* add PADDLE_ENFORCE for dygraph to optimize error throw, test=develop

* fix some error, test=develop

* delete PADDLE_ENFORCE_EQ in VarBase::NewVarBase, test=develop

* add op indicate var type method call check

* add error test example, test=develop, test=document_fix

* add count judge, test=develop, test=document_fix

* polish example detail, test=develop, test=document_fix

* test indicate var data type method, test=develop, test=document_fix

* test no get expect kernel type, test=develop, test=document_fix

* remove test case, test=develop test=document_fix

* jit/trace 1st version, test=develop

* add more unittests, test=develop

The op should handle k=1024

test=develop
Signed-off-by: Nzhaoyuchen <zhaoyuchen01@baidu.com>

* refine Categorical and MultivariateNormalDiag en doc test=develop, test=document_fix

* refine Categorical and MultivariateNormalDiag en doc test=develop, test=document_fix

This reverts commit dc229b41.

Bug Fix: Paddle-TRT cannot handle adaptive pooling in pool2d op converter and "num" attribute in split op converter (#20733)

* fix pool2d trt converter, test=develop

* add fix for split op converter, test=develop

* mv sampcd_processor.py to tools

test=develop test=document_fix

* update example script

test=develop test=document_fix

* update the infer shape of matmul,  test=release/1.6

* add unittests of matmul, test=release/1.6

* change func names, test=develop

test=develop

* add support for __get_item__ of Variable test=develop

fix ExecutionContext::HasInput and ExecutionContext::HasOutput depend on the scope structure, test=develop (#20721)

* add cuda place and remove fluid.layers.data for test of python API, test=develop

* add cuda place and remove fluid.layers.data for test of python API, test=develop

* modified batch size for Python API test, test=develop

* add dlpack include in third_party. test=develop

* test=develop, communicator_is_sgd_optimizer flags

* support MLU nums, test=develop

* change anakin apis, test=develop

* add support to gcc8, add docker env test=develop

* add check nan / inf in downpour worker during training
* test=develop