code: def maybe_create_event_file(logdir):
      """Create an empty event file if not already exists.
  
      This event file indicates that we have a plugins/profile/ directory in the
      current logdir.
  
      Args:
        logdir: log directory.
      """
      for file_name in gfile.ListDirectory(logdir):
          if file_name.endswith(_EVENT_FILE_SUFFIX):
              return
      # TODO(b/127330388): Use summary_ops_v2.create_file_writer instead.
      event_writer = _pywrap_events_writer.EventsWriter(
          compat.as_bytes(os.path.join(logdir, "events"))
      )
      event_writer.InitWithSuffix(compat.as_bytes(_EVENT_FILE_SUFFIX))
  
imports: import datetime
  import os
  import threading
  from tensorflow.python.client import _pywrap_events_writer
  from tensorflow.python.eager import context
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.profiler.internal import _pywrap_profiler
  from tensorflow.python.util import compat
  from tensorflow.python.util.deprecation import deprecated
label_desc: Use image node_id 3 for calling a global function with example usage: maybe_create_event_file(logdir) without return types