By
**David P. Woodruff**, IBM Research Almaden, USA, dpwoodru@us.ibm.com

David P. Woodruff (2014), "Sketching as a Tool for Numerical Linear Algebra", Foundations and Trends® in Theoretical Computer Science: Vol. 10: No. 1–2, pp 1-157. http://dx.doi.org/10.1561/0400000060

© 2014 D. P. Woodruff

Computational Number Theory, Design and analysis of algorithms, Dimensionality reduction, Spectral methods, Data mining

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**In this article:**

This survey highlights the recent advances in algorithms for numerical linear algebra that have come from the technique of linear sketching, whereby given a matrix, one first compresses it to a much smaller matrix by multiplying it by a (usually) random matrix with certain properties. Much of the expensive computation can then be performed on the smaller matrix, thereby accelerating the solution for the original problem. In this survey we consider least squares as well as robust regression problems, low rank approximation, and graph sparsification. We also discuss a number of variants of these problems. Finally, we discuss the limitations of sketching methods.

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1. Introduction

2. Subspace Embeddings and Least Squares Regression

3. Least Absolute Deviation Regression

4. Low Rank Approximation

5. Graph Sparsification

6. Sketching Lower Bounds for Linear Algebra

7. Open Problems

Acknowledgments

References

*Sketching as a Tool for Numerical Linear Algebra* highlights the recent advances in algorithms for numerical linear algebra that have come
from the technique of linear sketching, whereby given a matrix, one first compressed it to a much smaller matrix by multiplying it by a
(usually) random matrix with certain properties. Much of the expensive computation can then be performed on the smaller matrix, thereby
accelerating the solution for the original problem.

*Sketching as a Tool for Numerical Linear Algebra* considers least squares as well as robust regression problems, low rank
approximation, and graph sparsification. It also discusses a number of variants of these problems. It concludes by discussing the limitations
of sketching methods and briefly looking at some open questions.

*Sketching as a Tool for Numerical Linear Algebra* is an ideal primer for researchers and students of theoretical computer science interested in how sketching techniques can be used to speed up numerical linear algebra applications.