code: def process_events(self) -> Tensor:
      raise NotImplementedError
  
imports: from typing import Callable, List, Optional
  import torch
  from torch import Tensor
  from torch_geometric.data import Data, InMemoryDataset, download_url
  from torch_geometric.io import read_txt_array
label_desc: Use image node_id 4 for calling the EventDataset obj's underlying member method code with example usage: obj.process_events() without return types