code: def _get_first_event_timestamp(self, run_name):
      try:
          return self._multiplexer.FirstEventTimestamp(run_name)
      except ValueError as e:
          return None
  
imports: import base64
  import collections
  import json
  import random
  from tensorboard import errors
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.data import provider
  from tensorboard.util import tb_logging
  from tensorboard.util import tensor_util
label_desc: Use image node_id 7 for calling the MultiplexerDataProvider obj's underlying member method code with example usage: obj._get_first_event_timestamp(run_name) and returns: self, None