code: func NewPunktSentenceTokenizer() *PunktSentenceTokenizer {
  	var pt PunktSentenceTokenizer
  	var err error
  
  	pt.tokenizer, err = newSentenceTokenizer(nil)
  	util.CheckError(err)
  
  	return &pt
  }
docs: // NewPunktSentenceTokenizer creates a new PunktSentenceTokenizer and loads
  // its English model.