message: Note that quantization spec is not bit exact.
diff: ### Specification summary
  +We are providing a specification, and we can only provide some guarantees on
  +behaviour if the spec is followed. We also understand different hardware may
  +have preferences and restrictions that may cause slight deviations when
  +implementing the spec that result in implementations that are not bit-exact.
  +Whereas that may be acceptable in most cases (and we will provide a suite of
  +tests that to the best of our knowledge include per-operation tolerances that we
  +gathered from several models), the nature of machine learning (and deep learning
  +in the most common case) makes it impossible to provide any hard guarantees.
  +
  8-bit quantization approximates floating point values using the following
  formula.
  