code: def update(self, pred: str, target: str):
      if pred == target:
          self.correct += 1
      self.total += 1
  
imports: import logging
  import re
  import string
  from collections import Counter
  from typing import List, Union
  import torch
  from torchmetrics import Metric
label_desc: Use image node_id 2 for calling the ExactStringMatchMetric obj's underlying member method code with example usage: obj.update(pred, target) without return types