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

1

2024

SDS Seminar Series – Dr. Laura Hatfield

Predict, Correct, Select: A New General Identification Strategy for Controlled Pre-Post Designs

2:00 pm – 3:00 pm • Virtual

Speaker(s): Laura Hatfield

Mar

22

2024

SDS Seminar Series – Dr. Sivaraman Balakrishnan

Statistical Inference for Optimal Transport

2:00 pm – 3:00 pm • In Person

Speaker(s): Sivaraman Balakrishnan

Mar

29

2024

SDS Seminar Series – Dr. Purna Sarkar

Some New Results for Streaming Principal Component Analysis

2:00 pm – 3:00 pm • In Person

Speaker(s): Purna Sarkar

Apr

12

2024

SDS Seminar Series – Dr. Daniela Witten

Data Thinning and Its Applications

2:00 pm – 3:00 pm • In Person

Apr

19

2024

SDS Seminar Series – Dr. William Rosenberger

Design and Inference for Enrichment Trials with a Continuous Biomarker

2:00 pm – 3:00 pm • In Person

Speaker(s): William Rosenberger

Apr

26

2024

SDS Seminar Series – Dr. Bodhisattva Sen

Extending the Scope of Nonparametric Empirical Bayes

2:00 pm – 3:00 pm • In Person

Speaker(s): Bodhisattva Sen

Sep

6

2024

SDS Seminar Series – Christine Peterson, University of Texas MD Anderson Cancer Center

New Methods for Microbiome Data Integration

2:00 pm – 3:00 pm • In Person

Speaker(s): Christine Peterson

Sep

13

2024

SDS Seminar Series – Matthew Vanaman, University of Texas at Austin

Data Analysis from the Zoo to the Wild and Back

2:00 pm – 3:00 pm • In Person

Speaker(s): Matthew Vanaman

Sep

20

2024

SDS Seminar Series – Saptarshi Roy, University of Texas at Austin

On the Computational Complexity of Private High-dimensional Model Selection

2:00 pm – 3:00 pm • In Person

Speaker(s): Saptarshi Roy

Sep

27

2024

SDS Seminar Series – Abhra Sarkar, University of Texas at Austin

(Bayesian) Semiparametric Local Inference (and Other Stories)

2:00 pm – 3:00 pm • In Person

Speaker(s): Abhra Sarkar