Search Results for author: Qinxun Bai

Found 11 papers, 2 papers with code

Offline Reinforcement Learning with Closed-Form Policy Improvement Operators

no code implementations29 Nov 2022 Jiachen Li, Edwin Zhang, Ming Yin, Qinxun Bai, Yu-Xiang Wang, William Yang Wang

Behavior constrained policy optimization has been demonstrated to be a successful paradigm for tackling Offline Reinforcement Learning.

D4RL Offline RL +2

A Geometric Understanding of Natural Gradient

no code implementations13 Feb 2022 Qinxun Bai, Steven Rosenberg, Wei Xu

While natural gradients have been widely studied from both theoretical and empirical perspectives, we argue that some fundamental theoretical issues regarding the existence of gradients in infinite dimensional function spaces remain underexplored.

Generative Particle Variational Inference via Estimation of Functional Gradients

no code implementations1 Mar 2021 Neale Ratzlaff, Qinxun Bai, Li Fuxin, Wei Xu

Recently, particle-based variational inference (ParVI) methods have gained interest because they can avoid arbitrary parametric assumptions that are common in variational inference.

Variational Inference

Siamese Natural Language Tracker: Tracking by Natural Language Descriptions with Siamese Trackers

1 code implementation CVPR 2021 Qi Feng, Vitaly Ablavsky, Qinxun Bai, Stan Sclaroff

We propose a novel Siamese Natural Language Tracker (SNLT), which brings the advancements in visual tracking to the tracking by natural language (NL) descriptions task.

Region Proposal Visual Object Tracking +1

Implicit Generative Modeling for Efficient Exploration

no code implementations ICML 2020 Neale Ratzlaff, Qinxun Bai, Li Fuxin, Wei Xu

Each random draw from our generative model is a neural network that instantiates the dynamic function, hence multiple draws would approximate the posterior, and the variance in the future prediction based on this posterior is used as an intrinsic reward for exploration.

Efficient Exploration Future prediction

Real-time Visual Object Tracking with Natural Language Description

no code implementations26 Jul 2019 Qi Feng, Vitaly Ablavsky, Qinxun Bai, Guorong Li, Stan Sclaroff

In benchmarks, our method is competitive with state of the art trackers, while it outperforms all other trackers on targets with unambiguous and precise language annotations.

Object Visual Object Tracking

A Topological Regularizer for Classifiers via Persistent Homology

no code implementations27 Jun 2018 Chao Chen, Xiuyan Ni, Qinxun Bai, Yusu Wang

In particular, our measurement of topological complexity incorporates the importance of topological features (e. g., connected components, handles, and so on) in a meaningful manner, and provides a direct control over spurious topological structures.

A Bayesian Approach for Online Classifier Ensemble

no code implementations8 Jul 2015 Qinxun Bai, Henry Lam, Stan Sclaroff

We propose a Bayesian approach for recursively estimating the classifier weights in online learning of a classifier ensemble.

Class Probability Estimation via Differential Geometric Regularization

no code implementations4 Mar 2015 Qinxun Bai, Steven Rosenberg, Zheng Wu, Stan Sclaroff

We study the problem of supervised learning for both binary and multiclass classification from a unified geometric perspective.

Classification General Classification

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