Search Results for author: David Dunson

Found 24 papers, 8 papers with code

Spectral Gap Regularization of Neural Networks

no code implementations6 Apr 2023 Edric Tam, David Dunson

We propose to use the Fiedler value of the neural network's underlying graph as a tool for regularization.

Hierarchical shrinkage Gaussian processes: applications to computer code emulation and dynamical system recovery

no code implementations1 Feb 2023 Tao Tang, Simon Mak, David Dunson

A widely-used emulator is the Gaussian process (GP), which provides a flexible framework for efficient prediction and uncertainty quantification.

Gaussian Processes Uncertainty Quantification

Motion-Invariant Variational Auto-Encoding of Brain Structural Connectomes

1 code implementation8 Dec 2022 Yizi Zhang, Meimei Liu, Zhengwu Zhang, David Dunson

We applied the proposed model to data from the Adolescent Brain Cognitive Development (ABCD) study and the Human Connectome Project (HCP) to investigate how our motion-invariant connectomes facilitate understanding of the brain network and its relationship with cognition.

Interpretable AI for relating brain structural and functional connectomes

1 code implementation10 Oct 2022 Haoming Yang, Steven Winter, Zhengwu Zhang, David Dunson

One of the central problems in neuroscience is understanding how brain structure relates to function.

Multiscale Graph Comparison via the Embedded Laplacian Discrepancy

1 code implementation28 Jan 2022 Edric Tam, David Dunson

For comparing graphs that do not have any ambiguities due to basis symmetries (i. e. the spectrums are simple), we show that the ELD becomes a natural pseudo-metric that enjoys nice properties such as invariance under graph isomorphism.

Gaussian Process Subspace Regression for Model Reduction

1 code implementation9 Jul 2021 Ruda Zhang, Simon Mak, David Dunson

In PROM, each parameter point can be associated with a subspace, which is used for Petrov-Galerkin projections of large system matrices.

Model Selection regression +1

Statistical Guarantees for Transformation Based Models with Applications to Implicit Variational Inference

no code implementations23 Oct 2020 Sean Plummer, Shuang Zhou, Anirban Bhattacharya, David Dunson, Debdeep Pati

More recently, transformation-based models have been used in variational inference (VI) to construct flexible implicit families of variational distributions.

Density Estimation Variational Inference

Bayesian neural networks and dimensionality reduction

no code implementations18 Aug 2020 Deborshee Sen, Theodore Papamarkou, David Dunson

We attempt to solve these problems by deploying Markov chain Monte Carlo sampling algorithms (MCMC) for Bayesian inference in ANN models with latent variables.

Bayesian Inference Dimensionality Reduction +1

Principal Ellipsoid Analysis (PEA): Efficient non-linear dimension reduction & clustering

no code implementations17 Aug 2020 Debolina Paul, Saptarshi Chakraborty, Didong Li, David Dunson

In a rich variety of real data clustering applications, PEA is shown to do as well as k-means for simple datasets, while dramatically improving performance in more complex settings.

Clustering Computational Efficiency +1

Fiedler Regularization: Learning Neural Networks with Graph Sparsity

no code implementations ICML 2020 Edric Tam, David Dunson

We propose to use the Fiedler value of the neural network's underlying graph as a tool for regularization.

Bayesian joint modeling of chemical structure and dose response curves

1 code implementation27 Dec 2019 Kelly R. Moran, David Dunson, Amy H. Herring

Our model also enables the prediction of chemical dose-response profiles based on chemical structure (that is, without in vivo or in vitro testing) by taking advantage of a large database of chemicals that have already been tested for toxicity in HTS programs.

Applications

Bayesian Hierarchical Factor Regression Models to Infer Cause of Death From Verbal Autopsy Data

1 code implementation20 Aug 2019 Kelly R. Moran, Elizabeth L. Turner, David Dunson, Amy H. Herring

In low-resource settings where vital registration of death is not routine it is often of critical interest to determine and study the cause of death (COD) for individuals and the cause-specific mortality fraction (CSMF) for populations.

Applications

Stochastic Lipschitz Q-Learning

no code implementations24 Apr 2019 Xu Zhu, David Dunson

To the best of our knowledge, this is the first analysis in the model-free setting whose established regret matches the lower bound up to a logarithmic factor.

Q-Learning Reinforcement Learning (RL)

PiPs: a Kernel-based Optimization Scheme for Analyzing Non-Stationary 1D Signals

no code implementations21 May 2018 Jieren Xu, Yitong Li, Haizhao Yang, David Dunson, Ingrid Daubechies

This paper proposes a novel kernel-based optimization scheme to handle tasks in the analysis, e. g., signal spectral estimation and single-channel source separation of 1D non-stationary oscillatory data.

regression Super-Resolution

Reducing over-clustering via the powered Chinese restaurant process

no code implementations15 Feb 2018 Jun Lu, Meng Li, David Dunson

Dirichlet process mixture (DPM) models tend to produce many small clusters regardless of whether they are needed to accurately characterize the data - this is particularly true for large data sets.

Clustering

Intrinsic Gaussian processes on complex constrained domains

no code implementations3 Jan 2018 Mu Niu, Pokman Cheung, Lizhen Lin, Zhenwen Dai, Neil Lawrence, David Dunson

in-GPs respect the potentially complex boundary or interior conditions as well as the intrinsic geometry of the spaces.

Gaussian Processes valid

Discontinuous Hamiltonian Monte Carlo for discrete parameters and discontinuous likelihoods

1 code implementation23 May 2017 Akihiko Nishimura, David Dunson, Jianfeng Lu

Hamiltonian Monte Carlo has emerged as a standard tool for posterior computation.

Computation

Adaptive posterior convergence rates in non-linear latent variable models

no code implementations26 Jan 2017 Shuang Zhou, Debdeep Pati, Anirban Bhattacharya, David Dunson

In this article, we study rates of posterior contraction in univariate density estimation for a class of non-linear latent variable models where unobserved U(0, 1) latent variables are related to the response variables via a random non-linear regression with an additive error.

Statistics Theory Statistics Theory

No penalty no tears: Least squares in high-dimensional linear models

no code implementations7 Jun 2015 Xiangyu Wang, David Dunson, Chenlei Leng

Ordinary least squares (OLS) is the default method for fitting linear models, but is not applicable for problems with dimensionality larger than the sample size.

regression Vocal Bursts Intensity Prediction

Median Selection Subset Aggregation for Parallel Inference

no code implementations NeurIPS 2014 Xiangyu Wang, Peichao Peng, David Dunson

For massive data sets, efficient computation commonly relies on distributed algorithms that store and process subsets of the data on different machines, minimizing communication costs.

feature selection Model Selection +1

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