code: def test_replace_number(self):
      data_bundle = CWSPipe(
          bigrams=True, replace_num_alpha=True, num_proc=0
      ).process_from_file(f"data_for_tests/io/cws_pku")
      for word in ["<", ">", "<NUM>"]:
          assert data_bundle.get_vocab("chars").to_index(word) != 1
  
file_path: fastNLP/tests/io/pipe/test_cws.py
imports: import pytest
  import os
  from fastNLP.io.pipe.cws import CWSPipe
label_desc: Use image node_id 2 for calling the TestRunCWSPipe obj's underlying member method code with example usage: obj.test_replace_number() without return types