// the location.
  mlir::Location GetLocation(const Node& node);

  // Appends the location string for the node to the error message and returns
  // the combined error status.
  Status EmitErrorWithLocationStr(const Node& node, const Status& error_status);

  // Inserts a placeholder node in the graph to replace a feed output tensor,
  // and returns the new placeholder node and a boolean indicating if the