Decomposition-Based Multistep Sea Wind Speed Forecasting Using Stacked Gated Recurrent Unit Improved by Residual Connections

Table 3

Result of different combination of decomposition and prediction methods.

	Step	LSTM			GRU			Stacked LSTM			Stacked GRU
		RMSE	MAE	MAPE	RMSE	MAE	MAPE	RMSE	MAE	MAPE	RMSE	MAE	MAPE
WT	1	0.2745	0.2108	4.2170	0.2574	0.1927	3.8381	0.2982	0.2272	4.5937	0.2882	0.2182	4.3407
	2	0.4507	0.3495	7.0160	0.4574	0.3533	6.9554	0.4782	0.3698	7.4155	0.4746	0.3696	7.2957
	3	0.5372	0.4191	8.3136	0.5463	0.4257	8.3779	0.5645	0.4378	8.8016	0.5681	0.4412	8.7430
EMD	1	0.2304	0.1892	3.2575	0.2709	0.2103	3.8818	0.4361	0.3522	6.0360	0.2691	0.2131	3.6862
	2	0.2724	0.2183	3.7819	0.4051	0.3124	5.7697	0.5206	0.4182	7.2722	0.4167	0.3290	5.8089
	3	0.3316	0.2632	4.5792	0.5425	0.4185	7.7118	0.5835	0.4681	8.3242	0.4485	0.3486	6.3692
VMD	1	0.1598	0.1251	2.4619	0.1385	0.1058	2.0586	0.1682	0.1298	2.4828	0.1436	0.1080	2.0625
	2	0.1896	0.1495	2.9270	0.1643	0.1290	2.5175	0.2087	0.1645	3.1505	0.1733	0.1361	2.6172
	3	0.2048	0.1615	3.1113	0.1779	0.1393	2.7237	0.2257	0.1784	3.3679	0.1889	0.1485	2.7730