std::vector<Output>* grad_outputs) {
  if (op.num_inputs() != 3) {
    return errors::InvalidArgument("UnsortedSegmentSum requires 3 arguments");
  }

  if (grad_inputs.size() != 1) {
    return errors::InvalidArgument(
        "UnsortedSegmentSum grad requires 1 grad input");
  }

  auto zero_clipped_indices = GetZeroClippedIndices(scope, op.input(1));

      "UniformRequantize",
      "Unique",
      "UniqueV2",
      "UpperBound",
      "UnsortedSegmentMax",
      "UnsortedSegmentMin",
      "UnsortedSegmentProd",
      "UnsortedSegmentSum",
      "VarIsInitializedOp",
      "VariableShape",
      "Where",
      "While",
      "XlaAllReduce",
      "XlaBroadcastHelper",
      "XlaCallModule",
      "XlaConcatND",