cudnnGetRNNLinLayerMatrixParams parameter question

AI & Data Science Deep Learning (Training & Inference) cuDNN
1

Hi, I have a question about cudnnGetRNNLinLayerMatrixParams API,

cudnnStatus_t cudnnGetRNNLinLayerMatrixParams(
cudnnHandle_t                   handle,
const cudnnRNNDescriptor_t      rnnDesc,
const int                       pseudoLayer,
const cudnnTensorDescriptor_t   xDesc,
const cudnnFilterDescriptor_t   wDesc,
const void                     *w,
const int                       linLayerID,
cudnnFilterDescriptor_t         linLayerMatDesc,
void                           **linLayerMat)

what’s usage of w? I think the weights will be in linLayerMat.