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additional fix for resnet ctl benchamrk. As copybara needs exact spacing in the file, adding back the missing space.

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Add checks on if use_tf_function is true

benchmarks for the ctl with AMP

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The old infer_float32_policies policy will be removed from TensorFlow soon.

To test convergence, I ran the Resnet50KerasAccuracy.benchmark_8_gpu_fp16 benchmark. I got an accuracy of 0.76037 and an exp_per_second of 6908.

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Moving Keras ResNet models to `official/vision/image_classification` and benchmarks to `official/benchmark`.

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Also add `worker_hosts` and `task_index` flags.  These flags enable running the
model over multiple hosts by passing the cluster information via command line.

Setting `TF_CONFIG` will continue to work.

PiperOrigin-RevId: 263825245

* force_v2_in_keras_compile FLAG default to None and added seperate temp path.

* switch to force testing 1v path not force v2 path.

* Rename function force_v1_path.

* Force GPU placement for Resnet pure eager benchmark

* Create tweaked version of eager benchmark with explicit GPU placement

* Merged commit includes the following changes:
261380794  by haoyuzhang<haoyuzhang@google.com>:

    Internal change

261374439  by haoyuzhang<haoyuzhang@google.com>:

    Change Keras CTL dependencies from r1 ResNet to Keras ResNet.

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PiperOrigin-RevId: 261380794

* Revert unintentional change

* Revert unintentional change

261339941  by haoyuzhang<haoyuzhang@google.com>:

    Own library functions in Keras ResNet models, and remove dependencies on v1 Estimator version of ResNet models.

    Most dependencies that the Keras version has are related to data input pipelines. Created dedicated files (cifar_preprocessing.py, imagenet_preprocessing.py) to collect all logic handling Cifar and ImageNet data input function.

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261339166  by haoyuzhang<haoyuzhang@google.com>:

    Internal change

261317601  by akuegel<akuegel@google.com>:

    Internal change

261218818  by A. Unique TensorFlower<gardener@tensorflow.org>:

    Internal change

PiperOrigin-RevId: 261339941

* Restructure resnet estimator code to under official/r1

* Continue moving resnet code...

* Improved README.md

261171038  by gjn<gjn@google.com>:

    Remove weight_decay_rate 0 early exit check

    Removing this code path should be fine since this was actually not doing
    what it meant to do. Since weight_decay_rate is actually a tensor, the
    equality check was only looking at the id of the object and comparing to
    0. This should never be true. Evaluating a tensor is also not what we
    want to do at this point of the code. Thus it should be fine to simply
    remove this code.

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261169862  by haoyuzhang<haoyuzhang@google.com>:

    Internal change

261153520  by haoyuzhang<haoyuzhang@google.com>:

    Internal change

261140302  by hongkuny<hongkuny@google.com>:

    Clean up

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PiperOrigin-RevId: 261171038

* Add accuracy and performance Resnet runs with --force_v2_in_keras_compile = True.

* Fixed lint