Add score function to speaker identification (#775)

sherpa-onnx/csrc/speaker-embedding-manager.cc

@@ -151,6 +151,23 @@ class SpeakerEmbeddingManager::Impl {
     return true;
   }
 
+  float Score(const std::string &name, const float *p) {
+    if (!name2row_.count(name)) {
+      // Setting a default value if the name is not found
+      return -2.0;
+    }
+
+    int32_t row_idx = name2row_.at(name);
+
+    Eigen::VectorXf v =
+        Eigen::Map<Eigen::VectorXf>(const_cast<float *>(p), dim_);
+    v.normalize();
+
+    float score = embedding_matrix_.row(row_idx) * v;
+
+    return score;
+  }
+
   bool Contains(const std::string &name) const {
     return name2row_.count(name) > 0;
   }
@@ -206,6 +223,11 @@ bool SpeakerEmbeddingManager::Verify(const std::string &name, const float *p,
   return impl_->Verify(name, p, threshold);
 }
 
+float SpeakerEmbeddingManager::Score(const std::string &name,
+                                    const float *p) const {
+  return impl_->Score(name, p);
+}
+
 int32_t SpeakerEmbeddingManager::NumSpeakers() const {
   return impl_->NumSpeakers();
 }

sherpa-onnx/csrc/speaker-embedding-manager.h

@@ -74,6 +74,8 @@ class SpeakerEmbeddingManager {
    */
   bool Verify(const std::string &name, const float *p, float threshold) const;
 
+  float Score(const std::string &name, const float *p) const;
+
   // Return true if the given speaker already exists; return false otherwise.
   bool Contains(const std::string &name) const;