code: def is_tracking_uri_set():
      """Returns True if the tracking URI has been set, False otherwise."""
      if _tracking_uri or MLFLOW_TRACKING_URI.get():
          return True
      return False
  
imports: import logging
  import os
  from contextlib import contextmanager
  from functools import partial
  from pathlib import Path
  from typing import Union
  from mlflow.environment_variables import MLFLOW_TRACKING_AUTH, MLFLOW_TRACKING_AWS_SIGV4, MLFLOW_TRACKING_CLIENT_CERT_PATH, MLFLOW_TRACKING_INSECURE_TLS, MLFLOW_TRACKING_SERVER_CERT_PATH, MLFLOW_TRACKING_TOKEN, MLFLOW_TRACKING_URI
  from mlflow.store.db.db_types import DATABASE_ENGINES
  from mlflow.store.tracking import DEFAULT_LOCAL_FILE_AND_ARTIFACT_PATH
  from mlflow.store.tracking.file_store import FileStore
  from mlflow.store.tracking.rest_store import RestStore
  from mlflow.tracking._tracking_service.registry import TrackingStoreRegistry
  from mlflow.utils import rest_utils
  from mlflow.utils.credentials import read_mlflow_creds
  from mlflow.utils.databricks_utils import get_databricks_host_creds
  from mlflow.utils.file_utils import path_to_local_file_uri
  from mlflow.utils.uri import _DATABRICKS_UNITY_CATALOG_SCHEME
label_desc: Use image node_id 1 for calling a global function with example usage: is_tracking_uri_set() and returns: False, True