code: def disconnect(self, v):
      if v in self.nn:
          self.nn.remove(v)
          v.nn.remove(self)
          self.check_min = True
          v.check_min = True
  
imports: import numpy
  import copy
label_desc: Use image node_id 4 for calling the Vertex obj's underlying member method code with example usage: obj.disconnect(v) without return types