* add lstm api support; test=develop

* change name from basic_api to basic_lstm; test=develop

* fix format problem; test=develop

To avoid the error when use_program_cache is True in Transformer infe…rence.

To avoid the data decode error.

* update transformer

* Update the optimization of PaddingRNN model in benchmark repo.

* Move the configuration of rnn model to a serapate file.

* Fix the error of forgetting feeding learning_rate when use py_reader.

* Add a argument and some check.

* Fix the feeding problem and remove some build options.

* Add some comments and refine the format.

* Fix an error when define the inference program.

* Remove the setting of use_experimental_executor, and simplfy some codes.

* Refine the setting of device_count.

* Update README.md

* add ACL2019-DuConv

* add ce for models_ce

* add ce for sentiment_classification

* Add an option to control whether to load ERNIE using PaddleHub

* Update README

* add ce for lexical_analysis

* add ce for lexical_analysis

* add ce for lexical_analysis

* add ce for lexical_analysis

* test=develop

* Refine PE doc in dialogue_general_understanding for Windows users

* add ce for dialogue_general_understanding

* add ce for dialogue_general_understanding

* update _ce.py

* fix ce

* add ce for language_model

* update ce

* update ce