pub unsafe extern "C" fn cudnnGetConvolutionBackwardFilterWorkspaceSize(
handle: cudnnHandle_t,
xDesc: cudnnTensorDescriptor_t,
dyDesc: cudnnTensorDescriptor_t,
convDesc: cudnnConvolutionDescriptor_t,
gradDesc: cudnnFilterDescriptor_t,
algo: cudnnConvolutionBwdFilterAlgo_t,
sizeInBytes: *mut usize
) -> cudnnStatus_t