utexas.edu College of Natural Sciences School of Computing

Fall 2026 SDS Seminar Series

SDS Seminar Series – Arhit Chakrabarti, University of Texas at Austin

background image

Sep

18

2026

2:00 pm

Cost: Free

In Person (view details)

Graphical Dirichlet Process for Clustering Non-Exchangeable Grouped Data

Title: Graphical Dirichlet Process for Clustering Non-Exchangeable Grouped Data

Abstract: We consider the problem of clustering grouped data with possibly non-exchangeable groups whose dependencies can be characterized by a known directed acyclic graph. To allow the sharing of clusters among the non-exchangeable groups, we propose a Bayesian nonparametric approach, termed graphical Dirichlet process, that jointly models the dependent group-specific random measures by assuming each random measure to be distributed as a Dirichlet process whose concentration parameter and base probability measure depend on those of its parent groups. The resulting joint stochastic process respects the Markov property of the directed acyclic graph that links the groups. We characterize the graphical Dirichlet process using a novel hypergraph representation as well as the stick-breaking representation, the restaurant-type representation, and the representation as a limit of a finite mixture model. We develop an efficient posterior inference algorithm and illustrate our model with simulations and a real grouped single-cell data set.

Location

POB 2.302

Subscribe

Share

Audience

Other Events in This Series

Mar

6

2026

SDS Seminar Series – Weining Shen, University of California, Irvine

Statistical Analysis of 3D Path Data in Minecraft

2:00 pm – 3:00 pm • In Person

Speaker(s): Weining Shen

Apr

3

2026

SDS Seminar Series – Leo Duan, University of Florida

Bayesian Distance-to-Set Models: from Latent Variable to Latent Projection

2:00 pm – 3:00 pm • In Person

Speaker(s): Leo Duan

Apr

17

2026

SDS Seminar Series – Rina Foygel Barber, University of Chicago

False Detection Rate Control in Time Series Coincidence Detection

2:00 pm – 3:00 pm • In Person

Speaker(s): Rina Foygel Barber

Sep

11

2026

SDS Seminar Series – Shuangjie Zhang, University of Texas at Austin

Structure Learning for Directed Trees with Zero-Inflated Compositional Nodes

2:00 pm – 3:00 pm • In Person

Speaker(s): Shuangjie Zhang

Sep

25

2026

SDS Seminar Series – Chad Hazlett, University of California, Los Angeles

The Synthetic Confounder: What Pre-Treatment Outcomes Can and Cannot Buy in Longitudinal Causal Inference

2:00 pm – 3:00 pm • In Person

Speaker(s): Chad Hazlett

Oct

2

2026

SDS Seminar Series – Giovanni Toto, University of Texas at Austin

Condition matrix completion for polypharmacy medication information

2:00 pm – 3:00 pm

Speaker(s): Giovanni Toto

Oct

9

2026

SDS Seminar Series – Anirban Bairagi University of Texas at Austin

TBA

2:00 pm – 3:00 pm

Speaker(s): Anirban Bairagi

Oct

16

2026

SDS Seminar Series – Adam Klivans, University of Texas at Austin

TBA

2:00 pm – 3:00 pm

Speaker(s): Adam Klivans

Oct

23

2026

SDS Seminar Series – Casey Breen, University of Texas at Austin

TBD

2:00 pm – 3:00 pm • In Person

Speaker(s): Casey Breen

Oct

30

2026

SDS Seminar Series – Sanjay Shakkottai, University of Texas at Austin

TBA

2:00 pm – 3:00 pm

Speaker(s): Sanjay Shakkottai