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Why is opencv SVM learning much faster than libsvm 3.18?

I am comparing OpenCV SVM and libsvm 3.18 and with the same parameters and dataset, OpenCV svm training time is about 6-8x faster than libsvm 3.18. I even set maximum iterations in the libsvm code. He said that OpenCV SVM is based on libsvm, but I'm wondering what the difference is between them. Thanks to

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opencv machine-learning svm libsvm


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