code: def _cache_fn(self, data_list: List[Data]) -> Data:
      assert len(data_list) == 1
      return data_list[0]
  
imports: import logging
  import math
  from typing import Callable, Iterator, List, NamedTuple, Optional, Tuple, Union
  import numpy
  import scipy.sparse
  import torch
  from torch import Tensor
  from tqdm import tqdm
  from torch_geometric.data import Data
  from torch_geometric.typing import SparseTensor
  from torch_geometric.utils import get_ppr, is_undirected, subgraph
label_desc: Use image node_id 3 for calling the _IBMBBaseLoader obj's underlying member method code with example usage: obj._cache_fn(data_list) and returns: data_list