code: def evaluate(self):
      if self.args.evaluation_type == "retrieval":
          return self.evaluate_retrieval()
      elif self.args.evaluation_type == "e2e":
          return self.evaluate_e2e()
      else:
          raise ValueError(
              f"evaluation_type must be either 'retrieval' or 'e2e'"
          )
  
imports: import ast
  from collections import defaultdict
  from typing import List
  import nltk
  import pandas
  from nltk import word_tokenize
  from nltk.translate.bleu_score import sentence_bleu
  from nltk.translate.meteor_score import meteor_score
  from rouge_score import rouge_scorer
  from scipy.spatial import distance
  from mindsdb.integrations.handlers.writer_handler.settings import WriterHandlerParameters
  from mindsdb.utilities import log
label_desc: Use image node_id 24 for calling the WriterEvaluator obj's underlying member method code with example usage: obj.evaluate() and returns: self, self