llvm::StringRef str, flatbuffers::FlatBufferBuilder* builder) {
  return llvm::StringSwitch<tflite::ActivationFunctionType>(str)
      .Case("NONE", tflite::ActivationFunctionType_NONE)
      .Case("RELU", tflite::ActivationFunctionType_RELU)
      .Case("RELU_N1_TO_1", tflite::ActivationFunctionType_RELU_N1_TO_1)
      .Case("RELU6", tflite::ActivationFunctionType_RELU6)
      .Case("TANH", tflite::ActivationFunctionType_TANH)

  y = _tfr_quant_raw_data(x)
  s, z = _tfr_quant_qparam(x)
  s = _tfr_quant_scale_factor(1.0, [s, s])
  s = _tfr_quant_scale_factor(1.0, [s])
  y = math_ops.Sub(y, z)
  qmin, qmax = _tfr_quant_act_range('RELU', 1.0, 0)
  (qmin, qmax)  # pylint: disable=pointless-statement
  d = _tfr_quant_rescale(y, s, 0)
  e = math_ops.Cast(x=d, DstT=dtypes.int16)
  f = math_ops.Cast(x=e, DstT=dtypes.int8)
  return f