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(index) Tune ranking for verbatim matches in the title, rewarding shorter titles

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This commit is contained in:
Viktor Lofgren 2024-08-03 14:07:02 +02:00
parent e48f52faba
commit ec5a17ad13
2 changed files with 22 additions and 1 deletions
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16
code/index/index-forward/java/nu/marginalia/index/forward/spans/DocumentSpan.java
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@ -71,6 +71,22 @@ public class DocumentSpan {
return startsEnds.iterator();
}
public int length() {
if (null == startsEnds) {
return 0;
}
int len = 0;
var iter = startsEnds.iterator();
while (iter.hasNext()) {
len -= iter.nextInt();
len += iter.nextInt();
}
return len;
}
public int size() {
return startsEnds.valueCount() / 2;
}

7
code/index/java/nu/marginalia/index/results/IndexResultScoreCalculator.java
View File

@ -197,13 +197,18 @@ public class IndexResultScoreCalculator {
temporalBias = 0;
}
final int titleLength = spans.title.length();
float coherenceScore = 0.f;
// Calculate a bonus for keyword coherences when large ones exist
int largestOptional = coherences.largestOptional();
if (largestOptional >= 2) {
if (largestOptional == coherences.testOptional(positions, spans.title)) {
coherenceScore = 2.0f * largestOptional;
// verbatim title match
coherenceScore = 4.0f * largestOptional;
// additional bonus if the match is most of the title's length
coherenceScore += 2.f * largestOptional / titleLength;
}
else if (largestOptional == coherences.testOptional(positions, spans.heading)) {
coherenceScore = 1.5f * largestOptional;