code: def __init__(self, ep):
      super().__init__(ep)
      self._last_step = None
      self._last_time = None
  
imports: import time
  from guild.plugins.summary_util import SummaryPlugin
label_desc: Use image node_id 1 to create a new PerfPlugin object from inherited base classes: SummaryPlugin with example: obj = PerfPlugin(ep)