Function IsPrimitiveOpWithNoGrad

tensorflow/core/graph/gradients.cc:330–334

}

static bool IsPrimitiveOpWithNoGrad(const string& func) {
  gradient::Creator creator;
  Status s = gradient::GetOpGradientCreator(func, &creator);
  return s.ok() && (creator == nullptr);
}

Status SymbolicGradientBuilder::Compute() {
  // Initialize backprops.