* Post_training_quantizaion supports min_max methon

* add some API comments in paddle_analysis_config.h, test=develop

* add some API comments in paddle_analysis_config.h, test=develop

1. Rename AutoTracer to ProgramTranslator
2. Rename cached_program to program_cache
3. Remove some functor style __call__
4. Dict key should be string but not hash code of string

* 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

* fix dygraph double grad, test=develop

* fix unpack constructor, test=develop

* sequential reader stage 1, test=develop

* fix ut, test=develop

* fix iterable=False reset bug, add some logs and polish code, test=develop

* inference feed partial data, test=develop

* Turn on keep_order=True for test, test=develop

* enhance ut to test more cases, test=develop

* test commit for reverting

* Revert "test commit for reverting", test=develop

This reverts commit 80aef42e.

* add ut of merged and unmerged results, test=develop

* add more uts for coverages and add en doc of api, test=develop

* follow comments, test=develop

* change note style, test=develop

update embedding_eltwise_layernorm fuse pass and fused kernel, to support multi input

* add double grad implementation for dygraph, test=develop

* polish code, add uts, test=develop

* fix place bug, test=develop

* polish codes, add more uts for coverages, test=develop

* add no_grad_set, test=develop

* add star gan ut, test=develop

* follow comments, test=develop

As the title

* move __getitem__ to cpp

* bug fix

* add type check and gil release

* support negative step with omitted ends
test=develop

* code refine
test=develop

* bug fix
test=develop

* slice always return different pyobj
test=develop

* Support to use external function test=develop

* refine the parms of ast_to_func test=develop

* support to modify dict and list in while_loop test=develop

* polish code test=develop

test=develop

* fix div zero test=develop

* fix div zero test=develop

* add hostdevice function test=develop

* add eps when is zero test=develop

1. Add support for Break and Continue in Dygraph to Static
2. Also add support for gast.Not in NodeTestTransformer
3. Also add support for logical op transformation in LoopTransformer

initialize global nccl context in dygraph
test=develop

* don't add unregisterd attr, test=develop

* add some unittests,test=develop

This reverts commit 66fce9e8.

* remove unnecessary prepare data, test=develop

* Op in while block will not skip PrepareData, test=develop

* Support and/or in controlFlow if test=develop

add approximation for gelu, default value is False (only kernel with eigen is added, remove code for computing gelu with MKLDNN temporarily)

test=develop

* test=cpu

* test=cpu

* test=py2gcc8

* test=py2gcc8

* test=py2gcc8

* test=py2gcc8

* test=py2gcc8

* test=py2gcc8

* test=py2gcc8

* test=develop;test=document_fix;test=py2gcc8