How to train SVM classifier using Different sizes of HOG feature vectors?

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Md. Muhaimin Rahman 2016-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/282639-how-to-train-svm-classifier-using-different-sizes-of-hog-feature-vectors

Peace. I was trying to develope an SVM classifier using HOG features of a particular Image. But the problem is the Different images has different sizes of HOG feature vectors . As a result , I cannot make a matrix containing all of the features which must be given as an input to the built in svm training function! What should I do ?