Search Results for author: Christopher Harshaw

Found 6 papers, 3 papers with code

The Power of Subsampling in Submodular Maximization

no code implementations6 Apr 2021 Christopher Harshaw, Ehsan Kazemi, Moran Feldman, Amin Karbasi

We propose subsampling as a unified algorithmic technique for submodular maximization in centralized and online settings.

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How Do You Want Your Greedy: Simultaneous or Repeated?

1 code implementation29 Sep 2020 Moran Feldman, Christopher Harshaw, Amin Karbasi

We also present SubmodularGreedy. jl, a Julia package which implements these algorithms and may be downloaded at https://github. com/crharshaw/SubmodularGreedy. jl .

Balancing Covariates in Randomized Experiments with the Gram-Schmidt Walk Design

1 code implementation8 Nov 2019 Christopher Harshaw, Fredrik Sävje, Daniel Spielman, Peng Zhang

Asymptotically, the design perfectly balances all linear functions of a growing number of covariates with a diminishing reduction in robustness, effectively allowing experimenters to escape the compromise between balance and robustness in large samples.

Methodology Data Structures and Algorithms Statistics Theory Statistics Theory

Submodular Maximization Beyond Non-negativity: Guarantees, Fast Algorithms, and Applications

1 code implementation19 Apr 2019 Christopher Harshaw, Moran Feldman, Justin Ward, Amin Karbasi

It is generally believed that submodular functions -- and the more general class of $\gamma$-weakly submodular functions -- may only be optimized under the non-negativity assumption $f(S) \geq 0$.

Experimental Design

Projection-Free Online Optimization with Stochastic Gradient: From Convexity to Submodularity

no code implementations ICML 2018 Lin Chen, Christopher Harshaw, Hamed Hassani, Amin Karbasi

We also propose One-Shot Frank-Wolfe, a simpler algorithm which requires only a single stochastic gradient estimate in each round and achieves an $O(T^{2/3})$ stochastic regret bound for convex and continuous submodular optimization.

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