X-Git-Url: http://jsfdemo.indexdata.com/?a=blobdiff_plain;f=rset%2Frsrel.c;h=9fc32d4d81b30aededb67cc7e0f7ceed9f6fef32;hb=aebdede4bcc1dfe05728dac36b51a1cda85cc70e;hp=4faed5baf647e0bd318d9f048efd783312b23716;hpb=7eefa059dbe0c2d4ba24060421940df637d9cca8;p=idzebra-moved-to-github.git

diff --git a/rset/rsrel.c b/rset/rsrel.c
index 4faed5b..9fc32d4 100644
--- a/rset/rsrel.c
+++ b/rset/rsrel.c
@@ -4,12 +4,23 @@
  * Sebastian Hammer, Adam Dickmeiss
  *
  * $Log: rsrel.c,v $
- * Revision 1.1  1995-09-08 14:52:42  adam
+ * Revision 1.4  1995-09-14 07:48:56  adam
+ * Other score calculation.
+ *
+ * Revision 1.3  1995/09/11  15:23:40  adam
+ * More work on relevance search.
+ *
+ * Revision 1.2  1995/09/11  13:09:41  adam
+ * More work on relevance feedback.
+ *
+ * Revision 1.1  1995/09/08  14:52:42  adam
  * Work on relevance feedback.
  *
  */
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
 #include <assert.h>
 
 #include <isam.h>
@@ -46,8 +57,9 @@ struct rset_rel_info {
     int     max_rec;
     int     no_rec;
     int     (*cmp)(const void *p1, const void *p2);
-    void    *key_buf;
-    int     *score_buf;
+    char    *key_buf;
+    float   *score_buf;
+    int     *sort_idx;
 
     struct rset_rel_rfd *rfd_list;
 };
@@ -58,28 +70,119 @@ struct rset_rel_rfd {
     struct rset_rel_info *info;
 };
 
+static void add_rec (struct rset_rel_info *info, double score, void *key)
+{
+    int idx, i, j;
+
+    logf (LOG_DEBUG, "add %f", score);
+    for (i = 0; i<info->no_rec; i++)
+    {
+        idx = info->sort_idx[i];
+        if (score <= info->score_buf[idx])
+            break;
+    }
+    if (info->no_rec < info->max_rec)
+    {
+        for (j = info->no_rec; j > i; --j)
+            info->sort_idx[j] = info->sort_idx[j-1];
+        idx = info->sort_idx[j] = info->no_rec;
+        ++(info->no_rec);
+    }
+    else if (i == 0)
+        return;
+    else
+    {
+        idx = info->sort_idx[0];
+
+        --i;
+        for (j = 0; j < i; ++j)
+            info->sort_idx[j] = info->sort_idx[j+1];
+        info->sort_idx[j] = idx;
+    }
+    memcpy (info->key_buf + idx*info->key_size, key, info->key_size);
+    info->score_buf[idx] = score;
+}
+
 static void relevance (struct rset_rel_info *info, rset_relevance_parms *parms)
 {
-    char *isam_buf;
+    char **isam_buf;
+    char *isam_tmp_buf;
     int  *isam_r;
+    int  *max_tf;
     ISPT *isam_pt;
+    double *wgt;
     int i;
 
-    isam_buf = xmalloc (info->key_size * parms->no_isam_positions);
+    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);
+    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);
 
     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]);
-        isam_r[i] = is_readkey (isam_pt[i], isam_buf + i*info->key_size);
+        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++)
+        {
+            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];
+            }
+        }
+        /* 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);
+    }
     for (i = 0; i<parms->no_isam_positions; i++)
+    {
         is_pt_free (isam_pt[i]);
+        xfree (isam_buf[i]);
+    }
+    xfree (max_tf);
+    xfree (isam_tmp_buf);
     xfree (isam_buf);
     xfree (isam_r);
     xfree (isam_pt);
+    xfree (wgt);
 }
 
 static rset_control *r_create (const struct rset_control *sel, void *parms)
@@ -101,6 +204,7 @@ static rset_control *r_create (const struct rset_control *sel, void *parms)
 
     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->no_rec = 0;
     info->rfd_list = NULL;
 
@@ -121,7 +225,7 @@ static RSFD r_open (rset_control *ct, int wflag)
     rfd = xmalloc (sizeof(*rfd));
     rfd->next = info->rfd_list;
     info->rfd_list = rfd;
-    rfd->position = 0;
+    rfd->position = info->no_rec;
     rfd->info = info;
     return rfd;
 }
@@ -149,13 +253,17 @@ static void r_delete (rset_control *ct)
     assert (info->rfd_list == NULL);
     xfree (info->key_buf);
     xfree (info->score_buf);
+    xfree (info->sort_idx);
     xfree (info);
     xfree (ct);
 }
 
 static void r_rewind (RSFD rfd)
 {
-    ((struct rset_rel_rfd*) rfd)->position = 0;
+    struct rset_rel_rfd *p = rfd;
+    struct rset_rel_info *info = p->info;
+    
+    p->position = info->no_rec;
 }
 
 static int r_count (rset_control *ct)
@@ -170,14 +278,14 @@ static int r_read (RSFD rfd, void *buf)
     struct rset_rel_rfd *p = rfd;
     struct rset_rel_info *info = p->info;
 
-    if (p->position >= info->max_rec)
+    if (p->position <= 0)
         return 0;
-    memcpy ((char*) buf + sizeof(*info->score_buf),
-            (char*) info->key_buf + info->key_size * p->position,
-            info->key_size);
+    --(p->position);
+    logf (LOG_DEBUG, "score: %f",
+          info->score_buf[info->sort_idx[p->position]]);
     memcpy ((char*) buf,
-            info->score_buf + p->position, sizeof(*info->score_buf));
-    ++(p->position);
+            info->key_buf + info->key_size * info->sort_idx[p->position],
+            info->key_size);
     return 1;
 }