const std::vector<int>& tensors = lstm_property.restrict_scale[0];
    if (tensors.size() != 2) {
      op.emitError(
          "Unexpected restricted_scale from operator property."
          " Should only have a pair of indices.");
      return failure();
    }
    return processRestrictScale(op, tensors[0], tensors[1], rewriter);
  }

 private:

  // it is disabled explicitly.
  bool infer_tensor_range =
      (quant_specs_.post_training_quantization || eager_quantize) &&
      !quant_specs_.disable_infer_tensor_range;

  // LSTM's restrict_scale requirement should be handled before converting stats
  // to Q-DQ ops. The pattern is applied for non-PTQ case to make op ordering
  // consistent. Otherwise some FileCheck tests would fail.