message: Prefix clip_by_value with underscore in gen_math_ops so that it doesn't
  interfere with clip_ops.clip_by_value when importing.
diff: @@ -98,7 +98,7 @@ bool IsOpWithUnderscorePrefix(const string& s) {
  // TODO(annarev): reduce usage of '*' imports and remove these from the
  // list.
  "fused_batch_norm", "histogram_fixed_width", "stack",
  - "batch_norm_with_global_normalization"});
  + "batch_norm_with_global_normalization", "clip_by_value"});
  return kUnderscoreOps->count(s) > 0;
  }
  