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cs.DS2025
Faster Low-Rank Approximation and Kernel Ridge Regression via the Block-Nyström Method
Sachin Garg, Michał Dereziński
The Nyström method is a popular low-rank approximation technique for large matrices that arise in kernel methods and convex optimization. Yet, when the data exhibits heavy-tailed s…
cs.DS2024
Distributed Least Squares in Small Space via Sketching and Bias Reduction
Sachin Garg, Kevin Tan, Michał Dereziński
Matrix sketching is a powerful tool for reducing the size of large data matrices. Yet there are fundamental limitations to this size reduction when we want to recover an accurate e…