code: def _set_last(self, val, step):
      if self.last_step is None or step >= self.last_step:
          self.last_val = val
          self.last_step = step
  
imports: import logging
  import os
  import sqlite3
  from guild import run_util
  from guild import tfevent
  from guild import util
  from guild import var
label_desc: Use image node_id 4 for calling the TagSummary obj's underlying member method code with example usage: obj._set_last(val, step) without return types