Created by: 1024er
Add cudnn compatiable rnn cell api for dygraph: [ 'CudnnLSTMCell', 'CudnnGRUCell' ]
Compatiable with
- cudnn rnn implementation (default)
- BasicLSTMUnit/BasicGRUUnit used by static graph currently.
User can set 'cudnn_compatibale' parameter to True/False to choose which implementation to use.