private RoaringBitmap unserializeBitmap(byte[] bitmapBytes) {
            ByteBuffer bb = ByteBuffer.wrap(bitmapBytes);
            return new ImmutableRoaringBitmap(bb).toRoaringBitmap();
        }
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