code: def has_event_storage():
      """
      Returns:
          Check if there are EventStorage() context existed.
      """
      return len(_CURRENT_STORAGE_STACK) > 0
  
imports: import datetime
  import json
  import logging
  import os
  import time
  from collections import defaultdict
  from contextlib import contextmanager
  from functools import cached_property
  from typing import Optional
  import torch
  from fvcore.common.history_buffer import HistoryBuffer
  from detectron2.utils.file_io import PathManager
label_desc: Use image node_id 2 for calling a global function with example usage: has_event_storage() and returns: unknown