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

* fix subprocess not stopping bug

* term -> _term

* add ce for language_model

* update ce

* update ce

* fix video get learning_rate error

* refine comment