code: def __getitem__(self, idx):
      return (
          self.chosen[idx]["input_ids"],
          self.chosen[idx]["attention_mask"],
          self.reject[idx]["input_ids"],
          self.reject[idx]["attention_mask"],
      )
  
imports: import copy
  import json
  from typing import Dict, Sequence
  import torch
  from torch.utils.data import Dataset
  from tqdm import tqdm
  from transformers import AutoTokenizer
label_desc: Use image node_id 3 for calling the EasyRewardDataset obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: self,  self,  self,  self