code: def __getitem__(self, idx):
      return self.x[idx], self.y[idx]
  
file_path: ogb/examples/nodeproppred/papers100M/mlp.py
imports: import argparse
  from tqdm.auto import tqdm
  import torch
  import torch.nn.functional
  from torch.utils.data import Dataset, DataLoader
  from ogb.nodeproppred import Evaluator
  from logger import Logger
label_desc: Use image node_id 3 for calling the SimpleDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self,  self