code: def test_fail_to_load_non_existent_featurizer():
      assert TrackerFeaturizer.load("non_existent_class") is None
  
imports: from typing import Text, Dict, List, Optional
  import numpy
  import pytest
  from rasa.core.featurizers.single_state_featurizer import SingleStateFeaturizer
  from rasa.core.featurizers.single_state_featurizer import IntentTokenizerSingleStateFeaturizer
  from rasa.core.featurizers.tracker_featurizers import TrackerFeaturizer
  from rasa.core.featurizers.tracker_featurizers import MaxHistoryTrackerFeaturizer
  from rasa.core.featurizers.tracker_featurizers import IntentMaxHistoryTrackerFeaturizer
  from rasa.core.featurizers.tracker_featurizers import FullDialogueTrackerFeaturizer
  from rasa.shared.core.domain import Domain
  from tests.core.utilities import user_uttered
  from rasa.shared.nlu.training_data.features import Features
  from rasa.shared.nlu.constants import INTENT, ACTION_NAME
  from rasa.shared.core.constants import ACTION_LISTEN_NAME, ACTION_UNLIKELY_INTENT_NAME, USER, PREVIOUS_ACTION
  from rasa.shared.core.events import ActionExecuted
  from rasa.shared.core.trackers import DialogueStateTracker
  from rasa.utils.tensorflow.constants import LABEL_PAD_ID
  from rasa.utils.tensorflow.model_data import ragged_array_to_ndarray
  from rasa.core.exceptions import InvalidTrackerFeaturizerUsageError
label_desc: Use image node_id 1 for calling a global function with example usage: test_fail_to_load_non_existent_featurizer() without return types