
6 Advanced Process Control and Simulation for Chemical Engineers
The suitable number of neurons in the hidden layer was determined by changing
the number of neurons. As shown in Table 3, the best prediction, based on minimum
error, was obtained by ANN with 8 neurons in hidden layer. The R
2
and RMSE were
0.97 and 0.61 respectively. The comparison between the actual and predicted value
given by ANN is shown in the Figure 3 and demonstrated that all points are located
close to a straight line.
TABLE 3 The results of prediction by artificial neural network.
No. of model Mean SD Max. Min. R
2
RMSE
1 0.03 0.04 0.13 0.01 0.85 1.21
2 0.05 0.04 0.16 0.00 ...