* update new fluid.data and data_loader interface and add check_version

* update for paddle 1.6

* update optimize op in paddle 1.6

* fix ernie based in paddle 1.6

* fix coding for windows

* emotion-detection => 1.6

* ERNIE => 1.6

* [PaddleNLP] update emotion_detection readme

* [PaddleNLP] emotion_detection add download.py for windows user

* modify PaddleRec readme

* fix_dgu_ade_dnet

* fix_readme

* refine download sh to py

* update QUICK_STARTED

* refine yolov3/rcnn/ssd dataset download

* refine docs

* update api in PaddleRec, test=release/1.6

* fix encoding, os.path.join, test=release/1.6

* fix encoding, os.path.join, test=release/1.6

* Update Transformer using Paddle-1.6 apis.

* Add check_version for Paddle-1.6 and reorganize utils including check, configuration, etc.

* add quick download link of bos in README.

* remove actual_shape

* change version to 1.5 in yolov3

* Use new save/load api and change fluid.layers.data to fluid.data

* add check for paddle version

* Use new save/load api in ptb_lm

* add check for paddle version

* Remove KD scripts

* Add ERNIE2.0 service

* Update server

* Update MTL

* Update README.md

* Update README.md for MTL

* Update README.md

* upgrade_dmtk_name

cherry-pick the readme from develop

Those images are for the new readme of PaddleNLP.

* emotion-detection => 1.6

* ERNIE => 1.6

* [PaddleNLP] update emotion_detection readme

* unify reader to dataloader

* add check_version

* Update README.md

* padding ernie

* modify ernie

* modify code style

* remove squeeze_labels

* fix lod/ernie input_mask dtype

* padding LAC/ERNIE revert squeeze

* padding LAC/ERNIE revert label shape

* padding LAC/ERNIE add padded_token_embeddings

* doc add eval&infer usage

* doc fix

* Upgrade bert to 1.6 api

* Use inplace for reshape

* Remove KD scripts

* Add ERNIE2.0 service

* Update server

* Update MTL

* Update README.md

* Update README.md for MTL

* Update README.md

1. Change layers.data to fluid.data
2. Add check_version in ocr model

cherry-pick add aistudio link in README #3568 (#3585)