code: def _currently_registered_default_experiment_provider_classes():
      return {
          provider.__class__
          for provider in mlflow.tracking.default_experiment.registry._default_experiment_provider_registry  # pylint: disable=line-too-long
      }
  
file_path: mlflow/tests/tracking/default_experiment/test_registry.py
imports: from importlib import reload
  from unittest import mock
  import pytest
  import mlflow.tracking.default_experiment.registry
  from mlflow.tracking.default_experiment.databricks_notebook_experiment_provider import DatabricksNotebookExperimentProvider
  from mlflow.tracking.default_experiment.registry import DefaultExperimentProviderRegistry, get_experiment_id
label_desc: Use image node_id 4 for calling a global function with example usage: _currently_registered_default_experiment_provider_classes() and returns: unknown