[runtime] cosine score normalization (wenet-e2e#408)

cdliang11 · web-flow · commit e2090eaa9f60 · 2025-02-26T14:37:19.000+08:00
* [runtime] cosine score normalization

* [runtime] cosine score normalization
diff --git a/runtime/core/speaker/speaker_engine.cc b/runtime/core/speaker/speaker_engine.cc
@@ -168,6 +168,7 @@ float SpeakerEngine::CosineSimilarity(const std::vector<float>& emb1,
       std::inner_product(emb2.begin(), emb2.end(), emb2.begin(), 0.0);
   dot /= std::max(std::sqrt(emb1_sum) * std::sqrt(emb2_sum),
                   std::numeric_limits<float>::epsilon());
+  dot = (dot + 1.0) / 2.0;  // normalize: [-1, 1] => [0, 1]
   return dot;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -168,6 +168,7 @@ float SpeakerEngine::CosineSimilarity(const std::vector<float>& emb1,`
`168`	`168`	`std::inner_product(emb2.begin(), emb2.end(), emb2.begin(), 0.0);`
`169`	`169`	`dot /= std::max(std::sqrt(emb1_sum) * std::sqrt(emb2_sum),`
`170`	`170`	`std::numeric_limits<float>::epsilon());`
	`171`	`+ dot = (dot + 1.0) / 2.0; // normalize: [-1, 1] => [0, 1]`
`171`	`172`	`return dot;`
`172`	`173`	`}`
`173`	`174`