Table 1. Comparison of the Experimental Results of Different Models.

model	running time/s	MSE of the training set	MSE of the test set
RNN	4	0.000564	0.000563
LSTM	5	0.000517	0.000479
GRU	4	0.000477	0.000432
BiGRU	4	0.000457	0.000419