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as of 3.0, you can no more use the Algorithm::create(name) method, that's gone.
each detector/extractor class has it's own static create() method, like Ptr<ORB> orb = ORB::create();
SIFT and SURF were moved to the opencv_contrib repo , also have an additional namespace: `Ptr<xfeatures2d::SIFT> sift = xfeatures2d::SIFT::create();