code: def model_aggregation(self, ctx):
      self._aggregator.model_aggregation(ctx)
  
imports: import logging
  import numpy
  import torch
  import torch.distributed
  from transformers.training_args import TrainingArguments
  from fate.ml.aggregator import AggregatorType, aggregator_map
label_desc: Use image node_id 2 for calling the AggregatorServerWrapper obj's underlying member method code with example usage: obj.model_aggregation(ctx) without return types