Dequantize

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num_discrete_values = 1 << (# of bits in T)
 range_adjust = num_discrete_values / (num_discrete_values - 1)
 range = (range_max - range_min) * range_adjust
 range_scale = range / num_discrete_values
 const double offset_input = static_cast<double>(input) - lowest_quantized;
 result = range_min + ((input - numeric_limits<T>::min()) * range_scale)
 

const int min_expected_T = std::numeric_limits<T>::min() +
     (narrow_range ? 1 : 0);
   const int max_expected_T = std::numeric_limits<T>::max();
   const float max_expected_T = std::numeric_limits<float>::max();
 
   const float scale_factor =
     (std::numeric_limits<T>::min() == 0) ? (max_range / max_expected_T)
                                          : std::max(min_range / min_expected_T,
                                                     max_range / max_expected_T);