add multi-thread for nlp unit-tests

Support grouped convolution layer with mkldnn.

hotfix for conv-relu pass

fix with distribute cmake

* trainer auto wait pserver port ready

* add file

* fix docstring

* add option to not wait

* update api spec

* clean

* fix test hang

add analyzer_rnn2_test

disable seqexpandconcatfc op test on Mac

fix mac test_reader_reset

fix mac test_data_balance

import os module to use os.environ in setUp()

fix fusion_lstm unique_name bug

update-readme

Refine/infershape

Fix manylinux ci random fail problem

fix ner_test when bs>1

fix test_parallel_executor_transformer

fix test_py_reader_using_executor error

fix program desc unit test error

refine lac ut and fix fetch