class_docstr: A special data structure needed by FonsecaHyperVolume.
  
  It consists of several doubly linked lists that share common nodes. So,
  every node has multiple predecessors and successors, one in every list.
class_docstr_tok: ["A","special","data","structure","needed","by","FonsecaHyperVolume",".","It","consists","of","several","doubly","linked","lists","that","share","common","nodes",".","So",",","every","node","has","multiple","predecessors","and","successors",",","one","in","every","list","."]
docstr: Returns the length of the i-th list.
docstr_tok: ["Returns","the","length","of","the","i-th","list","."]
code: def getLength(self, i):
      """Returns the length of the i-th list."""
      length = 0
      sentinel = self.sentinel
      node = sentinel.next[i]
      while node != sentinel:
          length += 1
          node = node.next[i]
      return length
  
file_path: deap/deap/tools/_hypervolume/pyhv.py
imports: import warnings
  import numpy
label_desc: Use image node_id 4 for calling the _MultiList obj's underlying member method code with example usage: obj.getLength(i) and returns: length