fix(example): speech error (#1679)

fix

example/speech_command/sc/evaluator.py

@@ -97,7 +97,7 @@ def _post(self, input: torch.Tensor) -> t.Tuple[t.List[int], t.List[float]]:
         input = input.squeeze()
         pred_value = input.argmax(-1).item()
         probability_matrix = np.exp(input.tolist()).tolist()
-        return pred_value, probability_matrix[0]
+        return pred_value, probability_matrix
 
     def _load_model(self, device):
         model = M5(n_input=1, n_output=len(ALL_LABELS))