Status GraphDefImporter::ConvertNodeDef(OpBuilder &builder, ConversionState &s,
                                        const NodeDef &node) {
  VLOG(4) << "Importing: " << node.name();
  OperationState state(ConvertLocation(node), absl::StrCat("tfg.", node.op()));

  // The GraphImporter does light shape inference, but here we will defer all of
  // that to the shape inference pass.
  const OpDef *op_def;
  const OpRegistrationData *op_reg_data = nullptr;
  if ((op_reg_data = registry_.LookUp(node.op()))) {
    op_def = &op_reg_data->op_def;
  } else {
    auto it = function_op_defs_.find(node.op());
    if (it == function_op_defs_.end())
      return InvalidArgument("Unable to find OpDef for ", node.op());
    op_def = it->second;
  }