class_docstr: data structure represent a vertex in the graph.
class_docstr_tok: ["data","structure","represent","a","vertex","in","the","graph","."]
code: def __init__(self):
      self.inDegrees = 0
      self.outNodes = []
  
label_desc: Use image node_id 1 to create a new GNode object from inherited base classes: object with example: obj = GNode()