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Diffstat (limited to 'media/sphinxbase/src/libsphinxbase/lm/ngram_model_arpa.h')
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1 files changed, 86 insertions, 0 deletions
diff --git a/media/sphinxbase/src/libsphinxbase/lm/ngram_model_arpa.h b/media/sphinxbase/src/libsphinxbase/lm/ngram_model_arpa.h new file mode 100644 index 000000000..2fd9e427d --- /dev/null +++ b/media/sphinxbase/src/libsphinxbase/lm/ngram_model_arpa.h @@ -0,0 +1,86 @@ +/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */ +/* ==================================================================== + * Copyright (c) 1999-2007 Carnegie Mellon University. All rights + * reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * This work was supported in part by funding from the Defense Advanced + * Research Projects Agency and the National Science Foundation of the + * United States of America, and the CMU Sphinx Speech Consortium. + * + * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND + * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY + * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * ==================================================================== + * + */ +/* + * \file ngram_model_arpa.h ARPABO text format for N-Gram models + * + * Author: David Huggins-Daines <dhuggins@cs.cmu.edu> + */ + +#ifndef __NGRAM_MODEL_ARPA_H__ +#define __NGRAM_MODEL_ARPA_H__ + +#include "ngram_model_internal.h" +#include "lm3g_model.h" + +/** + * Bigram structure. + */ +struct bigram_s { + uint32 wid; /**< Index of unigram entry for this. (NOT dictionary id.) */ + uint16 prob2; /**< Index into array of actual bigram probs */ + uint16 bo_wt2; /**< Index into array of actual bigram backoff wts */ + uint16 trigrams; /**< Index of 1st entry in lm_t.trigrams[], + RELATIVE TO its segment base (see above) */ +}; + +/** + * Trigram structure. + * + * As with bigrams, trigram prob info kept in a separate table for conserving + * memory space. + */ +struct trigram_s { + uint32 wid; /**< Index of unigram entry for this. (NOT dictionary id.) */ + uint16 prob3; /**< Index into array of actual trigram probs */ +}; + + +/** + * Subclass of ngram_model for ARPA file reading. + */ +typedef struct ngram_model_arpa_s { + ngram_model_t base; /**< Base ngram_model_t structure */ + lm3g_model_t lm3g; /**< Shared lm3g structure */ + + /* Arrays of unique bigram probs and bo-wts, and trigram probs + * (these are temporary, actually) */ + sorted_list_t sorted_prob2; + sorted_list_t sorted_bo_wt2; + sorted_list_t sorted_prob3; +} ngram_model_arpa_t; + +#endif /* __NGRAM_MODEL_ARPA_H__ */ |