Search Results for author: Xin T. Tong

Found 8 papers, 1 papers with code

Sampling in Constrained Domains with Orthogonal-Space Variational Gradient Descent

1 code implementation12 Oct 2022 Ruqi Zhang, Qiang Liu, Xin T. Tong

Sampling methods, as important inference and learning techniques, are typically designed for unconstrained domains.

Fairness

Can We Do Better Than Random Start? The Power of Data Outsourcing

no code implementations17 May 2022 Yi Chen, Jing Dong, Xin T. Tong

Based on three different scenarios, we propose simulation-based algorithms that can utilize a small amount of outsourced data to find good initial points accordingly.

Stochastic Gradient Descent with Dependent Data for Offline Reinforcement Learning

no code implementations6 Feb 2022 Jing Dong, Xin T. Tong

The policy evaluation algorithm is then combined with the policy iteration algorithm to learn the optimal policy.

Q-Learning reinforcement-learning +2

Dimension Independent Generalization Error by Stochastic Gradient Descent

no code implementations25 Mar 2020 Xi Chen, Qiang Liu, Xin T. Tong

One classical canon of statistics is that large models are prone to overfitting, and model selection procedures are necessary for high dimensional data.

Model Selection regression

Replica Exchange for Non-Convex Optimization

no code implementations23 Jan 2020 Jing Dong, Xin T. Tong

Gradient descent (GD) is known to converge quickly for convex objective functions, but it can be trapped at local minima.

On Stationary-Point Hitting Time and Ergodicity of Stochastic Gradient Langevin Dynamics

no code implementations30 Apr 2019 Xi Chen, Simon S. Du, Xin T. Tong

In this paper, using intuitions from stochastic differential equations, we provide a direct analysis for the hitting times of SGLD to the first and second order stationary points.

Stochastic Optimization

Statistical Inference for Model Parameters in Stochastic Gradient Descent

no code implementations27 Oct 2016 Xi Chen, Jason D. Lee, Xin T. Tong, Yichen Zhang

Second, for high-dimensional linear regression, using a variant of the SGD algorithm, we construct a debiased estimator of each regression coefficient that is asymptotically normal.

regression

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