code: func Load(filename string) (*Model, error) {
  	f, err := os.Open(filename)
  	if err != nil {
  		return nil, err
  	}
  	defer f.Close()
  	model, err := FromReader(f)
  	if err != nil {
  		model = new(Model)
  		if err1 := model.convertOldFormat(filename); err1 != nil {
  			return model, err1
  		}
  		return model, nil
  	}
  	return model, nil
  }
docs: // Load a saved model from disk