How to use gpu hog with svmLight

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I'm trying to train svmLight model with gpu hog using the function getDescriptors(....) . But I am having error in the value of feature obtained from this process . Some values in the featureVector.dat file are nan while others have high powers of 10 . What should I do to resolve the error. I have used 48x80 window size , 16x16 block size , 8x8 cell size and 9 bins per cell. Someone please help me.