Search Results for author: Russell Greiner

Found 30 papers, 6 papers with code

Early detection of disease outbreaks and non-outbreaks using incidence data

no code implementations13 Apr 2024 Shan Gao, Amit K. Chakraborty, Russell Greiner, Mark A. Lewis, Hao Wang

In summary, we showed that there are statistical features that distinguish outbreak and non-outbreak sequences long before outbreaks occur.

Time Series Time Series Classification

An early warning indicator trained on stochastic disease-spreading models with different noises

1 code implementation24 Mar 2024 Amit K. Chakraborty, Shan Gao, Reza Miry, Pouria Ramazi, Russell Greiner, Mark A. Lewis, Hao Wang

The timely detection of disease outbreaks through reliable early warning signals (EWSs) is indispensable for effective public health mitigation strategies.

Navigate Time Series

Copula-Based Deep Survival Models for Dependent Censoring

no code implementations20 Jun 2023 Ali Hossein Gharari Foomani, Michael Cooper, Russell Greiner, Rahul G. Krishnan

A survival dataset describes a set of instances (e. g. patients) and provides, for each, either the time until an event (e. g. death), or the censoring time (e. g. when lost to follow-up - which is a lower bound on the time until the event).

Survival Analysis Survival Prediction

An Effective Meaningful Way to Evaluate Survival Models

1 code implementation1 Jun 2023 Shi-ang Qi, Neeraj Kumar, Mahtab Farrokh, Weijie Sun, Li-Hao Kuan, Rajesh Ranganath, Ricardo Henao, Russell Greiner

One straightforward metric to evaluate a survival prediction model is based on the Mean Absolute Error (MAE) -- the average of the absolute difference between the time predicted by the model and the true event time, over all subjects.

Survival Prediction

Modeling and Forecasting COVID-19 Cases using Latent Subpopulations

no code implementations9 Feb 2023 Roberto Vega, Zehra Shah, Pouria Ramazi, Russell Greiner

Here, we propose two new methods to model the number of people infected with COVID-19 over time, each as a linear combination of latent sub-populations -- i. e., when we do not know which person is in which sub-population, and the only available observations are the aggregates across all sub-populations.

ECG for high-throughput screening of multiple diseases: Proof-of-concept using multi-diagnosis deep learning from population-based datasets

no code implementations6 Oct 2022 Weijie Sun, Sunil Vasu Kalmady, Amir Salimi, Nariman Sepehrvand, Eric Ly, Abram Hindle, Russell Greiner, Padma Kaul

Electrocardiogram (ECG) abnormalities are linked to cardiovascular diseases, but may also occur in other non-cardiovascular conditions such as mental, neurological, metabolic and infectious conditions.

Domain-shift adaptation via linear transformations

1 code implementation14 Jan 2022 Roberto Vega, Russell Greiner

A predictor, $f_A : X \to Y$, learned with data from a source domain (A) might not be accurate on a target domain (B) when their distributions are different.

Unsupervised Domain Adaptation

Variational Auto-Encoder Architectures that Excel at Causal Inference

no code implementations11 Nov 2021 Negar Hassanpour, Russell Greiner

In this paper, we take a generative approach that builds on the recent advances in Variational Auto-Encoders to simultaneously learn those underlying factors as well as the causal effects.

Causal Inference

SIMLR: Machine Learning inside the SIR model for COVID-19 Forecasting

no code implementations3 Jun 2021 Roberto Vega, Leonardo Flores, Russell Greiner

Accurate forecasts of the number of newly infected people during an epidemic are critical for making effective timely decisions.

BIG-bench Machine Learning

Sample Efficient Learning of Image-Based Diagnostic Classifiers Using Probabilistic Labels

no code implementations11 Feb 2021 Roberto Vega, Pouneh Gorji, Zichen Zhang, Xuebin Qin, Abhilash Rakkunedeth Hareendranathan, Jeevesh Kapur, Jacob L. Jaremko, Russell Greiner

This complicates its use in tasks like image-based medical diagnosis, where the small training datasets are usually insufficient to learn appropriate data representations.

Medical Diagnosis

Shared Space Transfer Learning for analyzing multi-site fMRI data

no code implementations NeurIPS 2020 Muhammad Yousefnezhad, Alessandro Selvitella, Daoqiang Zhang, Andrew J. Greenshaw, Russell Greiner

The optimization procedure extracts the common features for each site by using a single-iteration algorithm and maps these site-specific common features to the site-independent shared space.

Art Analysis Transfer Learning

Learning Disentangled Representations for CounterFactual Regression

no code implementations ICLR 2020 Negar Hassanpour, Russell Greiner

We consider the challenge of estimating treatment effects from observational data; and point out that, in general, only some factors based on the observed covariates X contribute to selection of the treatment T, and only some to determining the outcomes Y.

counterfactual regression +1

Reducing Selection Bias in Counterfactual Reasoning for Individual Treatment Effects Estimation

no code implementations19 Dec 2019 Zichen Zhang, Qingfeng Lan, Lei Ding, Yue Wang, Negar Hassanpour, Russell Greiner

We learn two groups of latent random variables, where one group corresponds to variables that only cause selection bias, and the other group is relevant for outcome prediction.

counterfactual Counterfactual Reasoning +1

Learning Macroscopic Brain Connectomes via Group-Sparse Factorization

1 code implementation NeurIPS 2019 Farzane Aminmansour, Andrew Patterson, Lei Le, Yisu Peng, Daniel Mitchell, Franco Pestilli, Cesar F. Caiafa, Russell Greiner, Martha White

We develop an efficient optimization strategy for this extremely high-dimensional sparse problem, by reducing the number of parameters using a greedy algorithm designed specifically for the problem.

Domain Aggregation Networks for Multi-Source Domain Adaptation

no code implementations ICML 2020 Junfeng Wen, Russell Greiner, Dale Schuurmans

In many real-world applications, we want to exploit multiple source datasets of similar tasks to learn a model for a different but related target dataset -- e. g., recognizing characters of a new font using a set of different fonts.

Domain Adaptation Sentiment Analysis

Simultaneous Prediction Intervals for Patient-Specific Survival Curves

1 code implementation25 Jun 2019 Samuel Sokota, Ryan D'Orazio, Khurram Javed, Humza Haider, Russell Greiner

In this paper, we demonstrate that an existing method for estimating simultaneous prediction intervals from samples can easily be adapted for patient-specific survival curve analysis and yields accurate results.

Descriptive Prediction Intervals +2

The Challenge of Predicting Meal-to-meal Blood Glucose Concentrations for Patients with Type I Diabetes

no code implementations29 Mar 2019 Neil C. Borle, Edmond A. Ryan, Russell Greiner

If we can accurately predict a patient's future BG values from his/her current features (e. g., predicting today's lunch BG value given today's diabetes diary entry for breakfast, including insulin injections, and perhaps earlier entries), then it is relatively easy to produce an effective regimen.

Gene Expression based Survival Prediction for Cancer Patients: A Topic Modeling Approach

no code implementations25 Mar 2019 Luke Kumar, Russell Greiner

As standard survival prediction models have a hard time coping with the high-dimensionality of such gene expression (GE) data, many projects use some dimensionality reduction techniques to overcome this hurdle.

Dimensionality Reduction Survival Prediction

Effective Ways to Build and Evaluate Individual Survival Distributions

2 code implementations28 Nov 2018 Humza Haider, Bret Hoehn, Sarah Davis, Russell Greiner

This paper first motivates such "individual survival distribution" (ISD) models, and explains how they differ from standard models.

Learning Neural Markers of Schizophrenia Disorder Using Recurrent Neural Networks

no code implementations1 Dec 2017 Jumana Dakka, Pouya Bashivan, Mina Gheiratmand, Irina Rish, Shantenu Jha, Russell Greiner

Smart systems that can accurately diagnose patients with mental disorders and identify effective treatments based on brain functional imaging data are of great applicability and are gaining much attention.

Stochastic Neural Networks with Monotonic Activation Functions

no code implementations1 Jan 2016 Siamak Ravanbakhsh, Barnabas Poczos, Jeff Schneider, Dale Schuurmans, Russell Greiner

We propose a Laplace approximation that creates a stochastic unit from any smooth monotonic activation function, using only Gaussian noise.

Boolean Matrix Factorization and Noisy Completion via Message Passing

no code implementations28 Sep 2015 Siamak Ravanbakhsh, Barnabas Poczos, Russell Greiner

Boolean matrix factorization and Boolean matrix completion from noisy observations are desirable unsupervised data-analysis methods due to their interpretability, but hard to perform due to their NP-hardness.

Collaborative Filtering Matrix Completion

Revisiting Algebra and Complexity of Inference in Graphical Models

no code implementations25 Sep 2014 Siamak Ravanbakhsh, Russell Greiner

This paper studies the form and complexity of inference in graphical models using the abstraction offered by algebraic structures.

Augmentative Message Passing for Traveling Salesman Problem and Graph Partitioning

no code implementations NeurIPS 2014 Siamak Ravanbakhsh, Reihaneh Rabbany, Russell Greiner

The cutting plane method is an augmentative constrained optimization procedure that is often used with continuous-domain optimization techniques such as linear and convex programs.

graph partitioning Traveling Salesman Problem

Training Restricted Boltzmann Machine by Perturbation

no code implementations6 May 2014 Siamak Ravanbakhsh, Russell Greiner, Brendan Frey

During the learning, to produce a sample from the current model, we start from a training data and descend in the energy landscape of the "perturbed model", for a fixed number of steps, or until a local optima is reached.

Perturbed Message Passing for Constraint Satisfaction Problems

no code implementations26 Jan 2014 Siamak Ravanbakhsh, Russell Greiner

We introduce an efficient message passing scheme for solving Constraint Satisfaction Problems (CSPs), which uses stochastic perturbation of Belief Propagation (BP) and Survey Propagation (SP) messages to bypass decimation and directly produce a single satisfying assignment.

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