimWrapper                                                                                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/optimizer_wrapper.py                                                                                                         |
| mmcv.runner.hooks.optimizer.GradientCumulativeOptimizerHook           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.optimizer.Fp16OptimizerHook                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               | Moved to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.hooks.optimizer.GradientCumulativeFp16OptimizerHook       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.optimizer.Fp16OptimizerHook                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               | Moved to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.hooks.optimizer.GradientCumulativeFp16OptimizerHook       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/optimizer.py               |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.hooks.profiler.ProfilerHook                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/profiler.py                | mmengine.hooks.profiler_hook.ProfilerHook                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/profiler_hook.py                                                                                                                       |
| mmcv.runner.hooks.sampler_seed.DistSamplerSeedHook                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/sampler_seed.py            | mmengine.hooks.sampler_seed_hook.DistSamplerSeedHook                                                                                           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/sampler_seed_hook.py                                                                                                                   |
| mmcv.runner.hooks.sync_buffer.SyncbuffersHook                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/hooks/sync_buffer.py             | mmengine.hooks.sync_buffer_hook.SyncBufferHook                                                                                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/hooks/sync_buffer_hook.py                                                                                                                    |
| mmcv.runner.optimizer.builder.OPTIMIZERS                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             | mmengine.registry.root.OPTIMIZERS                                                                                                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/root.py                                                                                                                             |
| mmcv.runner.optimizer.builder.OPTIMIZER_BUILDERS                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.optimizer.builder.register_torch_optimizers               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             | mmengine.optim.optimizer.builder.register_torch_optimizers                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/builder.py                                                                                                                   |
| mmcv.runner.optimizer.builder.TORCH_OPTIMIZERS                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.optimizer.builder.build_optimizer_constructor             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.optimizer.builder.build_optimizer                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/builder.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.optimizer.default_constructor.DefaultOptimizerConstructor | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/optimizer/default_constructor.py |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.base_module.BaseModule                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/base_module.py                   | mmengine.model.base_module.BaseModule                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/base_module.py                                                                                                                         |
| mmcv.runner.base_module.Sequential                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/base_module.py                   | mmengine.model.base_module.Sequential                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/base_module.py                                                                                                                         |
| mmcv.runner.base_module.ModuleList                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/base_module.py                   | mmengine.model.base_module.ModuleList                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/base_module.py                                                                                                                         |
| mmcv.runner.base_module.ModuleDict                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/base_module.py                   | mmengine.model.base_module.ModuleDict                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/base_module.py                                                                                                                         |
| mmcv.runner.base_runner.BaseRunner                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/base_runner.py                   | mmengine.runner.runner.Runner                                                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/runner.py                                                                                                                             |
| mmcv.runner.builder.RUNNERS                                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/builder.py                       | mmengine.registry.root.RUNNERS                                                                                                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/root.py                                                                                                                             |
| mmcv.runner.builder.RUNNER_BUILDERS                                   | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/builder.py                       | mmengine.registry.root.RUNNER_CONSTRUCTORS                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/root.py                                                                                                                             |
| mmcv.runner.builder.build_runner_constructor                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/builder.py                       |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.builder.build_runner                                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/builder.py                       |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.checkpoint.ENV_MMCV_HOME                                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.ENV_MMENGINE_HOME                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.ENV_XDG_CACHE_HOME                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.ENV_XDG_CACHE_HOME                                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.DEFAULT_CACHE_HOME                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.DEFAULT_CACHE_DIR                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.\_get_mmcv_home                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.\_get_mmengine_home                                                                                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_state_dict                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_state_dict                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.get_torchvision_models                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.get_torchvision_models                                                                                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.get_external_models                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.get_external_models                                                                                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.get_mmcls_models                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.get_mmcls_models                                                                                                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.get_deprecated_model_names                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.get_deprecated_model_names                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.\_process_mmcls_checkpoint                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.\_process_mmcls_checkpoint                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.CheckpointLoader                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.CheckpointLoader                                                                                                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_local                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_local                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_http                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_http                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_pavi                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_pavi                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_ceph                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_ceph                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_torchvision                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_torchvision                                                                                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_openmmlab                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_openmmlab                                                                                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_from_mmcls                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_from_mmcls                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.\_load_checkpoint                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.\_load_checkpoint                                                                                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.\_load_checkpoint_with_prefix                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.\_load_checkpoint_with_prefix                                                                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.load_checkpoint                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.load_checkpoint                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.weights_to_cpu                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.weights_to_cpu                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.\_save_to_state_dict                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.\_save_to_state_dict                                                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.get_state_dict                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.get_state_dict                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.checkpoint.save_checkpoint                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/checkpoint.py                    | mmengine.runner.checkpoint.save_checkpoint                                                                                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/checkpoint.py                                                                                                                         |
| mmcv.runner.default_coonstructor.DefaultRunnerConstructor             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/default_constructor.py           |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.dist_utils.\_find_free_port                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.dist_utils.\_is_free_port                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.dist_utils.init_dist                                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.init_dist                                                                                                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.\_init_dist_pytorch                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.\_init_dist_pytorch                                                                                                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.\_init_dist_mpi                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.\_init_dist_mpi                                                                                                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.\_init_dist_slurm                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.\_init_dist_slurm                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.get_dist_info                                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.get_dist_info                                                                                                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.master_only                                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    | mmengine.dist.utils.master_only                                                                                                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dist/utils.py                                                                                                                                |
| mmcv.runner.dist_utils.allreduce_params                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.dist_utils.allreduce_grads                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.dist_utils.\_allreduce_coalesced                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/dist_utils.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.epoch_based_runner.EpochBasedRunner                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/epoch_based_runner.py            | mmengine.runner.loops.EpochBasedTrainLoop                                                                                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/loops.py                                                                                                                              |
| mmcv.runner.epoch_based_runner.Runner                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/epoch_based_runner.py            |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.fp16_utils.cast_tensor_type                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.auto_fp16                                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.force_fp32                                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.allreduce_grads                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.wrap_fp16_model                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.patch_norm_fp32                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.patch_forward_method                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.fp16_utils.LossScaler                                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/fp16_utils.py                    | Moved fp16-related to: mmengine.optimizer.amp_optimizer_wrapper.AmpOptimWrapper and mmengine.optimizer.apex_optimizer_wrapper.ApexOptimWrapper | https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/amp_optimizer_wrapper.py https://github.com/open-mmlab/mmengine/blob/main/mmengine/optim/optimizer/apex_optimizer_wrapper.py |
| mmcv.runner.iter_based_runner.IterLoader                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/iter_based_runner.py             |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.iter_based_runner.IterBasedRunner                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/iter_based_runner.py             | mmengine.runner.loops.IterBasedTrainLoop                                                                                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/loops.py                                                                                                                              |
| mmcv.runner.log_buffer.LogBuffer                                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/log_buffer.py                    |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.priority.Priority                                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/priority.py                      | mmengine.runer.priority.Priority                                                                                                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/priority.py                                                                                                                           |
| mmcv.runner.priority.get_priority                                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/priority.py                      | mmengine.runner.priority.get_priority                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/priority.py                                                                                                                           |
| mmcv.runner.utils.get_host_info                                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/utils.py                         |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.utils.get_time_str                                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/utils.py                         |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.utils.obj_from_dict                                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/utils.py                         |                                                                                                                                                |                                                                                                                                                                                                        |
| mmcv.runner.utils.set_random_seed                                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/runner/utils.py                         | mmengine.runner.utils.set_random_seed                                                                                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/runner/utils.py                                                                                                                              |

## `mmcv.parallel`

| MMCV                                                           | MMCV URL                                                                       | MMEngine                                                       | MMEngine URL                                                                              |
| -------------------------------------------------------------- | ------------------------------------------------------------------------------ | -------------------------------------------------------------- | ----------------------------------------------------------------------------------------- |
| mmcv.parallel.\_functions.scatter                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/_functions.py     |                                                                |                                                                                           |
| mmcv.parallel.\_functions.synchronize_stream                   | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/_functions.py     |                                                                |                                                                                           |
| mmcv.parallel.\_functions.get_input_device                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/_functions.py     |                                                                |                                                                                           |
| mmcv.parallel.\_functions.Scatter                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/_functions.py     |                                                                |                                                                                           |
| mmcv.parallel.collate.collate                                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/collate.py        |                                                                |                                                                                           |
| mmcv.parallel.data_container.assert_tensor_type                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/data_container.py |                                                                |                                                                                           |
| mmcv.parallel.data_container.DataContainer                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/data_container.py | Similar: mmengine/structures/base_data_element.BaseDataElement | https://github.com/open-mmlab/mmengine/blob/main/mmengine/structures/base_data_element.py |
| mmcv.parallel.data_parallel.MMDataParallel                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/data_parallel.py  |                                                                |                                                                                           |
| mmcv.parallel.distributed.MMDistributedDataParallel            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/distributed.py    | mmengine.model.wrappers.distributed.MMDistributedDataParallel  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/wrappers/distributed.py   |
| mmcv.parallel.distributed_deprecated.MMDistributedDataParallel | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/distributed.py    | mmengine.model.wrappers.distributed.MMDistributedDataParallel  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/wrappers/distributed.py   |
| mmcv.parallel.registry.MODULE_WRAPPERS                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/registry.py       | mmengine.registry.root.MODEL_WRAPPERS                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/root.py                |
| mmcv.parallel.scatter_gather.scatter                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/scatter_gather.py |                                                                |                                                                                           |
| mmcv.parallel.scatter_gather.scatter_kwargs                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/scatter_gather.py |                                                                |                                                                                           |
| mmcv.parallel.utils.is_module_wrapper                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/parallel/utils.py          | mmengine.model.wrappers.utils.is_model_wrapper                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/wrappers/utils.py         |

## `mmcv.engine`

| MMCV                                 | MMCV URL                                                           | MMEngine | MMEngine URL |
| ------------------------------------ | ------------------------------------------------------------------ | -------- | ------------ |
| mmcv.engine.test.single_gpu_test     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/engine/test.py |          |              |
| mmcv.engine.test.multi_gpu_test      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/engine/test.py |          |              |
| mmcv.engine.test.collect_results_cpu | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/engine/test.py |          |              |
| mmcv.engine.test.collect_results_gpu | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/engine/test.py |          |              |

## `mmcv.device`

| MMCV                                      | MMCV URL                                                                     | MMEngine                         | MMEngine URL                                                              |
| ----------------------------------------- | ---------------------------------------------------------------------------- | -------------------------------- | ------------------------------------------------------------------------- |
| mmcv.device.ipu                           | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/device/ipu               |                                  |                                                                           |
| mmcv.device.mlu                           | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/device/mlu               |                                  |                                                                           |
| mmcv.device.mps                           | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/device/mps               |                                  |                                                                           |
| mmcv.device.npu                           | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/device/npu               |                                  |                                                                           |
| mmcv.device.\_functions.scatter           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/device/_functions.py     |                                  |                                                                           |
| mmcv.device.\_functions.Scatter           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/device/_functions.py     |                                  |                                                                           |
| mmcv.device.scatter_gather.scatter        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/device/scatter_gather.py |                                  |                                                                           |
| mmcv.device.scatter_gather.scatter_kwargs | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/device/scatter_gather.py |                                  |                                                                           |
| mmcv.device.utils.get_device              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/device/utils.py          | mmengine.device.utils.get_device | https://github.com/open-mmlab/mmengine/blob/main/mmengine/device/utils.py |

## `mmcv.utils`

| MMCV                                                   | MMCV URL                                                                     | MMEngine                                                            | MMEngine URL                                                                                |
| ------------------------------------------------------ | ---------------------------------------------------------------------------- | ------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- |
| mmcv.utils.config.BASE_KEY                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.BASE_KEY                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.DELETE_KEY                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.DELETE_KEY                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.DEPRECATION_KEY                      | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.DEPRECATION_KEY                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.ConfigDict                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.ConfigDict                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.add_args                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.add_args                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.Config                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.Config                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.config.DictAction                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/config.py          | mmengine.config.config.DictAction                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/config/config.py                  |
| mmcv.utils.device_type.is_ipu_available                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/device_type.py     |                                                                     |                                                                                             |
| mmcv.utils.device_type.IS_IPU_AVAILABLE                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/device_type.py     |                                                                     |                                                                                             |
| mmcv.utils.device_type.is_mlu_available                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/device_type.py     | mmengine.device.utils.is_mlu_available                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/device/utils.py                   |
| mmcv.utils.device_type.is_mps_available                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/device_type.py     | mmengine.device.utils.is_mps_available                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/device/utils.py                   |
| mmcv.utils.device_type.is_npu_available                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/device_type.py     | mmengine.device.utils.is_npu_available                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/device/utils.py                   |
| mmcv.utils.hub.\_is_legacy_zip_format                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/hub.py             | mmengine.utils.dl_utils.hub.\_is_legacy_zip_format                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/hub.py             |
| mmcv.utils.hub.\_legacy_zip_load                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/hub.py             | mmengine.utils.dl_utils.hub.\_legacy_zip_load                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/hub.py             |
| mmcv.utils.hub.load_url                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/hub.py             | mmengine.utils.dl_utils.hub.load_url                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/hub.py             |
| mmcv.utils.logging.logger_initialized                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/logging.py         |                                                                     |                                                                                             |
| mmcv.utils.logging.get_logger                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/logging.py         |                                                                     |                                                                                             |
| mmcv.utils.logging.print_log                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/logging.py         |                                                                     |                                                                                             |
| mmcv.utils.misc.\_ntuple                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.\_ntuple                                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.to_1tuple                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.to_1tuple                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.to_2tuple                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.to_2tuple                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.to_3tuple                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.to_3tuple                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.to_4tuple                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.to_4tuple                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.to_ntuple                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.to_ntuple                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.is_str                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.is_str                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.import_modules_from_strings            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.import_modules_from_strings                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.iter_cast                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.iter_cast                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.list_cast                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.list_cast                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.tuple_cast                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.tuple_cast                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.is_seq_of                              | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.is_seq_of                                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.is_list_of                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.is_list_of                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.is_tuple_of                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.is_tuple_of                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.slice_list                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.slice_list                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.concat_list                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.concat_list                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.check_prerequisites                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.check_prerequisites                             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.\_check_py_package                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.\_check_py_package                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.\_check_executable                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.\_check_executable                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.requires_package                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.requires_package                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.requires_executable                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.requires_executable                             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.deprecated_api_warning                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.deprecated_api_warning                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.is_method_overridden                   | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.is_method_overridden                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.misc.has_method                             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/misc.py            | mmengine.utils.misc.has_method                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/misc.py                     |
| mmcv.utils.parrots_wrapper.TORCH_VERSION               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.TORCH_VERSION               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.is_cuda_available           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.devices.utils.is_cuda_available                            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/device/utils.py                   |
| mmcv.utils.parrots_wrapper.IS_CUDA_AVAILABLE           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py |                                                                     |                                                                                             |
| mmcv.utils.parrots_wrapper.is_rocm_pytorch             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.is_rocm_pytorch             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_cuda_home             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_cuda_home             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.get_build_config            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.get_build_config            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_conv                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_conv                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_dataloader            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_dataloader            | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_extension             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_extension             | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_pool                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_pool                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.\_get_norm                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.\_get_norm                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.parrots_wrapper.SyncBatchNorm               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/parrots_wrapper.py | mmengine.utils.dl_utils.parrots_wrapper.SyncBatchNorm               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/parrots_wrapper.py |
| mmcv.utils.path.is_filepath                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.is_filepath                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.fopen                                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.fopen                                           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.check_file_exist                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.path.check_file_exist                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.mkdir_or_exist                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.mkdir_or_exist                                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.symlink                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.symlink                                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.scandir                                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.scandir                                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.path.find_vcs_root                          | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/path.py            | mmengine.utils.path.find_vcs_root                                   | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/path.py                     |
| mmcv.utils.progressbar.ProgressBar                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/progressbar.py     | mmengine.utils.progressbar.ProgressBar                              | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/progressbar.py              |
| mmcv.utils.progressbar.track_progress                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/progressbar.py     | mmengine.utils.progressbar.track_progress                           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/progressbar.py              |
| mmcv.utils.progressbar.init_pool                       | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/progressbar.py     | mmengine.utils.progressbar.init_pool                                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/progressbar.py              |
| mmcv.utils.progressbar.track_parallel_progress         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/progressbar.py     | mmengine.utils.progressbar.track_parallel_progress                  | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/progressbar.py              |
| mmcv.utils.progressbar.track_iter_progress             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/progressbar.py     | mmengine.utils.progressbar.track_iter_progress                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/progressbar.py              |
| mmcv.utils.registry.build_from_cfg                     | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/registry.py        | mmengine.registry.build_functions.build_from_cfg                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/build_functions.py       |
| mmcv.utils.registry.Registry                           | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/registry.py        | mmengine.registry.registry.Registry                                 | https://github.com/open-mmlab/mmengine/blob/main/mmengine/registry/registry.py              |
| mmcv.utils.seed.worker_init_fn                         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/seed.py            | mmengine.dataset.utils.worker_init_fn                               | https://github.com/open-mmlab/mmengine/blob/main/mmengine/dataset/utils.py                  |
| mmcv.utils.testing.check_python_script                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.check_python_script                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.\_any                               | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.\_any                                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_dict_contains_subset         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_dict_contains_subset                | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_attrs_equal                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_attrs_equal                         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_dict_has_keys                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_dict_has_keys                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_keys_equal                   | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_keys_equal                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_is_norm_layer                | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_is_norm_layer                       | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.testing.assert_params_all_zeros             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/testing.py         | mmengine.testing.compare.assert_params_all_zeros                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/testing/compare.py                |
| mmcv.utils.timer.TimerError                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/timer.py           | mmengine.utils.timer.TimerError                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/timer.py                    |
| mmcv.utils.timer.Timer                                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/timer.py           | mmengine.utils.timer.Timer                                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/timer.py                    |
| mmcv.utils.timer.\_g_timers                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/timer.py           | mmengine.utils.timer.\_g_timers                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/timer.py                    |
| mmcv.utils.timer.check_time                            | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/timer.py           | mmengine.utils.timer.check_time                                     | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/timer.py                    |
| mmcv.utils.torch_ops.\_torch_version_meshgrid_indexing | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/torch_ops.py       | mmengine.utils.dl_utils.torch_ops.\_torch_version_meshgrid_indexing | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/torch_ops.py       |
| mmcv.utils.torch_ops.torch_meshgrid                    | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/torch_ops.py       | mmengine.utils.dl_utils.torch_ops.torch_meshgrid                    | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/torch_ops.py       |
| mmcv.utils.trace.is_jit_tracing                        | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/trace.py           | mmengine.utils.dl_utils.trace.is_jit_tracing                        | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/dl_utils/trace.py           |
| mmcv.utils.version_utils.digit_version                 | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/version_utils.py   | mmengine.utils.version_utils.digit_version                          | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/version_utils.py            |
| mmcv.utils.version_utils.\_minimal_ext_cmd             | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/version_utils.py   | mmengine.utils.version_utils.\_minimal_ext_cmd                      | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/version_utils.py            |
| mmcv.utils.version_utils.get_git_hash                  | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/utils/version_utils.py   | mmengine.utils.version_utils.get_git_hash                           | https://github.com/open-mmlab/mmengine/blob/main/mmengine/utils/version_utils.py            |

## `mmcv.cnn`

| MMCV                                         | MMCV URL                                                                 | MMEngine                                   | MMEngine URL                                                             |
| -------------------------------------------- | ------------------------------------------------------------------------ | ------------------------------------------ | ------------------------------------------------------------------------ |
| mmcv.cnn.utils.sync_bn.\_BatchNormXd         | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/cnn/utils/sync_bn.py | mmengine.model.utils.\_BatchNormXd         | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/utils.py |
| mmcv.cnn.utils.sync_bn.revert_sync_batchnorm | https://github.com/open-mmlab/mmcv/blob/v1.7.1/mmcv/cnn/utils/sync_bn.py | mmengine.model.utils.revert_sync_batchnorm | https://github.com/open-mmlab/mmengine/blob/main/mmengine/model/utils.py |

## `mmcv.model_zoo`

| MMCV                                 | MMCV URL                                                                            | MMEngine                           | MMEngine URL                                                                        |
| ------------------------------------ | ----------------------------------------------------------------------------------- | ---------------------------------- | ----------------------------------------------------------------------------------- |
| mmcv.model_zoo.deprecated.json       | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/model_zoo/deprecated.json       | mmengine.hub.deprecated.json       | https://github.com/open-mmlab/mmengine/tree/main/mmengine/hub/deprecated.json       |
| mmcv.model_zoo.mmcls.json            | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/model_zoo/mmcls.json            | mmengine.hub.mmcls.json            | https://github.com/open-mmlab/mmengine/tree/main/mmengine/hub/mmcls.json            |
| mmcv.model_zoo.open_mmlab.json       | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/model_zoo/open_mmlab.json       | mmengine.hub.openmmlab.json        | https://github.com/open-mmlab/mmengine/tree/main/mmengine/hub/openmmlab.json        |
| mmcv.model_zoo.torchvision_0.12.json | https://github.com/open-mmlab/mmcv/tree/v1.7.1/mmcv/model_zoo/torchvision_0.12.json | mmengine.hub.torchvision_0.12.json | https://github.com/open-mmlab/mmengine/tree/main/mmengine/hub/torchvision_0.12.json |