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;;; ;;
;;; Centre for Speech Technology Research ;;
;;; University of Edinburgh, UK ;;
;;; Copyright (c) 1996,1997 ;;
;;; All Rights Reserved. ;;
;;; ;;
;;; Permission is hereby granted, free of charge, to use and distribute ;;
;;; this software and its documentation without restriction, including ;;
;;; without limitation the rights to use, copy, modify, merge, publish, ;;
;;; distribute, sublicense, and/or sell copies of this work, and to ;;
;;; permit persons to whom this work is furnished to do so, subject to ;;
;;; the following conditions: ;;
;;; 1. The code must retain the above copyright notice, this list of ;;
;;; conditions and the following disclaimer. ;;
;;; 2. Any modifications must be clearly marked as such. ;;
;;; 3. Original authors' names are not deleted. ;;
;;; 4. The authors' names are not used to endorse or promote products ;;
;;; derived from this software without specific prior written ;;
;;; permission. ;;
;;; ;;
;;; THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK ;;
;;; DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ;;
;;; ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT ;;
;;; SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE ;;
;;; FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES ;;
;;; WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN ;;
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;;; ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF ;;
;;; THIS SOFTWARE. ;;
;;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Phrase boundary prediction.
;;;
;;; Two methods supported, if POS is enabled we use ngrams for that
;;; otherwise we use a CART tree
;;;
;;; Models trained from the IBM/Lancaster Spoken English Corpus and
;;; Boston University's FM Radio Corpus.
;;;
;;; Here's a very simple CART tree for predicting phrase breaks
;;; based on punctuation only
;;;
(set! simple_phrase_cart_tree
'
((lisp_token_end_punc in ("?" "." ":"))
((BB))
((lisp_token_end_punc in ("'" "\"" "," ";"))
((B))
((n.name is 0) ;; end of utterance
((BB))
((NB))))))
(define (token_end_punc word)
"(token_end_punc UTT WORD)
If punctuation at end of related Token and if WORD is last word
in Token return punc, otherwise 0."
(if (item.relation.next word "Token")
"0"
(item.feat word "R:Token.parent.punc")))
;;; This is a simple CART tree used after boundaries are predicted
;;; by the probabilistic method to get two levels of break
(set! english_phrase_type_tree
'((pbreak is NB)
((num_break is 1)
((mB))
((R:Token.parent.EMPH is 1)
((NB))
((n.R:Token.parent.EMPH is 1)
((NB))
((NB)))))
((pbreak is BB)
((BB))
((pbreak is mB)
((mB))
((name in ("." "!" "?"));; only (potentially) change Bs to BBs
((BB))
((B)))))))
(set! f2b_phrase_cart_tree
'
((gpos is punc)
(((1 0.00238095) (3 0) (4 0.997619) B))
(((4 0.00238095) (3 0) (1 0.997619) NB))))
;;; For more detailed prediction of phrase breaks we use POS and
;;; probability distribution of breaks
;;; These models were trained using data from the Lancaster/IBM
;;; Spoken English Corpus
(require 'pos) ;; for part of speech map
(defvar pbreak_ngram_dir libdir
"pbreak_ngram_dir
The directory containing the ngram models for predicting phrase
breaks. By default this is the standard library directory.")
(defvar english_phr_break_params
(list
;; The name and filename off the ngram with the a priori ngram model
;; for predicting phrase breaks in the Phrasify module. This model should
;; predict probability distributions for B and NB given some context of
;; part of speech tags.
(list 'pos_ngram_name 'english_break_pos_ngram)
(list 'pos_ngram_filename
(path-append pbreak_ngram_dir "sec.ts20.quad.ngrambin"))
;; The name and filename of the ngram containing the a posteriori ngram
;; for predicting phrase breaks in the Phrasify module. This module should
;; predict probability distributions for B and NB given previous B and
;; NBs.
(list 'break_ngram_name 'english_break_ngram)
(list 'break_ngram_filename
(path-append pbreak_ngram_dir "sec.B.hept.ngrambin"))
;; A weighting factor for breaks in the break/non-break ngram.
(list 'gram_scale_s 0.05)
;; When Phrase_Method is prob_models, this tree, if set is used to
;; potentially predict phrase type. At least some prob_models only
;; predict B or NB, this tree may be used to change some Bs into
;; BBs. If it is nil, the pbreak value predicted by prob_models
;; remains the same.
(list 'phrase_type_tree english_phrase_type_tree)
;; A list of tags used in identifying breaks. Typically B and NB (and
;; BB). This should be the alphabet of the ngram identified in
;; break_ngram_name
(list 'break_tags '(B NB))
(list 'pos_map english_pos_map_wp39_to_wp20)
)
"english_phr_break_params
Parameters for English phrase break statistical model.")
(defvar phr_break_params nil
"phr_break_params
Parameters for phrase break statistical model. This is typcal set by
a voice selection function to the parameters for a particular model.")
;;;
;;; Declaration of some features
;;;
(def_feature_docstring
'Word.pbreak
"Word.pbreak
Result from statistical phrasing module, may be B or NB denoting
phrase break or non-phrase break after the word.")
(def_feature_docstring
'Word.pbreak_score
"Word.pbreak_score
Log likelihood score from statistical phrasing module, for pbreak
value.")
(def_feature_docstring
'Word.blevel
"Word.blevel
A crude translation of phrase break into ToBI like phrase level.
Values may be 0,1,2,3,4.")
(define (Phrasify utt)
"(Phrasify utt)
Construct phrasify over Words module."
(let ((rval (apply_method 'Phrasify_Method utt)))
(cond
(rval rval) ;; new style
(t
(Classic_Phrasify utt)))))
(provide 'phrase)
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