code: def model_aggregation(self, ctx, model):
      to_send = self._process_model(model)
      agg_model = self.model_aggregator.secure_aggregate(
          ctx, to_send, self._weight
      )
      return self._recover_model(model, agg_model)
  
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 5 for calling the BaseAggregatorClient obj's underlying member method code with example usage: obj.model_aggregation(ctx, model) and returns: self