code: def __init__(self, name):
      super(_TimerMetric, self).__init__(name)
      self.t = time.time()
  
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 1 to create a new _TimerMetric object from inherited base classes: Metric with example: obj = _TimerMetric(name)