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Two synthetic detections for the metrics F1-Frame, Event Agreement (EA) [22] and F1-Event. (a) shows ground truth (gray thick line) and two detections (thin lines). In F1-Frame, det1 scores higher although it has multiple false positives and misses a whole event. EA favors det2 as it is more desirable in detecting AU events. In (b), F1-Event curve reflects boundary misalignment in det2, which is ignored in Event Agreement.
