code: def test_refit(self):
      # Given
      dataset_stream = io.StringIO(
          """
  ---
  type: intent
  name: my_intent
  utterances:
  - this is [entity1](my first entity)"""
      )
      dataset = Dataset.from_yaml_files("en", [dataset_stream]).json
  
      updated_dataset_stream = io.StringIO(
          """
  ---
  type: intent
  name: my_intent
  utterances:
  - this is [entity1](my first entity)
  - this is [entity1](my first entity) again"""
      )
      updated_dataset = Dataset.from_yaml_files(
          "en", [updated_dataset_stream]
      ).json
  
      config = CRFSlotFillerConfig(
          feature_factory_configs=[
              {
                  "args": {
                      "common_words_gazetteer_name": "top_10000_words_stemmed",
                      "use_stemming": True,
                      "n": 1,
                  },
                  "factory_name": "ngram",
                  "offsets": [-2, -1, 0, 1, 2],
              },
          ]
      )
  
      # When
      slot_filler = CRFSlotFiller(config).fit(dataset, "my_intent")
  
      # Then
      slot_filler.fit(updated_dataset, "my_intent")
  
imports: from __future__ import unicode_literals
  import io
  import os
  from builtins import range
  from pathlib import Path
  from unittest import skipIf
  from mock import MagicMock, PropertyMock
  from sklearn_crfsuite import CRF
  from snips_nlu.constants import DATA, END, ENTITY, LANGUAGE_EN, SLOT_NAME, START, TEXT, RANDOM_STATE
  from snips_nlu.dataset import Dataset
  from snips_nlu.entity_parser import CustomEntityParserUsage
  from snips_nlu.exceptions import NotTrained
  from snips_nlu.pipeline.configs import CRFSlotFillerConfig
  from snips_nlu.preprocessing import tokenize, Token
  from snips_nlu.result import unresolved_slot
  from snips_nlu.slot_filler.crf_slot_filler import CRFSlotFiller, _ensure_safe, _encode_tag, CRF_MODEL_FILENAME
  from snips_nlu.slot_filler.crf_utils import TaggingScheme
  from snips_nlu.slot_filler.feature_factory import IsDigitFactory, NgramFactory, ShapeNgramFactory
  from snips_nlu.tests.utils import FixtureTest, TEST_PATH
label_desc: Use image node_id 10 for calling the TestCRFSlotFiller obj's underlying member method code with example usage: obj.test_refit() without return types