Add cross-attention cache for dygraph Transformer.
Add greedy search for dygraph Transformer.

* API update of video model
* update api and refine bmn dygraph implementation
* refine Readme and config of bmn dygraph
* fix reademe and reader
* fix details

* update api to 1.8 for transformer and similarity_net, test=develop

* update readme, test=develop

* fix init

* update

* fix

* fix models because the gradient clip strategy has been upgraded,test=develop

* fix models because the gradient clip strategy has been upgraded,test=develop

* refine code, add infer module

* update readme

* refine code

* add cpu device count

* import multiprocessing

test=develop

* fix bug: use_gpu false

* fix bug: use_gpu false

* fix bug of annotation file root

* fix bug of feature file not exists

2. Fix the leaving gen_data.sh in dygraph Transformer.

* Update README.md (#4267)

* test=develop (#4269)

* 3d use new api (#4275)

* PointNet++ and PointRCNN use new API

* Update Readme of Dygraph BERT (#4277)

Fix some typos.

* Update run_classifier_multi_gpu.sh (#4279)

remove the CUDA_VISIBLE_DEVICES

* Update README.md (#4280)

* add similarity_net dygraph

* fix similarity_net dygraph

* fix bugs of dygraph/similarity_net

* Fix some bugs running on the GPU of dygraph/similarity_net

* fix a bug in pointwise mode of dygraph/similarity_net

* fix a bug of paddleNLP/similarity_net

* fix a bug and remove unuse files of dygraph/similarity_net
Co-authored-by: Npkpk <xiyzhouang@gmail.com>
Co-authored-by: NKaipeng Deng <dengkaipeng@baidu.com>