code: def update(self, y_pred, y_true):
      pass
  
imports: import unittest
  import torch
  import torch.nn
  from poutyne import Callback, EarlyStopping, Metric, Model
  from tests.framework.base import CaptureOutputBase
  from tests.framework.tools import some_data_generator
label_desc: Use image node_id 2 for calling the EarlyStoppingDummyMetric obj's underlying member method code with example usage: obj.update(y_pred, y_true) without return types