class_docstr: Visitor to determine if a node is ready to run.
class_docstr_tok: ["Visitor","to","determine","if","a","node","is","ready","to","run","."]
code: def __init__(self):
      self._visited_operation_def_labels = set()
  
imports: import collections
  import dataclasses
  from typing import Sequence
  from tensorflow_transform import analyzer_nodes
  from tensorflow_transform import nodes
  from tensorflow_transform.beam import beam_nodes
label_desc: Use image node_id 1 to create a new _ValidationVisitor object from inherited base classes: nodes with example: obj = _ValidationVisitor()