* support gradient accumulation of fp16 in imperative mode, test=develop

* enhance coverage test, test=develop

* follow comments, test=develop

* simply C++ error stack once again, test=develop

* refactor code remove string pointer and recursive, test=develop

* add histc operator, test=develop

* update english doc to 2.0 API, test=develop

* update API from histc to histogram, test=develop
Co-authored-by: Nroot <root@yq01-gpu-255-129-15-00.epc.baidu.com>

Enhance error message of checkpoint_notify_op, fake_init_op gen_nccl_id_op and listen_and_serv_op (#24554)

test=develop

* Add isCached() mechanism for BatchNorm and LRN oneDNN operators
test=develop

* Formatting fix
test=develop

* add SetCommandLineOption

* add the print_FLAGS function

* remove the test demo

* modify the location of macro

* add the 'WITH_STATIC_LIB' option on windows

* modify the macro of PD_INFER_DECL

* modify the the fuction name

* modify the unittest

* modify the code style

* Add IsRuntime judgement in GRUUnit test=develop

* add IsRuntime judgement is GradOp test=develop

* Refine Error Message of SelecteInput/Output test=develop

* refine Error Message of RNNMemoryHelperOp test=develop

* append error op hint for grad op maker, test=develop

* add unittests for coverage, test=develop

* [dy2stat] Support len

* add convert_call func

* refine code test=develop

* Update PADDLE_ENFORCE in DNNL related ops
test=develop

* Abstract macro of OP_GET_PLACE_CHECK
test=develop

* update according to reviews

* update GET_PLACE_CPU_CHECK

* fix typo
test=develop

* revert macro
test=develop

* Support AucRunner in PaddleBox
* update some code style

* polish reader error message, test=develop

* fix detail error, test=develop

* reset activation dcudnn change, test=develop

* remove pow in speed up in dequantize_log test=develop

* remove pow in speed up in dequantize_log test=develop

* fix unittest test=develop

* Update isCached() to be thread freindly
test=develop

* Add isCached() check inside Softmax handler
test=develop

* Fix PaddleEnforce() message
test=develop