code: def get_client(pid, frontend_addr):
      if pid not in InferenceClientProxy.clients.keys():
          client = InferenceClient(frontend_addr)
          InferenceClientProxy.clients.update({pid: client})
      return InferenceClientProxy.clients[pid]
  
file_path: PaddleHub/paddlehub/serving/client.py
imports: import zmq
label_desc: Use image node_id 1 for calling the InferenceClientProxy obj's underlying member method code with example usage: obj.get_client(pid, frontend_addr) and returns: InferenceClientProxy