Schematic representation of the workflow presented in this paper. The diagram illustrates the key steps and processes involved in the analysis, from choosing the emission-line region models to the generation of the simulated dataset of spectra and the neural network’s classification. The leftmost image illustrates the model selection phase, depicting the distribution of our H II region, PN, SNR, and DIG models on a BPT diagnostic diagram (Baldwin et al. 1981). The central plot provides a representative simulated spectrum for each of the four classes. The rightmost panel presents a schematic of the neural network architecture, where the simulated spectra serve as input, and the network is trained to classify each spectrum into its corresponding nebular type.