Search Results for author: Weizi Li

Found 19 papers, 7 papers with code

LASIL: Learner-Aware Supervised Imitation Learning For Long-term Microscopic Traffic Simulation

no code implementations26 Mar 2024 Ke Guo, Zhenwei Miao, Wei Jing, Weiwei Liu, Weizi Li, Dayang Hao, Jia Pan

Due to the covariate shift issue, existing imitation learning-based simulators often fail to generate stable long-term simulations.

Imitation Learning

EnduRL: Enhancing Safety, Stability, and Efficiency of Mixed Traffic Under Real-World Perturbations Via Reinforcement Learning

2 code implementations21 Nov 2023 Bibek Poudel, Weizi Li, Kevin Heaslip

To address this, we introduce a reinforcement learning based RV that employs a congestion stage classifier to optimize the safety, efficiency, and stability of mixed traffic.

Early detection of inflammatory arthritis to improve referrals using multimodal machine learning from blood testing, semi-structured and unstructured patient records

no code implementations30 Oct 2023 Bing Wang, Weizi Li, Anthony Bradlow, Antoni T. Y. Chan, Eghosa Bazuaye

But in practice, blood testing data is not always available at the point of referrals, so we need methods to leverage multimodal data such as semi-structured and unstructured data for early detection of IA.

Conformal Prediction Decision Making +1

Can ChatGPT Enable ITS? The Case of Mixed Traffic Control via Reinforcement Learning

1 code implementation13 Jun 2023 Michael Villarreal, Bibek Poudel, Weizi Li

However, defining objectives of RL agents in traffic control and management tasks, as well as aligning policies with these goals through an effective formulation of Markov Decision Process (MDP), can be challenging and often require domain experts in both RL and ITS.

General Knowledge Management +1

Efficient Quality-Diversity Optimization through Diverse Quality Species

1 code implementation14 Apr 2023 Ryan Wickman, Bibek Poudel, Michael Villarreal, Xiaofei Zhang, Weizi Li

This can be rectified by Quality-Diversity (QD) algorithms, where a population of high-quality and diverse solutions to a problem is preferred.

Mixed Traffic Control and Coordination from Pixels

no code implementations17 Feb 2023 Michael Villarreal, Bibek Poudel, Jia Pan, Weizi Li

In certain scenarios, our approach even outperforms using precision observations, e. g., up to 8% increase in average vehicle velocity in the merge environment, despite only using local traffic information as opposed to global traffic information.

Reinforcement Learning (RL)

Learning to Control and Coordinate Mixed Traffic Through Robot Vehicles at Complex and Unsignalized Intersections

1 code implementation12 Jan 2023 Dawei Wang, Weizi Li, Lei Zhu, Jia Pan

In contrast, without RVs, congestion starts to develop when the traffic demand reaches as low as 200 vehicles per hour.

Multi-agent Reinforcement Learning

AutoJoin: Efficient Adversarial Training for Robust Maneuvering via Denoising Autoencoder and Joint Learning

no code implementations22 May 2022 Michael Villarreal, Bibek Poudel, Ryan Wickman, Yu Shen, Weizi Li

As a result of increasingly adopted machine learning algorithms and ubiquitous sensors, many 'perception-to-control' systems are developed and deployed.

Denoising

A Generic Graph Sparsification Framework using Deep Reinforcement Learning

1 code implementation2 Dec 2021 Ryan Wickman, Xiaofei Zhang, Weizi Li

The interconnectedness and interdependence of modern graphs are growing ever more complex, causing enormous resources for processing, storage, communication, and decision-making of these graphs.

Decision Making reinforcement-learning +1

Gradient-Free Adversarial Training Against Image Corruption for Learning-based Steering

no code implementations NeurIPS 2021 Yu Shen, Laura Zheng, Manli Shu, Weizi Li, Tom Goldstein, Ming Lin

We introduce a simple yet effective framework for improving the robustness of learning algorithms against image corruptions for autonomous driving.

Autonomous Driving Self-Driving Cars

Network-wide Multi-step Traffic Volume Prediction using Graph Convolutional Gated Recurrent Neural Network

1 code implementation22 Nov 2021 Lei Lin, Weizi Li, Lei Zhu

For instance, our model reduces MAE by 25. 3%, RMSE by 29. 2%, and MAPE by 20. 2%, compared to the state-of-the-art Diffusion Convolutional Recurrent Neural Network (DCRNN) model using the hourly dataset.

Black-box Adversarial Attacks on Network-wide Multi-step Traffic State Prediction Models

1 code implementation17 Oct 2021 Bibek Poudel, Weizi Li

While the prediction accuracy of deep learning models is high, these models' robustness has raised many safety concerns, given that imperceptible perturbations added to input can substantially degrade the model performance.

Adversarial Attack

LRN: Limitless Routing Networks for Effective Multi-task Learning

no code implementations29 Sep 2021 Ryan Wickman, Xiaofei Zhang, Weizi Li

Multi-task learning (MTL) is a field involved with learning multiple tasks simultaneously typically through using shared model parameters.

Multi-Task Learning

Analyzing Effects of The COVID-19 Pandemic on Road Traffic Safety: The Cases of New York City, Los Angeles, and Boston

no code implementations10 Aug 2021 Lahari Karadla, Weizi Li

The COVID-19 pandemic has resulted in significant social and economic impacts throughout the world.

Learning to Control DC Motor for Micromobility in Real Time with Reinforcement Learning

no code implementations31 Jul 2021 Bibek Poudel, Thomas Watson, Weizi Li

Autonomous micromobility has been attracting the attention of researchers and practitioners in recent years.

Reinforcement Learning (RL)

Improving Robustness of Learning-based Autonomous Steering Using Adversarial Images

no code implementations26 Feb 2021 Yu Shen, Laura Zheng, Manli Shu, Weizi Li, Tom Goldstein, Ming C. Lin

For safety of autonomous driving, vehicles need to be able to drive under various lighting, weather, and visibility conditions in different environments.

Autonomous Driving Data Augmentation +1

Driving through the Lens: Improving Generalization of Learning-based Steering using Simulated Adversarial Examples

no code implementations1 Jan 2021 Yu Shen, Laura Yu Zheng, Manli Shu, Weizi Li, Tom Goldstein, Ming Lin

To ensure the wide adoption and safety of autonomous driving, the vehicles need to be able to drive under various lighting, weather, and visibility conditions in different environments.

Autonomous Driving Data Augmentation +2

Imperatives for Virtual Humans

no code implementations19 Apr 2020 Weizi Li, Jan M. Allbeck

Seemingly since the inception of virtual humans, there has been an effort to make their behaviors more natural and human-like.

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