code: func (t *Trainer) Lemmatize(a string, pt lingo.POSTag) ([]string, error) {
  	if t.l == nil {
  		return nil, componentUnavailable("Lemmatizer")
  	}
  	return t.l.Lemmatize(a, pt)
  }
docs: // Lemmatize implemnets lingo.Lemmatizer