Search Results for author: Michael C. Burkhart

Found 8 papers, 5 papers with code

Unsupervised multimodal modeling of cognitive and brain health trajectories for early dementia prediction

1 code implementation Scientific Reports 2024 Michael C. Burkhart, Liz Y. Lee, Delshad Vaghari, An Qi Toh, Eddie Chong, Christopher Chen, Peter Tiňo, Zoe Kourtzi

In contrast to supervised classification approaches that require labeled data, we propose an unsupervised multimodal trajectory modeling (MTM) approach based on a mixture of state space models that captures changes in longitudinal data (i. e., trajectories) and stratifies individuals without using clinical diagnosis for model training.

Trajectory Modeling

Neuroevolutionary representations for learning heterogeneous treatment effects

1 code implementation Journal of Computational Science 2023 Michael C. Burkhart, Gabriel Ruiz

In contrast to previous approaches that encourage the distribution of representations to be treatment-invariant, we leverage a genetic algorithm that optimizes over representations useful for predicting the outcome to select those less useful for predicting the treatment.

Causal Inference

Deep Low-Density Separation for Semi-Supervised Classification

no code implementations22 May 2022 Michael C. Burkhart, Kyle Shan

Given a small set of labeled data and a large set of unlabeled data, semi-supervised learning (SSL) attempts to leverage the location of the unlabeled datapoints in order to create a better classifier than could be obtained from supervised methods applied to the labeled training set alone.

Classification

Neuroevolutionary Feature Representations for Causal Inference

no code implementations21 May 2022 Michael C. Burkhart, Gabriel Ruiz

Within the field of causal inference, we consider the problem of estimating heterogeneous treatment effects from data.

Causal Inference

Discriminative Bayesian filtering lends momentum to the stochastic Newton method for minimizing log-convex functions

1 code implementation27 Apr 2021 Michael C. Burkhart

To minimize the average of a set of log-convex functions, the stochastic Newton method iteratively updates its estimate using subsampled versions of the full objective's gradient and Hessian.

Sequential Bayesian Inference Stochastic Optimization

The Discriminative Kalman Filter for Bayesian Filtering with Nonlinear and Nongaussian Observation Models

1 code implementation1 May 2020 Michael C. Burkhart, David M. Brandman, Brian Franco, Leigh R. Hochberg, Matthew T. Harrison

Extensions to the Kalman filter, including the extended and unscented Kalman filters, incorporate linearizations for models where the observation model p(observation∣state) is nonlinear.

Brain Computer Interface regression +1

A Discriminative Approach to Bayesian Filtering with Applications to Human Neural Decoding

1 code implementation17 Jul 2018 Michael C. Burkhart

Given a stationary state-space model that relates a sequence of hidden states and corresponding measurements or observations, Bayesian filtering provides a principled statistical framework for inferring the posterior distribution of the current state given all measurements up to the present time.

Sequential Bayesian Inference

The discriminative Kalman filter for nonlinear and non-Gaussian sequential Bayesian filtering

no code implementations23 Aug 2016 Michael C. Burkhart, David M. Brandman, Carlos E. Vargas-Irwin, Matthew T. Harrison

The Kalman filter (KF) is used in a variety of applications for computing the posterior distribution of latent states in a state space model.

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