enable API check for readers

* layer fixes test=develop

* follow update test=develop

add more files to protected file list

* fix api format and examples

test=develop

* Update executor.py

test=develop

* Update nn.py

* Update nn.py

test=develop

* Update nn.py

test=develop

Fix sequence_mask_op InferShape

test=develop

Revert "Add EstiminateFlops"

Add YOLOv3 loss operator for YOLOv3 model

add mac ci check on import

test=develop

update is_test_pass and mkldnn_placement_pass

Implementing ngraph engine

test=develop

add ignore index for sigmoid cross entropy with logits op, test=develop

Add cudnn lstm

Stablize decorator test

Add EstiminateFlops

add the comment for CheckFile function

Update checkfile in datafeed

update CheckFile function in data_feed for ignore the space at the end of each line of data(for example, it may be added '\t' character to the end of the reduce task output when processes data by hadoop, which does not affect the correctness of the data). test=develop

Merge pull request #14697 from PaddlePaddle/revert-14693-fix-for-accuracy-problem-for-inlplace-operators

Revert "Fix for accuracy problem for inplace operators when MKL-DNN mode is enabled"

Fix for accuracy problem for inplace operators when MKL-DNN mode is enabled