Tag
linear-sketches
- May 14, 2025 Linear Sketches and Recovering Sparse Signals from Bucket Measurements How a sketch that only stores bucket sums can still return the identities of heavy items, why recovery needs a median over rows, and what the restricted isometry property guarantees. algorithms
- Sep 23, 2023 Frequency Moments and the Tug-of-War Sketch How a random sign vector turns the second frequency moment into a sum of squares, why the estimator is unbiased, and how the same construction generalises to higher moments. algorithms