* add save with prefix (#23449)
* add unit accessor (#23703)
* test=develop

* fix no_cvm in config_fleet (#22818)
* support get pslib version (#22835)
* add clear one table (#23089)
* fix dump slot in strategy (#23398)

* test=develop, add index sample op in contrib

* cherry-pick tdm_sampler

* test=develop, cherry-pick tdm_child op

* Fixed warpctc, test=develop

* Set lod level of sequence_unpad's output to 1 in compile time

test=develop

* fix the en doc and example code of warpctc, test=develop, test=document_fix

* change the cmake and apis of lite engine, test=develop

* change the cmake of lite engine, test=develop

* don't add unregisterd attr, test=develop

* add some unittests,test=develop

test=develop test=release/1.7

* cherry-pick add dequantize_log_op and make pyramid hash support int8 weight  (#22548)

* add dequantize_log_op and make pyramid hash support int8 weight test=develop

* add unittest and update pyramid hash op test=develop

* remove paddle_enforce test=develop

* fix error message test=develop

* remove incorrent commit test=develop

* fix error message in log_dequantize test=develop

* change 2019 to 2020 test=develop

* remove useless check_grad test=develop

* cherry-pick fix compile error in win gpu  (#23196)

* fix compile error in win gpu test=develop

* fix compile error in win gpu test=develop

* fix compile error in win gpu test=develop

* support feed_python_builtin, test=develop

* add test, test=develop

* support CompiledProgram, test=develop

* support fluid.data, test=develop

* fix ci problems, test=develop

* follow comments, test=develop

* update readme for release/1.7, test=develop (#22764)

* fix the travic ci problem

speed create clip op

* fix communicator when breaking under PyReader mode, test=develop
* revert some vlog level to 0, test=develop

* fix fc padding during fusion, test=develop

* fix optim model inference after SaveOptimModel, test=develop

* change the function in op_teller, test=develop

* correct the commit-id, test=develop

test=release/1.7

test=release/1.7

* support slice double grad, test=develop
* merge two doublegradopmaker to one doublegradopmaker,test=develop
* change the shape of slice_OP's unittest, test=develop

* test=develop, bug fix for trainer_factory (#22751)

* test=develop, optimize distributedstrategy (#22677)

cherry-pick from the branch develop，fix the overflow of sequence2batch

* add recorded cuda memory apis, fix typo, test=develop

* add more ut, test=develop

* follow comments, test=release/1.7

* fix py35 incompatible issues, test=release/1.7