code: def _get_class_labels_from_estimator(estimator):
      """
      Extracts class labels from `estimator` if `estimator.classes` is available.
      """
      return (
          estimator.classes_ if hasattr(estimator, "classes_") else None
      )
  
imports: import collections
  import inspect
  import logging
  import pkgutil
  import platform
  import warnings
  from copy import deepcopy
  from importlib import import_module
  from numbers import Number
  from operator import itemgetter
  import numpy
  from packaging.version import Version
  from mlflow import MlflowClient
  from mlflow.utils.arguments_utils import _get_arg_names
  from mlflow.utils.file_utils import TempDir
  from mlflow.utils.mlflow_tags import MLFLOW_PARENT_RUN_ID
  from mlflow.utils.time import get_current_time_millis
label_desc: Use image node_id 7 for calling a global function with example usage: _get_class_labels_from_estimator(estimator) and returns: unknown