create predict function

backend/IT18218640/keyword_spotting_service.py

@@ -17,3 +17,18 @@ class _Keyword_Spotting_Service:
         "yellow"
     ]
     _instance = None
+
+    def predict(self, file_path):
+
+        # extract MFCCs
+        MFCCs = self.preprocess(file_path) # (# segment, # coefficients)
+
+        # convert 2d MFCCs array into 4d array -> (# samples, # segment, # coefficients, # channels)
+        MFCCs = MFCCs[np.newaxis, ..., np.newaxis]
+
+        # make prediction
+        predictions = self.model.predict(MFCCs)
+        predicted_index = np.argmax(predictions)
+        predicted_keyword = self._mappings[predicted_index]
+
+        return predicted_keyword
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