code: def __getitem__(self, index: int) -> Tuple[Tensor, Tensor]:
      return self.features[index], self.targets[index]
  
imports: from typing import Tuple
  import pytest
  import torch
  from pytest_mock import MockerFixture
  from pytorch_lightning import Trainer
  from torch import Tensor, nn
  from torch.utils.data import DataLoader, Dataset
  from lightly.utils.benchmarking import KNNClassifier
  from lightly.utils.benchmarking.knn_classifier import F
label_desc: Use image node_id 2 for calling the _FeaturesDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self,  self