code: def _collect(self, ctx, suffix):
      guest_item = [ctx.guest.get(suffix)]
      host_item = ctx.hosts.get(suffix)
      combine_list = guest_item + host_item
      return combine_list
  
imports: import logging
  from typing import Optional
  import numpy
  import torch
  from fate.arch import Context
  from fate.arch.protocol.secure_aggregation._secure_aggregation import SecureAggregatorClient
  from fate.arch.protocol.secure_aggregation._secure_aggregation import SecureAggregatorServer
label_desc: Use image node_id 3 for calling the BaseAggregatorServer obj's underlying member method code with example usage: obj._collect(ctx, suffix) and returns: combine_list