class_docstr: A timer that tracks a duration since creation.
class_docstr_tok: ["A","timer","that","tracks","a","duration","since","creation","."]
code: def secs_remaining(self):
      diff = self._duration_secs - (time.time() - self._start_time_secs)
      return max(0, diff)
  
imports: import time
  from typing import Optional, Tuple
  import numpy
  from tensorflow.python.checkpoint import checkpoint_management
  from tensorflow.python.client import session
  from tensorflow.python.distribute import distribute_lib
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import saver
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 2 for calling the _CountDownTimer obj's underlying member method code with example usage: obj.secs_remaining() and returns: max