Table 7.

The comparison results of 5 models in Amazon.

Model	Training set			Test set
	RMSE	R2	RPD	RMSE	R2	RPD
CNN	14.4468	0.99484	14.9258	136.2487	0.97407	10.0916
LSTM	7.4371	0.99863	27.0368	1249.0474	−1.1789	1.166
BiLSTM	7.6044	0.99857	26.7637	983.8625	−0.35191	1.3677
GRU	7.4646	0.99862	27.3561	1310.8926	−1.4	1.1248
Transformer	8.8969	0.99804	23.3262	88.2008	0.98914	10.427