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

* fix fluid.data and fluid.io.DataLoader

* add logger in utils/utility.py

Add version checking for DIN and SR-GNN.

* Add face detection configs and main code.
* Integration multi-scale evaluation.

* unify reader to dataloader

* add check_version

* fix some configs

* fix doc

* change PyReader to from_generator

* fluid.layers.data->fluid.data

* fix_bug

* user new save load in all dygraph modell; test=develop

* change load_dict to set_dict; test=develop

* add_multiprocess_train_to_image_classification