Function SumGrad

tensorflow/cc/gradients/math_grad.cc:731–739

}

Status SumGrad(const Scope& scope, const Operation& op,
               const std::vector<Output>& grad_inputs,
               std::vector<Output>* grad_outputs) {
  grad_outputs->push_back(SumGradHelper(scope, op, grad_inputs));

  // Stop propagation along reduction_indices
  grad_outputs->push_back(NoGradient());
  return scope.status();
}
REGISTER_GRADIENT_OP("Sum", SumGrad);

Status MeanGrad(const Scope& scope, const Operation& op,