* add embedding example in embeddings.md

* add embedding.md link in toke_embedding readme

* fix windows url bug

* add more English embedding name

* fix doc bug

* delete useless description

* add comments of TokenEmbedding

* add embedding model info

fix url bug for word2vec

* add data.md

* backup code

* Add example for APIs.

* add readme.

* code backup.

* Modify the data.md

* fixed bug.

* Optimize the data.md

fix bugs;add more baidu embedding name

* add ernie_gen

* optimize ernie_gen

* optimize ernie_gen

* optimize ernie_gen code

* fix crf bug

* add ernie_gen __init__.py

* modify nlp version

* fix ernie_gen predict

* optimize doc

* fix translation dataset and simplify transformer reader

* add all wiki embedding and part of baidu encyclopedia embedding.

* add embedding example

* add people_daily, weibo, sougou pretrained embedding

* add zhihu, finacial,literature embedding

* Add embedding model readme; add embedding train example and readme

* fix README example

* fix embedding doc

* update transformer doc

* Update transformers.md

* Update transformers.md

* update transformer doc

* Update transformers.md

* add metric readme doc

* add "`" for APIs in doc

* Update README.md

Add "`" for APIs in doc

* Update metrics.md

* Update README.md

* update metric readme

* update lrscheduler

* minor fix

* add pre-commit

* minor fix

* Add __len__ to squad dataset

* minor fix

* Add dureader robust prototype

* dataset implement

* minor fix

* fix var name

* add dureader-yesno train script and dataset

* add readme and fix md5sum

* integrete dureader datasets

* change var names: segment to mode, root to data_file

* minor fix

* update var name

* Fix api bugs

* add dataset readme

* add express ner

* update readme format

* fix format bug

* change readme path

* fix format bug

* add paddle.models api reference docs

* update docs

* update docs

* update transformer doc

* Update transformers.md

* Update transformers.md