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Use square root of points for normalized score. #8572

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Merged
merged 2 commits into from
Feb 19, 2025
Merged

Use square root of points for normalized score. #8572

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4891b78
Use square root of points for normalized score.
isoos Feb 18, 2025
2ea5731
different normalization + comments
isoos Feb 18, 2025
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12 changes: 9 additions & 3 deletions app/lib/search/mem_index.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -313,9 +313,15 @@ class InMemoryPackageIndex {
_adjustedOverallScores = _documents.map((doc) {
final downloadScore = doc.downloadScore ?? 0.0;
final likeScore = doc.likeScore ?? 0.0;
final combinedScore = (downloadScore + likeScore) / 2;
final points = doc.grantedPoints / math.max(1, doc.maxPoints);
final overall = combinedScore * 0.5 + points * 0.5;
final popularityScore = (downloadScore + likeScore) / 2;

// prevent division by zero in case maxPoints is zero
final pointRatio = doc.grantedPoints / math.max(1, doc.maxPoints);
// force value between 0.0 and 1.0 in case we have bad points
// using square root to lower the differences between higher values
final pointScore = math.sqrt(math.max(0.0, math.min(1.0, pointRatio)));

final overall = popularityScore * 0.5 + pointScore * 0.5;
doc.overallScore = overall;
// adding a base score prevents later multiplication with zero
return 0.4 + 0.6 * overall;
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12 changes: 6 additions & 6 deletions app/test/search/mem_index_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -98,7 +98,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'nameMatches': ['async'],
'sdkLibraryHits': [],
'packageHits': [
{'package': 'async', 'score': closeTo(0.65, 0.01)},
{'package': 'async', 'score': closeTo(0.71, 0.01)},
],
});
});
Expand Down Expand Up @@ -143,8 +143,8 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'totalCount': 2,
'sdkLibraryHits': [],
'packageHits': [
{'package': 'async', 'score': closeTo(0.71, 0.01)},
{'package': 'http', 'score': closeTo(0.69, 0.01)},
{'package': 'async', 'score': closeTo(0.65, 0.01)},
],
});
});
Expand All @@ -157,7 +157,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'totalCount': 1,
'sdkLibraryHits': [],
'packageHits': [
{'package': 'async', 'score': closeTo(0.34, 0.01)},
{'package': 'async', 'score': closeTo(0.37, 0.01)},
],
});
});
Expand All @@ -183,7 +183,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'totalCount': 1,
'sdkLibraryHits': [],
'packageHits': [
{'package': 'async', 'score': closeTo(0.24, 0.01)},
{'package': 'async', 'score': closeTo(0.26, 0.01)},
],
});
});
Expand Down Expand Up @@ -335,7 +335,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'sdkLibraryHits': [],
'packageHits': [
{'package': 'http', 'score': closeTo(0.92, 0.01)},
{'package': 'async', 'score': closeTo(0.41, 0.01)},
{'package': 'async', 'score': closeTo(0.52, 0.01)},
],
});

Expand Down Expand Up @@ -422,7 +422,7 @@ server.dart adds a small, prescriptive server (PicoServer) that can be configure
'totalCount': 1,
'sdkLibraryHits': [],
'packageHits': [
{'package': 'async', 'score': closeTo(0.41, 0.01)},
{'package': 'async', 'score': closeTo(0.52, 0.01)},
],
});

Expand Down