Nickel Price Forecast Based on the LSTM Neural Network Optimized by the Improved PSO Algorithm

Table 3

The display of partial LSTM prediction models.

Model	Structure	RMSE verification
LSTM1	(look_back, node, layer) = (10, 3, 1)	788.60
LSTM2	(look_back, node, layer) = (15, 3, 1)	617.53
LSTM3	(look_back, node, layer) = (15, 11, 1)	973.40
LSTM4	(look_back, node1, node2, layer) = (15, 4, 11, 2)	624.12