code: @Override protected boolean chunkInit(){
      if (_localmodel.get_processed_local() >= _useFraction * _fr.numRows())
        return false;
      _neurons = makeNeuronsForTraining(_localmodel);
      _dropout_rng = RandomUtils.getRNG(System.currentTimeMillis());
      return true;
    }
docs: Create local workspace (neurons) and link them to shared weights