libjulius/src/search_bestfirst_v1.c

説明を見る。

/*
 * Copyright (c) 1991-2011 Kawahara Lab., Kyoto University
 * Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 * Copyright (c) 2005-2011 Julius project team, Nagoya Institute of Technology
 * All rights reserved
 */

#include <julius/julius.h>

#ifndef PASS2_STRICT_IWCD

#undef TCD                      ///< Define if want triphone debug messages

/**********************************************************************/
/************ 仮説ノードの基本操作                         ************/
/************ Basic functions for hypothesis node handling ************/
/**********************************************************************/

#undef STOCKER_DEBUG

#ifdef STOCKER_DEBUG
static int stocked_num = 0;
static int reused_num = 0;
static int new_num = 0;
static int request_num = 0;
#endif

static void
free_node_exec(NODE *node)
{
  if (node == NULL) return;

  free(node->g);
  if (node->g_prev != NULL) free(node->g_prev);
#ifdef GRAPHOUT_PRECISE_BOUNDARY
  if (node->region->graphout) {
    free(node->wordend_frame);
    free(node->wordend_gscore);
  }
#endif

  free(node);
}

void
free_node(NODE *node)
{
  if (node == NULL) return;

  if (node->region->graphout) {
    if (node->prevgraph != NULL && node->prevgraph->saved == FALSE) {
      wordgraph_free(node->prevgraph);
    }
  }

  /* save to stocker */
  node->next = node->region->pass2.stocker_root;
  node->region->pass2.stocker_root = node;

#ifdef STOCKER_DEBUG
  stocked_num++;
#endif
}

void
clear_stocker(StackDecode *s)
{
  NODE *node, *tmp;
  node = s->stocker_root;
  while(node) {
    tmp = node->next;
    free_node_exec(node);
    node = tmp;
  }
  s->stocker_root = NULL;

#ifdef STOCKER_DEBUG
  jlog("DEBUG: %d times requested, %d times newly allocated, %d times reused\n", request_num, new_num, reused_num);
  stocked_num = 0;
  reused_num = 0;
  new_num = 0;
  request_num = 0;
#endif
}

NODE *
cpy_node(NODE *dst, NODE *src)
{
  int peseqlen;

  peseqlen = src->region->peseqlen;
  
  dst->next = src->next;
  dst->prev = src->prev;
  memcpy(dst->g, src->g, sizeof(LOGPROB) * peseqlen);
  memcpy(dst->seq, src->seq, sizeof(WORD_ID) * MAXSEQNUM);
#ifdef CM_SEARCH
#ifdef CM_MULTIPLE_ALPHA
  {
    int w;
    for(w=0;w<src->seqnum;w++) {
      memcpy(dst->cmscore[w], src->cmscore[w], sizeof(LOGPROB) * src->region->config->annotate.cm_alpha_num);
    }
  }     
#else
  memcpy(dst->cmscore, src->cmscore, sizeof(LOGPROB) * MAXSEQNUM);
#endif
#endif /* CM_SEARCH */
  dst->seqnum = src->seqnum;
  dst->score = src->score;
  dst->bestt = src->bestt;
  dst->estimated_next_t = src->estimated_next_t;
  dst->endflag = src->endflag;
  dst->state = src->state;
  dst->tre = src->tre;
  if (src->g_prev != NULL) { // ccd_flag == TRUE
    memcpy(dst->g_prev, src->g_prev, sizeof(LOGPROB) * peseqlen);
    dst->last_ph = src->last_ph;
    dst->last_ph_sp_attached = src->last_ph_sp_attached;
    dst->lscore = src->lscore;
  }
  dst->totallscore = src->totallscore;
  dst->final_g = src->final_g;
#ifdef VISUALIZE
  dst->popnode = src->popnode;
#endif

  if (src->region->graphout) {
#ifdef GRAPHOUT_PRECISE_BOUNDARY
    memcpy(dst->wordend_frame, src->wordend_frame, sizeof(short) * peseqlen);
    memcpy(dst->wordend_gscore, src->wordend_gscore, sizeof(LOGPROB) * peseqlen);
#endif
    dst->prevgraph = src->prevgraph;
    dst->lastcontext = src->lastcontext;
#ifndef GRAPHOUT_PRECISE_BOUNDARY
    dst->tail_g_score = src->tail_g_score;
#endif
  }

  return(dst);
}

NODE *
newnode(RecogProcess *r)
{
  NODE *tmp;
  int i;
  int peseqlen;

  peseqlen = r->peseqlen;

#ifdef STOCKER_DEBUG
  request_num++;
#endif
  if ((tmp = r->pass2.stocker_root) != NULL) {
    /* re-use ones in the stocker */
    r->pass2.stocker_root = tmp->next;
#ifdef STOCKER_DEBUG
    stocked_num--;
    reused_num++;
#endif
  } else {
    /* allocate new */
    tmp =(NODE *)mymalloc(sizeof(NODE));
    tmp->g = (LOGPROB *)mymalloc(sizeof(LOGPROB) * peseqlen);
    if (r->ccd_flag) {
      tmp->g_prev = (LOGPROB *)mymalloc(sizeof(LOGPROB) * peseqlen);
    } else {
      tmp->g_prev = NULL;
    }

#ifdef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      tmp->wordend_frame = (short *)mymalloc(sizeof(short) * peseqlen);
      tmp->wordend_gscore = (LOGPROB *)mymalloc(sizeof(LOGPROB) * peseqlen);
    }
#endif
#ifdef STOCKER_DEBUG
    new_num++;
#endif
  }

  /* clear the data */
  /*bzero(tmp,sizeof(NODE));*/
  tmp->next=NULL;
  tmp->prev=NULL;
  tmp->last_ph = NULL;
  tmp->last_ph_sp_attached = FALSE;
  if (r->ccd_flag) {
    if (r->lmtype == LM_PROB) {
      tmp->lscore = LOG_ZERO;
      tmp->totallscore = LOG_ZERO;
    } else if (r->lmtype == LM_DFA) {
      tmp->lscore = 0.0;
      tmp->totallscore = 0.0;
    }
  }
  tmp->endflag = FALSE;
  tmp->seqnum = 0;
  for(i=0;i<peseqlen;i++) {
    tmp->g[i] = LOG_ZERO;
  }
  if (r->ccd_flag) {
    for(i=0;i<peseqlen;i++) {
      tmp->g_prev[i] = LOG_ZERO;
    }
  }
  tmp->final_g = LOG_ZERO;
#ifdef VISUALIZE
  tmp->popnode = NULL;
#endif
  tmp->tre = NULL;

  if (r->graphout) {
    tmp->prevgraph = NULL;
    tmp->lastcontext = NULL;
  }

  tmp->region = r;

  return(tmp);
}


/**********************************************************************/
/************ 前向きトレリス展開と尤度計算              ***************/
/************ Expand trellis and update forward viterbi ***************/
/**********************************************************************/

void
malloc_wordtrellis(RecogProcess *r)
{
  int maxwn;
  StackDecode *dwrk;

  maxwn = r->lm->winfo->maxwn + 10;
  dwrk = &(r->pass2);

  dwrk->wordtrellis[0] = (LOGPROB *)mymalloc(sizeof(LOGPROB) * maxwn);
  dwrk->wordtrellis[1] = (LOGPROB *)mymalloc(sizeof(LOGPROB) * maxwn);

  dwrk->g = (LOGPROB *)mymalloc(sizeof(LOGPROB) * r->peseqlen);

  dwrk->phmmlen_max = r->lm->winfo->maxwlen + 2;
  dwrk->phmmseq = (HMM_Logical **)mymalloc(sizeof(HMM_Logical *) * dwrk->phmmlen_max);
  if (r->lm->config->enable_iwsp && r->am->hmminfo->multipath) {
    dwrk->has_sp = (boolean *)mymalloc(sizeof(boolean) * dwrk->phmmlen_max);
  } else {
    dwrk->has_sp = NULL;
  }

  dwrk->wend_token_frame[0] = NULL;
  dwrk->wend_token_frame[1] = NULL;
  dwrk->wend_token_gscore[0] = NULL;
  dwrk->wend_token_gscore[1] = NULL;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
  if (r->graphout) {
    dwrk->wend_token_frame[0] = (short *)mymalloc(sizeof(short) * maxwn);
    dwrk->wend_token_frame[1] = (short *)mymalloc(sizeof(short) * maxwn);
    dwrk->wend_token_gscore[0] = (LOGPROB *)mymalloc(sizeof(LOGPROB) * maxwn);
    dwrk->wend_token_gscore[1] = (LOGPROB *)mymalloc(sizeof(LOGPROB) * maxwn);
  }
#endif
  
}

void
free_wordtrellis(StackDecode *dwrk)
{
  int i;

  free(dwrk->wordtrellis[0]);
  free(dwrk->wordtrellis[1]);
  free(dwrk->g);
  free(dwrk->phmmseq);
  if (dwrk->has_sp) {
    free(dwrk->has_sp);
    dwrk->has_sp = NULL;
  }
#ifdef GRAPHOUT_PRECISE_BOUNDARY
  for(i=0;i<2;i++) {
    if (dwrk->wend_token_frame[i]) {
      free(dwrk->wend_token_frame[i]);
      dwrk->wend_token_frame[i] = NULL;
    }
    if (dwrk->wend_token_gscore[i]) {
      free(dwrk->wend_token_gscore[i]);
      dwrk->wend_token_gscore[i] = NULL;
    }
  }
#endif
}


/**********************************************************************/
/************ 仮説の前向き尤度計算                  *******************/
/************ Compute forward score of a hypothesis *******************/
/**********************************************************************/

static LOGPROB
get_max_out_arc(HTK_HMM_Trans *tr, int state_num)
{
  LOGPROB max_a;
  int afrom;
  LOGPROB a;
  
  max_a = LOG_ZERO;
  for (afrom = 0; afrom < state_num - 1; afrom++) {
    a = tr->a[afrom][state_num-1];
    if (max_a < a) max_a = a;
  }
  return(max_a);
}

static LOGPROB
max_out_arc(HMM_Logical *l)
{
  return(get_max_out_arc(hmm_logical_trans(l), hmm_logical_state_num(l)));
}

void
scan_word(NODE *now, HTK_Param *param, RecogProcess *r)
{
  int   i,t, j;
  HMM *whmm;
  A_CELL *ac;
  WORD_ID word;
  LOGPROB tmpmax, tmptmp, score1;
  int startt = 0, endt;
  int wordhmmnum;
  LOGPROB tmpmax_store, store_point_maxarc; /* multipath */
  LOGPROB tmpmax2 = LOG_ZERO;
  int phmmlen;
  HMM_Logical *ret, *wend;
  int store_point;
  int crossword_point = 0;
  boolean back_rescan = FALSE;
  boolean node_exist_p;
  int tn;                      
  int tl;                      

  /* store global values to local for rapid access */
  WORD_INFO *winfo;
  HTK_HMM_INFO *hmminfo;
  LOGPROB *framemaxscore;
  int peseqlen;
  boolean ccd_flag;
  boolean enable_iwsp;
#ifdef SCAN_BEAM
  LOGPROB scan_beam_thres;
#endif
  StackDecode *dwrk;

  winfo = r->lm->winfo;
  hmminfo = r->am->hmminfo;
  dwrk = &(r->pass2);
  peseqlen = r->peseqlen;
  framemaxscore = r->pass2.framemaxscore;
  ccd_flag = r->ccd_flag;
  enable_iwsp = r->lm->config->enable_iwsp; /* multipath */
#ifdef SCAN_BEAM
  scan_beam_thres = r->config->pass2.scan_beam_thres;
#endif

  if (hmminfo->multipath) {
    store_point = -1;
  } else {
    store_point = 0;
  }
  
  /* ----------------------- prepare HMM ----------------------- */

  if (ccd_flag) {
    /* 直前の音素があれば，そこまでさかのぼって scan する */
    /* if there are any last phone, enable backscan */
    if (now->last_ph == NULL) {
      /* initial score: now->g[] */
      /* scan range: phones in now->seq[now->seqnum-1] */
      back_rescan = FALSE;
    } else {
      /* initial score: now->g_prev[] (1-phone before)*/
      /* scan range: phones in now->seq[now->seqnum-1] + now->last_ph */
      back_rescan = TRUE;
    }
  }
#ifdef TCD
  if (now->last_ph != NULL) {
    jlog("DEBUG: inherited last_ph: %s\n", (now->last_ph)->name);
    if (now->last_ph_sp_attached) jlog("DEBUG: (sp attached)\n"); /* multipath */
  } else {
    jlog("DEBUG: no last_ph inherited\n");
  }
#endif

  /* scan 範囲分のHMMを準備 */
  /* prepare HMM of the scan range */
  word = now->seq[now->seqnum-1];

  if (ccd_flag) {

    if (back_rescan) {
      
      /* scan range: phones in now->seq[now->seqnum-1] + now->last_ph */
      
      phmmlen = winfo->wlen[word] + 1;
      if (phmmlen > dwrk->phmmlen_max) {
        j_internal_error("scan_word: num of phonemes in a word exceed phmmlenmax (%d) ?\n", dwrk->phmmlen_max);
      }
      for (i=0;i<phmmlen - 2;i++) dwrk->phmmseq[i] = winfo->wseq[word][i];
      if (enable_iwsp && hmminfo->multipath) {
        for (i=0;i<phmmlen - 2;i++) dwrk->has_sp[i] = FALSE;
      }

      /* 最終単語と last_ph 間の単語間triphoneを考慮 */
      /* consider cross-word context dependency between the last word and now->last_ph */
      wend = winfo->wseq[word][winfo->wlen[word]-1];
      ret = get_right_context_HMM(wend, now->last_ph->name, hmminfo);
      if (ret == NULL) {        /* triphone not found */
        /* fallback to the original bi/mono-phone */
        /* error if the original is pseudo phone (not explicitly defined
           in hmmdefs/hmmlist) */
        /* exception: word with 1 phone (triphone may exist in the next expansion */
        if (winfo->wlen[word] > 1 && wend->is_pseudo) {
          error_missing_right_triphone(wend, now->last_ph->name);
        }
        dwrk->phmmseq[phmmlen-2] = wend;
      } else {
        dwrk->phmmseq[phmmlen-2] = ret;
      }
      ret = get_left_context_HMM(now->last_ph, wend->name, hmminfo);
      if (ret == NULL) {
        /* fallback to the original bi/mono-phone */
        /* error if the original is pseudo phone (not explicitly defined
           in hmmdefs/hmmlist) */
        if (now->last_ph->is_pseudo) {
          error_missing_left_triphone(now->last_ph, wend->name);
        }
        dwrk->phmmseq[phmmlen-1] = now->last_ph;
      } else {
        dwrk->phmmseq[phmmlen-1] = ret;
      }

      if (enable_iwsp && hmminfo->multipath) {
        dwrk->has_sp[phmmlen-2] = TRUE;
        dwrk->has_sp[phmmlen-1] = now->last_ph_sp_attached;
      }
 
#ifdef TCD
      jlog("DEBUG: w=");
      for(i=0;i<winfo->wlen[word];i++) {
        jlog(" %s",(winfo->wseq[word][i])->name);
        if (enable_iwsp && hmminfo->multipath && dwrk->has_sp[i]) jlog("(sp)");
      }
      jlog(" | %s\n", (now->last_ph)->name);
      if (hmminfo->multipath && now->last_ph_sp_attached) jlog("DEBUG:   (sp)\n");
      jlog("DEBUG: scan for:");
      
      for (i=0;i<phmmlen;i++) {
        jlog(" %s", dwrk->phmmseq[i]->name);
        if (enable_iwsp && hmminfo->multipath && dwrk->has_sp[i]) jlog("(sp)");
      }
      jlog("\n");
#endif

      /* 単語HMMを作る */
      /* make word HMM */
      whmm = new_make_word_hmm(hmminfo, dwrk->phmmseq, phmmlen, (enable_iwsp && hmminfo->multipath) ? dwrk->has_sp : NULL);
      if (whmm == NULL) {
        j_internal_error("Error: failed to make word hmm for word #%d \"%s [%s]\"\n", word, winfo->wname[word], winfo->woutput[word]);
      }
      
      /* backscan なので，計算前の g[] 初期値は now->g_prev[] を使用 */
      /* As backscan enabled, the initial forward score g[] is set by
         now->g_prev[] */
      for (t=0;t<peseqlen;t++) {
        dwrk->g[t]=now->g_prev[t];

      }
      
      /* 次段用のg_prevを格納するノード位置を設定 */
      /* set where to store scores as new g_prev[] for the next backscan
         in the HMM */
      if (hmminfo->multipath) {
        store_point = hmm_logical_state_num(dwrk->phmmseq[0]) - 2;
        store_point_maxarc = max_out_arc(dwrk->phmmseq[0]);
        if (enable_iwsp && dwrk->has_sp[0]) {
          store_point += hmm_logical_state_num(hmminfo->sp) - 2;
          if (store_point_maxarc < max_out_arc(hmminfo->sp)) {
            store_point_maxarc = max_out_arc(hmminfo->sp);
          }
        }
      } else {
        store_point = hmm_logical_state_num(dwrk->phmmseq[0]) - 2 - 1;
      }
      /* scan中に直前単語とこの単語をまたぐ場所を設定 */
      /* set where is the connection point of the last word in the HMM */
      if (hmminfo->multipath) {
        crossword_point = whmm->len - hmm_logical_state_num(dwrk->phmmseq[phmmlen-1]);
        if (enable_iwsp && dwrk->has_sp[phmmlen-1]) {
          crossword_point -= hmm_logical_state_num(hmminfo->sp) - 2;
        }
      } else {
        crossword_point = whmm->len - (hmm_logical_state_num(dwrk->phmmseq[phmmlen-1]) - 2) - 1;
      }
      
    } else {                    /* not backscan mode */
      
      /* scan range: phones in now->seq[now->seqnum-1] */
      
#ifdef TCD
      jlog("DEBUG: scan(org):");
      for (i=0;i<winfo->wlen[word];i++) {
        jlog(" %s", (winfo->wseq[word][i])->name);
      }
      jlog("\n");
#endif

      if (enable_iwsp && hmminfo->multipath) {
        /* 必要ならばショートポーズを挟み込む位置を指定する */
        for(i=0;i<winfo->wlen[word];i++) {
          dwrk->has_sp[i] = FALSE;
        }
        dwrk->has_sp[winfo->wlen[word]-1] = TRUE;
      }
      
      /* 単語HMMを作る */
      /* make word HMM */
      whmm = new_make_word_hmm(hmminfo, winfo->wseq[word], winfo->wlen[word], (enable_iwsp && hmminfo->multipath) ? dwrk->has_sp : NULL);
      if (whmm == NULL) {
        j_internal_error("Error: failed to make word hmm for word #%d \"%s [%s]\"\n", word, winfo->wname[word], winfo->woutput[word]);
      }
      
      /* 計算前の g[] 初期値は now->g[] を使用 */
      /* the initial forward score g[] is set by now->g[] */
      for (t=0;t<peseqlen;t++) {
        dwrk->g[t]=now->g[t];
      }
      
      /* 次段用のg_prevを格納するノード位置を設定 */
      /* set where to store scores as new g_prev[] for the next backscan
         in the HMM */
      if (hmminfo->multipath) {
        store_point = hmm_logical_state_num(winfo->wseq[word][0]) - 2;
        store_point_maxarc = max_out_arc(winfo->wseq[word][0]);
        if (enable_iwsp && dwrk->has_sp[0]) {
          store_point += hmm_logical_state_num(hmminfo->sp) - 2;
          if (store_point_maxarc < max_out_arc(hmminfo->sp)) {
            store_point_maxarc = max_out_arc(hmminfo->sp);
          }
        }
      } else {
        store_point = hmm_logical_state_num(winfo->wseq[word][0]) - 2 - 1;
      }

      /* scan中に直前単語とこの単語をまたぐ場所は，なし */
      /* the connection point of the last word is not exist in the HMM */
      crossword_point = -1;
    }
    
  } else {                      /* ccd_flag == FALSE */

    if (enable_iwsp && hmminfo->multipath) {
      /* 必要ならばショートポーズを挟み込む位置を指定する */
      for(i=0;i<winfo->wlen[word];i++) {
        dwrk->has_sp[i] = FALSE;
      }
      dwrk->has_sp[winfo->wlen[word]-1] = TRUE;
    }

    /* 音素環境非依存の場合は単純に最終単語分の HMM を作成 */
    /* for monophone: simple make HMM for the last word */
    whmm = new_make_word_hmm(hmminfo, winfo->wseq[word], winfo->wlen[word], (enable_iwsp && hmminfo->multipath) ? dwrk->has_sp : NULL);
    if (whmm == NULL) {
      j_internal_error("Error: failed to make word hmm for word #%d \"%s [%s]\"\n", word, winfo->wname[word], winfo->woutput[word]);
    }

    /* 計算前の g[] 初期値は now->g[] を使用 */
    /* the initial forward score g[] is set by now->g[] */
    for (t=0;t<peseqlen;t++) {
      dwrk->g[t]=now->g[t];
    }
    
  }

#ifdef TCD
  jlog("DEBUG: whmm len   = %d\n",whmm->len);
  jlog("DEBUG: crossword_point = %d\n", crossword_point);
  jlog("DEBUG: g[] store point = %d\n", store_point);
#endif

  wordhmmnum = whmm->len;
  if (wordhmmnum >= winfo->maxwn + 10) {
    j_internal_error("scan_word: word too long (>%d)\n", winfo->maxwn + 10);
  }

#ifndef GRAPHOUT_PRECISE_BOUNDARY
  if (r->graphout) {
    if (ccd_flag) {
      now->tail_g_score = now->g[now->bestt];
    }
  }
#endif

  /* ----------------------- do scan ----------------------- */
  
  /* scan開始点を検索 -> starttへ*/
  /* search for the start frame -> set to startt */
  for(t = peseqlen-1; t >=0 ; t--) {
    if (
#ifdef SCAN_BEAM
        dwrk->g[t] > framemaxscore[t] - scan_beam_thres &&
#endif
        dwrk->g[t] > LOG_ZERO) {
      break;
    }
  }
  if (t < 0) {                  /* no node has score > LOG_ZERO */
    for(t=0;t<peseqlen;t++) {
      if (ccd_flag) now->g_prev[t] = LOG_ZERO;
      now->g[t] = LOG_ZERO;
    }
#ifdef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      for(t=0;t<peseqlen;t++) {
        now->wordend_frame[t] = -1;
        now->wordend_gscore[t] = LOG_ZERO;
      }
    }
#endif
    goto end_of_scan;
  }
  startt = t;
  
  /* clear [startt+1..peseqlen-1] */
  for(t=peseqlen-1;t>startt;t--) {
    if (ccd_flag) now->g_prev[t] = LOG_ZERO;
    now->g[t] = LOG_ZERO;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      now->wordend_frame[t] = -1;
      now->wordend_gscore[t] = LOG_ZERO;
    }
#endif
  }

  /* バッファポインタ初期化 */
  tn = 0; tl = 1;

#ifdef GRAPHOUT_PRECISE_BOUNDARY
  if (r->graphout) {
    for(i=0;i<wordhmmnum;i++) {
      dwrk->wend_token_frame[tn][i] = -1;
      dwrk->wend_token_gscore[tn][i] = LOG_ZERO;
    }
  }
#endif
  
  if (! hmminfo->multipath) {
    /* Below initialization is not needed on multipath version, since
       the actual viterbi will begin at frame 0 in multipath mode in main loop */
    
    /* 時間 [startt] 上の値を初期化 */
    /* initialize scores on frame [startt] */
    for(i=0;i<wordhmmnum-1;i++) dwrk->wordtrellis[tn][i] = LOG_ZERO;
    dwrk->wordtrellis[tn][wordhmmnum-1] = dwrk->g[startt] + outprob(&(r->am->hmmwrk), startt, &(whmm->state[wordhmmnum-1]), param);
    if (ccd_flag) {
      now->g_prev[startt] = dwrk->wordtrellis[tn][store_point];
    }
    now->g[startt] = dwrk->wordtrellis[tn][0];
    
#ifdef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      if (ccd_flag) {
        if (back_rescan) {
          if (wordhmmnum-1 == crossword_point) {
            dwrk->wend_token_frame[tn][wordhmmnum-1] = startt;
            dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->g[startt];
          } else {
            dwrk->wend_token_frame[tn][wordhmmnum-1] = -1;
            dwrk->wend_token_gscore[tn][wordhmmnum-1] = LOG_ZERO;
          }
        } else {
          dwrk->wend_token_frame[tn][wordhmmnum-1] = startt;
          dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->g[startt];
        }
      } else {
        dwrk->wend_token_frame[tn][wordhmmnum-1] = startt;
        dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->g[startt];
      }
      now->wordend_frame[startt] = dwrk->wend_token_frame[tn][0];
      now->wordend_gscore[startt] = dwrk->wend_token_gscore[tn][0];
    }
#endif
  } /* end of hmminfo->multipath */
  
  endt = startt;

  /* メインループ: startt から始まり 0 に向かって Viterbi 計算 */
  /* main loop: start from [startt], and compute Viterbi toward [0] */
  for(t = hmminfo->multipath ? startt : startt - 1; t >= 0; t--) {
    
    /* wordtrellisのワークエリアをスワップ */
    i = tn; tn = tl; tl = i;
    
    node_exist_p = FALSE;       /* TRUE if there is at least 1 survived node in this frame */

    if (hmminfo->multipath) {

      /* 端のノード [t][wordhmmnum-1]は g[] を参照する */
      /* the edge node [t][wordhmmnum-1] is equal to g[] */

      /* ノード [t][wordhmmnum-2..0] についてトレリスを計算 */
      /* expand trellis for node [t][wordhmmnum-2..0] */
      tmpmax_store = LOG_ZERO;

    } else {
    
      /* 端のノード [t][wordhmmnum-1]は，内部遷移 か g[]の高い方になる */
      /* the edge node [t][wordhmmnum-1] is either internal transitin or g[] */
      tmptmp = LOG_ZERO;
      for (ac=whmm->state[wordhmmnum-1].ac;ac;ac=ac->next) {
        score1 = dwrk->wordtrellis[tl][ac->arc] + ac->a;
        if (tmptmp < score1) {
          j = ac->arc;
          tmptmp = score1;
        }
      }
      if (dwrk->g[t] > tmptmp) {
        tmpmax = dwrk->g[t];
#ifdef GRAPHOUT_PRECISE_BOUNDARY
        if (r->graphout) {
          if (!back_rescan || wordhmmnum-1 == crossword_point) {
            dwrk->wend_token_frame[tn][wordhmmnum-1] = t;
            dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->g[t];
          } else {
            dwrk->wend_token_frame[tn][wordhmmnum-1] = dwrk->wend_token_frame[tl][j];
            dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->wend_token_gscore[tl][j];
          }
        }
#endif
      } else {
        tmpmax = tmptmp;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
        if (r->graphout) {
          dwrk->wend_token_frame[tn][wordhmmnum-1] = dwrk->wend_token_frame[tl][j];
          dwrk->wend_token_gscore[tn][wordhmmnum-1] = dwrk->wend_token_gscore[tl][j];
        }
#endif
      }

      /* 端のノードのスコアエンベロープチェック: 一定幅外なら落とす */
      /* check if the edge node is within score envelope */
      if (
#ifdef SCAN_BEAM
          tmpmax <= framemaxscore[t] - scan_beam_thres ||
#endif
          tmpmax <= LOG_ZERO
          ) {
        dwrk->wordtrellis[tn][wordhmmnum-1] = LOG_ZERO;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
        if (r->graphout) {
          dwrk->wend_token_frame[tn][wordhmmnum-1] = -1;
          dwrk->wend_token_gscore[tn][wordhmmnum-1] = LOG_ZERO;
        }
#endif
      } else {
        node_exist_p = TRUE;
        dwrk->wordtrellis[tn][wordhmmnum-1] = tmpmax + outprob(&(r->am->hmmwrk), t, &(whmm->state[wordhmmnum-1]), param);
      }

    } /* end of ~multipath */

    /* ノード [t][wordhmmnum-2..0] についてトレリスを計算 */
    /* expand trellis for node [t][wordhmmnum-2..0] */
    for(i=wordhmmnum-2;i>=0;i--) {

      if (ccd_flag) {

        /* 最尤パスと最尤スコア tmpmax を見つける */
        /* tmpmax2 は次回用 g_prev[] のための最大値(自己遷移を除いた最大値) */
        /* find most likely path and the max score 'tmpmax' */
        /* 'tmpmax2' is max score excluding self transition, for next g_prev[] */
        if (! hmminfo->multipath) {
          if (i == store_point) {
            tmpmax2 = LOG_ZERO;
          }
        }
        tmpmax = LOG_ZERO;
        for (ac=whmm->state[i].ac;ac;ac=ac->next) {
          if (hmminfo->multipath) {
            if (ac->arc == wordhmmnum-1) score1 = dwrk->g[t];
            else if (t + 1 > startt) score1 = LOG_ZERO;
            else score1 = dwrk->wordtrellis[tl][ac->arc];
            score1 += ac->a;
          } else {
            score1 = dwrk->wordtrellis[tl][ac->arc] + ac->a;
          }
          if (i <= crossword_point && ac->arc > crossword_point) {
            /* これは単語を越える遷移 (backscan 実行時) */
            /* this is a transition across word (when backscan is enabled) */
            score1 += now->lscore; /* add LM score */
          }

          if (hmminfo->multipath) {
            if (i <= store_point && ac->arc > store_point) {
              if (tmpmax_store < score1) tmpmax_store = score1;
            }
          } else {
            if (i == store_point && i != ac->arc) {
              if (tmpmax2 < score1) tmpmax2 = score1;
            }
          }

          if (tmpmax < score1) {
            tmpmax = score1;
            j = ac->arc;
          }
        }

        /* スコアエンベロープチェック: 一定幅外なら落とす */
        /* check if score of this node is within the score envelope */
        if (
#ifdef SCAN_BEAM
            tmpmax <= framemaxscore[t] - scan_beam_thres ||
#endif
            tmpmax <= LOG_ZERO
            ) {  /* invalid node */
          dwrk->wordtrellis[tn][i] = LOG_ZERO;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
          if (r->graphout) {
            dwrk->wend_token_frame[tn][i] = -1;
            dwrk->wend_token_gscore[tn][i] = LOG_ZERO;
          }
#endif
          if (! hmminfo->multipath) {
            if (i == store_point) now->g_prev[t] = LOG_ZERO;
          }
        } else { /* survived node */
          if (! hmminfo->multipath) {
            if (i == store_point) now->g_prev[t] = tmpmax2;
          }
#ifdef GRAPHOUT_PRECISE_BOUNDARY
          if (r->graphout) {

            if (hmminfo->multipath) {
              if ((back_rescan && i <= crossword_point && j > crossword_point)
                  || j == wordhmmnum-1) {
                dwrk->wend_token_frame[tn][i] = t;
                dwrk->wend_token_gscore[tn][i] = tmpmax;
              } else {
                dwrk->wend_token_frame[tn][i] = dwrk->wend_token_frame[tl][j];
                dwrk->wend_token_gscore[tn][i] = dwrk->wend_token_gscore[tl][j];
              }
            } else {
              if (i <= crossword_point && j > crossword_point) {
                dwrk->wend_token_frame[tn][i] = t;
                dwrk->wend_token_gscore[tn][i] = tmpmax;
              } else {
                dwrk->wend_token_frame[tn][i] = dwrk->wend_token_frame[tl][j];
                dwrk->wend_token_gscore[tn][i] = dwrk->wend_token_gscore[tl][j];
              }
            }
          }
#endif
          node_exist_p = TRUE;  /* at least one node survive in this frame */

          dwrk->wordtrellis[tn][i] = tmpmax;
          if (! hmminfo->multipath || i > 0) {
            /* compute output probability */
            dwrk->wordtrellis[tn][i] += outprob(&(r->am->hmmwrk), t, &(whmm->state[i]), param);
          }
        }
        
      } else {                  /* not triphone */

        /* backscan 無し: store_point, crossword_point は無関係 */
        /* no backscan: store_point, crossword_point ignored */
        tmpmax = LOG_ZERO;
        if (hmminfo->multipath) {
          for (ac=whmm->state[i].ac;ac;ac=ac->next) {
            if (ac->arc == wordhmmnum-1) score1 = dwrk->g[t];
            else if (t + 1 > startt) score1 = LOG_ZERO;
            else score1 = dwrk->wordtrellis[tl][ac->arc];
            score1 += ac->a;
            if (tmpmax < score1) {
              tmpmax = score1;
              j = ac->arc;
            }
          }
        } else {
          for (ac=whmm->state[i].ac;ac;ac=ac->next) {
            score1 = dwrk->wordtrellis[tl][ac->arc] + ac->a;
            if (tmpmax < score1) {
              tmpmax = score1;
              j = ac->arc;
            }
          }
        }

        /* スコアエンベロープチェック: 一定幅外なら落とす */
        /* check if score of this node is within the score envelope */
        if (
#ifdef SCAN_BEAM
            tmpmax <= framemaxscore[t] - scan_beam_thres ||
#endif
            tmpmax <= LOG_ZERO
            ) {
          /* invalid node */
          dwrk->wordtrellis[tn][i] = LOG_ZERO;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
          if (r->graphout) {
            dwrk->wend_token_frame[tn][i] = -1;
            dwrk->wend_token_gscore[tn][i] = LOG_ZERO;
          }
#endif
        } else {
          /* survived node */
          node_exist_p = TRUE;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
          if (r->graphout) {
            if (hmminfo->multipath) {
              if (j == wordhmmnum-1) {
                dwrk->wend_token_frame[tn][i] = t;
                dwrk->wend_token_gscore[tn][i] = tmpmax;
              } else {
                dwrk->wend_token_frame[tn][i] = dwrk->wend_token_frame[tl][j];
                dwrk->wend_token_gscore[tn][i] = dwrk->wend_token_gscore[tl][j];
              }
            } else {
              dwrk->wend_token_frame[tn][i] = dwrk->wend_token_frame[tl][j];
              dwrk->wend_token_gscore[tn][i] = dwrk->wend_token_gscore[tl][j];
            }
          }
#endif
          /* score of node [t][i] has been determined here */
          dwrk->wordtrellis[tn][i] = tmpmax;
          if (! hmminfo->multipath || i > 0) {
            dwrk->wordtrellis[tn][i] += outprob(&(r->am->hmmwrk), t, &(whmm->state[i]), param);
          }
        }
        
      }
    } /* end of node loop */

    /* 時間 t のViterbi計算終了. 前向きスコアはscanした単語の始端 */
    /* Viterbi end for frame [t].  the forward score is the score of word
       beginning scanned */
    now->g[t] = dwrk->wordtrellis[tn][0];
#ifdef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      now->wordend_frame[t] = dwrk->wend_token_frame[tn][0];
      now->wordend_gscore[t] = dwrk->wend_token_gscore[tn][0];
    }
#endif

    if (hmminfo->multipath) {
      /* triphone 時, 次段のために store_point のデータをg_prevに保存 */
      /* store the scores crossing the store_point to g_prev, for next scan */
      if (ccd_flag) {
        /* the max arc crossing the store_point always selected as tmpmax_score */ 
        tmpmax_store -= store_point_maxarc;
        if (tmpmax_store < LOG_ZERO) tmpmax_store = LOG_ZERO;
        now->g_prev[t] = tmpmax_store;
      }
    }

    /* store the number of last computed frame */
    if (node_exist_p) endt = t;
    
    /* scanした単語の第１パスでの始端時刻より先まで t が進んでおり，かつ
       この t においてスコアエンベロープによって生き残ったノードが一つも
       無かったならば,このフレームで計算を打ち切りそれ以上先([0..t-1])は
       計算しない */
    /* if frame 't' already reached the beginning frame of scanned word
       in 1st pass and no node was survived in this frame (all nodes pruned
       by score envelope), terminate computation at this frame and
       do not computer further frame ([0..t-1]). */
    if (t < now->estimated_next_t && (!node_exist_p)) {
      /* clear the rest scores */
      for (i=t-1;i>=0;i--) {
        now->g[i] = LOG_ZERO;
#ifdef GRAPHOUT_PRECISE_BOUNDARY
        if (r->graphout) {
          now->wordend_frame[i] = -1;
          now->wordend_gscore[i] = LOG_ZERO;
        }
#endif
        if (ccd_flag) now->g_prev[i] = LOG_ZERO;
      }
      /* terminate loop */
      break;
    }
    
  } /* end of time loop */
  
  if (debug2_flag) jlog("DEBUG: scanned: [%3d-%3d]\n", endt, startt);

 end_of_scan:

  if (hmminfo->multipath) {
    /* 前向きスコアの最終値を計算 (状態 0 から時間 0 への遷移) */
    /* compute the total forward score (transition from state 0 to frame 0 */
    if (endt == 0) {
      tmpmax = LOG_ZERO;
      for(ac=whmm->state[0].ac;ac;ac=ac->next) {
        score1 = dwrk->wordtrellis[tn][ac->arc] + ac->a;
        if (tmpmax < score1) tmpmax = score1;
      }
      now->final_g = score1;
    } else {
      now->final_g = LOG_ZERO;
    }
  }
  
  /* 次回 backscan のための情報格納 */
  /* store data for next backscan */
  if (ccd_flag) {
    if (store_point == (hmminfo->multipath ? wordhmmnum - 2 : wordhmmnum - 1)) {
      /* last_ph無し，かつ単語の音素長=1の場合、次回の scan_word() で
         単語全体がもう一度再計算される. この場合,
         g_prev は，このscan_wordを開始する前のスコアを入れておく必要がある */
      /* if there was no 'last_ph' and the scanned word consists of only
         1 phone, the whole word should be re-computed in the future scan_word().
         So the next 'g_prev[]' should be the initial forward scores
         before we begin Viterbi (= g[t]). */
      for (t = startt; t>=0; t--) {
        now->g_prev[t] = dwrk->g[t];
      }
    }
#ifndef GRAPHOUT_PRECISE_BOUNDARY
    if (r->graphout) {
      if (now->tail_g_score != LOG_ZERO) {
        if (now->prevgraph != NULL) {
          (now->prevgraph)->leftscore = now->tail_g_score;
        }
      }
    }
#endif
    /* 次回のために now->last_ph を更新 */
    /* update 'now->last_ph' for future scan_word() */
    if (back_rescan) {
      now->last_ph = dwrk->phmmseq[0];
    } else {
      now->last_ph = winfo->wseq[word][0];
    }
    if (enable_iwsp && hmminfo->multipath) {
      now->last_ph_sp_attached = dwrk->has_sp[0];
    }
  }

#ifdef GRAPHOUT_PRECISE_BOUNDARY
  if (! hmminfo->multipath) {
    if (r->graphout) {
      /* 次回の next_word 用に境界情報を調整 */
      /* proceed word boundary for one step for next_word */
      now->wordend_frame[peseqlen-1] = now->wordend_frame[0];
      now->wordend_gscore[peseqlen-1] = now->wordend_gscore[0];
      for (t=0;t<peseqlen-1;t++) {
        now->wordend_frame[t] = now->wordend_frame[t+1];
        now->wordend_gscore[t] = now->wordend_gscore[t+1];
      }
    }
  }
#endif

  /* free work area */
  free_hmm(whmm);
#ifdef TCD
  if (hmminfo->multipath) {
    if (ccd_flag) {
      jlog("DEBUG: last_ph = %s", (now->last_ph)->name);
      if (now->last_ph_sp_attached) jlog(" (sp attached)");
      jlog("\n");
    }
  } else {
    jlog("DEBUG: last_ph = %s\n", (now->last_ph)->name);
  }
#endif
}


/**************************************************************************/
/*** 新仮説の展開とヒューリスティックを繋いだ全体スコアを計算           ***/
/*** Expand new hypothesis and compute the total score (with heuristic) ***/
/**************************************************************************/

void
next_word(NODE *now, NODE *new, NEXTWORD *nword, HTK_Param *param, RecogProcess *r)
{
  int   t;
  HMM_Logical *newphone;
  int lastword;
  int   i;
  LOGPROB tmpp;
  LOGPROB a_value;
  int   startt;
  int word;
  LOGPROB totalscore;
  TRELLIS_ATOM *tre;

  BACKTRELLIS *backtrellis;
  WORD_INFO *winfo;
  HTK_HMM_INFO *hmminfo;
  int peseqlen;
  boolean ccd_flag;

  backtrellis = r->backtrellis;
  winfo = r->lm->winfo;
  hmminfo = r->am->hmminfo;
  peseqlen = r->peseqlen;
  ccd_flag = r->ccd_flag;

  new->score = LOG_ZERO;

  word = nword->id;
  lastword=now->seq[now->seqnum-1];

  /* 単語並び、DFA状態番号、言語スコアを継承・更新 */
  /* inherit and update word sequence, DFA state and total LM score */
  for (i=0;i< now->seqnum;i++){ 
    new->seq[i] = now->seq[i];
#ifdef CM_SEARCH
#ifdef CM_MULTIPLE_ALPHA
    memcpy(new->cmscore[i], now->cmscore[i], sizeof(LOGPROB) * r->config->annotate.cm_alpha_num);
#else
    new->cmscore[i] = now->cmscore[i];
#endif
#endif /* CM_SEARCH */
  }
  new->seq[i] = word;
  new->seqnum = now->seqnum+1;
  new->state = nword->next_state;
  new->totallscore = now->totallscore + nword->lscore;
  if (hmminfo->multipath) new->final_g = now->final_g;
  
  if (ccd_flag) {
    
    /* 展開単語の接続点の音素HMMをnewphoneにセットする. 
       元仮説 now との単語間の音素環境依存性を考慮する */
    /* set the triphone at the connection point to 'newphone', considering
       cross-word context dependency to 'now' */
    newphone = get_right_context_HMM(winfo->wseq[word][winfo->wlen[word]-1], now->last_ph->name, hmminfo);
    if (newphone == NULL) {     /* triphone not found */
      /* fallback to the original bi/mono-phone */
      /* error if the original is pseudo phone (not explicitly defined
         in hmmdefs/hmmlist) */
      /* exception: word with 1 phone (triphone may exist in the next expansion */
      if (winfo->wlen[word] > 1 && winfo->wseq[word][winfo->wlen[word]-1]->is_pseudo){
        error_missing_right_triphone(winfo->wseq[word][winfo->wlen[word]-1], now->last_ph->name);
      }
      newphone = winfo->wseq[word][winfo->wlen[word]-1];
    }
    
    /* 元仮説をscanした時の末端音素HMM -> 新仮説の直前音素HMM */
    /* inherit last_ph */
    new->last_ph = now->last_ph;
    if (hmminfo->multipath) {
      new->last_ph_sp_attached = now->last_ph_sp_attached;
    }
    
    /* backscan用接続ポイントのスコア g_prev[] をコピー */
    /* copy g_prev[] that are scores at backscan connection point */
    for (t=0;t<peseqlen;t++) {
      new->g_prev[t] = now->g_prev[t];
    }
    
  } else {                      /* not triphone */
    
    /* 展開単語の接続(=終端)の音素HMMをnewphoneにセット */
    /* set the phone at the connection point to 'newphone' */
    newphone = winfo->wseq[word][winfo->wlen[word]-1];
  }


  /* 接続確率を与える */
  new->lscore = nword->lscore;

  if (! hmminfo->multipath) {
    /* a_value: 接続点の遷移確率 */
    /* a_value: transition probability of connection point */
    i = hmm_logical_state_num(newphone);
    a_value = (hmm_logical_trans(newphone))->a[i-2][i-1];
  }

  /***************************************************************************/
  /* 前向き(第２パス),後ろ向き(第１パス)トレリスを接続し最尤接続点を見つける */
  /* connect forward/backward trellis to look for the best connection time   */
  /***************************************************************************/

  if (hmminfo->multipath) {
    startt = peseqlen-1;
  } else {
    startt = peseqlen-2;
    new->g[startt+1] = LOG_ZERO;
  }

  /*-----------------------------------------------------------------*/
  /* 単語トレリスを探して, 次単語の最尤接続点を発見する */
  /* determine the best connection time of the new word, seeking the word
     trellis */
  /*-----------------------------------------------------------------*/

  /* update new->g[t] */
  if (hmminfo->multipath) {
    for(t=startt;t>=0;t--) {
      new->g[t] = now->g[t] + nword->lscore;
    }
  } else {
    for(t=startt;t>=0;t--) {
      new->g[t] = now->g[t+1] + a_value + nword->lscore;
    }
  }

  new->tre = NULL;

  if (r->lmtype == LM_DFA && !r->config->pass2.looktrellis_flag) {
    /* すべてのフレームにわたって最尤を探す */
    /* search for best trellis word throughout all frame */
    for(t = startt; t >= 0; t--) {
      tre = bt_binsearch_atom(backtrellis, t, (WORD_ID) word);
      if (tre == NULL) continue;
      totalscore = new->g[t] + tre->backscore;
      if (! hmminfo->multipath) {
        if (newphone->is_pseudo) {
          tmpp = outprob_cd(&(r->am->hmmwrk), t, &(newphone->body.pseudo->stateset[newphone->body.pseudo->state_num-2]), param);
        } else {
          tmpp = outprob_state(&(r->am->hmmwrk), t, newphone->body.defined->s[newphone->body.defined->state_num-2], param);
        }
        totalscore += tmpp;
      }
      if (new->score < totalscore) {
        new->score = totalscore;
        new->bestt = t;
        new->estimated_next_t = tre->begintime - 1;
        new->tre  =  tre;
      }
    }

    return;

  }
      
  /* この展開単語のトレリス上の終端時間の前後のみスキャンする
     前後に連続して存在するフレームについてのみ計算 */
  /* search for best trellis word only around the estimated time */
  /* 1. search forward */
  for(t = (nword->tre)->endtime; t >= 0; t--) {
    tre = bt_binsearch_atom(backtrellis, t, (WORD_ID) word);
    if (tre == NULL) break;     /* go to 2 if the trellis word disappear */
    totalscore = new->g[t] + tre->backscore;
    if (! hmminfo->multipath) {
      if (newphone->is_pseudo) {
        tmpp = outprob_cd(&(r->am->hmmwrk), t, &(newphone->body.pseudo->stateset[newphone->body.pseudo->state_num-2]), param);
      } else {
        tmpp = outprob_state(&(r->am->hmmwrk), t, newphone->body.defined->s[newphone->body.defined->state_num-2], param);
      }
      totalscore += tmpp;
    }
    if (new->score < totalscore) {
      new->score = totalscore;
      new->bestt = t;
      new->estimated_next_t = tre->begintime - 1;
      new->tre = tre;
    }
  }
  /* 2. search backward */
  for(t = (nword->tre)->endtime + 1; t <= startt; t++) {
    tre = bt_binsearch_atom(backtrellis, t, (WORD_ID) word);
    if (tre == NULL) break;     /* end if the trellis word disapper */
    totalscore = new->g[t] + tre->backscore;
    if (! hmminfo->multipath) {
      if (newphone->is_pseudo) {
        tmpp = outprob_cd(&(r->am->hmmwrk), t, &(newphone->body.pseudo->stateset[newphone->body.pseudo->state_num-2]), param);
      } else {
        tmpp = outprob_state(&(r->am->hmmwrk), t, newphone->body.defined->s[newphone->body.defined->state_num-2], param);
      }
      totalscore += tmpp;
    }
    if (new->score < totalscore) {
      new->score = totalscore;
      new->bestt = t;
      new->estimated_next_t = tre->begintime - 1;
      new->tre = tre;
    }
  }

}

/**********************************************************************/
/********** 初期仮説の生成                 ****************************/
/********** Generate an initial hypothesis ****************************/
/**********************************************************************/

void
start_word(NODE *new, NEXTWORD *nword, HTK_Param *param, RecogProcess *r)
{
  HMM_Logical *newphone;
  WORD_ID word;
  LOGPROB tmpp;
  int t;
  TRELLIS_ATOM *tre = NULL;

  BACKTRELLIS *backtrellis;
  WORD_INFO *winfo;
  int peseqlen;
  boolean ccd_flag;

  backtrellis = r->backtrellis;
  winfo = r->lm->winfo;
  peseqlen = r->peseqlen;
  ccd_flag = r->ccd_flag;

  /* initialize data */
  word = nword->id;
  new->score = LOG_ZERO;
  new->seqnum = 1;
  new->seq[0] = word;

  new->state = nword->next_state;
  new->totallscore = nword->lscore;

  /* cross-word triphone handling is not needed on startup */
  newphone = winfo->wseq[word][winfo->wlen[word]-1];
  if (ccd_flag) {
    new->last_ph = NULL;
    new->last_ph_sp_attached = FALSE;
  }
  new->lscore = nword->lscore;

  new->g[peseqlen-1] = nword->lscore;
  
  for (t=peseqlen-1; t>=0; t--) {
    tre = bt_binsearch_atom(backtrellis, t, word);
    if (tre != NULL) {
      if (r->graphout) {
        new->bestt = peseqlen-1;
      } else {
        new->bestt = t;
      }
      new->score = new->g[peseqlen-1] + tre->backscore;
      if (! r->am->hmminfo->multipath) {
        if (newphone->is_pseudo) {
          tmpp = outprob_cd(&(r->am->hmmwrk), peseqlen-1, &(newphone->body.pseudo->stateset[newphone->body.pseudo->state_num-2]), param);
        } else {
          tmpp = outprob_state(&(r->am->hmmwrk), peseqlen-1, newphone->body.defined->s[newphone->body.defined->state_num-2], param);
        }
        new->score += tmpp;
      }
      new->estimated_next_t = tre->begintime - 1;
      new->tre = tre;
      break;
    }
  }
  if (tre == NULL) {            /* no word in backtrellis */
    new->score = LOG_ZERO;
  }

}


void
last_next_word(NODE *now, NODE *new, HTK_Param *param, RecogProcess *r)
{
  cpy_node(new, now);
  /* 最終スコアを設定 */
  /* update the final score */
  if (r->am->hmminfo->multipath) {
    new->score = now->final_g;
  } else {
    new->score = now->g[0];
  }
}


#endif /* PASS2_STRICT_IWCD */

/* end of file */