Figure 5 Performance of ANN model with a variable number of
neurons in the second hidden layer. (a) R; (b) MSE
The final architectural diagram of the selected ANN model is shown in
Figure 6 with 8 inputs, five neurons for the first hidden layer and 7
for the second. The improvement in performance of the ANN model
during the training, validating and testing processes is illustrated in
Figure 7. At the epoch 19th, the best
validation performance was reached while the training performance still
improved after epoch 19th.