* lac dygraph for version 1.7

* lac dygraph for version 1.7

* add eval, predict and README

* remove unused links

* fix lac_dygraph download and README

* lac dygraph for version 1.7

* lac dygraph for version 1.7

* add eval, predict and README

* remove unused links

* adapte senta

* upgrade senta

* modify gru network

* fix bugs in gru and bigru net

* fix channels in cnn net

* upload dygraph seq2seq for v1.6.2

* update README

* upgrade to version 1.7

* remove unused line

remove unused line

* fix base_output dirname

* update run.sh to be the same as static graph

* update run.sh to be the same as static graph

* update Readme

* update Readme

* update README.md

change version number to 1.7

* update transformer support remove build once; test=develop

* fix optimizer; test=develop

* add new model, bmn dygraph model for video temporal proposal generation

* matching new API, decoupling model and  train module

test=develop

* Optimizer init with parameters, test=develop

* fix bug for eval, test=develop

* update ptb to support remove build once; test=develop

* update orc; test=develop

* polish code, test=develop
Co-authored-by: Nzhongpu <2013000149@qq.com>

* fix mnist multi gpu save error; test=develop

* fix inference error; test=develop

* only run inference on rankid == 0; test=develop

* fix se_resnet model for Optimizer and Linear upgrade, test=develop

* polish code style for se_resnet, test=develop

test=develop

* update build_once for cycle_gan
test=develop

* add input_channel arg
 for cycle_gan
test=develop

test=develop

test=develop

* modify senta dygraph

* modify details

* update ptb model to use auto generated op functions, test=develop

* refine model code, test=develop

* refine model code, test=develop

* update ptb model, test=develop

test=develop

test=develop

* update ptb model to use auto generated op functions, test=develop

* refine model code, test=develop

* refine model code, test=develop

* add gru and bigru net

* add gru and bigru

* add gru and bigru

* Use new save/load api and change fluid.layers.data to fluid.data (#3547)

* 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 (#3546)

* Use new save/load api in ptb_lm

* add check for paddle version

* unify reader to dataloader (#3488)

unify reader to dataloader

* Use new save/load api and change fluid.layers.data to fluid.data (#3547)

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

* add check for paddle version

* Add beam search for dygraph Transformer.
Re-organize dygraph Transformer.

* Add custumed data support for dygraph Transformer.

* Add validation in dygraph Transformer.

* Update notes for multi-gpu for dygraph Transformer.

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

* change load_dict to set_dict; test=develop

* using new load api

* merge

* add dygraph user guide in models/dygraph

* remove useless files

* fix model save

* fix doc