code: def _get_event_file_active_filter(flags):
      """Returns a predicate for whether an event file load timestamp is active.
  
      Returns:
        A predicate function accepting a single UNIX timestamp float argument, or
        None if multi-file loading is not enabled.
      """
      if not flags.reload_multifile:
          return None
      inactive_secs = flags.reload_multifile_inactive_secs
      if inactive_secs == 0:
          return None
      if inactive_secs < 0:
          return lambda timestamp: True
      return lambda timestamp: timestamp + inactive_secs >= time.time()
  
imports: import os
  import re
  import threading
  import time
  from tensorboard.backend.event_processing import data_provider
  from tensorboard.backend.event_processing import plugin_event_multiplexer
  from tensorboard.backend.event_processing import tag_types
  from tensorboard.compat import tf
  from tensorboard.data import ingester
  from tensorboard.plugins.audio import metadata
  from tensorboard.plugins.histogram import metadata
  from tensorboard.plugins.image import metadata
  from tensorboard.plugins.pr_curve import metadata
  from tensorboard.plugins.scalar import metadata
  from tensorboard.util import tb_logging
label_desc: Use image node_id 1 for calling a global function with example usage: _get_event_file_active_filter(flags) and returns: function, None, None, function