Tselil Schramm

tselil AT stanford DOT edu

I am an assistant professor of Statistics at Stanford University.

I am broadly interested in the theory of algorithms, optimization, and computational complexity, especially for problems arising in statistics. My work aims to develop algorithmic tools for high-dimensional estimation problems and to characterize and explain information-computation tradeoffs. Some specific themes in my research are: understanding the algorithmic power of the sum-of-squares hierarchy of semidefinite programs, developing fast spectral methods, and relating the power of different models of computation for high-dimensional estimation tasks.

Before joining Stanford, I received my PhD from U.C. Berkeley, where I was lucky to be advised by Prasad Raghavendra and Satish Rao. After that I was a postdoc at Harvard and MIT, hosted by the wonderful quadrumvirate of Boaz Barak, Jon Kelner, Ankur Moitra, and Pablo Parrilo. I also spent two lovely semesters as a research fellow at the Simons Institute, as part of the programs on Optimization and on Probability, Geometry, and Computation in High Dimensions.

Here is a tutorial for pronouncing my name.


Teaching:

Winter 2021: The Sum-of-Squares Algorithmic Paradigm in Statistics (STATS 319)


Papers:
Statistical query algorithms and low-degree tests are almost equivalent [arXiv]
with Matthew Brennan, Guy Bresler, Sam Hopkins and Jerry Li, in submission.

Computational barriers to estimation from low-degree polynomials [arXiv]
with Alex Wein, in submission.

Playing unique games on certified small-set expanders [arXiv]
with Mitali Bafna, Boaz Barak, Pravesh Kothari and David Steurer, in submission.

Subexponential LPs approximate max-cut [arXiv]
with Sam Hopkins and Luca Trevisan, in FOCS 2020.

(Nearly) efficient algorithms for the graph matching problem on correlated random graphs [arXiv]
with Boaz Barak, Chi-Ning Chou, Zhixian Lei, and Yueqi Sheng, in NeurIPS 2019.

Sherali-Adams strikes back [arXiv]
with Ryan O'Donnell, in CCC 2019.
Invited to the CCC 2019 special issue of Theory of Computing.

A robust spectral algorithm for overcomplete tensor decomposition [PMLR]
with Sam Hopkins, and Jonathan Shi, in COLT 2019.

SOS lower bounds with hard constraints: think global, act local [arXiv]
with Pravesh Kothari, and Ryan O'Donnell, in ITCS 2019.

The threshold for SDP-refutation of random regular NAE-3SAT [arXiv]
with Yash Deshpande, Andrea Montanari, Ryan O'Donnell, and Subhabrata Sen, in SODA 2019.

Computing exact minimum cuts without knowing the graph [arXiv]
with Aviad Rubinstein and Matt Weinberg, in ITCS 2018.

On the power of sum-of-squares for detecting hidden structures [arXiv]
with Sam Hopkins, Pravesh Kothari, Aaron Potechin, Prasad Raghavendra, and David Steurer, in FOCS 2017.

Fast and robust tensor decomposition with applications to dictionary learning [arXiv]
with David Steurer, in COLT 2017.

Strongly refuting random CSPs below the spectral threshold [arXiv]
with Prasad Raghavendra and Satish Rao, in STOC 2017.

Fast spectral algorithms from sum-of-squares proofs: tensor decomposition and planted sparse vectors [arXiv]
with Sam Hopkins, Jonathan Shi, and David Steurer, in STOC 2016.

On the integrality gap of degree-4 sum-of-squares for planted clique
with Sam Hopkins, Pravesh Kothari, Aaron Potechin, and Prasad Raghavendra, in SODA 2016 (merge of [this] paper and [this] paper)
Invited to the SODA 2016 special issue of ACM Transactions on Algorithms.

Braess's paradox for the spectral gap in random graphs and delocalization of eigenvectors [arXiv]
with Ronen Eldan and Miklos Racz, in Random Structures & Algorithms (2016).

Near optimal LP rounding algorithms for correlation clustering in complete and complete k-partite graphs [arXiv]
with Shuchi Chawla, Konstantin Makarychev, and Grigory Yaroslavtsev, in STOC 2015.

Gap amplification for small-set expansion via random walks [arXiv]
with Prasad Raghavendra, in APPROX 2014.

Global and local information in clustering labeled block models [arXiv]
with Varun Kanade and Elchanan Mossel , in RANDOM 2014, and in IEEE Transactions on Information Theory (2016).