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Efficient Unbiased Sparsification
Feb. 26, 2024, 5:42 a.m. | Leighton Barnes, Timothy Chow, Emma Cohen, Keith Frankston, Benjamin Howard, Fred Kochman, Daniel Scheinerman, Jeffrey VanderKam
cs.LG updates on arXiv.org arxiv.org
Abstract: An unbiased $m$-sparsification of a vector $p\in \mathbb{R}^n$ is a random vector $Q\in \mathbb{R}^n$ with mean $p$ that has at most $m<n$ nonzero coordinates. Unbiased sparsification compresses the original vector without introducing bias; it arises in various contexts, such as in federated learning and sampling sparse probability distributions. Ideally, unbiased sparsification should also minimize the expected value of a divergence function $\mathsf{Div}(Q,p)$ that measures how far away $Q$ is from the original $p$. If $Q$ …
abstract arxiv bias cs.it cs.lg federated learning math.it math.st mean probability random sampling stat.th type unbiased vector
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