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<!DOCTYPE html>
<html lang="en">
<head>
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<title>David Xia</title>
<meta name="description" content="David Xia — undergraduate researcher in theoretical machine learning and reinforcement learning at the University of Illinois Urbana-Champaign.">
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<a href="index.html" class="nav-brand">David Xia</a>
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<a href="index.html" class="active">Home</a>
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<main class="wrap">
<!-- ===== Hero ===== -->
<header class="hero">
<div class="hero-text">
<span class="hero-eyebrow">B.S. Computer Science · Mathematics · Statistics</span>
<h1>David Xia <span class="cn-name">夏锦源</span></h1>
<p class="hero-tagline">Theoretical machine learning & reinforcement learning</p>
<p class="hero-bio">
I'm a senior at the University of Illinois Urbana-Champaign studying
computer science, mathematics, and statistics. I work on the theoretical
foundations of machine learning, and I'm applying to CS PhD programs for fall 2027.
</p>
<div class="pill-row">
<a class="pill pill-primary" href="docs/david_xia_cv.pdf" target="_blank"><i class="fas fa-file-lines"></i> Curriculum Vitae</a>
<a class="pill" href="mailto:davidx3@illinois.edu"><i class="fas fa-envelope"></i> Email</a>
<a class="pill" href="https://scholar.google.com/citations?hl=en&user=uScYa6cAAAAJ" target="_blank"><i class="fas fa-graduation-cap"></i> Scholar</a>
<a class="pill" href="https://github.com/davidxia3" target="_blank"><i class="fab fa-github"></i> GitHub</a>
<a class="pill" href="https://www.linkedin.com/in/dx3/" target="_blank"><i class="fab fa-linkedin-in"></i> LinkedIn</a>
</div>
</div>
<div class="hero-portrait-wrap">
<img class="portrait" src="images/david.png" alt="David Xia">
</div>
</header>
<!-- ===== About ===== -->
<section id="about" class="reveal">
<div class="section-label">About</div>
<p class="lede">
My research centers on the theory of sequential decision-making: reinforcement
learning, online learning, and function approximation in Markov decision processes.
I'm drawn to questions of sample and computational complexity — when efficient
learning is provably possible, and the algorithms that achieve it. Alongside this
core focus, I've worked across combinatorics, adversarial machine learning, and
human-centered evaluation of large language models.
</p>
<div class="tag-row">
<span class="tag">Reinforcement Learning</span>
<span class="tag">Online Learning</span>
<span class="tag">MDP Function Approximation</span>
<span class="tag">Sample Complexity</span>
<span class="tag">Learning Theory</span>
</div>
</section>
<!-- ===== News ===== -->
<section id="news" class="reveal">
<div class="section-label">News</div>
<ul class="news-list">
<li class="news-item">
<span class="news-date">May 2026</span>
<span class="news-body">Started a research internship at <strong class="name">Northwestern University</strong> with <a class="name" href="https://zhaoranwang.github.io/" target="_blank">Prof. Zhaoran Wang</a> on agentic reinforcement learning.</span>
</li>
<li class="news-item">
<span class="news-date">Apr 2026</span>
<span class="news-body">Presented our LLM-journalism audit at the <a class="name" href="https://heal-workshop.github.io/" target="_blank">HEAL workshop</a> at <strong class="name">CHI 2026</strong> in Barcelona.</span>
</li>
<li class="news-item">
<span class="news-date">Jun 2026</span>
<span class="news-body"><em>RSK linear operators and the Vershik–Kerov–Logan–Shepp curve</em> was accepted — to appear in the <a class="name" href="https://www.combinatorics.org/" target="_blank">Electronic Journal of Combinatorics</a>.</span>
</li>
<li class="news-item">
<span class="news-date">Feb 2026</span>
<span class="news-body">Joined the <a class="name" href="https://www.idea-isail.com/index.html" target="_blank">iDEA-iSAIL Lab</a> at <span class="name">UIUC</span> with <a class="name" href="http://tonghanghang.org/" target="_blank">Prof. Hanghang Tong</a>, working on theoretical RL.</span>
</li>
<li class="news-item">
<span class="news-date">May 2025</span>
<span class="news-body"><em>EveGuard</em> appeared at the <strong class="name">IEEE Symposium on Security and Privacy 2025</strong>.</span>
</li>
<li class="news-item">
<span class="news-date">Jan 2025</span>
<span class="news-body">Presented sports-predictability research at the <strong class="name">Joint Mathematics Meetings</strong>.</span>
</li>
</ul>
</section>
<!-- ===== Selected Publications ===== -->
<section id="publications" class="reveal">
<div class="section-label">Selected Publications</div>
<div class="pub-list">
<article class="pub">
<span class="pub-year">2026</span>
<div>
<div class="pub-title">Frozen Policy Iteration for MDPs with Stochastic Transitions under Linear Q<sup>π</sup> Realizability</div>
<div class="pub-authors"><span class="me">David Xia</span>, <span class="name">Ruizhong Qiu</span>, <span class="name">Hanghang Tong</span></div>
<div class="pub-venue"><span class="badge">IN PREP</span> Manuscript in preparation</div>
<div class="link-row">
<a class="chip" href="docs/stochastic_fpi.pdf" target="_blank"><i class="fas fa-file-pdf"></i> PDF</a>
</div>
</div>
</article>
<article class="pub">
<span class="pub-year">2025</span>
<div>
<div class="pub-title">RSK linear operators and the Vershik–Kerov–Logan–Shepp curve</div>
<div class="pub-authors"><span class="name">Duy Phan</span>, <span class="me">David Xia</span></div>
<div class="pub-venue"><span class="badge">TO APPEAR</span> Electronic Journal of Combinatorics</div>
<div class="link-row">
<a class="chip arxiv" href="https://arxiv.org/abs/2504.05510" target="_blank"><i class="fas fa-file-lines"></i> arXiv</a>
</div>
</div>
</article>
<article class="pub">
<span class="pub-year">2025</span>
<div>
<div class="pub-title">EveGuard: Defeating Vibration-based Side-Channel Eavesdropping with Audio Adversarial Perturbations</div>
<div class="pub-authors"><span class="name">Jung-Woo Chang</span>, <span class="name">Ke Sun</span>, <span class="me">David Xia</span>, <span class="name">Xinyu Zhang</span>, <span class="name">Farinaz Koushanfar</span></div>
<div class="pub-venue"><span class="badge">PUBLISHED</span> IEEE Symposium on Security and Privacy 2025</div>
<div class="link-row">
<a class="chip arxiv" href="https://arxiv.org/abs/2411.10034" target="_blank"><i class="fas fa-file-lines"></i> arXiv</a>
</div>
</div>
</article>
</div>
<a class="more-link" href="papers.html">View all publications <i class="fas fa-arrow-right"></i></a>
</section>
<!-- ===== Experience ===== -->
<section id="experience" class="reveal">
<div class="section-label">Research Experience</div>
<div class="exp-list">
<div class="exp">
<img class="exp-logo" src="images/logos/northwestern_logo.png" alt="">
<div>
<span class="exp-place name">Northwestern University</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="https://zhaoranwang.github.io/" target="_blank">Zhaoran Wang</a> — agentic reinforcement learning</div>
</div>
<span class="exp-date">May 2026 – present</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/isail_logo.png" alt="">
<div>
<span class="exp-place name">iDEA-iSAIL Lab, UIUC</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="http://tonghanghang.org/" target="_blank">Hanghang Tong</a> — theoretical RL</div>
</div>
<span class="exp-date">Feb 2026 – present</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/iclue_logo.png" alt="">
<div>
<span class="exp-place name">ICLUE, UIUC</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="https://ayong.web.illinois.edu/" target="_blank">Alexander Yong</a> — algebraic combinatorics</div>
</div>
<span class="exp-date">Aug 2024 – present</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/iml_logo.png" alt="">
<div>
<span class="exp-place name">Illinois Mathematics Lab, UIUC</span>
<div class="exp-role">Research Intern · advised by <span class="name">AJ Hildebrand</span> — sports predictability</div>
</div>
<span class="exp-date">Jan 2024 – May 2026</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/cmu_logo.png" alt="">
<div>
<span class="exp-place name">Carnegie Mellon University, HCII</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="https://www.cs.cmu.edu/~jbigham/" target="_blank">Jeff Bigham</a> — LLMs & journalism</div>
</div>
<span class="exp-date">May 2025 – Feb 2026</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/nus_logo.png" alt="">
<div>
<span class="exp-place name">National University of Singapore, SERIUS</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="https://cde.nus.edu.sg/ece/staff/fong-xuanyao-kelvin/" target="_blank">Kelvin Fong Xuanyao</a> — anomaly detection & plant health ML</div>
</div>
<span class="exp-date">May 2024 – Aug 2024</span>
</div>
<div class="exp">
<img class="exp-logo" src="images/logos/ucsd_logo.png" alt="">
<div>
<span class="exp-place name">University of California San Diego</span>
<div class="exp-role">Research Intern · advised by <a class="name" href="https://xyzhang.ucsd.edu/index.html" target="_blank">Xinyu Zhang</a> — adversarial ML</div>
</div>
<span class="exp-date">Jun 2023 – Dec 2024</span>
</div>
</div>
<a class="more-link" href="cv.html">See full CV <i class="fas fa-arrow-right"></i></a>
</section>
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