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the cascade training tools were removed from the 4.x branches (c-api dependancy)
you would need to rebuild the opencv 3.4 branch from src, pip is not at all helpful here (it does not care about c++ sources)
alternatively, you could try the 3.4.11 binary release, which still contains those progs.
but please be aware, that most ppl trying to train cascades are simply "wrong about it", and that it's not feasible to do so (e.g. variation in pose / texture / no texture at all)
maybe you should ask again here, and present, what kind of objects you try to detect, and what kind of images you have to train it, and we can help you with a better, more appropriate idea.
