class_docstr: A callback for recording GPU power draw (watts) on epoch begin and end.
  
  Example use:
  
  power_draw = PowerDraw()
  
  model.fit(...callbacks=[power_draw]...)
  
  history = talos.utils.power_draw_append(history, power_draw)
code: def on_epoch_end(self, batch, logs=None):
      temp = self.os.popen(self.command).read()
      temp = float(temp.strip())
      self.log["epoch_end"].append(temp)
      seconds = round(self.time() - self.epoch_start_time, 3)
      self.log["seconds"].append(seconds)
  
imports: from tensorflow.keras.callbacks import Callback
label_desc: Use image node_id 4 for calling the PowerDraw obj's underlying member method code with example usage: obj.on_epoch_end(batch, logs) without return types