// specify layers for the neural network:
    // input layer of size 4 (features), two intermediate of size 5 and 4
    // and output of size 3 (classes)
// specify layers for the neural network:
    // input layer of size 4 (features), two intermediate of size 5 and 4
    // and output of size 3 (classes) | JavaMultilayerPerceptronClassifierExample.java