message: Improve error message when users forget to pass toco cmdline args for quantization, but have a model that has FAKE_QUANT operations.
diff: @@ -300,6 +300,17 @@ void Export(const Model& model, bool allow_custom_ops,
  std::set<string> error_summary;
  auto op_codes = ExportOperatorCodes(model, ops_by_type, operators_map,
  &builder, &error_summary);
  + const string fake_quant_operation_name = "FAKE_QUANT";
  + if (error_summary.count(fake_quant_operation_name) != 0) {
  + LOG(ERROR)
  + << fake_quant_operation_name
  + << " operation was not converted. If running quantized make sure you "
  + "are passing --inference_type=QUANTIZED_UINT8 and values for "
  + "--std_values and --mean_values.";
  + // Remove the fake quant operation from the errors, since it shouldn't
  + // be provided a custom implementation.
  + error_summary.erase(fake_quant_operation_name);
  + }
  if (!allow_custom_ops && !error_summary.empty()) {
  LOG(QFATAL) << "Some of the operators in the model are not supported by "
  "the standard TensorFlow Lite runtime. If you have a custom "
  