Positive (lens) and negative (non-lens) examples in our baseline ground-truth data set. The first, second, and third rows show mock lenses with 0.75″ <θ_E < 1.30″, 1.30″ < θ_E < 1.90″, and 1.90″ < θ_E < 2.50″, respectively. The fourth, fifth, and sixth rows show examples of LRGs, spirals, and random galaxies from the parent sample of galaxies with i-band Kron radius ≥ 0.8″, respectively. This corresponds to the three main classes of negative examples. Cutouts have sizes of 10″ × 10″.