code: def example_val_sample(self):
      return self.example_train_sample
  
imports: import collections
  import json
  import os
  from typing import Any
  import numpy
  import pytest
  import torch
  from flash import Trainer
  from flash.core.data.io.input import DataKeys
  from flash.core.utilities.imports import _ICEDATA_AVAILABLE, _ICEVISION_AVAILABLE, _TOPIC_IMAGE_AVAILABLE
  from flash.image import KeypointDetectionData, KeypointDetector
  from tests.helpers.task_tester import TaskTester
label_desc: Use image node_id 4 for calling the TestKeypointDetector obj's underlying member method code with example usage: obj.example_val_sample() and returns: self