cv2.error: OpenCV(3.4.2) /opt/concourse/worker/volumes/live/9523d527-1b9e-48e0-7ed0-a36adde286f0/volume/opencv-suite_1535558719691/work/opencv_contrib-3.4.2/modules/face/src/eigen_faces.cpp:72: error: (-210:Unsupported format or combination of formats) In the Eigenfaces method all input samples (training images) must be of equal size! Expected 8100 pixels, but was 6561 pixels. in function 'train'

[woshituobaye]

hello！
when I use
ace_recognizer = cv2.face.FisherFaceRecognizer_create()
or
face_recognizer = cv2.face.EigenFaceRecognizer_create()
There is an error：cv2.error: OpenCV(3.4.2) /opt/concourse/worker/volumes/live/9523d527-1b9e-48e0-7ed0-a36adde286f0/volume/opencv-suite_1535558719691/work/opencv_contrib-3.4.2/modules/face/src/fisher_faces.cpp:81: error: (-210:Unsupported format or combination of formats) In the Fisherfaces method all input samples (training images) must be of equal size! Expected 8836 pixels, but was 6724 pixels. in function 'train'

why ?
thank you !