Search Results for author: Giovanni Parmigiani

Found 14 papers, 10 papers with code

Multi-source domain adaptation for regression

no code implementations9 Dec 2023 Yujie Wu, Giovanni Parmigiani, Boyu Ren

First, we extend a flexible single-source DA algorithm for classification through outcome-coarsening to enable its application to regression problems.

Domain Adaptation Ensemble Learning +1

Multi-study R-learner for Heterogeneous Treatment Effect Estimation

1 code implementation1 Jun 2023 Cathy Shyr, Boyu Ren, Prasad Patil, Giovanni Parmigiani

To this end, we propose a unifying framework for multi-study heterogeneous treatment effect estimation that is robust to between-study heterogeneity in the nuisance functions and treatment effects.

Defining Replicability of Prediction Rules

no code implementations30 Apr 2023 Giovanni Parmigiani

In this article I propose an approach for defining replicability for prediction rules.

Multi-Task Learning for Sparsity Pattern Heterogeneity: A Discrete Optimization Approach

1 code implementation16 Dec 2022 Gabriel Loewinger, Kayhan Behdin, Kenneth T. Kishida, Giovanni Parmigiani, Rahul Mazumder

Allowing the regression coefficients of tasks to have different sparsity patterns (i. e., different supports), we propose a modeling framework for MTL that encourages models to share information across tasks, for a given covariate, through separately 1) shrinking the coefficient supports together, and/or 2) shrinking the coefficient values together.

Multi-Task Learning Variable Selection

Multi-Study Boosting: Theoretical Considerations for Merging vs. Ensembling

1 code implementation11 Jul 2022 Cathy Shyr, Pragya Sur, Giovanni Parmigiani, Prasad Patil

In the regression setting, we provide theoretical guidelines based on an analytical transition point to determine whether it is more beneficial to merge or to ensemble for boosting with linear learners.

Prediction of Hereditary Cancers Using Neural Networks

1 code implementation25 Jun 2021 Zoe Guan, Giovanni Parmigiani, Danielle Braun, Lorenzo Trippa

We validate the models using data from the Cancer Genetics Network.

Cross-Cluster Weighted Forests

1 code implementation17 May 2021 Maya Ramchandran, Rajarshi Mukherjee, Giovanni Parmigiani

Adapting machine learning algorithms to better handle clustering or batch effects within training data sets is important across a wide variety of biological applications.

Clustering

Extending Models Via Gradient Boosting: An Application to Mendelian Models

1 code implementation13 May 2021 Theodore Huang, Gregory Idos, Christine Hong, Stephen Gruber, Giovanni Parmigiani, Danielle Braun

Via simulations we show that integration of gradient boosting with an existing Mendelian model can produce an improved model that outperforms both that model and the model built using gradient boosting alone.

Representation via Representations: Domain Generalization via Adversarially Learned Invariant Representations

no code implementations20 Jun 2020 Zhun Deng, Frances Ding, Cynthia Dwork, Rachel Hong, Giovanni Parmigiani, Prasad Patil, Pragya Sur

We study an adversarial loss function for $k$ domains and precisely characterize its limiting behavior as $k$ grows, formalizing and proving the intuition, backed by experiments, that observing data from a larger number of domains helps.

Domain Generalization Fairness

Merging versus Ensembling in Multi-Study Prediction: Theoretical Insight from Random Effects

1 code implementation17 May 2019 Zoe Guan, Giovanni Parmigiani, Prasad Patil

A critical decision point when training predictors using multiple studies is whether these studies should be combined or treated separately.

BIG-bench Machine Learning

The Fuzzy ROC

1 code implementation4 Mar 2019 Giovanni Parmigiani

The fuzzy ROC extends Receiver Operating Curve (ROC) visualization to the situation where some data points, falling in an indeterminacy region, are not classified.

Specificity

High-dimensional confounding adjustment using continuous spike and slab priors

1 code implementation25 Apr 2017 Joseph Antonelli, Giovanni Parmigiani, Francesca Dominici

In observational studies, estimation of a causal effect of a treatment on an outcome relies on proper adjustment for confounding.

Methodology

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