ARC Colloquium: Anup Rao - Georgia Tech

Event Details

Dani Denton
denton at cc dot gatech dot edu



Summary Sentence: Klaus 1116 West at 1 pm

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Algorithms & Randomness Center (ARC)

Anup Rao – Georgia Tech

Monday, October 26, 2015

Klaus 1116 West – 1:00 pm

(Refreshments will be served in Klaus 2222 at 2 pm)



The Stochastic Block Model and Communities in Sparse Random Graphs: Detection at Optimal Rate


We consider the problem of communities detection in sparse random graphs. Our model is the so-called Stochastic Block Model, which has been immensely popular in the recent statistics literature. Let X1,...Xk be vertex sets of size n each (where k is fixed and n is large). One draws random edges inside each Xi with probability a/n, and between Xi and Xj with probability b/n, for some constants a and b. Given one instance of this sparse random graph, our goal is to recover the sets Xi as correctly as possible. We are going to present a fast spectral algorithm which does this job at the optimal rate (namely the relation between a,b and the number of mistakes in the recovery is optimal). Our algorithm is based on spectral properties of random sparse matrices and is easy to implement. We will also discuss some related works with spectral algorithms and an open question concerning random matrices.

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Additional Information

In Campus Calendar

College of Computing, School of Computer Science, ARC

Invited Audience
Undergraduate students, Faculty/Staff, Public, Graduate students
Algorithm and Randomness Center, ARC, Computational Complexity, Computational Learning Theory, Georgia Tech
  • Created By: Dani Denton
  • Workflow Status: Published
  • Created On: Sep 10, 2015 - 5:44am
  • Last Updated: Apr 13, 2017 - 5:18pm