docstr: Check whether this vertex is strictly less than all its neighbors
docstr_tok: ["Check","whether","this","vertex","is","strictly","less","than","all","its","neighbors"]
code: def minimiser(self):
      """Check whether this vertex is strictly less than all its neighbors"""
      if self.check_min:
          self._min = all(self.f < v.f for v in self.nn)
          self.check_min = False
  
      return self._min
  
imports: import numpy
  import copy
label_desc: Use image node_id 5 for calling the Vertex obj's underlying member method code with example usage: obj.minimiser() and returns: self