static void SegmentReductionValidationHelper(OpKernelContext* context,
                                             const Tensor& input,
                                             const Tensor& segment_ids) {
  OP_REQUIRES(context, TensorShapeUtils::IsVector(segment_ids.shape()),
              errors::InvalidArgument("segment_ids should be a vector."));
  const int64 num_indices = segment_ids.NumElements();
  OP_REQUIRES(context, num_indices == input.dim_size(0),
              errors::InvalidArgument(
                  "segment_ids should be the same size as dimension 0 of"
                  " input."));
}
static void SegmentReductionValidationHelper(OpKernelContext* context,
                                             const Tensor& input,
                                             const Tensor& segment_ids) {
  OP_REQUIRES(context, TensorShapeUtils::IsVector(segment_ids.shape()),
              errors::InvalidArgument("segment_ids should be a vector."));
  const int64 num_indices = segment_ids.NumElements();
  OP_REQUIRES(context, num_indices == input.dim_size(0),
              errors::InvalidArgument(
                  "segment_ids should be the same size as dimension 0 of"
                  " input."));
}