code: @Override protected void closeLocal() {
      if (_localmodel.get_params()._elastic_averaging) {
        // store local model, as it will be reduced in the following, and hence averaged with other models
        DKV.put(_localmodel.localModelInfoKey(H2O.SELF), _localmodel, _fs);
      }
      _sharedmodel = null; //avoid serialization overhead
    }
docs: After all maps are done on a node, this is called to store the per-node model into DKV (for elastic averaging)
  Otherwise, do nothing.