onForward method
Implementation
VecVARP onForward(VecVARP inputs) {
final p = calloc<C.VecVARP_t>();
mnnRun(() => C.mnn_module_on_forward(ptr, inputs.ptr, p, ffi.nullptr));
final rval = VecVARP.fromPointer(p.value);
calloc.free(p);
return rval;
}