code: def __repr__(self):
      return "%s(%.2f/%.2f=%.2f)" % (
          self.name,
          self._sum,
          self._num_inst,
          self.get(),
      )
  
imports: import logging
  import math
  from abc import ABC, abstractmethod
  from typing import Any, Dict, Optional, Tuple
  import torch
  import numpy
  from .None import constants
  from .None import utils
label_desc: Use image node_id 2 for calling the LossMetric obj's underlying member method code with example usage: obj.__repr__() and returns: unknown