作者: Yi Li , David P. Woodruff
DOI: 10.1007/978-3-642-40328-6_43
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摘要: We show an Ω((n 1 − 2/p logM)/e 2) bits of space lower bound for (1 + e)-approximating the p-th frequency moment \(F_p = \|x\|_p^p \sum_{i=1}^n |x_i|^p\) a vector x ∈ { M, M 1, …, M} n with constant probability in turnstile model data streams, any p > 2 and e ≥ 1/n 1/p (we require since there is trivial O(n logM) upper bound). This matches complexity Ganguly . again optimal < 1/log O(1) n.