message: More explicit TOCO error message when the input graph is missing min/max needed
  for quantization.
diff: @@ -1619,11 +1619,12 @@ void CheckIsReadyForQuantization(const Model& model) {
  << "Array " << input << ", which is an input to the "
  << HelpfulOperatorTypeName(*op) << " operator producing the output "
  << "array " << op->outputs[0] << ", is lacking min/max data, "
  - << "which is necessary for quantization. Either target a "
  - << "non-quantized output format, or change the input graph to "
  - << "contain min/max information, or pass --default_ranges_min= and "
  - << "--default_ranges_max= if you do not care about the accuracy of "
  - << "results.";
  + << "which is necessary for quantization. If accuracy matters, either "
  + << "target a non-quantized output format, or run quantized training "
  + << "with your model from a floating point checkpoint to change the "
  + << "input graph to contain min/max information. If you don't care "
  + << "about accuracy, you can pass --default_ranges_min= and "
  + << "--default_ranges_max= for easy experimentation.";
  }
  }
  }
  