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- W4254355229 abstract "We settle the 1-pass space complexity of (1 ± ε)-approximating the Lp norm, for real p with 1 ≤ p ≤ 2, of a length-n vector updated in a length-m stream with updates to its coordinates. We assume the updates are integers in the range [–M, M]. In particular, we show the space required is Θ(ε−2 log(mM) + log log(n)) bits. Our result also holds for 0 < p < 1; although Lp is not a norm in this case, it remains a well-defined function. Our upper bound improves upon previous algorithms of [Indyk, JACM ‘06] and [Li, SODA ‘08]. This improvement comes from showing an improved derandomization of the Lp sketch of Indyk by using k-wise independence for small k, as opposed to using the heavy hammer of a generic pseudorandom generator against space-bounded computation such as Nisan's PRG. Our lower bound improves upon previous work of [Alon-Matias-Szegedy, JCSS ‘99] and [Woodruff, SODA ‘04], and is based on showing a direct sum property for the 1-way communication of the gap-Hamming problem." @default.
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- W4254355229 date "2010-01-17" @default.
- W4254355229 modified "2023-09-25" @default.
- W4254355229 title "On the Exact Space Complexity of Sketching and Streaming Small Norms" @default.
- W4254355229 doi "https://doi.org/10.1137/1.9781611973075.93" @default.
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