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Cascade Classifier Training: Is the negNum decreasing each stage?

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Hello guy, Does the second stage train with the exact same training samples as the first stage or just with 0.5x of the negative samples (maxFalseAlarmRate = 0.5). The 0.5 neg sampels which were classified false? If yes: Why does the second stage needs more features to separate the data? If no: Is the amount of negative samples decreasing each stage by 0.5? After 20 stages there would be nearly no samples? I hope the question is understandable, Thanks a lot for your help!!! Kind regards, Derrick

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