* test=develop, hide build once usage

* test=develop, polish code

fix bug of gan in python3

* add ce for lexical_analysis

* add ce for lexical_analysis

* add ce for lexical_analysis

* add ce for lexical_analysis

* add warning for class_num mismatch

* change to value error

* add pbt lm; test=develop

* add dynamic ocr recognition; test=develop

* add unility.py; test=develop

* add readme; test=develop

* fix bug; test=develop

* fix bug; test=develop

* fix bug; test=develop

* fix reader CACAHE_DIR_NAME; test=develop

* fix cache dir name; test=develop

* modify .run_ce.sh

* modify .run_ce.sh

* test=develop fix error while loading cv2.VideoCapture

* test=develop
fix bug of index out of range in SampleFrames

* fix bug

* add ptb lm; test=develop

* add dynamic ocr recognition; test=develop

* fix renet bug; test=develop

* fix ocr save model; test=develop

* fix format; test=develop

* add pbt lm; test=develop

* add dynamic ocr recognition; test=develop

* add unility.py; test=develop

* add readme; test=develop

* fix bug; test=develop

* fix bug; test=develop

* fix bug; test=develop

* add cnn sentiment model for dygraph

* add pbt lm; test=develop

* add dynamic ocr recognition; test=develop

* test=develop

* Refine PE doc in dialogue_general_understanding for Windows users

* add pix2pix to gan library

* Add PaddleSlim CE

* Add log and remove counting

* Remove environment variable LD_LIBRARY_PATH

* Reduce epoch count to save time

* add tsm ce

* add tsm ce

* add enable_ce in configs

* remove enable_ce in val config

* add ce for dialogue_general_understanding

* add ce for dialogue_general_understanding

this is for issue #2232
add pretrain description in readme to show that some models need pertained models to begin training.

fix bug

implement the ptb model under dygraph mode

Because WINDOWS does not support NCCL. It will raise an error when users try to run the multi-GPUs program on WINDOWS machine. So add a note to remind users to replace parallel executor to executor.

* update _ce.py

* fix ce