code: def validation_epoch_end(self, outputs):
      avg_val_loss = torch.stack(
          [x["val_loss"] for x in outputs]
      ).mean()
      avg_val_acc = torch.stack([x["val_acc"] for x in outputs]).mean()
      self.log("avg_val_loss", avg_val_loss)
      self.log("avg_val_acc", avg_val_acc)
  
imports: import shutil
  import tempfile
  import unittest
  import pytorch_lightning
  from ray.train import CheckpointConfig
  import torch
  from ray.air.constants import TRAINING_ITERATION
  from torch.utils.data import DataLoader, Dataset
  from ray import train, tune
  from ray.tune.integration.pytorch_lightning import TuneReportCheckpointCallback
label_desc: Use image node_id 6 for calling the _MockModule obj's underlying member method code with example usage: obj.validation_epoch_end(outputs) without return types