OpenCV Error: Assertion failed (data0.dims <= 2 && type == 5 && K > 0) in cv::kmeans 

报错：

数据类型不对，转换一下就可以了。 all_descriptors .convertTo(all_descriptors, CV_32F);

加入在 Mat vocabulary = bowTrainer.cluster(allDescriptors); 之前就可以了

allDescriptors.convertTo(allDescriptors, CV_32F);

BOWKMeansTrainer bowTrainer(wordCount, tc, retries, flags);

Mat vocabulary = bowTrainer.cluster(allDescriptors);