General architecture of our fully connected NN model (some connections have been omitted for clarity). The input parameters are the five values of the grid, effective temperatures Teff, surface gravity log ɡ, and metalicities [M/H], [C/M], and [α/М]. The n_o output values are the result of the dimensionality reduction used: for PCA the 12 components of each parameter for a specific model atmosphere (48 in total) and when using the encoder of our CAE 48, 64, and up to 71 which constitutes the best configuration. The values of n_n neurons per layer and n_l layers are described in Table 1.