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Fix negative values in HOG calculation #606
In general, I have not investigated the correctness of this branch - however - there are so many implementations of HOG anyway that I don't think this really hurts. From what I've seen this doesn't affect fitting performance at all and it stops a potential segfault. Thoughts on just merging this and then coming back to re-implementing HOG/LBP in the future @jabooth @nontas?