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- research-articleJuly 2024
Solving Sparse Linear Systems Faster than Matrix Multiplication
Communications of the ACM (CACM), Volume 67, Issue 7Pages 79–86https://doi.org/10.1145/3615679Can linear systems be solved faster than matrix multiplication? While there has been remarkable progress for the special cases of graph-structured linear systems, in the general setting, the bit complexity of solving an n × n linear system Ax = b is Õ(nω)...
- research-articleJanuary 2024
Taming Algorithmic Priority Inversion in Mission-Critical Perception Pipelines
- Shengzhong Liu,
- Shuochao Yao,
- Xinzhe Fu,
- Rohan Tabish,
- Simon Yu,
- Ayoosh Bansal,
- Heechul Yun,
- Lui Sha,
- Tarek Abdelzaher
Communications of the ACM (CACM), Volume 67, Issue 2Pages 110–117https://doi.org/10.1145/3610801The paper discusses algorithmic priority inversion in mission-critical machine inference pipelines used in modern neural-network-based perception subsystems and describes a solution to mitigate its effect. In general, priority inversion occurs in ...
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- research-articleNovember 2023
Almost-Linear-Time Algorithms for Maximum Flow and Minimum-Cost Flow
Communications of the ACM (CACM), Volume 66, Issue 12Pages 85–92https://doi.org/10.1145/3610940We present an algorithm that computes exact maximum flows and minimum-cost flows on directed graphs with m edges and polynomially bounded integral demands, costs, and capacities in m1+o(1) time. Our algorithm builds the flow through a sequence of m1+o(1) ...
- newsOctober 2023
Quantum Speedup for the Fast Fourier Transform?
Communications of the ACM (CACM), Volume 66, Issue 11Pages 8–10https://doi.org/10.1145/3623641It is difficult to improve on the widely used, already-efficient algorithm.
- research-articleJanuary 2022
How topic novelty impacts the effectiveness of news veracity interventions
Communications of the ACM (CACM), Volume 65, Issue 2Pages 68–75https://doi.org/10.1145/3460350Can algorithmic advice override preconceived notions and the believability of fake news?
- research-articleJuly 2019
Heavy hitters via cluster-preserving clustering
Communications of the ACM (CACM), Volume 62, Issue 8Pages 95–100https://doi.org/10.1145/3339185We develop a new algorithm for the turnstile heavy hitters problem in general turnstile streams, the EXPANDERSKETCH, which finds the approximate top-k items in a universe of size n using the same asymptotic O(k log n) words of memory and O(log n) update ...
- research-articleSeptember 2015
Computing numerically with functions instead of numbers
Communications of the ACM (CACM), Volume 58, Issue 10Pages 91–97https://doi.org/10.1145/2814847Science and engineering depend upon computation of functions such as flow fields, charge distributions, and quantum states. Ultimately, such computations require some kind of discretization, but in recent years, it has become possible in many cases to ...
- departmentJanuary 2011
Nonlinear systems made easy
Communications of the ACM (CACM), Volume 54, Issue 1Pages 17–19https://doi.org/10.1145/1866739.1866745Pablo Parrilo has discovered a new approach to convex optimization that creates order out of chaos in complex nonlinear systems.
- articleNovember 1995
Rough sets
Communications of the ACM (CACM), Volume 38, Issue 11Pages 88–95https://doi.org/10.1145/219717.219791Rough set theory, introduced by Zdzislaw Pawlak in the early 1980s [11, 12], is a new mathematical tool to deal with vagueness and uncertainty. This approach seems to be of fundamental importance to artificial intelligence (AI) and cognitive sciences, ...