code: def __getitem__(self, idx):
      return {
          "feature": torch.tensor(self.features[idx]),
          "annotation": torch.tensor(self.annotations[idx]),
          "test": torch.tensor(self.features[idx]),
      }
  
imports: import functools
  import os
  import unittest
  from unittest.mock import MagicMock
  import torch
  from mmf.datasets.base_dataset import BaseDataset
  from mmf.datasets.mmf_dataset_builder import MMFDatasetBuilder
  from mmf.utils.general import get_current_device
  from omegaconf import OmegaConf
label_desc: Use image node_id 2 for calling the SimpleMMFDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: dict