message: UnsortedSegmentMax uses outputs to calculate the gradients
  Fixes
diff: @@ -2889,7 +2889,6 @@ bool OpGradientDoesntRequireOutputIndices(
  {"SparseSegmentMean", {true, {}}},
  {"SparseSegmentSqrtN", {true, {}}},
  {"UnsortedSegmentSum", {true, {}}},
  - {"UnsortedSegmentMax", {true, {}}},
  {"Abs", {true, {}}},
  {"Neg", {true, {}}},
  {"ReciprocalGrad", {true, {}}},
  