code: def __init__(self):
      self.first_val = None
      self.first_step = None
      self.last_val = None
      self.last_step = None
      self.min_val = None
      self.min_step = None
      self.max_val = None
      self.max_step = None
      self.avg_val = None
      self.total = 0
      self.count = 0
  
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 1 to create a new TagSummary object  with example: obj = TagSummary()