* fix checkpoints problem.

* bert benchmark fleet support pure_fp16

* fix use_pure_fp16

add an optional boolean argument pad_rght to Pad class to support padding direction selection

fix docs for visualdl

* move coupletdataset to paddlenlp.dataset

* move coupletdataset to paddlenlp.dataset

* add doc for coupletdataset copyright, fix other api's sample code

* fix reader

* increase epoch from 100 to 200

* move coupletdataset to paddlenlp.dataset

* move coupletdataset to paddlenlp.dataset

* update docs

* add imdb dataset

* update codes

export text classification model in static graph 

fix crf bug in paddlenlp

fix the pure fp16 of argument (#5236)

add gpt2 model for the paddlenlp

* refine transformer cpu

* delete run_pretrain.sh

* update docs

* fix readme

* update doc

* add / for dir

* refine eval batch size

* support AMP training

* change the dir name

* add static step final save

* refine doc

* alter method name

* update train

* update eval

* fix doc

* fix version bug

add peoplesner, fix msraner (#5183)

fix lac bug (#5190)

* add pure fp16 training.

* Add lookup_table in custom_black_list during the pure fp16 training.

* add transformer for rc0

* predict no_grad

* add benchmark readme

* add predict for static

* update doc for fleet api

* typo

* add dygraph amp support for transformer

* according params use_amp to decide use dygraph amp

* add fleet, test=develop