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1. Use built-in mad() instead of += and *. 2. For stump stages, if weight.z == 0, avoid unnecessary calculation because some features only have 2 rectangles.. It could improve OCL_Cascade_Image_MinSize_CascadeClassifier.CascadeClassifier/* about 10% mean values. Signed-off-by: Yan Wang <yan.wang@linux.intel.com>
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