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283 lines
9.4 KiB
C
283 lines
9.4 KiB
C
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* ====================================================================
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* Copyright (c) 2008 Carnegie Mellon University. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* This work was supported in part by funding from the Defense Advanced
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* Research Projects Agency and the National Science Foundation of the
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* United States of America, and the CMU Sphinx Speech Consortium.
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*
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* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ====================================================================
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*
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*/
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/**
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* @file ps_lattice_internal.h Word graph search implementation
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*/
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#ifndef __PS_LATTICE_INTERNAL_H__
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#define __PS_LATTICE_INTERNAL_H__
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/**
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* Linked list of DAG link pointers.
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*
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* Because the same link structure is used for forward and reverse
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* links, as well as for the agenda used in bestpath search, we can't
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* store the list pointer inside latlink_t. We could use glist_t
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* here, but it wastes 4 bytes per entry on 32-bit machines.
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*/
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typedef struct latlink_list_s {
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ps_latlink_t *link;
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struct latlink_list_s *next;
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} latlink_list_t;
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/**
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* Word graph structure used in bestpath/nbest search.
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*/
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struct ps_lattice_s {
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int refcount; /**< Reference count. */
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logmath_t *lmath; /**< Log-math object. */
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ps_search_t *search; /**< Search (if generated by search). */
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dict_t *dict; /**< Dictionary for this DAG. */
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int32 silence; /**< Silence word ID. */
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int32 frate; /**< Frame rate. */
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ps_latnode_t *nodes; /**< List of all nodes. */
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ps_latnode_t *start; /**< Starting node. */
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ps_latnode_t *end; /**< Ending node. */
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frame_idx_t n_frames; /**< Number of frames for this utterance. */
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int16 n_nodes; /**< Number of nodes in this lattice. */
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int32 final_node_ascr; /**< Acoustic score of implicit link exiting final node. */
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int32 norm; /**< Normalizer for posterior probabilities. */
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char *hyp_str; /**< Current hypothesis string. */
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listelem_alloc_t *latnode_alloc; /**< Node allocator for this DAG. */
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listelem_alloc_t *latlink_alloc; /**< Link allocator for this DAG. */
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listelem_alloc_t *latlink_list_alloc; /**< List element allocator for this DAG. */
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/* This will probably be replaced with a heap. */
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latlink_list_t *q_head; /**< Queue of links for traversal. */
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latlink_list_t *q_tail; /**< Queue of links for traversal. */
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};
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/**
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* Links between DAG nodes.
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*
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* A link corresponds to a single hypothesized instance of a word with
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* a given start and end point.
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*/
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struct ps_latlink_s {
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struct ps_latnode_s *from; /**< From node */
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struct ps_latnode_s *to; /**< To node */
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struct ps_latlink_s *best_prev;
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int32 ascr; /**< Score for from->wid (from->sf to this->ef) */
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int32 path_scr; /**< Best path score from root of DAG */
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frame_idx_t ef; /**< Ending frame of this word */
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int32 alpha; /**< Forward probability of this link P(w,o_1^{ef}) */
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int32 beta; /**< Backward probability of this link P(w|o_{ef+1}^T) */
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};
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/**
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* DAG nodes.
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*
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* A node corresponds to a number of hypothesized instances of a word
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* which all share the same starting point.
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*/
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struct ps_latnode_s {
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int32 id; /**< Unique id for this node */
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int32 wid; /**< Dictionary word id */
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int32 basewid; /**< Dictionary base word id */
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/* FIXME: These are (ab)used to store backpointer indices, therefore they MUST be 32 bits. */
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int32 fef; /**< First end frame */
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int32 lef; /**< Last end frame */
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frame_idx_t sf; /**< Start frame */
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int16 reachable; /**< From \verbatim </s> \endverbatim or \verbatim <s> \endverbatim */
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int32 node_id; /**< Node from fsg model, used to map lattice back to model */
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union {
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glist_t velist; /**< List of history entries with different lmstate (tst only) */
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int32 fanin; /**< Number nodes with links to this node */
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int32 rem_score; /**< Estimated best score from node.sf to end */
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int32 best_exit; /**< Best exit score (used for final nodes only) */
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} info;
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latlink_list_t *exits; /**< Links out of this node */
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latlink_list_t *entries; /**< Links into this node */
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struct ps_latnode_s *alt; /**< Node with alternate pronunciation for this word */
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struct ps_latnode_s *next; /**< Next node in DAG (no ordering implied) */
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};
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/**
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* Segmentation "iterator" for backpointer table results.
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*/
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typedef struct dag_seg_s {
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ps_seg_t base; /**< Base structure. */
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ps_latlink_t **links; /**< Array of lattice links. */
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int32 norm; /**< Normalizer for posterior probabilities. */
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int16 n_links; /**< Number of lattice links. */
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int16 cur; /**< Current position in bpidx. */
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} dag_seg_t;
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/**
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* Partial path structure used in N-best (A*) search.
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*
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* Each partial path (latpath_t) is constructed by extending another
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* partial path--parent--by one node.
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*/
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typedef struct ps_latpath_s {
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ps_latnode_t *node; /**< Node ending this path. */
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struct ps_latpath_s *parent; /**< Previous element in this path. */
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struct ps_latpath_s *next; /**< Pointer to next path in list of paths. */
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int32 score; /**< Exact score from start node up to node->sf. */
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} ps_latpath_t;
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/**
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* A* search structure.
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*/
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typedef struct ps_astar_s {
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ps_lattice_t *dag;
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ngram_model_t *lmset;
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float32 lwf;
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frame_idx_t sf;
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frame_idx_t ef;
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int32 w1;
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int32 w2;
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int32 n_hyp_tried;
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int32 n_hyp_insert;
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int32 n_hyp_reject;
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int32 insert_depth;
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int32 n_path;
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ps_latpath_t *path_list;
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ps_latpath_t *path_tail;
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ps_latpath_t *top;
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glist_t hyps; /**< List of hypothesis strings. */
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listelem_alloc_t *latpath_alloc; /**< Path allocator for N-best search. */
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} ps_astar_t;
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/**
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* Segmentation "iterator" for A* search results.
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*/
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typedef struct astar_seg_s {
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ps_seg_t base;
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ps_latnode_t **nodes;
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int n_nodes;
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int cur;
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} astar_seg_t;
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/**
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* Construct an empty word graph with reference to a search structure.
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*/
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ps_lattice_t *ps_lattice_init_search(ps_search_t *search, int n_frame);
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/**
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* Insert penalty for fillers
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*/
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void ps_lattice_penalize_fillers(ps_lattice_t *dag, int32 silpen, int32 fillpen);
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/**
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* Remove nodes marked as unreachable.
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*/
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void ps_lattice_delete_unreachable(ps_lattice_t *dag);
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/**
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* Add an edge to the traversal queue.
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*/
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void ps_lattice_pushq(ps_lattice_t *dag, ps_latlink_t *link);
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/**
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* Remove an edge from the traversal queue.
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*/
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ps_latlink_t *ps_lattice_popq(ps_lattice_t *dag);
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/**
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* Clear and reset the traversal queue.
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*/
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void ps_lattice_delq(ps_lattice_t *dag);
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/**
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* Create a new lattice link element.
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*/
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latlink_list_t *latlink_list_new(ps_lattice_t *dag, ps_latlink_t *link,
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latlink_list_t *next);
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/**
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* Get hypothesis string after bestpath search.
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*/
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char const *ps_lattice_hyp(ps_lattice_t *dag, ps_latlink_t *link);
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/**
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* Get hypothesis segmentation iterator after bestpath search.
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*/
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ps_seg_t *ps_lattice_seg_iter(ps_lattice_t *dag, ps_latlink_t *link,
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float32 lwf);
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/**
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* Begin N-Gram based A* search on a word graph.
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*
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* @param sf Starting frame for N-best search.
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* @param ef Ending frame for N-best search, or -1 for last frame.
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* @param w1 First context word, or -1 for none.
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* @param w2 Second context word, or -1 for none.
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* @return 0 for success, <0 on error.
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*/
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ps_astar_t *ps_astar_start(ps_lattice_t *dag,
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ngram_model_t *lmset,
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float32 lwf,
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int sf, int ef,
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int w1, int w2);
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/**
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* Find next best hypothesis of A* on a word graph.
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*
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* @return a complete path, or NULL if no more hypotheses exist.
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*/
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ps_latpath_t *ps_astar_next(ps_astar_t *nbest);
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/**
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* Finish N-best search, releasing resources associated with it.
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*/
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void ps_astar_finish(ps_astar_t *nbest);
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/**
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* Get hypothesis string from A* search.
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*/
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char const *ps_astar_hyp(ps_astar_t *nbest, ps_latpath_t *path);
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/**
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* Get hypothesis segmentation from A* search.
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*/
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ps_seg_t *ps_astar_seg_iter(ps_astar_t *astar, ps_latpath_t *path, float32 lwf);
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#endif /* __PS_LATTICE_INTERNAL_H__ */
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