Format the elapsed time for the given TensorBoardInfo.

  Args:
    info: A TensorBoardInfo value.

  Returns:
    A human-readable string describing the time since the server
    described by `info` started: e.g., "2 days, 0:48:58".

def _time_delta_from_info(info):
  """Format the elapsed time for the given TensorBoardInfo.

  Args:
    info: A TensorBoardInfo value.

  Returns:
    A human-readable string describing the time since the server
    described by `info` started: e.g., "2 days, 0:48:58".
  """
  delta_seconds = int(time.time()) - info.start_time
  return str(datetime.timedelta(seconds=delta_seconds))