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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Mengdi Xu</title>
<meta name="author" content="Mengdi Xu">
<meta name="viewport" content="width=900">
<link rel="stylesheet" type="text/css" href="stylesheet.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="icon" type="image/png" href="images/cmulogo.png">
<!-- <script src=”main.js” defer></script> -->
</head>
<body>
<br>
<br>
<table width="800" border="0" align="center" cellspacing="0" cellpadding="0">
<tr>
<td>
<h2> Publications </h2>
<p>(* indicates equal contribution.)</p>
<br>
<!-- Publications 2024 -->
<h4> 2024 </h4>
<hr>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/SUM_APM.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Embodied Executable Policy Learning with Language-based Scene Summarization
</papertitle>
<br>
<a href="https://www.cs.cmu.edu/~jielinq/"><author>Jielin Qiu</author>*</a>,
<strong>Mengdi Xu*</strong>,
<a href="https://willxxy.github.io/"><author>William Han</author>*</a>,
<a href="https://shanemoon.com/"><author>Seungwhan Moon</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
2024 Annual Conference of the North American Chapter of the Association for Computational Linguistics (NAACL)
<br>
Abridged in ICML 2023 Workshop on Interactive Learning with Implicit Human Feedback <strong style="color:#B908C5">(spotlight)</strong><br>
<a href="https://arxiv.org/pdf/2306.05696.pdf">[paper]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/GYF.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Guardians as You Fall: Active Mode Transition for Safe Falling
</papertitle>
<br>
<a href="https://www.cs.cmu.edu/~jielinq/"><author>Yikai Wang</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://www.gshi.me/"><author>Guanya Shi</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Preprint, under review
<br>
<a href="https://arxiv.org/pdf/2310.04828.pdf">[paper]</a>
<a href="https://sites.google.com/view/guardians-as-you-fall/">[website]</a>
<a href="https://github.com/ykwang20/Guardians_as_You_Fall">[code]</a>
<a href="https://www.youtube.com/watch?v=e0ORrUjrncc">[video]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2023 -->
<h4> 2023 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/robotool.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Creative Robot Tool Use with Large Language Models</papertitle>
<br>
<strong>Mengdi Xu*</strong>,
<a href="https://peidehuang.github.io/"><author>Peide Huang*</author></a>,
<a href="https://wenhaoyu.weebly.com/"><author>Wenhao Yu*</author></a>,
<a href="https://scholar.google.com/citations?user=PiuAi5wAAAAJ&hl=en&oi=ao"><author>Shiqi Liu</author></a>,
<a href="https://scholar.google.com/citations?user=BnlIUZoAAAAJ&hl=en"><author>Xilun Zhang</author></a>,
<a href="https://yaruniu.com/"><author>Yaru Niu</author></a>,
<a href="https://scholar.google.com/citations?user=RM2vMNcAAAAJ&hl=en"><author>Tingnan Zhang</author></a>,
<a href="https://fxia22.github.io/"><author>Fei Xia</author></a>,
<a href="https://www.jie-tan.net/"><author>Jie Tan</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Preprint.
<br>
Abridged in CoRL 2023 Workshop on Language and Robot Learning: Language as Grounding
<br>
<a href="https://arxiv.org/pdf/2310.13065.pdf">[paper]</a>
<a href="https://creative-robotool.github.io/">[webpage]</a>
<a href="https://blog.ml.cmu.edu/2023/12/08/creative-robot-tool-use-with-large-language-models/">[MLD Blog]</a>
<a href="https://techxplore.com/news/2023-11-robots-tools-creatively-leveraging-large.html">[TechXplore]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/covers.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Continual Vision-based Reinforcement Learning with Group Symmetries</papertitle>
<br>
<a href="https://scholar.google.com/citations?user=PiuAi5wAAAAJ&hl=en&oi=ao"><author>Shiqi Liu*</author></a>,
<strong>Mengdi Xu*</strong>,
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<a href="https://scholar.google.com/citations?user=uRvYtOgAAAAJ&hl=en"><author>Yongkang Liu</author></a>,
<a href="https://www.linkedin.com/in/ken-oguchi-a89b263/"><author>Kentaro Oguchi</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Conference on Robot Learning (<strong>CoRL</strong>), 2023 <strong style="color:#B908C5">(oral, 6.6%)</strong>
<br>
Abridged in RSS 2023 Workshop on Symmetries in Robot Learning<br>
<a href="https://arxiv.org/pdf/2210.12301.pdf">[paper]</a>
<a href="https://sites.google.com/view/rl-covers/">[webpage]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/RDM.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Adaptive Online Replanning with Diffusion Models</papertitle>
<br>
<a href="https://openreview.net/profile?id=~Siyuan_Zhou2"><author>Siyuan Zhou</author></a>,
<a href="https://yilundu.github.io/"><author>Yilun Du</author></a>,
<a href="https://shunzh.github.io/"><author>Shun Zhang</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://mitibmwatsonailab.mit.edu/people/yikang-shen/"><author>Yikang Shen</author></a>,
<a href="https://scholar.google.com/citations?user=BxdZJNQAAAAJ&hl=en"><author>Wei Xiao</author></a>,
<a href="https://scholar.google.com/citations?user=nEsOOx8AAAAJ&hl=en%22%22"><author>Dit-Yan Yeung</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Chuang Gan</author></a>
<br>
Thirty-seventh Conference on Neural Information Processing Systems (<strong>NeurIPS</strong>), 2023
<br>
<a href="https://arxiv.org/pdf/2310.09629.pdf">[paper]</a>
<a href="https://vis-www.cs.umass.edu/replandiffuser/">[webpage]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/compass.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>What Went Wrong? Closing the Sim-to-Real Gap via Differentiable Causal Discovery</papertitle>
<br>
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<a href="https://scholar.google.com/citations?user=BnlIUZoAAAAJ&hl=en"><author>Xilun Zhang*</author></a>,
Ziang Cao*,
<a href="https://scholar.google.com/citations?user=PiuAi5wAAAAJ&hl=en&oi=ao"><author>Shiqi Liu*</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://wenhao.pub/"><author>Wenhao Ding</author></a>,
<a href="https://scholar.google.com/citations?user=7CLS0LwAAAAJ&hl=en"><author>Jonathan Francis</author></a>,
<a href="https://scholar.google.com/citations?user=LYt_2MgAAAAJ&hl=en"><author>Bingqing Chen</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Conference on Robot Learning (<strong>CoRL</strong>), 2023
<br>
Abridged in IROS 2023 Workshop on Causality for Robotics: Answering the Question of Why.<br>
<a href="https://arxiv.org/pdf/2306.15864.pdf">[paper]</a>
<a href="https://sites.google.com/view/sim2real-compass">[webpage]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/HDT.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Hyper-Decision Transformer for Efficient Online Policy Adaptation</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="http://jackhaha363.github.io/"><author>Yuchen Lu</author></a>,
<a href="https://mitibmwatsonailab.mit.edu/people/yikang-shen/"><author>Yikang Shen</author></a>,
<a href="https://shunzh.github.io/"><author>Shun Zhang</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>,
<a href="http://people.csail.mit.edu/ganchuang/"><author>Chuang Gan</author></a>
<br>
The Eleventh International Conference on Learning Representations (<strong>ICLR</strong>), 2023
<br>
<a href="https://arxiv.org/pdf/2304.08487.pdf">[paper]</a>
<a href="https://sites.google.com/view/hdtforiclr2023/home">[webpage]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/DRO.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Group Distributionally Robust Reinforcement Learning with Hierarchical Latent Variables
</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<a href="https://yaruniu.com/"><author>Yaru Niu</author></a>,
<a href="https://www.visakkumar.com/"><author>Visak Kumar</author></a>,
<a href="https://www.cs.cmu.edu/~jielinq/"><author>Jielin Qiu</author></a>,
<a href="https://scholar.google.com/citations?user=nU8VhKYAAAAJ&hl=en"><author>Chao Fang</author></a>,
<a href="https://scholar.google.com/citations?user=u8K7nOwAAAAJ&hl=en"><author>Kuan-Hui Lee</author></a>,
<a href="https://scholar.google.com/citations?user=pOA6uKMAAAAJ&hl=en"><author>Xuewei Qi</author></a>,
<a href="http://www.columbia.edu/~khl2114/"><author>Henry Lam</author></a>,
<a href="https://aisecure.github.io/"><author>Bo Li</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
The 26th International Conference on Artificial Intelligence and Statistics, (<strong>AISTATS</strong>), 2023
<br>
Abridged in ICML 2022 workshop on Principles of Distribution Shift.
<br>
Abridged in ICRA 2022 the Fresh Perspectives on the Future of Autonomous Driving Workshop
<br>
<a href="https://arxiv.org/pdf/2210.12262.pdf">[paper]</a>
<a href="https://sites.google.com/view/gdr-rl/home">[webpage]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/DTd.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>A trajectory is worth three sentences: multimodal transformer for offline reinforcement learning
</papertitle>
<br>
<a href="https://scholar.google.com/citations?user=Rz3bmE8AAAAJ&hl=en&oi=ao"><author>Yiqi Wang</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://laixishi.github.io/"><author>Laixi Shi</author></a>,
<a href="https://users.ece.cmu.edu/~yuejiec/"><author>Yuejie Chi</author></a>
<br>
Proceedings of the Thirty-Ninth Conference on Uncertainty in Artificial Intelligence, (<strong>UAI</strong>), 2023
<br>
<a href="https://proceedings.mlr.press/v216/wang23d/wang23d.pdf">[paper]</a>
<a href="https://github.com/berniewang8177/Official-codebase-for-Decision-Transducer/">[code]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/ECGNLP.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Transfer Knowledge from Natural Language to Electrocardiography: Can We Detect Cardiovascular Disease Through Language Models?
</papertitle>
<br>
<a href="https://www.cs.cmu.edu/~jielinq/"><author>Jielin Qiu</author></a>,
<a href="https://willxxy.github.io/"><author>William Han</author></a>,
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu</author></a>,
<strong>Mengdi Xu</strong>,
Michael Rosenberg,
Emerson Liu,
<a href="https://scholar.google.com/citations?user=7iFu3a4AAAAJ&hl=en"><author>Douglas Weber</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
The 17th Conference of the European Chapter of the Association for Computational Linguistics (<strong>EACL</strong>), 2023
<br>
<a href="https://arxiv.org/pdf/2301.09017.pdf">[paper]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2022 -->
<h4> 2022 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/gradient.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Curriculum Reinforcement Learning using Optimal Transport via Gradual Domain Adaptation
</papertitle>
<br>
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu</author></a>,
<a href="https://www.andrew.cmu.edu/user/laixis/"><author>Laixi Shi</author></a>,
<a href="https://feifang.info/"><author>Fei Fang</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>,
<br>
The 36th Conference on Neural Information Processing Systems, (<strong>NeurIPS</strong>), 2022
<br>
<a href="https://arxiv.org/pdf/2210.10195.pdf">[paper]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/Prompt_DT_website.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Prompting Decision Transformer for Few-shot Policy Generalization
</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="https://mitibmwatsonailab.mit.edu/people/yikang-shen/"><author>Yikang Shen</author></a>,
<a href="https://shunzh.github.io/"><author>Shun Zhang</author></a>,
<a href="http://jackhaha363.github.io/"><author>Yuchen Lu</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>,
<a href="http://web.mit.edu/cocosci/josh.html"><author>Josh Tenenbaum</author></a>,
<a href="http://people.csail.mit.edu/ganchuang/"><author>Chuang Gan</author></a>
<br>
Thirty-ninth International Conference on Machine Learning (<strong>ICML</strong>), 2022
<br>
<a href="https://arxiv.org/pdf/2206.13499.pdf">[paper]</a>
<a href="https://mxu34.github.io/PromptDT/">[webpage]</a>
<a href="https://github.com/mxu34/prompt-dt">[code]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/APE.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Scalable Safety-Critical Policy Evaluation with Accelerated Rare Event Sampling
</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<a href="https://www.linkedin.com/in/fengpei-li-242526145/"><author>Fengpei Li</author></a>,
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu</author></a>,
<a href="https://scholar.google.com/citations?user=pOA6uKMAAAAJ&hl=en"><author>Xuewei Qi</author></a>,
<a href="https://www.linkedin.com/in/ken-oguchi-a89b263/"><author>Kentaro Oguchi</author></a>,
<a href="https://sites.google.com/view/zyhuang"><author>Zhiyuan Huang</author></a>,
<a href="http://www.columbia.edu/~khl2114/"><author>Henry Lam</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
IEEE/RSJ International Conference on Intelligent Robots and Systems (<strong>IROS</strong>), 2022
<br>
Abridged in ICLR 2021 Workshop in Security and Safety in Machine Learning Systems
<br>
<a href="https://arxiv.org/pdf/2106.10566.pdf">[paper]</a>
<a href="data/ape.txt">[bibtex]</a>
<a href="https://aisecure-workshop.github.io/aml-iclr2021/">[workshop]</a>
<a href="data/APE_ICLR2021Workshop_poster.pdf">[poster]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/rrl-stack.gif" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Robust Reinforcement Learning as a Stackelberg Game via Adaptively-Regularized Adversarial Training
</papertitle>
<br>
<a href="https://peidehuang.github.io/"><author>Peide Huang</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://feifang.info/"><author>Fei Fang</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
International Joint Conference on Artificial Intelligence (<strong>IJCAI</strong>), 2022
<br>
<a href="https://arxiv.org/pdf/2202.09514.pdf">[paper]</a>
<a href="data/stack-rrl.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/TRL.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Trustworthy Reinforcement Learning Against Intrinsic Vulnerabilities: Robustness, Safety, and Generalizability
</papertitle>
<br>
<strong>Mengdi Xu*</strong>,
<a href="https://zuxin.me/"><author>Zuxin Liu</author>*</a>,
<a href="https://peidehuang.github.io/"><author>Peide Huang</author>*</a>,
<a href="https://wenhao.pub/"><author>Wenhao Ding</author></a>,
<a href="https://scholar.google.com/citations?user=M-X3Q-UAAAAJ&hl=en&oi=ao"><author>Zhepeng Cen</author></a>,
<a href="https://aisecure.github.io/"><author>Bo Li</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Preprint, under review
<br>
<a href="https://arxiv.org/pdf/2209.08025.pdf">[paper]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2021 -->
<h4> 2021 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/context_RL.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Context-Aware Safe Reinforcement Learning for Non-Stationary Environments
</papertitle>
<br>
<a href="https://scholar.google.com/citations?user=zxMrNxEAAAAJ&hl=en&oi=ao"><author>Baiming Chen</author></a>,
<a href="https://zuxin.me/"><author>Zuxin Liu</author></a>,
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://wenhao.pub/"><author>Wenhao Ding</author></a>,
Liang Li,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
IEEE International Conference on Robotics and Automation (<strong>ICRA</strong>), 2021<br>
<a href="https://arxiv.org/pdf/2101.00531.pdf">[paper]</a>
<a href="data/context_RL.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
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<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/dmdpn.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Delay-Aware Model-Based Reinforcement Learning for Continuous Control
</papertitle>
<br>
<a href="https://scholar.google.com/citations?user=zxMrNxEAAAAJ&hl=en&oi=ao"><author>Baiming Chen</author></a>,
<strong>Mengdi Xu</strong>,
Liang Li,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
<strong>Neurocomputing</strong>, 2021<br>
<a href="https://arxiv.org/pdf/2005.05440.pdf">[paper]</a>
<a href="https://github.com/baimingc/Delay-aware-MBRL">[code]</a>
<a href="data/da-mbrl.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/FOT_arm.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Functional Optimal Transport: Map Estimation and Domain Adaptation for Functional data
</papertitle>
<br>
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu*</author></a>,
<a href="http://www-personal.umich.edu/~aritra/"><author>Aritra Guha*</author></a>,
<a href="https://dodat619.github.io/"><author>Dat Do*</author></a>,
<strong>Mengdi Xu</strong>,
<a href="http://dept.stat.lsa.umich.edu/~xuanlong/"><author>XuanLong Nguyen</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
JMLR<br>
Abridged in AAAI OT-SDM 2022 workshop <strong style="color:#B908C5">(spotlight)</strong><br>
<a href="https://arxiv.org/pdf/2102.03895.pdf">[paper]</a>
<a href="https://github.com/VersElectronics/FOT">[code]</a>
<a href="data/fot.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
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<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/da-marl.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Delay-Aware Multi-Agent Reinforcement Learning
</papertitle>
<br>
<a href="https://scholar.google.com/citations?user=zxMrNxEAAAAJ&hl=en&oi=ao"><author>Baiming Chen</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://zuxin.me/"><author>Zuxin Liu</author></a>,
Liang Li,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Preprint, under review<br>
<a href="https://arxiv.org/pdf/2205.05441.pdf">[paper]</a>
<a href="https://github.com/baimingc/delay-aware-MARL">[code]</a>
<a href="data/da-marl.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2020 -->
<h4> 2020 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/mbrl-gpmm.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Task-Agnostic Online Reinforcement Learning with an Infinite Mixture of Gaussian Processes
</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="https://wenhao.pub/"><author>Wenhao Ding</author></a>,
<a href="https://jiachengzhuml.github.io/"><author>Jiacheng Zhu</author></a>,
<a href="https://zuxin.me/"><author>Zuxin Liu</author></a>,
<a href="https://scholar.google.com/citations?user=zxMrNxEAAAAJ&hl=en&oi=ao"><author>Baiming Chen</author></a>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
Thirty-fourth Conference on Neural Information Processing Systems (<strong>NeurIPS</strong>), 2020<br>
<a href="https://arxiv.org/pdf/2006.11441.pdf">[paper]</a>
<a href="https://papers.nips.cc/paper/2020/hash/47951a40efc0d2f7da8ff1ecbfde80f4-Abstract.html" >[video]</a>
<a href="https://github.com/mxu34/mbrl-gpmm">[code]</a>
<a href="data/mbrl-gpmm.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/CMTS.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>CMTS: Conditional Multiple Trajectory Synthesizer for Generating Safety-critical Driving Scenarios
</papertitle>
<br>
<a href="https://wenhao.pub/"><author>Wenhao Ding</author></a>,
<strong>Mengdi Xu</strong>,
<a href="https://www.meche.engineering.cmu.edu/directory/bios/zhao-ding.html"><author>Ding Zhao</author></a>
<br>
International Conference on Robotics and Automation (<strong>ICRA</strong>), 2020<br>
<a href="https://arxiv.org/pdf/1910.00099.pdf">[paper]</a>
<a href="https://github.com/GilgameshD/ICRA2020-CMTS">[code]</a>
<a href="data/cmts.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2019 -->
<h4> 2019 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/Mosquito_Staging.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Mosquito staging apparatus for producing PfSPZ malaria vaccines</papertitle>
<br>
<strong>Mengdi Xu</strong>,
Shengnan Lyu,
Yingtian Xu,
Can Kocabalkanli,
Brian K. Chirikjian,
John S. Chirikjian,
Joshua Davis,
Jin Seob Kim,
<a href="https://amiro.lcsr.jhu.edu/IulianIordachita/"><author>Iulian Iordachita</author></a>,
<a href="https://www.cs.jhu.edu/~rht/"><author>Russell H. Taylor</author></a>,
<a href="https://me.jhu.edu/faculty/gregory-s-chirikjian/"><author>Gregory S. Chirikjian</author></a>
<br>
IEEE 15th International Conference on Automation Science and Engineering (<strong>CASE</strong>), 2019<br>
<a href="https://rpk.lcsr.jhu.edu/wp-content/uploads/2019/10/Mosquito-Staging-Apparatus-for-Producing-PfSPZ-Malaria-Vaccines.pdf">[paper]</a>
<a href="data/Mosquito_Staging.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/Mosquito_Vision.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Multi-Mosquito Object Detection and 2D Pose Estimation for Automation of PfSPZ Malaria Vaccine Production</papertitle>
<br>
<a href="https://hongtaowu67.github.io/"><author>Hongtao Wu</author></a>,
Jiteng Mu,
Ting Da,
<strong>Mengdi Xu</strong>,
<a href="https://www.cs.jhu.edu/~rht/"><author>Russell H. Taylor</author></a>,
<a href="https://amiro.lcsr.jhu.edu/IulianIordachita/"><author>Iulian Iordachita</author></a>,
<a href="https://me.jhu.edu/faculty/gregory-s-chirikjian/"><author>Gregory S. Chirikjian</author></a>
<br>
IEEE 15th International Conference on Automation Science and Engineering (<strong>CASE</strong>), 2019<br>
<a href="https://rpk.lcsr.jhu.edu/wp-content/uploads/2019/10/Multi-Mosquito-Object-Detection-and-2D-Pose-Estimation-for-Automation-of-PfSPZ-Malaria-Vaccine-Production.pdf">[paper]</a>
<a href="data/Mosquito_Vision.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<!-- Publications 2018 -->
<h4> 2018 </h4>
<hr>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/DirectionCosine2.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Recovering a Rotation Matrix From Three Direction Cosines</papertitle>
<br>
<strong>Mengdi Xu</strong>,
<a href="https://me.jhu.edu/faculty/gregory-s-chirikjian/"><author>Gregory S. Chirikjian</author></a>
<br>
ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (<strong>IDETC-CIE</strong>), 2018<br>
<a href="data/DETC2018-ThreeDirectionCosine.pdf">[paper]</a>
<a href="data/DirectionCosine.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
<table width="800" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="width:35%; vertical-align:middle; padding-right: 20px;">
<div class="image-container">
<img src="images/honeybee.png" width="100%">
</div>
</td>
<td style="width:65%; vertical-align:middle">
<papertext>
<papertitle>Influence of hydrodynamic pressure and vein strength on the super-elasticity of honeybee wings</papertitle>
<br>
Jieliang Zhao*,
<strong>Mengdi Xu*</strong>
Youjian Liang,
Shaoze Yan,
Wendong Niu
<br>
<strong>Journal of insect physiology</strong>, 2018<br>
<a href="https://www.sciencedirect.com/science/article/abs/pii/S0022191018301859">[paper]</a>
<a href="data/honeybee.txt">[bibtex]</a>
</papertext>
</td>
</tr>
</table>
<br>
</td>
</tr>
</table>
<br>
<br>
<table width="800" border="0" align="center" cellspacing="0" cellpadding="0">
<tr>
<td>
<p align="right">
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