code: def test_translate_nn(self):
      # Test the nearest neighbor retrieval method
      model = translation_matrix.TranslationMatrix(
          self.source_word_vec, self.target_word_vec, self.word_pairs
      )
      model.train(self.word_pairs)
  
      test_source_word, test_target_word = zip(*self.test_word_pairs)
      translated_words = model.translate(
          test_source_word,
          topn=5,
          source_lang_vec=self.source_word_vec,
          target_lang_vec=self.target_word_vec,
      )
  
      for idx, item in enumerate(self.test_word_pairs):
          self.assertTrue(item[1] in translated_words[item[0]])
  
imports: from collections import namedtuple
  import unittest
  import logging
  import numpy
  import pytest
  from scipy.spatial.distance import cosine
  from gensim.models.doc2vec import Doc2Vec
  from gensim import utils
  from gensim.models import translation_matrix
  from gensim.models import KeyedVectors
  from gensim.test.utils import datapath, get_tmpfile
label_desc: Use image node_id 4 for calling the TestTranslationMatrix obj's underlying member method code with example usage: obj.test_translate_nn() without return types