static StringRef GetGradientAttrName() { return "tf.gradient"; }

  // This attribute marks if a function is stateful.
  // Returns the string description of stateful attribute.
  static StringRef GetStatefulAttrName() { return "tf.signature.is_stateful"; }

  // Returns true if the op can be duplicated during transformations.
  static bool CanDuplicate(Operation *op);

  // Returns true if the op can have side effects.