* add amp for ResNet200_vd

* change use_fp16 to use_amp

* fix script format

* change batch_size

* add amp support for model SE_ResNet50_vd

* optimize code, add model ResNet50 and SE_ResNet50_vd to list

* merge develop

* add pure fp16 training.

* update the usage of cast_parameters_to_fp16.

* use fp32 to initilize parameter values and then cast to fp16.

* enable multi_precision when training with fp16.

* add static loss scaling.

* add the rescale_grad function in the pure fp16 training.

* use cast to complete the pure fp16 training.

* use sum loss for fp16 trainging and mean loss for fp32 training.

* refine codes according reviewers' suggestions

* Calculate and print the average time for video models.

* Calculate and print the average time for dygraph of slowfast.

* Print ips for nextvlad, slowfast, tsm and tsn.

* Create inception_v3.py

* Update __init__.py

* Create InceptionV3.sh

* fix load in metric learning

* fix load in metric learning

* fix typo

* fix typo

* fix video bug and slowfast benchmark bug

* refine bmn doc

* update videotag, add fine-tune code and doc

* refine datalist

* refine eval.py

* Revert "add fuse_bn_add_act_ops args (#4864)"

* add fuse_bn_add_act_ops args

* fix ptb_dy time print for benchmark, test=develop

* use yiqun(Xreki)'s PR, test=develop

* add empty line, test=develop

* add empty line, test=develop

* fix ptb_dy time print for benchmark, test=develop

* refine resnet benchmard print, test=develop

* Add M3d-RPN model.
Co-authored-by: Nyexiaoqing <yexiaoqing@baidu.com>

test=develop

`dropout `中， `updeconv` 未被更新

* fix init

* update

* fix cgan

* Add SiamRPN and SiamMask
* delete useless code
* fix bug

* fix init

* update

* update docs

* add video tag to video
* add content to reademe
* modify link of models
* refine result format in readme
* refine readme
* add Installation to readme

* fix init

* update

* fix mistake

* fix init

* update

* update_1.8

* update paddle.reader

* update data

* test=develop update one_hot usage according to 1.8

* test=develop update dataloader api by 1.8

* test=develop fix image shape

* test=develop update save load fluid.data

* take fluid.layers.data in place of fluid.data
* delete create_var_list_v2 func
* fix usage bug of fluid.data

* take fluid.layers.data in place of fluid.data
* delete create_var_list_v2 func