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I was reading this paper about Kernenlized locality-sensitive hashing (LSH) and in section 6.4 the chi-square-kernel function to measure the distance between two histograms hi and hj as:

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Anyway in this link is defined in section 20 as:

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And then as:

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Which one should I use for measuring the distance between two image histograms obtained from a Bag of Features?

Steffen Moritz
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user6321
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  • Possible duplicate of [Comparing two histograms using Chi-Square distance](https://stats.stackexchange.com/questions/184101/comparing-two-histograms-using-chi-square-distance) – kjetil b halvorsen Feb 13 '18 at 11:03

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