Data description. (a) Signal-to-noise ratio distribution across the u, g, r, i, z bands from LAMOST. White dwarfs’ characteristics are primarily concentrated in the u band, with a median S/N of 3.14 and a mode of 1.17, indicating extremely poor data quality. (b) Distribution of log g labels, primarily concentrated around 8 dex. (c) Distribution of T_eff labels, primarily concentrated around 20 000 K. (d) Two-dimensional histogram of the distribution in the parameter space.