Prediction score as a function of merger time (top panel: the two-stage classification set-up, and bottom panel: the one-stage set-up). The x-axis is stretched in the merger regime. In the two-stage set-up, the first stage gives each galaxy a merger (green) and non-merger (yellow) prediction score. For the predicted mergers, the second stage gives a pre-merger (purple) and post-merger (blue) prediction score. The error bars correspond to the bootstrap errors. For the one-stage (two-stage) set-up, a grey dotted line at 0.33 (0.5) is added to indicate the prediction score of a random classifier.