class_docstr: Base class for a vertex.
class_docstr_tok: ["Base","class","for","a","vertex","."]
code: def connect(self, v):
      raise NotImplementedError(
          "This method is only implemented with an "
          "associated child of the base class."
      )
  
imports: import collections
  from abc import ABC, abstractmethod
  import numpy
  from scipy._lib._util import MapWrapper
label_desc: Use image node_id 4 for calling the VertexBase obj's underlying member method code with example usage: obj.connect(v) without return types