implemented Keyword_Spotting_service function

backend/IT18218640/keyword_spotting_service.py

@@ -45,4 +45,13 @@ class _Keyword_Spotting_Service:
         # extract MFCCs
         MFCCs = librosa.feature.mfcc(signal, n_mfcc=n_mfcc, n_fft=n_fft, hop_length=hop_length)
 
-        return MFCCs.T
+        return MFCCs.T
\ No newline at end of file
+
+def Keyword_Spotting_service():
+
+    # ensure that we only have 1 instance of KSS
+    if _Keyword_Spotting_Service._instance is None:
+        _Keyword_Spotting_Service._instance = _Keyword_Spotting_Service()
+        _Keyword_Spotting_Service.model = keras.models.load_model(MODEL_PATH)
+
+    return _Keyword_Spotting_Service._instance