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Recently I try to train a face detector by train_cascade program. I use 10000 Positives, FP=0.5, TP=0.995 RAB and wekerdepth=1. I found the number of weak classifiers in the first cascade stage is around 100(I just give some very simple negatives image like blackboard) . But there are only 3 weak classifiers of the first stage in haarcascade_frontalface_alt.xml