Curve fitting that converges somewhat better

Now (in one test), 28 iterations instead of 1000.
This is for 2 decimals. I am still not quite happy about
the resulting ranks, need to take another look some day.

diff --git a/src/relevance.c b/src/relevance.c
index 9de591f..4282d8c 100644 (file)
--- a/src/relevance.c
+++ b/src/relevance.c
@@ -155,7 +155,6 @@ static void setup_norm_record( struct relevance *rel,  struct record_cluster *cl
         {
             struct record_metadata *md = record->metadata[norm->scorefield];
             rp->score = md->data.fnumber;
-            assert(rp->score>0); // ###
         }
         yaz_log(YLOG_LOG,"Got score for %d/%d : %f ",
                 norm->num, record->position, rp->score );
@@ -187,9 +186,11 @@ static double squaresum( struct norm_record *rp, double a, double b)
     return sum;
 }
 
+// For each client, normalize scores
 static void normalize_scores(struct relevance *rel)
 {
-    // For each client, normalize scores
+    const int maxiterations = 100;
+    const double enough = 100.0;  // sets the number of decimals we are happy with
     struct norm_client *norm;
     for ( norm = rel->norm; norm; norm = norm->next )
     {
@@ -205,56 +206,81 @@ static void normalize_scores(struct relevance *rel)
             double a,b;  // params to optimize
             double as,bs; // step sizes
             double chi;
+            char dir = 'a';
             // initial guesses for the parameters
             if ( range < 1e-6 ) // practically zero
                 range = norm->max;
             a = 1.0 / range;
             b = abs(norm->min);
-            as = a / 3;
-            bs = b / 3;
+            as = a / 10;
+            bs = b / 10;
             chi = squaresum( norm->records, a,b);
-            while (it++ < 100)  // safeguard against things not converging
+            while (it++ < maxiterations)  // safeguard against things not converging
             {
-                // optimize a
-                double plus = squaresum(norm->records, a+as, b);
-                double minus= squaresum(norm->records, a-as, b);
-                if ( plus < chi && plus < minus )
+                double aplus = squaresum(norm->records, a+as, b);
+                double aminus= squaresum(norm->records, a-as, b);
+                double bplus = squaresum(norm->records, a, b+bs);
+                double bminus= squaresum(norm->records, a, b-bs);
+                if ( aplus < chi && aplus < aminus && aplus < bplus && aplus < bminus)
                 {
                     a = a + as;
-                    chi = plus;
+                    chi = aplus;
+                    yaz_log(YLOG_LOG,"Fitting aplus it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                        it, a, as, b, bs, chi );
                 }
-                else if ( minus < chi && minus < plus )
+                else if ( aminus < chi && aminus < aplus && aminus < bplus && aminus < bminus)
                 {
                     a = a - as;
-                    chi = minus;
+                    chi = aminus;
+                    yaz_log(YLOG_LOG,"Fitting aminus it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                        it, a, as, b, bs, chi );
                 }
-                else
-                    as = as / 2;  
-                // optimize b
-                plus = squaresum(norm->records, a, b+bs);
-                minus= squaresum(norm->records, a, b-bs);
-                if ( plus < chi && plus < minus )
+                else if ( bplus < chi && bplus < aplus && bplus < aminus && bplus < bminus)
                 {
                     b = b + bs;
-                    chi = plus;
+                    chi = bplus;
+                    yaz_log(YLOG_LOG,"Fitting bplus it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                        it, a, as, b, bs, chi );
                 }
-                else if ( minus < chi && minus < plus )
+                else if ( bminus < chi && bminus < aplus && bminus < bplus && bminus < aminus)
                 {
                     b = b - bs;
-                    chi = minus;
+                    chi = bminus;
+                    yaz_log(YLOG_LOG,"Fitting bminus it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                        it, a, as, b, bs, chi );
                 }
                 else
-                    bs = bs / 2;
-                yaz_log(YLOG_LOG,"Fitting it=%d: a=%f / %f  b=%f / %f  chi = %f",
-                        it, a, as, b, bs, chi );
+                {
+                    if ( as > bs )
+                    {
+                        as = as / 2;
+                        yaz_log(YLOG_LOG,"Fitting step a it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                            it, a, as, b, bs, chi );
+                    }
+                    else
+                    {
+                        bs = bs / 2;
+                        yaz_log(YLOG_LOG,"Fitting step b it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                            it, a, as, b, bs, chi );
+                    }
+                }
                 norm->a = a;
                 norm->b = b;
-                if ( abs(as) * 1000.0 < abs(a) &&
-                     abs(bs) * 1000.0 < abs(b) )
+                if ( fabs(as) * enough < fabs(a) &&
+                     fabs(bs) * enough < fabs(b) ) {
+                    yaz_log(YLOG_LOG,"Fitting done: stopping loop at %d" , it );
                     break;  // not changing much any more
+
+                }
             }
+            yaz_log(YLOG_LOG,"Fitting done: it=%d: a=%f / %f  b=%f / %f  chi = %f",
+                        it-1, a, as, b, bs, chi );
+            yaz_log(YLOG_LOG,"  a: %f < %f %d",
+                    fabs(as)*enough, fabs(a), (fabs(as) * enough < fabs(a)) );
+            yaz_log(YLOG_LOG,"  b: %f < %f %d",
+                    fabs(bs)*enough, fabs(b), (fabs(bs) * enough < fabs(b)) );
         }
-        
+
         if ( norm->scorefield != scorefield_none )
         { // distribute the normalized scores to the records
             struct norm_record *nr = norm->records;

diff --git a/test/test_rank_12.res b/test/test_rank_12.res
index b40a464..ce588ec 100644 (file)
--- a/test/test_rank_12.res
+++ b/test/test_rank_12.res
@@ -6,93 +6,161 @@
 <start>0</start>
 <num>19</num>
 <hit>
- <md-title>Water management problems and challenges in India</md-title>
- <md-title-remainder>an analytical review</md-title-remainder>
+ <md-title>District water supply plan</md-title>
  <md-date>2000</md-date>
- <md-author>Dinesh Kumar, M</md-author>
+ <md-description>[1] [No special title] -- [2] Appendixes</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="1554355631">
-  <md-title>Water management problems and challenges in India</md-title>
-  <md-title-remainder>an analytical review</md-title-remainder>
+    name="LOC Solr Test" checksum="552609001">
+  <md-title>District water supply plan</md-title>
   <md-date>2000</md-date>
-  <md-author>Dinesh Kumar, M</md-author>
+  <md-description>[1] [No special title] -- [2] Appendixes</md-description>
   <md-medium>book</md-medium>
-  <md-score>2.304635</md-score>
+  <md-score>1.928196</md-score>
  </location>
  <count>1</count>
- <relevance>2000</relevance>
- <recid>content: title water management problems and challenges in india author dinesh kumar m medium book</recid>
+ <relevance>3526</relevance>
+ <recid>content: title district water supply plan medium book</recid>
 </hit>
 <hit>
- <md-title>The magic of water</md-title>
- <md-title-remainder>reflection and transparency at the water&apos;s edge</md-title-remainder>
+ <md-title>Proposition 13</md-title>
+ <md-title-remainder>Safe Drinking Water, Clean Water, Watershed Protection, and Flood Protection Act</md-title-remainder>
  <md-date>2000</md-date>
- <md-author>Hochschwender, Ted</md-author>
+ <md-description>&quot;March 2000.&quot;</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="3168968100">
-  <md-title>The magic of water</md-title>
-  <md-title-remainder>reflection and transparency at the water&apos;s edge</md-title-remainder>
+    name="LOC Solr Test" checksum="3232963828">
+  <md-title>Proposition 13</md-title>
+  <md-title-remainder>Safe Drinking Water, Clean Water, Watershed Protection, and Flood Protection Act</md-title-remainder>
   <md-date>2000</md-date>
-  <md-author>Hochschwender, Ted</md-author>
+  <md-description>&quot;March 2000.&quot;</md-description>
   <md-medium>book</md-medium>
-  <md-score>2.231453</md-score>
+  <md-score>1.928196</md-score>
  </location>
  <count>1</count>
- <relevance>1939</relevance>
- <recid>content: title the magic of water author hochschwender ted medium book</recid>
+ <relevance>3526</relevance>
+ <recid>content: title proposition medium book</recid>
 </hit>
 <hit>
- <md-title>Water</md-title>
+ <md-title>1999 wastewater and drinking water user charge survey</md-title>
  <md-date>1999</md-date>
- <md-author>De Villiers, Marq</md-author>
+ <md-description>&quot;December, 1999.&quot;</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="488613273">
-  <md-title>Water</md-title>
+    name="LOC Solr Test" checksum="1618351359">
+  <md-title>1999 wastewater and drinking water user charge survey</md-title>
   <md-date>1999</md-date>
-  <md-author>De Villiers, Marq</md-author>
+  <md-description>Cover title</md-description>
+  <md-description>&quot;December, 1999.&quot;</md-description>
   <md-medium>book</md-medium>
-  <md-score>2.186368</md-score>
+  <md-score>1.928196</md-score>
  </location>
  <count>1</count>
- <relevance>1902</relevance>
- <recid>content: title water author de villiers marq medium book</recid>
+ <relevance>3526</relevance>
+ <recid>content: title wastewater and drinking water user charge survey medium book</recid>
 </hit>
 <hit>
- <md-title>Water use for public water supply in Michigan, 1998</md-title>
+ <md-title>Water in press, 1997</md-title>
+ <md-title-remainder>an index of news items on water resources selected from leading news papers</md-title-remainder>
+ <md-date>1998</md-date>
+ <md-description>With reference to India</md-description>
+ <md-medium>book</md-medium>
+ <location id="LOC Solr Test"
+    name="LOC Solr Test" checksum="2167221470">
+  <md-title>Water in press, 1997</md-title>
+  <md-title-remainder>an index of news items on water resources selected from leading news papers</md-title-remainder>
+  <md-date>1998</md-date>
+  <md-description>Includes index</md-description>
+  <md-description>With reference to India</md-description>
+  <md-medium>book</md-medium>
+  <md-score>1.928196</md-score>
+ </location>
+ <count>1</count>
+ <relevance>3526</relevance>
+ <recid>content: title water in press medium book</recid>
+</hit>
+<hit>
+ <md-title>Who governs water?</md-title>
+ <md-title-remainder>the politics of water resource management</md-title-remainder>
+ <md-date>1999</md-date>
+ <md-author>Frey, Hans</md-author>
+ <md-medium>book</md-medium>
+ <location id="LOC Solr Test"
+    name="LOC Solr Test" checksum="3738890">
+  <md-title>Who governs water?</md-title>
+  <md-title-remainder>the politics of water resource management</md-title-remainder>
+  <md-date>1999</md-date>
+  <md-author>Frey, Hans</md-author>
+  <md-medium>book</md-medium>
+  <md-score>1.928196</md-score>
+ </location>
+ <count>1</count>
+ <relevance>3526</relevance>
+ <recid>content: title who governs water author frey hans medium book</recid>
+</hit>
+<hit>
+ <md-title>A Primer on fresh water</md-title>
+ <md-title-remainder>questions and answers</md-title-remainder>
  <md-date>2000</md-date>
- <md-description>&quot;January 3, 2000.&quot;</md-description>
+ <md-description>Issued also in French under title: Notions élémentaires sur l&apos;eau douce : questions et réponses</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="2103225742">
-  <md-title>Water use for public water supply in Michigan, 1998</md-title>
+    name="LOC Solr Test" checksum="2684093717">
+  <md-title>A Primer on fresh water</md-title>
+  <md-title-remainder>questions and answers</md-title-remainder>
   <md-date>2000</md-date>
-  <md-description>&quot;January 3, 2000.&quot;</md-description>
+  <md-description>Issued also in French under title: Notions élémentaires sur l&apos;eau douce : questions et réponses</md-description>
+  <md-description>Includes index</md-description>
   <md-medium>book</md-medium>
-  <md-score>2.186368</md-score>
+  <md-score>2.016555</md-score>
  </location>
  <count>1</count>
- <relevance>1902</relevance>
- <recid>content: title water use for public water supply in michigan medium book</recid>
+ <relevance>2319</relevance>
+ <recid>content: title a primer on fresh water medium book</recid>
 </hit>
 <hit>
- <md-title>Report to the IUCN on water demand management country study</md-title>
- <md-title-remainder>Namibia</md-title-remainder>
- <md-date>1999</md-date>
+ <md-title>Water quality assessment of the State Water Project, 1996-97</md-title>
+ <md-date>1999-2000</md-date>
+ <md-description>&quot;September 1999.&quot;</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="3717838211">
-  <md-title>Report to the IUCN on water demand management country study</md-title>
-  <md-title-remainder>Namibia</md-title-remainder>
+    name="LOC Solr Test" checksum="3749836075">
+  <md-title>Water quality assessment of the State Water Project, 1996-97</md-title>
   <md-date>1999</md-date>
+  <md-description>Cover title</md-description>
+  <md-description>&quot;September 1999.&quot;</md-description>
   <md-medium>book</md-medium>
-  <md-score>2.114981</md-score>
+  <md-score>2.016555</md-score>
+ </location>
+ <location id="LOC Solr Test"
+    name="LOC Solr Test" checksum="1069481248">
+  <md-title>Water quality assessment of the State Water Project, 1998-99</md-title>
+  <md-date>2000</md-date>
+  <md-description>Cover title</md-description>
+  <md-description>&quot;July 2000.&quot;</md-description>
+  <md-medium>book</md-medium>
+  <md-score>2.016555</md-score>
+ </location>
+ <count>2</count>
+ <relevance>2319</relevance>
+ <recid>content: title water quality assessment of the state water project medium book</recid>
+</hit>
+<hit>
+ <md-title>Wonderful water</md-title>
+ <md-date>2001</md-date>
+ <md-author>Glover, David</md-author>
+ <md-medium>book</md-medium>
+ <location id="LOC Solr Test"
+    name="LOC Solr Test" checksum="2135223606">
+  <md-title>Wonderful water</md-title>
+  <md-date>2001</md-date>
+  <md-author>Glover, David</md-author>
+  <md-medium>book</md-medium>
+  <md-score>2.037029</md-score>
  </location>
  <count>1</count>
- <relevance>1843</relevance>
- <recid>content: title report to the iucn on water demand management country study medium book</recid>
+ <relevance>2039</relevance>
+ <recid>content: title wonderful water author glover david medium book</recid>
 </hit>
 <hit>
  <md-title>Evaluation and control of water pollution in Bhavani Basin</md-title>
@@ -111,7 +179,7 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title evaluation and control of water pollution in bhavani basin medium book</recid>
 </hit>
 <hit>
@@ -130,7 +198,7 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title unsia water cluster medium book</recid>
 </hit>
 <hit>
@@ -147,7 +215,7 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title water and water supplies author thresh john clough medium book</recid>
 </hit>
 <hit>
@@ -166,7 +234,7 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title water author majeed abdul medium book</recid>
 </hit>
 <hit>
@@ -185,7 +253,7 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title water law author fisher d e medium book</recid>
 </hit>
 <hit>
@@ -202,164 +270,96 @@
   <md-score>2.061328</md-score>
  </location>
  <count>1</count>
- <relevance>1798</relevance>
+ <relevance>1707</relevance>
  <recid>content: title water technology management medium book</recid>
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- <md-title>Wonderful water</md-title>
- <md-date>2001</md-date>
- <md-author>Glover, David</md-author>
- <md-medium>book</md-medium>
- <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="2135223606">
-  <md-title>Wonderful water</md-title>
-  <md-date>2001</md-date>
-  <md-author>Glover, David</md-author>
-  <md-medium>book</md-medium>
-  <md-score>2.037029</md-score>
- </location>
- <count>1</count>
- <relevance>1778</relevance>
- <recid>content: title wonderful water author glover david medium book</recid>
-</hit>
-<hit>
- <md-title>A Primer on fresh water</md-title>
- <md-title-remainder>questions and answers</md-title-remainder>
- <md-date>2000</md-date>
- <md-description>Issued also in French under title: Notions élémentaires sur l&apos;eau douce : questions et réponses</md-description>
+ <md-title>Report to the IUCN on water demand management country study</md-title>
+ <md-title-remainder>Namibia</md-title-remainder>
+ <md-date>1999</md-date>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="2684093717">
-  <md-title>A Primer on fresh water</md-title>
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-  <md-description>Issued also in French under title: Notions élémentaires sur l&apos;eau douce : questions et réponses</md-description>
-  <md-description>Includes index</md-description>
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+  <md-title>Report to the IUCN on water demand management country study</md-title>
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-  <md-score>2.016555</md-score>
+  <md-score>2.114981</md-score>
  </location>
  <count>1</count>
- <relevance>1761</relevance>
- <recid>content: title a primer on fresh water medium book</recid>
+ <relevance>974</relevance>
+ <recid>content: title report to the iucn on water demand management country study medium book</recid>
 </hit>
 <hit>
- <md-title>Water quality assessment of the State Water Project, 1996-97</md-title>
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- <md-description>&quot;September 1999.&quot;</md-description>
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+ <md-date>1999</md-date>
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  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="3749836075">
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-  <md-date>2000</md-date>
-  <md-description>Cover title</md-description>
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   <md-medium>book</md-medium>
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+  <md-score>2.186368</md-score>
  </location>
- <count>2</count>
- <relevance>1761</relevance>
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+ <count>1</count>
+ <relevance>0</relevance>
+ <recid>content: title water author de villiers marq medium book</recid>
 </hit>
 <hit>
- <md-title>District water supply plan</md-title>
+ <md-title>Water use for public water supply in Michigan, 1998</md-title>
  <md-date>2000</md-date>
- <md-description>[1] [No special title] -- [2] Appendixes</md-description>
+ <md-description>&quot;January 3, 2000.&quot;</md-description>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
-    name="LOC Solr Test" checksum="552609001">
-  <md-title>District water supply plan</md-title>
+    name="LOC Solr Test" checksum="2103225742">
+  <md-title>Water use for public water supply in Michigan, 1998</md-title>
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+  <md-description>&quot;January 3, 2000.&quot;</md-description>
   <md-medium>book</md-medium>
-  <md-score>1.928196</md-score>
+  <md-score>2.186368</md-score>
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- <relevance>1688</relevance>
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+ <relevance>0</relevance>
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 </hit>
 <hit>
- <md-title>Proposition 13</md-title>
- <md-title-remainder>Safe Drinking Water, Clean Water, Watershed Protection, and Flood Protection Act</md-title-remainder>
+ <md-title>The magic of water</md-title>
+ <md-title-remainder>reflection and transparency at the water&apos;s edge</md-title-remainder>
  <md-date>2000</md-date>
- <md-description>&quot;March 2000.&quot;</md-description>
+ <md-author>Hochschwender, Ted</md-author>
  <md-medium>book</md-medium>
  <location id="LOC Solr Test"
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\ No newline at end of file