message: Disallow empty node_id_range in tf.raw_ops.BoostedTreesCalculateBestFeatureSplitV2 and tf.raw_ops.BoostedTreesCalculateBestGainsPerFeature
diff: @@ -588,8 +588,8 @@ class BoostedTreesCalculateBestFeatureSplitV2 : public OpKernel {
  "given node_id_range has shape ",
  node_id_range_t->dim_size(0), " on its first dim"));
  const auto node_id_range = node_id_range_t->vec<int32>();
  - const int32 node_id_first = node_id_range(0); // Inclusive.
  - const int32 node_id_last = node_id_range(1); // Exclusive.
  + const int32_t node_id_first = node_id_range(0); // Inclusive.
  + const int32_t node_id_last = node_id_range(1); // Exclusive.
  // Get stats_summaries_list.
  OpInputList stats_summaries_list;
  