【Hackathon 9th Sprint No.2】add api compatibility for paddle.autograd.function - part

[zade23]

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User Experience

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Description

新增 paddle.autograd.function.* 命名空间，兼容 PyTorch 的 torch.autograd.Function API

1. python/paddle/autograd/function/__init__.py - 兼容层实现
2. test/legacy_test/test_autograd_function_compatibility.py - 单元测试

PaConvert测试用例部分

用例类型	测试用例
相关API在PaConvert中新增/已有的案例	新增案例 test_autograd_function_FunctionCtx_save_for_forward.py test_autograd_function_FunctionCtx_mark_shared_storage.py 已有案例 test_autograd_Function.py test_autograd_Function_forward.py test_autograd_Function_backward.py test_autograd_function_FunctionCtx.py test_autograd_function_FunctionCtx_save_for_backward.py test_autograd_function_FunctionCtx_saved_tensors.py test_autograd_function_FunctionCtx_mark_non_differentiable.py test_autograd_function_FunctionCtx_set_materialize_grads.py
PaConvert测试未通过案例	test_autograd_function_FunctionCtx_save_for_backward.py test_autograd_function_FunctionCtx_saved_tensors.py test_autograd_Function.py

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[zade23]

/re-run all-failed

[zade23]

/re-run all-failed

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[zade23]

/re-run all-failed

[zhwesky2010]

@zade23 这个PR修改后能保证所有的PaConvert中torch.autograd的例子都通过吗，这个是本PR的修改目的。

[zade23]

@zade23 这个PR修改后能保证所有的PaConvert中torch.autograd的例子都通过吗，这个是本PR的修改目的。

我拉最新dev再测试一遍

[zhwesky2010]

@zade23 这个PR修改后能保证所有的PaConvert中torch.autograd的例子都通过吗，这个是本PR的修改目的。

我拉最新dev再测试一遍

paconvert测试结论贴到这里面来