train exponential smoothing method

src/model.py

@@ -65,7 +65,19 @@ def scale_train(train_ili):
     scaler = Scaler()
     train_ili_scaled = scaler.fit_transform(train_ili)
 
-    return train_ili_scaled
+    return train_ili_scaled, scaler
+
+
+def train_exponential_smoothing(train_ili_scaled, val_ili):
+    exp_sm = ExponentialSmoothing()
+    exp_sm.fit(train_ili_scaled)
+    exp_preds = exp_sm.predict(len(val_ili))
+
+    # print('Exponential Smoothing mape:', mape(val_ili, scaler.inverse_transform(exp_preds)))
+
+    return exp_preds
+
+