code: def __next__(self):
      with self.lock:
          return next(self.it)
  
imports: import json
  import re
  from threading import Lock
  from typing import Any, Callable, Generator, List, Optional
  import jieba
  import torch
  import torch.distributed
  import torch.nn
  from pydantic import BaseModel, Field
label_desc: Use image node_id 3 for calling the LockedIterator obj's underlying member method code with example usage: obj.__next__() and returns: next