code: def on_validation_epoch_end(self) -> None:
      return
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  import numpy
  import pytest
  import optuna
  from optuna._imports import try_import
  from optuna.integration import PyTorchLightningPruningCallback
  from optuna.testing.pruners import DeterministicPruner
  from optuna.testing.storages import StorageSupplier
label_desc: Use image node_id 3 for calling the ModelDDP obj's underlying member method code with example usage: obj.on_validation_epoch_end() without return types