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  • SZ 0.5.9 optimize the offset by using simple right-shifting method. Experiments show that this cannot improve compression ratio actually, because simple right-shifting actually make each data be multiplied by 2^{-k}, where k is # right-shifting bits. The pros is to save bits because of more leading-zero bytes, but the cons is much more required bits to save. A good solution is SZ 0.5.10 (or SZh)!
  • SZ 0.5.10 (a.k.a., SZh) optimize optimizes the offset by using the optimized formula of computing the median_value based on optimized right-shifting method. Anyway, SZ0.5.10 SZh improves compression ratio a lot for hard-to-compress datasets. (Hard-to-compress datasets refer to the cases whose compression ratios are usually very limited)

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