code: def test_sep(self):
      headers = [
          "raw_words",
          "ner",
      ]
      db = ConllLoader(headers=headers, sep="\n").load(
          "data_for_tests/io/MSRA_NER"
      )
      print(db)
  
file_path: fastNLP/tests/io/loader/test_conll_loader.py
imports: import pytest
  import os
  from fastNLP.io.loader.conll import MsraNERLoader, PeopleDailyNERLoader, WeiboNERLoader, Conll2003Loader, ConllLoader
label_desc: Use image node_id 2 for calling the TestConllLoader obj's underlying member method code with example usage: obj.test_sep() without return types