code: def example_val_sample(self):
      return self.example_train_sample
  
file_path: lightning-flash/tests/graph/classification/test_model.py
imports: from typing import Any
  import pytest
  import torch
  from flash import RunningStage, Trainer
  from flash.core.data.data_module import DataModule
  from flash.core.data.io.input import DataKeys
  from flash.core.utilities.imports import _TOPIC_GRAPH_AVAILABLE
  from flash.graph.classification import GraphClassifier
  from flash.graph.classification.input import GraphClassificationDatasetInput
  from flash.graph.classification.input_transform import GraphClassificationInputTransform
  from torch import Tensor
  from tests.helpers.task_tester import TaskTester
label_desc: Use image node_id 4 for calling the TestGraphClassifier obj's underlying member method code with example usage: obj.example_val_sample() and returns: self