* 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

* Add an Introduction for providing computing resources in readme.md

this word is wrong

* fix video train param name epoch.

* fix for script.

* fix bugs and add python3 supports
* minor changes
* Fix misleading description in README