requantize_from_int Class — pytorch Architecture

Source Code

aten/src/ATen/native/quantized/AffineQuantizerBase.cpp lines 204–213

template <typename DST_T>
DST_T requantize_from_int(double multiplier, int64_t zero_point, int64_t src) {
  int64_t quantize_down =
      zero_point + lrintf(static_cast<float>(static_cast<double>(src) * multiplier));
  // NOLINTNEXTLINE(bugprone-signed-char-misuse)
  int32_t min = std::numeric_limits<typename DST_T::underlying>::min();
  int32_t max = std::numeric_limits<typename DST_T::underlying>::max();
  return static_cast<DST_T>(
      std::min<int64_t>(std::max<int64_t>(quantize_down, min), max));
}