// See TF_SessionRun() above.
TF_CAPI_EXPORT extern void TF_Run(TF_DeprecatedSession*,
                                  const TF_Buffer* run_options,
                                  const char** input_names, TF_Tensor** inputs,
                                  int ninputs, const char** output_names,
                                  TF_Tensor** outputs, int noutputs,

  // Retrieve the regression signature from meta graph def.
  const auto signature_def_map = metagraph_def.signature_def();
  const auto signature_def = signature_def_map.at("regress_x_to_y");

  const string input_name =
      signature_def.inputs().at(tensorflow::kRegressInputs).name();
  const string output_name =
      signature_def.outputs().at(tensorflow::kRegressOutputs).name();