code: def append(self, req):
      self.waiting_req_list.append(req)
      return
  
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 2 for calling the ReqQueue obj's underlying member method code with example usage: obj.append(req) without return types