pub unsafe extern "C" fn cudnnRNNBackwardDataEx(
handle: *mut cudnnContext,
rnnDesc: *mut cudnnRNNStruct,
yDesc: *mut cudnnRNNDataStruct,
y: *const c_void,
dyDesc: *mut cudnnRNNDataStruct,
dy: *const c_void,
dcDesc: *mut cudnnRNNDataStruct,
dcAttn: *const c_void,
dhyDesc: *mut cudnnTensorStruct,
dhy: *const c_void,
dcyDesc: *mut cudnnTensorStruct,
dcy: *const c_void,
wDesc: *mut cudnnFilterStruct,
w: *const c_void,
hxDesc: *mut cudnnTensorStruct,
hx: *const c_void,
cxDesc: *mut cudnnTensorStruct,
cx: *const c_void,
dxDesc: *mut cudnnRNNDataStruct,
dx: *mut c_void,
dhxDesc: *mut cudnnTensorStruct,
dhx: *mut c_void,
dcxDesc: *mut cudnnTensorStruct,
dcx: *mut c_void,
dkDesc: *mut cudnnRNNDataStruct,
dkeys: *mut c_void,
workSpace: *mut c_void,
workSpaceSizeInBytes: usize,
reserveSpace: *mut c_void,
reserveSpaceSizeInBytes: usize
) -> cudnnStatus_t