message: fix py_aggregator memory leak
diff: @@ -46,6 +46,8 @@ class Aggregator(AggregatorABC):
  )
  ]
  self.global_weights = np.sum(scaled_model_weights, axis=0)
  + self.weights = []
  + self.aggregation_data = []
  LOG.info("finished aggregation")
  return self.get_global_weights()
  