[CodeStyle][isort] introduce isort (part5)

[SigureMo]

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Describe

引入 isort 第五部分，格式化 python/paddle/tensor 目录及 python/paddle/common_ops_import.py

Note

为避免冲突，本 PR 不修改配置，将在主要 PR merge 后统一修改

Related links

• RFC：Python 引入 import 区域自动重排工具 isort 方案
• part1: [CodeStyle][isort] introducing isort (part1) #46475
• part2: [CodeStyle][isort] introduce isort (part2) #48390
• part3: [CodeStyle][isort] introduce isort (part3) #48401
• part4: [CodeStyle][isort] introduce isort (part4) #48402

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[SigureMo]

因为格式化后变化有点多，这里的实际 diff 如下：

# python/paddle/common_ops_import.py
- from paddle.tensor.layer_function_generator import templatedoc  # noqa: F401
+ from paddle.fluid.layers.layer_function_generator import (  # noqa: F401
+     templatedoc,
+ )

# python/paddle/tensor/math.py
- from paddle.common_ops_import import templatedoc
+ from .layer_function_generator import templatedoc

因为按照默认排序在 import paddle 时就会报如下错误

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/aistudio/Projects/Paddle/build/python/paddle/__init__.py", line 30, in <module>
    monkey_patch_variable()
  File "/home/aistudio/Projects/Paddle/build/python/paddle/fluid/layers/math_op_patch.py", line 600, in monkey_patch_variable
    import paddle.tensor
  File "/home/aistudio/Projects/Paddle/build/python/paddle/tensor/__init__.py", line 15, in <module>
    from .attribute import is_complex  # noqa: F401
  File "/home/aistudio/Projects/Paddle/build/python/paddle/tensor/attribute.py", line 24, in <module>
    from ..static import Variable
  File "/home/aistudio/Projects/Paddle/build/python/paddle/static/__init__.py", line 18, in <module>
    from . import nn  # noqa: F401
  File "/home/aistudio/Projects/Paddle/build/python/paddle/static/nn/__init__.py", line 15, in <module>
    from .common import fc  # noqa: F401
  File "/home/aistudio/Projects/Paddle/build/python/paddle/static/nn/common.py", line 20, in <module>
    from paddle.common_ops_import import (
  File "/home/aistudio/Projects/Paddle/build/python/paddle/common_ops_import.py", line 40, in <module>
    from paddle.tensor.layer_function_generator import templatedoc  # noqa: F401
  File "/home/aistudio/Projects/Paddle/build/python/paddle/tensor/layer_function_generator.py", line 32, in <module>
    from ..static import Variable

貌似是因为有循环依赖 tensor -> static -> common_ops_import -> tensor，因为这里 common_ops_import 包含一个从 paddle.tensor import 的函数 templatedoc（layer_function_generator 里的函数）

这就导致任何 import common_ops_import 的模块都会去 import tensor，很容易产生循环依赖，因此这里将这个 templatedoc 改为从 fluid.layers 里直接 import 了（tensor 下的 templatedoc 是从 fluid.layers copy 过来的，内容完全一致）

修改后 common_ops_import 里的全是 fluid 下的 API，可以保证非 fluid 模块引用时不会产生循环依赖

这里用图说明下改动：

Before	After

之后 common_ops_import 里的 templatedoc 应该会在清理 fluid 的时候就被清理掉了