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I can suggest to use an earlier versions of OpenCV to train the cascades, I'm still using the traincascade in Opencv 2.4.10 and it is still perfectly working and suitable for OpenCV 3 and 4 detectors.

Take a look here: http://www.vision-ary.net/2015/03/largest-boosted-cascades-opencv-lbp-haar-hog/

Regards!