// supports only symmetric quantization.
          rmax = std::max(std::abs(rmin), std::abs(rmax));
          rmin = -rmax;
        }
        TensorRangeSanityCheck(op, rmin, rmax);
        mins.push_back(rmin);
        maxs.push_back(rmax);
      }
      quant_type = quantfork::fakeQuantAttrsToType(
          op.getLoc(), num_bits, *op.getAxis(), mins, maxs, narrow_range,