fix RMSE bug

utils/metrics.py

@@ -16,7 +16,7 @@ def calculate_metrics(y, y_hat, y_train=None):
 
     SMAPE = np.mean([smape(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)])
     MSE = np.mean([mean_squared_error(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)])
-    RMSE = np.mean([np.sqrt(mean_squared_error(yi.reshape(-1), y_hati.reshape(-1))) for yi, y_hati in zip(y, y_hat)])
+    RMSE = np.sqrt(np.mean([mean_squared_error(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)]))
     MAE = np.mean([mean_absolute_error(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)])
     R2 = np.mean([r2_score(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)])
     PSD = np.mean([phase_space_distance(yi.reshape(-1), y_hati.reshape(-1)) for yi, y_hati in zip(y, y_hat)])