* update PaddleNLP  lexical_analysis for Release/1.6 (#3664)

* update for paddle 1.6

* update optimize op in paddle 1.6

* fix ernie based in paddle 1.6

* fix coding for windows

* update downloads.py (#3672)

* Fix infer bug on Release/1.6  

* fix bug on ernie based inferring

* replace open with io.open to be compatible with windows (#3707)

* update README.md

* reconstruct the run_sequence_labeling.py into train.py predict.py eval.py & add yalm configure

* reconstruct the ERNIE based LAC model

* Update train_ernie.py

recurrent multi-GPU nan

* update the ernie base model

* configure update

* update configure

* add inference model

* specification code

* delete unused run_sequence_labeling.py

* rename evaluate.py to compare.py

* add postfix '.pdckpt' to model

* update README.md

* add LAC class(for predict conveniently)

* add LAC class(for predict conveniently)

* update README.md

* fixed bug on run_ernie

* update default setting

* fix infenence bug in windows

* fix infenence bug in windows

* update new model and dateset

* delete the postfix .pdckpt of model checkpoint directory

* update new model's performance

* fixed the bug for empty input

* unusing of tqdm tools

* fix the bug of train_data