输出后显示这一个错误
knn.train(train,cv2.ml.ROW_SAMPLE, trainLabels)
cv2.error: OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\ml\src\data.cpp:296: error: (-215:Assertion failed) (layout == ROW_SAMPLE && responses.rows == nsamples) || (layout == COL_SAMPLE && responses.cols == nsamples) in function 'cv::ml::TrainDataImpl::setData'