code: def get(self, idx):
      x = torch.randn(4, 5)
      edge_index = torch.tensor([[0, 0, 0], [1, 2, 3]])
      arg = torch.randn(4, 3)
      return MyData(x, edge_index, arg)
  
file_path: pytorch_geometric/test/data/test_inherit.py
imports: import torch
  from torch_geometric.data import Data, Dataset, InMemoryDataset
label_desc: Use image node_id 5 for calling the MyDataset obj's underlying member method code with example usage: obj.get(idx) and returns: MyData