code: def __getitem__(self, index):
      return Batch(
          pos=self._pos, x=self._feature, y=self._y, batch=self._batch
      )
  
file_path: torch-points3d/test/test_resolver.py
imports: import unittest
  from omegaconf import OmegaConf
  import torch
  from torch.utils.data import Dataset
  from torch_geometric.data import Batch
  import os
  import sys
  from torch_points3d.utils.model_building_utils.model_definition_resolver import resolve_model
label_desc: Use image node_id 2 for calling the MockDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: Batch