/*
- * Copyright (C) 1994-1995, Index Data I/S
+ * Copyright (C) 1994-1997, Index Data I/S
* All rights reserved.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: rsrel.c,v $
- * Revision 1.7 1995-10-12 12:41:57 adam
+ * Revision 1.22 1997-12-18 10:54:25 adam
+ * New method result set method rs_hits that returns the number of
+ * hits in result-set (if known). The ranked result set returns real
+ * number of hits but only when not combined with other operands.
+ *
+ * Revision 1.21 1997/11/18 10:05:08 adam
+ * Changed character map facility so that admin can specify character
+ * mapping files for each register type, w, p, etc.
+ *
+ * Revision 1.20 1997/10/31 12:37:55 adam
+ * Code calls xfree() instead of free().
+ *
+ * Revision 1.19 1997/10/01 11:44:06 adam
+ * Small improvement of new ranking.
+ *
+ * Revision 1.18 1997/09/24 13:36:41 adam
+ * More work on new ranking algorithm.
+ *
+ * Revision 1.17 1997/09/22 12:39:07 adam
+ * Added get_pos method for the ranked result sets.
+ *
+ * Revision 1.16 1997/09/17 12:19:23 adam
+ * Zebra version corresponds to YAZ version 1.4.
+ * Changed Zebra server so that it doesn't depend on global common_resource.
+ *
+ * Revision 1.15 1997/09/09 13:38:16 adam
+ * Partial port to WIN95/NT.
+ *
+ * Revision 1.14 1996/11/08 11:15:58 adam
+ * Compressed isam fully supported.
+ *
+ * Revision 1.13 1996/10/29 13:55:26 adam
+ * Include of zebrautl.h instead of alexutil.h.
+ *
+ * Revision 1.12 1996/10/08 13:00:40 adam
+ * Bug fix: result sets with ranked operands in boolean operations weren't
+ * sorted.
+ *
+ * Revision 1.11 1996/10/07 16:05:29 quinn
+ * Work.
+ *
+ * Revision 1.9 1995/12/11 09:15:26 adam
+ * New set types: sand/sor/snot - ranked versions of and/or/not in
+ * ranked/semi-ranked result sets.
+ * Note: the snot not finished yet.
+ * New rset member: flag.
+ * Bug fix: r_delete in rsrel.c did free bad memory block.
+ *
+ * Revision 1.8 1995/12/05 11:25:45 adam
+ * Doesn't include math.h.
+ *
+ * Revision 1.7 1995/10/12 12:41:57 adam
* Private info (buf) moved from struct rset_control to struct rset.
* Bug fixes in relevance.
*
#include <stdio.h>
#include <stdlib.h>
-#include <math.h>
+#include <string.h>
#include <assert.h>
#include <isam.h>
+#include <isamc.h>
#include <rsrel.h>
-#include <alexutil.h>
+#include <zebrautl.h>
-static void *r_create(const struct rset_control *sel, void *parms);
+static void *r_create(const struct rset_control *sel, void *parms,
+ int *flags);
static RSFD r_open (RSET ct, int flag);
static void r_close (RSFD rfd);
static void r_delete (RSET ct);
static void r_rewind (RSFD rfd);
static int r_count (RSET ct);
+static int r_hits (RSET ct, void *oi);
static int r_read (RSFD rfd, void *buf);
static int r_write (RSFD rfd, const void *buf);
static int r_score (RSFD rfd, int *score);
static const rset_control control =
{
- "relevance set type",
+ "relevance",
r_create,
r_open,
r_close,
r_delete,
r_rewind,
r_count,
+ r_hits,
r_read,
r_write,
r_score
int key_size;
int max_rec;
int no_rec;
+ int hits; /* hits count */
int (*cmp)(const void *p1, const void *p2);
+ int (*get_pos)(const void *p);
char *key_buf; /* key buffer */
float *score_buf; /* score buffer */
int *sort_idx; /* score sorted index */
- int *sysno_idx; /* sysno sorted index (ring buffer) */
+ int *sysno_idx; /* sysno sorted index (ring buffer) */
struct rset_rel_rfd *rfd_list;
};
{
int idx, i, j;
+ (info->hits)++;
for (i = 0; i<info->no_rec; i++)
{
idx = info->sort_idx[i];
qsort_info->key_buf + i2*qsort_info->key_size);
}
+#define NEW_RANKING 0
+
+#define SCORE_SHOW 0.0 /* base score for showing up */
+#define SCORE_COOC 0.3 /* component dependent on co-oc */
+#define SCORE_DYN (1-(SCORE_SHOW+SCORE_COOC)) /* dynamic component of score */
+
static void relevance (struct rset_rel_info *info, rset_relevance_parms *parms)
{
char **isam_buf;
char *isam_tmp_buf;
int *isam_r;
- int *max_tf;
- ISPT *isam_pt;
- double *wgt;
+ int *max_tf, *tf;
+
+ int *pos_tf = NULL;
+ int score_sum = 0;
+ int no_occur = 0;
+ char *isam_prev_buf = NULL;
+ int fact1, fact2;
+
+ ISPT *isam_pt = NULL;
+ ISAMC_PP *isamc_pp = NULL;
int i;
logf (LOG_DEBUG, "relevance");
isam_buf = xmalloc (parms->no_isam_positions * sizeof(*isam_buf));
isam_r = xmalloc (sizeof (*isam_r) * parms->no_isam_positions);
- isam_pt = xmalloc (sizeof (*isam_pt) * parms->no_isam_positions);
+ if (parms->is)
+ isam_pt = xmalloc (sizeof (*isam_pt) * parms->no_isam_positions);
+ else if (parms->isc)
+ isamc_pp = xmalloc (sizeof (*isamc_pp) * parms->no_isam_positions);
+ else
+ {
+ logf (LOG_FATAL, "No isamc or isam in rs_rel");
+ abort ();
+ }
isam_tmp_buf = xmalloc (info->key_size);
- max_tf = xmalloc (sizeof (*max_tf) * parms->no_isam_positions);
- wgt = xmalloc (sizeof (*wgt) * parms->no_isam_positions);
+ max_tf = xmalloc (sizeof (*max_tf) * parms->no_terms);
+ tf = xmalloc (sizeof (*tf) * parms->no_terms);
+ for (i = 0; i<parms->no_terms; i++)
+ max_tf[i] = 0;
for (i = 0; i<parms->no_isam_positions; i++)
{
isam_buf[i] = xmalloc (info->key_size);
- isam_pt[i] = is_position (parms->is, parms->isam_positions[i]);
- max_tf [i] = is_numkeys (isam_pt[i]);
- isam_r[i] = is_readkey (isam_pt[i], isam_buf[i]);
- logf (LOG_DEBUG, "max tf %d = %d", i, max_tf[i]);
- }
- while (1)
- {
- int min = -1, i;
- double score;
-
- /* find min with lowest sysno */
- for (i = 0; i<parms->no_isam_positions; i++)
- if (isam_r[i] &&
- (min < 0 || (*parms->cmp)(isam_buf[i], isam_buf[min]) < 1))
- min = i;
- if (min < 0)
- break;
- memcpy (isam_tmp_buf, isam_buf[min], info->key_size);
- /* calculate for all with those sysno */
- for (i = 0; i<parms->no_isam_positions; i++)
+ if (isam_pt)
{
- int r;
-
- if (isam_r[i])
- r = (*parms->cmp)(isam_buf[i], isam_tmp_buf);
- else
- r = 2;
- if (r > 1 || r < -1)
- wgt[i] = 0.0;
- else
- {
- int tf = 0;
- do
- {
- tf++;
- isam_r[i] = is_readkey (isam_pt[i], isam_buf[i]);
- } while (isam_r[i] &&
- (*parms->cmp)(isam_buf[i], isam_tmp_buf) <= 1);
- wgt[i] = 0.1+tf*0.9/max_tf[i];
- }
+ isam_pt[i] = is_position (parms->is, parms->isam_positions[i]);
+ max_tf [parms->term_no[i]] = is_numkeys (isam_pt[i]);
+ isam_r[i] = is_readkey (isam_pt[i], isam_buf[i]);
+ }
+ else if (isamc_pp)
+ {
+ isamc_pp[i] = isc_pp_open (parms->isc, parms->isam_positions[i]);
+ max_tf [parms->term_no[i]] = isc_pp_num (isamc_pp[i]);
+ isam_r[i] = isc_pp_read (isamc_pp[i], isam_buf[i]);
}
- /* calculate relevance value */
- score = 0.0;
- for (i = 0; i<parms->no_isam_positions; i++)
- score += wgt[i];
- /* if value is in the top score, then save it - don't emit yet */
- add_rec (info, score, isam_tmp_buf);
+ logf (LOG_DEBUG, "max tf %d = %d", i, max_tf[i]);
}
+ switch (parms->method)
+ {
+ case RSREL_METHOD_B:
+ while (1)
+ {
+ int r, min = -1;
+ int pos = 0;
+ for (i = 0; i<parms->no_isam_positions; i++)
+ if (isam_r[i] &&
+ (min < 0 ||
+ (r = (*parms->cmp)(isam_buf[i], isam_buf[min])) < 1))
+ min = i;
+ if (!isam_prev_buf)
+ {
+ pos_tf = xmalloc (sizeof(*pos_tf) * parms->no_isam_positions);
+ isam_prev_buf = xmalloc (info->key_size);
+ fact1 = 100000/parms->no_isam_positions;
+ fact2 = 100000/
+ (parms->no_isam_positions*parms->no_isam_positions);
+
+ no_occur = score_sum = 0;
+ memcpy (isam_prev_buf, isam_buf[min], info->key_size);
+ for (i = 0; i<parms->no_isam_positions; i++)
+ pos_tf[i] = -10;
+ }
+ else if (min < 0 ||
+ (*parms->cmp)(isam_buf[min], isam_prev_buf) > 1)
+ {
+ logf (LOG_LOG, "final occur = %d ratio=%d",
+ no_occur, score_sum / no_occur);
+ add_rec (info, score_sum / (10000.0*no_occur), isam_prev_buf);
+ if (min < 0)
+ break;
+ no_occur = score_sum = 0;
+ memcpy (isam_prev_buf, isam_buf[min], info->key_size);
+ for (i = 0; i<parms->no_isam_positions; i++)
+ pos_tf[i] = -10;
+ }
+ pos = (*parms->get_pos)(isam_buf[min]);
+ logf (LOG_LOG, "pos=%d", pos);
+ for (i = 0; i<parms->no_isam_positions; i++)
+ {
+ int d = pos - pos_tf[i];
+
+ no_occur++;
+ if (pos_tf[i] < 0 && i != min)
+ continue;
+ if (d < 10)
+ d = 10;
+ if (i == min)
+ score_sum += fact2 / d;
+ else
+ score_sum += fact1 / d;
+ }
+ pos_tf[min] = pos;
+ logf (LOG_LOG, "score_sum = %d", score_sum);
+ i = min;
+ if (isam_pt)
+ isam_r[i] = is_readkey (isam_pt[i], isam_buf[i]);
+ else if (isamc_pp)
+ isam_r[i] = isc_pp_read (isamc_pp[i], isam_buf[i]);
+ } /* while */
+ xfree (isam_prev_buf);
+ xfree (pos_tf);
+ break;
+ case RSREL_METHOD_A:
+ while (1)
+ {
+ int min = -1, i, r;
+ double score;
+ int co_oc, last_term; /* Number of co-occurrences */
+
+ last_term = -1;
+ /* find min with lowest sysno */
+ for (i = 0; i<parms->no_isam_positions; i++)
+ {
+ if (isam_r[i] &&
+ (min < 0
+ || (r = (*parms->cmp)(isam_buf[i], isam_buf[min])) < 2))
+ {
+ min = i;
+ co_oc = 1;
+ }
+ else if (!r && last_term != parms->term_no[i])
+ co_oc++; /* new occurrence */
+ last_term = parms->term_no[i];
+ }
+
+ if (min < 0)
+ break;
+ memcpy (isam_tmp_buf, isam_buf[min], info->key_size);
+ /* calculate for all with those sysno */
+ for (i = 0; i < parms->no_terms; i++)
+ tf[i] = 0;
+ for (i = 0; i<parms->no_isam_positions; i++)
+ {
+ int r;
+
+ if (isam_r[i])
+ r = (*parms->cmp)(isam_buf[i], isam_tmp_buf);
+ else
+ r = 2;
+ if (r <= 1 && r >= -1)
+ {
+ do
+ {
+ tf[parms->term_no[i]]++;
+ if (isam_pt)
+ isam_r[i] = is_readkey (isam_pt[i], isam_buf[i]);
+ else if (isamc_pp)
+ isam_r[i] = isc_pp_read (isamc_pp[i], isam_buf[i]);
+ } while (isam_r[i] &&
+ (*parms->cmp)(isam_buf[i], isam_tmp_buf) <= 1);
+ }
+ }
+ /* calculate relevance value */
+ score = 0.0;
+ for (i = 0; i<parms->no_terms; i++)
+ if (tf[i])
+ score += SCORE_SHOW + SCORE_COOC*co_oc/parms->no_terms +
+ SCORE_DYN*tf[i]/max_tf[i];
+ /* if value is in the top score, then save it - don't emit yet */
+ add_rec (info, score/parms->no_terms, isam_tmp_buf);
+ } /* while */
+ break;
+ } /* switch */
for (i = 0; i<info->no_rec; i++)
info->sysno_idx[i] = i;
qsort_info = info;
qsort (info->sysno_idx, info->no_rec, sizeof(*info->sysno_idx), qcomp);
for (i = 0; i<parms->no_isam_positions; i++)
{
- is_pt_free (isam_pt[i]);
+ if (isam_pt)
+ is_pt_free (isam_pt[i]);
+ if (isamc_pp)
+ isc_pp_close (isamc_pp[i]);
xfree (isam_buf[i]);
}
xfree (max_tf);
xfree (isam_buf);
xfree (isam_r);
xfree (isam_pt);
- xfree (wgt);
+ xfree (isamc_pp);
+ xfree(tf);
}
-static void *r_create (const struct rset_control *sel, void *parms)
+static void *r_create (const struct rset_control *sel, void *parms,
+ int *flags)
{
rset_relevance_parms *r_parms = parms;
struct rset_rel_info *info;
+ *flags |= RSET_FLAG_RANKED;
info = xmalloc (sizeof(struct rset_rel_info));
info->key_size = r_parms->key_size;
assert (info->key_size > 1);
info->max_rec = r_parms->max_rec;
assert (info->max_rec > 1);
info->cmp = r_parms->cmp;
+ info->get_pos = r_parms->get_pos;
info->key_buf = xmalloc (info->key_size * info->max_rec);
info->score_buf = xmalloc (sizeof(*info->score_buf) * info->max_rec);
info->sort_idx = xmalloc (sizeof(*info->sort_idx) * info->max_rec);
info->sysno_idx = xmalloc (sizeof(*info->sysno_idx) * info->max_rec);
info->no_rec = 0;
+ info->hits = 0;
info->rfd_list = NULL;
relevance (info, r_parms);
if (*rfdp == rfd)
{
*rfdp = (*rfdp)->next;
- free (rfd);
+ xfree (rfd);
return;
}
logf (LOG_FATAL, "r_close but no rfd match!");
xfree (info->sort_idx);
xfree (info->sysno_idx);
xfree (info);
- xfree (ct);
}
static void r_rewind (RSFD rfd)
return info->no_rec;
}
+static int r_hits (RSET ct, void *oi)
+{
+ struct rset_rel_info *info = ct->buf;
+
+ return info->hits;
+}
+
static int r_read (RSFD rfd, void *buf)
{
struct rset_rel_rfd *p = rfd;
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