message: change input params as const
diff: @@ -1178,9 +1178,9 @@ namespace {
  // (projection matrix) will be fetched to the 'weights'. Otherwise, nothing will
  // be done.
  port::Status CheckAndFetchProjectionWeights(
  - const CudnnHandle& cudnn, cudnnRNNDescriptor_t rnn_desc, int layer,
  - TensorDescriptor& input_desc, FilterDescriptor& filter_desc,
  - FilterDescriptor& region_desc_handle,
  + const CudnnHandle& cudnn, cudnnRNNDescriptor_t rnn_desc, const int layer,
  + const TensorDescriptor& input_desc, const FilterDescriptor& filter_desc,
  + const FilterDescriptor& region_desc_handle,
  dnn::RnnDescriptor::ParamsRegions* weights) {
  #if CUDNN_VERSION >= 7101
  int hidden_size_v;
  