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Avoid FP overflow in NormEvidenceOf (fixes issue #4257)

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Signed-off-by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Stefan Weil 2024-06-09 09:45:32 +02:00
parent b0a10bbe1a
commit dac6b18a47
1 changed files with 7 additions and 3 deletions
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10
src/classify/normmatch.cpp
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@ -105,13 +105,17 @@ float Classify::ComputeNormMatch(CLASS_ID ClassId, const FEATURE_STRUCT &feature
return (1 - NormEvidenceOf(Match));
}
float BestMatch = FLT_MAX;
LIST Protos = NormProtos->Protos[ClassId];
if (DebugMatch) {
tprintf("\nChar norm for class %s\n", unicharset.id_to_unichar(ClassId));
}
LIST Protos = NormProtos->Protos[ClassId];
if (Protos == nullptr) {
// Avoid FP overflow in NormEvidenceOf.
return 1.0f;
}
float BestMatch = FLT_MAX;
iterate(Protos) {
auto Proto = reinterpret_cast<PROTOTYPE *>(Protos->first_node());
float Delta = feature.Params[CharNormY] - Proto->Mean[CharNormY];