exposed as eps) falls below the lower bound, then the QConfig
     will be ignored. Note that the upper bound is currently not
     enforced.

scale_exact_match and zero_point_exact_match: Exact match
     requirements for scale and zero point, to be used for operators
     with fixed quantization parameters such as sigmoid and tanh. If
     the observer specified in the QConfig is neither
     FixedQParamsObserver nor FixedQParamsFakeQuantize, or if the
     quantization parameters don't match, then the QConfig will be
     ignored.
