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  • SZ 0.5.10 optimizes the offset by using the optimized formula of computing the median_value based on optimized right-shifting method. Anyway, 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)
  • SZ 0.5.11 (a.k.a., SZh) improved SZ 0.5.10 on the level of guaranteeing user-specified error bounds. In a very few cases, SZ 0.5.10 cannot guarantee the error-bounds to a certain user-specified level. For example, when absolute error bound = 1E-6, the maximum decompression error may be 0.01(>>1E-6) because of the huge value range even in the optimized segments such that the normalized data cannot reach the required precision even stoaring all of the 64 or 32 mantissa bits. SZ 0.5.11 fixed the problem well, with degraded compression ratio less degraded by less than 1% in that case. 

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