* 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)

add "import sys"

* add caption model ETS for PaddleVideo

* modify dynamic rnn to static rnn, and add infer past

* modify reader and configs for evaluation and validation

* modify details of the ets net code

* modify API of data and dataloader for ets net

* PaddleRec release 1.6 api update

* Update README.md

* Update README.md

bold remind of paddle version

* Update README.md

change paddle version note

* fix fluid.data and fluid.io.DataLoader

* add logger in utils/utility.py

* replace instance_norm

* add version check

* update check version

* -1->None

* fix mistake

* refine assert info in roidb_source.py

* refine image_dir assert