Search Results for author: David A. Stephens

Found 5 papers, 3 papers with code

Accelerating Generalized Random Forests with Fixed-Point Trees

1 code implementation20 Jun 2023 David Fleischer, David A. Stephens, Archer Yang

Generalized random forests arXiv:1610. 01271 build upon the well-established success of conventional forests (Breiman, 2001) to offer a flexible and powerful non-parametric method for estimating local solutions of heterogeneous estimating equations.

Stochastic Reweighted Gradient Descent

no code implementations23 Mar 2021 Ayoub El Hanchi, David A. Stephens

Despite the strong theoretical guarantees that variance-reduced finite-sum optimization algorithms enjoy, their applicability remains limited to cases where the memory overhead they introduce (SAG/SAGA), or the periodic full gradient computation they require (SVRG/SARAH) are manageable.

Adaptive Importance Sampling for Finite-Sum Optimization and Sampling with Decreasing Step-Sizes

no code implementations NeurIPS 2020 Ayoub El Hanchi, David A. Stephens

Reducing the variance of the gradient estimator is known to improve the convergence rate of stochastic gradient-based optimization and sampling algorithms.

Stochastic Optimization

A hierarchical Bayesian model for predicting ecological interactions using evolutionary relationships

1 code implementation26 Jul 2017 Mohamad Elmasri, Maxwell Farrell, David A. Stephens

As many interaction networks are constructed from presence-only data, we extend the model by integrating a correction mechanism for missing interactions, which proves valuable in reducing uncertainty in unobserved interactions.

Applications Populations and Evolution

A Bayesian view of doubly robust causal inference

1 code implementation15 Jan 2017 Olli Saarela, Léo R. Belzile, David A. Stephens

In causal inference confounding may be controlled either through regression adjustment in an outcome model, or through propensity score adjustment or inverse probability of treatment weighting, or both.

Methodology 62F15

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