Fraction of the three predicted classes as a function of merger time before or after coalescence in the regimes of true mergers (blue shaded region: true post-mergers, and pink shaded region: true pre-mergers) and true non-mergers. The x-axis is stretched in the merger regime. The solid lines indicate the results of the one-stage classification set-up. The dashed lines indicate the results of the two-stage classification set-up. The error bars are derived from bootstrap error. For a perfect classifier, the fraction of predicted pre-mergers, post-mergers, or non-mergers would be 100% in the true pre-merger, post-merger, or non-merger region and 0% everywhere else.