* update pretrain demo

* modeul path fix for ernie-gen

* dygraph distributed cls + init_checkpoint option

* update seq2seq readme

* update readme

* Update README.zh.md

* Update setup.py

* reorganize seq2seq

* update lac dependency

* fix #466

* NER demo: avoid memory error (issue #466)
very ugly; need to improve later

* chunkf1

* fix #476

* update readme

* fix readme

* Update README.md

* fix grad_clip

* fix distill

* up distill

* upgrade version no

* seq2seq + length penalty

* upgrade to paddle 1.8

* fix readme

* update seq2seq to 1.8

* fix seq2seq beam-search

* + aisudio tutorial: loading old-styled checkpoint

* add mising seq2seq eval file for cnndm

* fix seq2seq decode post process

* + handlers

* update readme

* update demo

* + 160G model

* qa model bugfix: models inherits docstrings

* Update README.zh.md

* Update README.en.md

* Update README.zh.md

* reorganize binaries

* Update README.zh.md

* Update README.en.md

* Update README.zh.md

* Update README.en.md

* fix pretrain reader  encoding

* dygraph

* update bce

* fix readme

* update readme

* fix readme

* remove debug log

* remove chn example

* fix pretrain

* tokenizer can escape special token
rename mlm_bias

* update readme

* 1. MRC tasks
2. optimize truncate strategy in tokenzier
3. rename `ernie.cls_fc` to `ernie.classifyer`
4. reorg pretrain dir

* + doc string

* update readme

* Update README.md

* Update README.md

* Update README.md

* update pretrain

* Update README.md

* show gif

* update readme

* fix gif; disable save_dygrpah

* bugfix

* + save inf model
+ inference
+ distill
+ readme

* Update README.md

* + propeller server

* Update README.md

* Update README.md

* Update README.md

* + sementic analysis(another text classification)

* transformer + cache
fix tokenization bug

* update reamde; fix tokenization

* Update README.md

* Update README.md

* Add files via upload

* Update README.md

* Update README.md

* Update README.md

* infer senti analysis

* + readme header

* transformer cache has gradients

* + seq2seq

* +experimental

* reorg

* update readme

* Update README.md

* seq2seq

* + cnndm evluation scripts

* update README.md

* +zh readme

* + publish ernie gen model

* update README.md

* Update README.zh.md

* Update README.md

* Update README.zh.md

* Update README.md

* Update README.zh.md

* Update README.md

* Update README.zh.md

* Update README.md

* Update README.zh.md

* Update README.zh.md

* Add files via upload

* Update README.md

* Update README.zh.md

* Add files via upload

* release ernie-gen (#444)

* release ernie-gen

* add .meta

* del tag

* fix tag

* Add files via upload

* Update README.zh.md

* Update README.md

* Update and rename README.zh.md to README.eng.md

* Update README.eng.md

* Update README.md

* Update README.eng.md

* Update README.md

* Update README.eng.md

* Update README.md

* Update README.md

* Update README.md

* Update README.eng.md

* Update README.eng.md

* Update README.eng.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md
Co-authored-by: Nkirayummy <shi.k.feng@gmail.com>
Co-authored-by: Nzhanghan <zhanghan17@baidu.com>