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(a) Structure of the proposed NNC neural network. (b) Scheme of the software framework implemented to tune NNC hyper-parameters h: block A randomly initializes h values and splits the dataset to defines test and training set; block B assesses the performance of h in a 5-fold CV setting over the training set; block C implements TPE to optimize h; block D selects the best h set and finally; block E evaluates the performance of NNC on the test set.
