ANN model used for YSO classification. Light blue dots represent input nodes for each required feature. Dark blue dots denote hidden neurons with sigmoid activation, while red dots represent output neurons with probabilistic Softmax activation. Black lines illustrate the connecting weights. Not all hidden neurons and weights are shown, for readability purposes. CII denotes a source classified as Class II and CIII a source classified as Class III. σ denotes the errors in different bands.