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Try to explicitly point namespace of the opencv_face module

cv::Ptr<cv::face::facerecognizer> model = cv::face::createEigenFaceRecognizer();

Try to explicitly point namespace of the opencv_face module

cv::Ptr<cv::face::facerecognizer> model = cv::face::createEigenFaceRecognizer(); cv::face::createEigenFaceRecognizer();

Try to explicitly point namespace of the opencv_face module

cv::Ptr<cv::face::facerecognizer> cv::Ptr<cv::face::FaceRecognizer> model = cv::face::createEigenFaceRecognizer();