t-SNE projections. Top: classification. Bottom: redshifts. Left: raw output from the ML models for all the inference subsets. Center: spectroscopic SDSS distributions. Right: final QSO catalog at progressing magnitudes with the corresponding probability cuts, excluding the unsafe inference. The visualizations were made on a subset of 12k objects, thus actual object density at any part of the feature space is 3.8k times higher.