pub unsafe extern "C" fn cudnnGetConvolutionBackwardFilterWorkspaceSize(
handle: *mut cudnnContext,
xDesc: *mut cudnnTensorStruct,
dyDesc: *mut cudnnTensorStruct,
convDesc: *mut cudnnConvolutionStruct,
gradDesc: *mut cudnnFilterStruct,
algo: cudnnConvolutionBwdFilterAlgo_t,
sizeInBytes: *mut usize
) -> cudnnStatus_t