code: def reset(self, state):
      super(TimerMetric, self).reset(state)
      if not self.added_callback:
          state[torchbearer.CALLBACK_LIST].append([self])
          self.added_callback = True
  
imports: from __future__ import print_function
  import sys
  import time
  from torchbearer.callbacks import Callback
  import torchbearer
  from torchbearer.metrics import Metric
label_desc: Use image node_id 4 for calling the TimerMetric obj's underlying member method code with example usage: obj.reset(state) without return types