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Quantum-Inspired Algorithms from Randomized Numerical Linear Algebra
Nadiia Chepurko · Kenneth Clarkson · Lior Horesh · Honghao Lin · David Woodruff

Tue Jul 19 11:10 AM -- 11:15 AM (PDT) @ Room 310

We create classical (non-quantum) dynamic data structures supporting queries for recommender systems and least-squares regression that are comparable to their quantum analogues. De-quantizing such algorithms has received a flurry of attention in recent years; we obtain sharper bounds for these problems. More significantly, we achieve these improvements by arguing that the previous quantum-inspired algorithms for these problems are doing leverage or ridge-leverage score sampling in disguise; these are powerful and standard techniques in randomized numerical linear algebra. With this recognition, we are able to employ the large body of work in numerical linear algebra to obtain algorithms for these problems that are simpler or faster (or both) than existing approaches. Our experiments demonstrate that the proposed data structures also work well on real-world datasets.

Author Information

Nadiia Chepurko (MIT)
Kenneth Clarkson (IBM Research)
Lior Horesh (IBM Research)
Honghao Lin (Carnegie Mellon University)
David Woodruff (Carnegie Mellon University)

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