[format] Run lint on colossalai.engine (#3367)

colossalai/engine/gradient_accumulation/__init__.py

+from typing import Iterable, List
+
 import torch.nn as nn
-from typing import List
-from colossalai.engine import BaseGradientHandler
-from typing import Iterable
 from torch.optim import Optimizer
 from torch.optim.lr_scheduler import _LRScheduler
-from ._gradient_accumulation import GradAccumDataloader, GradAccumOptimizer, GradAccumLrSchedulerByStep, GradAccumGradientHandler
+
+from colossalai.engine import BaseGradientHandler
+
+from ._gradient_accumulation import (
+    GradAccumDataloader,
+    GradAccumGradientHandler,
+    GradAccumLrSchedulerByStep,
+    GradAccumOptimizer,
+)
 
 __all__ = [
     'accumulate_gradient', 'GradAccumDataloader', 'GradAccumOptimizer', 'GradAccumLrSchedulerByStep',

colossalai/engine/gradient_handler/_data_parallel_gradient_handler.py

 from colossalai.core import global_context as gpc
 from colossalai.registry import GRADIENT_HANDLER
-from ._base_gradient_handler import BaseGradientHandler
+
 from ...context.parallel_mode import ParallelMode
+from ._base_gradient_handler import BaseGradientHandler
 from .utils import bucket_allreduce
 
 

colossalai/engine/gradient_handler/_pipeline_parallel_gradient_handler.py

@@ -4,9 +4,10 @@ from collections import defaultdict
 
 import torch
 import torch.distributed as dist
+from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
+
 from colossalai.core import global_context as gpc
 from colossalai.registry import GRADIENT_HANDLER
-from torch._utils import _flatten_dense_tensors, _unflatten_dense_tensors
 
 from ._base_gradient_handler import BaseGradientHandler
 

colossalai/engine/gradient_handler/_sequence_parallel_gradient_handler.py

 from colossalai.core import global_context as gpc
 from colossalai.registry import GRADIENT_HANDLER
-from ._base_gradient_handler import BaseGradientHandler
+
 from ...context.parallel_mode import ParallelMode
+from ._base_gradient_handler import BaseGradientHandler
 from .utils import bucket_allreduce
 
 

colossalai/engine/gradient_handler/_zero_gradient_handler.py

 from colossalai.registry import GRADIENT_HANDLER
+
 from ._base_gradient_handler import BaseGradientHandler
 
 

colossalai/engine/schedule/__init__.py

 from ._base_schedule import BaseSchedule
-from ._pipeline_schedule import PipelineSchedule, InterleavedPipelineSchedule, get_tensor_shape
 from ._non_pipeline_schedule import NonPipelineSchedule
+from ._pipeline_schedule import InterleavedPipelineSchedule, PipelineSchedule, get_tensor_shape
 
 __all__ = ['BaseSchedule', 'NonPipelineSchedule', 'PipelineSchedule', 'InterleavedPipelineSchedule', 'get_tensor_shape']

colossalai/engine/schedule/_base_schedule.py

@@ -2,10 +2,10 @@
 # -*- encoding: utf-8 -*-
 
 from abc import ABC, abstractmethod
+from typing import Callable, Iterable
 
 import torch
 
-from typing import Iterable, Callable
 from colossalai.logging import get_dist_logger
 from colossalai.utils import get_current_device
 

colossalai/engine/schedule/_non_pipeline_schedule.py

 #!/usr/bin/env python
 # -*- encoding: utf-8 -*-
 
-from typing import Iterable
+import inspect
+from typing import Callable, Iterable
 
 import torch
-import inspect
-from ._base_schedule import BaseSchedule
+
 from colossalai.utils import conditional_context
-from typing import Callable
+
+from ._base_schedule import BaseSchedule
 
 
 class NonPipelineSchedule(BaseSchedule):