code: def valid_modes():
      """Returns a set of possible values of mode."""
      return {
          tf.estimator.ModeKeys.TRAIN,
          tf.estimator.ModeKeys.EVAL,
          tf.estimator.ModeKeys.PREDICT,
      }
  
imports: import tensorflow
label_desc: Use image node_id 5 for calling a global function with example usage: valid_modes() and returns: unknown