code: def test_numericalize_1(self):
      mf = MatchingField(id=True)
      arr = [[1], [2], [3]]
      mf.numericalize(arr)
      self.assertEqual(arr, [[1], [2], [3]])
  
imports: import os
  import shutil
  import unittest
  from collections import Counter
  from test import test_dir_path
  from nose.tools import *
  import torch
  from deepmatcher.data.dataset import MatchingDataset
  from deepmatcher.data.field import FastText, FastTextBinary, MatchingField, MatchingVocab, reset_vector_cache
  from torchtext.vocab import Vectors
  from urllib.parse import urljoin
  from urllib.request import pathname2url
label_desc: Use image node_id 9 for calling the ClassMatchingFieldTestCases obj's underlying member method code with example usage: obj.test_numericalize_1() without return types