* add dlpack api and fix a from_dlpack 

* integrated gast library

* integrated gast library

* fix unittest and remove ast2.py

* remove 'gast' from __all__ in __init__.py

* add copyright in other files

* fix copyright

* del py2 code2

* fix test timeout

* add wget option in download

* Add GLIBCXX_USE_CXX11_ABI flag

* fix typo

* fix typo

* fix retry in download when exception occurs

* [OPs] Bug fix, fix the segment mean for illegal syncthreads usage. (#32596) (#32610)

* [OPs] Bug fix, fix the segment mean for illegal syncthreads usage.

* remove packages in __all__

* create new public api level paddle.callbacks;paddle.hub;paddle.utils.unique_name
Co-authored-by: NZhong Hui <zhonghui.net@gmail.com>

* Remove paddle_custom_op dynamic libraries, change link to FLUID_CORE on windows, and check copy_to

* fix CI

* Add deprecated warning info.

* Add unittest for deprecated decorator.

* Add warning info for tensor.grad

avoid polluting logging's root logger

add __all__=[] to python files not in API public list; import * only support in API public list files (#32643)

* update 2.0 public api in nn

* replace Chinese character cause error in ci;synchronization with pr:#32588 to avoid 'ascii' codec in python2

* numbers used in paddle.nn.functional.norm but not imported

* add Hub Module for easy to use pre-trained models.
*   support list, load, help fucntions.
*   support load models by github, gitee, local 
Co-authored-by: NLielinJiang <jianglielin@baidu.com>

* let paddle.utils.install_check support CPU package with GPU device

* use use_cuda in dygraph checking

* add unittest for install_check

* Remove old custom OP to reduce whl package volume

* [Custom OP]Remove old custom OP to reduce whl package volume

* support macos

* Remove old custom OP to reduce whl package volume

* [Custom OP]Remove old custom OP to reduce whl package volume

* support duplicable op inout

* add costom concat op test

* update comments

* auto specify PADDLE_WITH_MKLDNN and remove Interpretper

* remove print

* fix check abi

* fix windows

* fix compile flags

* Support Incremental compilation and Add Version management

* replace hash with hashlib

* add cpp_extension en doc

* remove cuda_cflags and add optional in doc

* refine style

* fix indent problem

* add default None

* add simple attr support and test

* add int, float attr support

* support other attribute

* add custom attrs test in cmake

* polish details

* fix test failed

* add backward test

* update test flags

* split cxx/nvcc compile flags

* enhance input argument check

* rename extra_cflags into extrac_cxx_flags

* add name checking in setup

* fix test_dispatch failed

* fix word typo and rm usless import statement

* refine import statement

* fix unittest failed

* fix cuda flags error

* add new custom op so

* fix use new method error

* fix test failed