The figure is updated from Tetko
et al, 1996. It shows that there is some number of iterations
after which the prediction of neural network for new, unseen data (in this
case this is the validation set) start to increase, despite RMSE error
for the learning set continuously decreases. This phenomenon is known as
overtraining/overfitting of neural networks that is analyzed in Tetko et
al., 1995. Thus, it is preferably to terminate neural network learning
before convergence it to local minimum for the learning set (point S3).
This can be done by termination of neural network training in point corresponding
to minimum of neural network for the validation set (early stopping
point S1), or neural network minimum for the join set (the initial
training set, early stopping point S2).
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