class_docstr: Represent a single member of population.
class_docstr_tok: ["Represent","a","single","member","of","population","."]
code: def score(self):
      if not self.result:
          raise ValueError(
              "Result must be obtained for PopulationMember to get its score."
          )
      return self.result.score
  
file_path: TextAttack/textattack/search_methods/population_based_search.py
imports: from abc import ABC, abstractmethod
  from textattack.search_methods import SearchMethod
label_desc: Use image node_id 2 for calling the PopulationMember obj's underlying member method code with example usage: obj.score() and returns: self