code: def write_on_epoch_end(self, *_, **__):
      pass
  
file_path: pytorch-lightning/tests/tests_pytorch/callbacks/test_prediction_writer.py
imports: from unittest.mock import ANY, Mock, call
  import pytest
  from lightning.pytorch import Trainer
  from lightning.pytorch.callbacks import BasePredictionWriter
  from lightning.pytorch.demos.boring_classes import BoringModel, RandomDataset
  from lightning.pytorch.utilities.exceptions import MisconfigurationException
  from torch.utils.data import DataLoader
label_desc: Use image node_id 2 for calling the DummyPredictionWriter obj's underlying member method code with example usage: obj.write_on_epoch_end() without return types