Performance of the classifier when applied to the error convolved GUMS data with Gaia DR2 uncertainties, in the case when only the 5D phase-space coordinates and the optical photometry of the stars are used as training features. Top panel: sky distributions of the correctly detected halo stars (blue), false negatives (orange), and false positives (red). Bottom left panel: velocity distribution in the Galactic cylindrical pseudo velocity plane vs. (v_los = 0 km s⁻¹). Bottom middle panel: HR diagram of the stars shown on the top panel. Symbols are as on the top panel. Bottom right panel: distance distribution of the stars in the sample. The histogram colours match the colours of the points in the other panels.