non-contiguous input

[yangze01]

When I set the batch size as 128, there will occurs an problem. CUDNN_STATUS_NOT_SUPPORTED. This error may appear if you passed in a non-contiguous input. When I set a smaller batch size, it goes pretty well. I think it is caused by the char embedding.

[ljshou]

@adolphk-yk it is an issue related char embedding, please take a look.