code: def __len__(self):
      return self.waiting_req_list.__len__()
  
file_path: ColossalAI/colossalai/legacy/inference/dynamic_batching/req_queue.py
imports: import uuid
  from typing import List
  import numpy
  from .io_struct import Batch, Req
label_desc: Use image node_id 6 for calling the ReqQueue obj's underlying member method code with example usage: obj.__len__() and returns: self