private static int[] computeHash(int[] minhashes, int band, int nRows) {
        int[] hashes = new int[nRows];
        for (int r = 0; r < nRows; r++) {
            hashes[r] = minhashes[band * nRows + r];
        }
        return hashes;
    }
Finds the number of bands that need to be used for a given similarity threshold.

@param nHashes
@param jaccardThreshold
@return
ache/src/main/java/achecrawler/minhash/LSH.java