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Events by month

November 2018

Friday, November 2, 2018 — 1:00 PM EDT

Title: Approximating k-Median via Pseudo-Approximation

Speaker: Sharat Ibrahimpur Affiliation: University of Waterloo Room: MC 5479

Abstract: In the last two talks we saw two approaches for approximating k-median.

Friday, November 2, 2018 — 3:30 PM EDT

Title: Razborov's flag algebras: Ten years on

Speaker: Sergey Norin Affiliation: McGill University Room: MC 5501

Abstract:

Many of the classical results in extremal combinatorics were obtained by ingenious application of elementary techniques, such as induction and Cauchy-Schwarz inequality.

Wednesday, November 7, 2018 — 4:00 PM EST

Title: Hamiltonian Descent Methods

Speaker: Guojun Zhang Affiliation: University of Waterloo Room: MC 5479

Abstract: In this talk, I will present a paper on the Hamiltonian descent methods

Thursday, November 8, 2018 — 3:30 PM EST

Title:  2-universality of random graphs.

Speaker: Gal Kronenberg Affiliation: Tel Aviv University Room:  *MC 6486* 

Abstract: For a family of graphs F, a graph G is F-universal if G contains every graph in F as a (not necessarily induced) subgraph.

Friday, November 9, 2018 — 1:00 PM EST

Title: Approximate Clustering without the Approximation

Speaker: Thomas Baxter Affiliation: University of Waterloo Room: MC 5417

Abstract: Previously in this CombOpt Reading Group series, we have discussed improving approximation factors for particular distance-based objective functions in clustering problems.

Friday, November 9, 2018 — 3:30 PM EST

Title: Approximation Algorithms for Distributionally Robust Stochastic Optimization

Speaker: Chaitanya Swamy Affiliation: University of Waterloo Room: MC 5501

Abstract:

Two-stage stochastic optimization is a widely-used framework for modeling uncertainty, where we have a probability distribution over possible realizations of the data, called scenarios, and decisions are taken in two stages: we make first-stage decisions knowing only the underlying distribution and before a scenario is realized, and may take additional second-stage recourse actions after a scenario is realized.

Wednesday, November 14, 2018 — 4:00 PM EST

Title: Why Random Reshuffling Beats Stochastic Gradient Descent

Speaker: Julian Romero Affiliation: University of Waterloo Room: MC 5479

Abstract:  Over the first few lectures in the seminar we studied the Stochastic Gradient Descent (SGD) method

Thursday, November 15, 2018 — 3:30 PM EST

Title:  A Short Proof of the Containers Theorem for Hypergraphs

Speaker: Michelle Delcourt Affiliation: University of Waterloo Room: MC 6486

Abstract:  A modern trend in extremal combinatorics is extending classical results from the dense setting (e.g. Szemerédi's theorem)

Friday, November 16, 2018 — 1:00 PM EST

Title: Stability Yields a PTAS for k-Median and k-Means Clustering

Speaker: Adam Brown Affiliation: University of Waterloo Room: MC 5479

Abstract: Previously, we have seen a variety of approximation methods for k-median, and last week we saw

Friday, November 16, 2018 — 3:30 PM EST

Title: Solving DNN Relaxations of the Quadratic Assignment Problem with ADMM and Facial Reduction

Speaker: Henry Wolkowicz Affiliation: University of Waterloo Room: MC 5501

Abstract:

The quadratic assignment problem, QAP, has many important applications ranging from the planning of building locations of a university, to the positioning of modules on a computer chip (VLSI design), to the design of keyboards.

Wednesday, November 21, 2018 — 4:00 PM EST

Title: Tutorial on Convolutional Neural Networks

Speaker: Haesol Im Affiliation: University of Waterloo Room: MC 5479

Abstract: We have seen stochastic gradient descent and automatic differentiation to help handle the big dimensionality of problems that often occur in machine learning.

Thursday, November 22, 2018 — 3:30 PM EST

Title: The upper density of monochromatic infinite paths

Speaker: Richard Lang Affiliation: University of Waterloo Room: MC 5417

Abstract: Given a complete graph $K_n$, whose edges are coloured in red and blue, what is the longest monochromatic path one can find?

Friday, November 23, 2018 — 3:30 PM EST

Title: Implementing supersingular isogeny cryptography

Speaker: David Jao Affiliation: University of Waterloo Room: MC 5501

Abstract:

Recent years have seen dramatic progress and improvements in the implementation of supersingular isogeny-based cryptosystems.

Tuesday, November 27, 2018 — 5:30 PM EST
Marc Morin

The "blood, sweat, tears, toil and triumphs" of commercializing technology

Wednesday, November 28, 2018 — 4:00 PM EST

Title: Convergence Rate of Block-Coordinate Maximization Burer-Monteiro Method for Solving Large SDP

Speaker: Sina Rezazadeh Affiliation: University of Waterloo Room: MC 5479

Abstract: Burer and Monteiro in 2003 proposed a nonlinear algorithm for solving semidefinite programs.

Thursday, November 29, 2018 — 3:30 PM EST

Title: Flag algebras and subgraph density problems

Speaker: Kris Siy Affiliation: University of Waterloo Room: MC 5417

Abstract: Flag algebras are a tool introduced by Razborov in 2007 that has since been successfully used to approach or solve many problems in asymptotic extremal combinatorics.

Friday, November 30, 2018 — 1:00 PM EST

Title: Clustering under Ordered Norms

Speaker: Sharat Ibrahimpur Affiliation: University of Waterloo Room: MC 5479

Abstract: In this talk we will see approximation algorithms for a broad class of objective functions called as ordered norms.

Friday, November 30, 2018 — 3:30 PM EST

Title: Aggregation-based cutting-planes for packing and covering integer programs

Speaker: Merve Bodur Affiliation: University of Toronto Room: MC 5501

Abstract:

We study the strength of Chvatal-Gomory (CG) cuts and more generally aggregation cuts for packing and covering integer programs (IPs).

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