class_docstr: 数据处理函数
class_docstr_tok: ["\u6570\u636e\u5904\u7406\u51fd\u6570"]
code: def __getitem__(self, item):
      instance = self.all_data[item]
      return instance
  
file_path: DeepKE/example/llm/InstructKGC/src/finetuning_pt.py
imports: import argparse
  import os
  from shutil import copy
  import json
  import torch
  from torch.nn.utils.rnn import pad_sequence
  from torch.utils.data import Dataset, RandomSampler, DataLoader
  import deepspeed
  from transformers import AutoConfig, AutoTokenizer, AutoModel
label_desc: Use image node_id 3 for calling the Seq2SeqDataSet obj's underlying member method code with example usage: obj.__getitem__(item) and returns: instance