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<!DOCTYPE HTML>
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<title>Zhiqing Xiao - Home</title>
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<a href="index.html" class="logo"><strong>Zhiqing Xiao</strong>, Ph.D.</a>
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<li><a href="https://www.linkedin.com/in/zhiqingxiao" class="icon fa-linkedin"><span class="label">Linkedin</span></a></li>
<li><a href="https://github.com/zhiqingxiao" class="icon fa-github"><span class="label">Github</span></a></li>
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<h1>Zhiqing Xiao</h1>
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<p>Welcome~ 歡迎~ ようこそ~ Bienvenue~ أهلا بك</p>
<p>Zhiqing (he/him) obtained his doctoral degree from Tsinghua University, and he currently works in a bulge bracket investment bank.</p>
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<li class="fa-envelope-o">xzq.xiaozhiqing#gmail.com</li>
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<p>Disclaimer: Opinions expressed in this website are those of Zhiqing, and do not necessarily reflect the view of any organizations or institutions.</p>
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<img src="images/frontpage/zhiqing_front.jpg" alt="Zhiqing Xiao" />
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<h2>Books</h2>
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<article>
<a href="book.html#rlbook" class="image"><img src="images/frontpage/rlbook.jpg" alt="" /></a>
<h3>Reinforcement Learning: Theory and Python Implementation</h3>
<p>A comprehensive tutorial of reinforcement learning that covers the fundamental theory and algorithms with Python implementations. The first RL tutorial book with TensorFlow 2 implementation.</p>
</article>
<article>
<a href="book.html#pytorchbook" class="image"><img src="images/frontpage/pytorchbook.jpg" alt="" /></a>
<h3>Application of Neural Network and PyTorch</h3>
<p>The first hard-copy neural network tutorial book on PyTorch 1.</p>
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<h2>Academic Papers</h2>
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<article>
<a href="https://ieeexplore.ieee.org/document/7247712" class="image"><img src="images/frontpage/xiao2015distributed.jpg" alt="" /></a>
<h3>Distributed Multilevel Diversity Coding</h3>
<p>In distributed multilevel diversity coding, K correlated sources are encoded in a distributed manner such that, given the outputs from any α encoders, the decoder can reconstruct the first α components of each of the corresponding α sources. For this problem, the optimality of a multilayer Slepian-Wolf coding scheme based on binning and superposition is established when K ≤ 3. The same conclusion is shown to hold for general K under a certain symmetry condition, which generalizes a celebrated result by Yeung and Zhang. (Published in IEEE Transactions on Information Theory)</p>
</article>
<article>
<a href="https://ieeexplore.ieee.org/document/7114269" class="image"><img src="images/frontpage/xiao2015allocation.jpg" alt="" /></a>
<h3>Allocation of Network Error Correction Flow to Combat Byzantine Attacks</h3>
<p>This paper studies the allocation of information flows in noiseless, memoryless communication networks in the presence of omniscient Byzantine adversary. In such networks, adversary may maliciously modify some edge-flows, and legitimate users should resort to network error correction strategies to transmit data reliably. Unlike prior papers, which focused on the capacities of the networks, we consider the expense of resources used by the flow. Hereby, this paper uses an optimization problem to define the concept of minimum cost network error correction flows. (Published in IEEE Transactions on Communications)</p>
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<h2>Technical Articles</h2>
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<div class="posts">
<article>
<a href="https://leetcode.com/problems/single-number-iii/discuss/68900/accepted-cjava-on-time-o1-space-easy-solution-with-detail-explanations" class="image"><img src="images/frontpage/single-number-iii.png" alt="single-number-iii" /></a>
<h3>Find Two Unpaired Numbers in a Large Number of Paired Numbers in <i>O</i>(<i>n</i>)-time <i>O</i>(1)-space</h3>
<p>Leetcode solution with most views and upvotes. [<a href="https://leetcode.com/problems/single-number-iii/">Problem</a>][<a href="https://leetcode.com/problems/single-number-iii/discuss/68900/accepted-cjava-on-time-o1-space-easy-solution-with-detail-explanations">Zhiqing's Solution</a>]</p>
</article>
<article>
<a href="https://leetcode.com/problems/add-digits/discuss/68580/accepted-c-o1-time-o1-space-1-line-solution-with-detail-explanations" class="image"><img src="images/frontpage/add-digits.png" alt="add-digits" /></a>
<h3>Find the Digit Root in <i>O</i>(1)-time <i>O</i>(1)-space</h3>
<p>Leetcode solution with most views and upvotes. [<a href="https://leetcode.com/problems/add-digits/">Problem</a>][<a href="https://leetcode.com/problems/add-digits/discuss/68580/accepted-c-o1-time-o1-space-1-line-solution-with-detail-explanations">Zhiqing's Solution</a>]</p>
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<article>
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</section>
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<h2>Media Coverage</h2>
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<div class="posts">
<article>
<a href="https://blog.csdn.net/csdnnews/article/details/102867051" class="image"><img src="images/media/20191101csdn.jpg" alt="" /></a>
<h3>Interview with CSDN</h3>
<p>Interview with Chinese Software Developer Network (CSDN), one of the biggest networks of software developers in China (20191101). <a href="https://blog.csdn.net/csdnnews/article/details/102867051">Full text in Chinese</a></p>
</article>
<article>
<a href="https://cloud.tencent.com/edu/learning/live-2060" class="image"><img src="images/media/20200315tencent.jpg" alt="" /></a>
<h3>Broadcast at Tencent Cloud University</h3>
<p>Broadcast on reinforcement learning (20200315). <a href="https://cloud.tencent.com/edu/learning/live-2060">Video and full text in Chinese</a></p>
</article>
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<h2>Open Source Contributions</h2>
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<div class="features">
<article>
<span class="icons">
<a href="https://scikit-learn.org/0.20/whats_new" class="image"><img src="images/opensource/sklearn.jpg" alt="" /></a>
</span>
<div class="content">
<h3>Sklearn Recognized Zhiqing's Contribution in its Release Note</h3>
<a href="https://scikit-learn.org/0.20/whats_new">sklearn 0.20.0 release note</a> (20190925)
</div>
</article>
<article>
<span class="icons">
<a href="https://docs.scipy.org/doc/scipy-1.0.0/reference/release.1.0.0.html" class="image"><img src="images/opensource/scipy.jpg" alt="" /></a>
</span>
<div class="content">
<h3>Scipy Recognized Zhiqing's Contribution in its Release Note</h3>
<a href="https://docs.scipy.org/doc/scipy/release.1.0.0.html">scipy 1.0.0 release note</a> (20171025)
</div>
</article>
<article>
<span class="icons">
<a href="https://www.statsmodels.org/stable/release/version0.12.html" class="image"><img src="images/opensource/statsmodels.jpg" alt="" /></a>
</span>
<div class="content">
<h3>Statsmodels Recognized Zhiqing's Contribution in its Release Note</h3>
<a href="https://www.statsmodels.org/stable/release/version0.12.html">statsmodels 0.12.0 release note</a> (20200827)
</div>
</article>
<article>
<span class="icons">
<a href="https://github.com/openai/gym/releases/tag/0.19.0" class="image"><img src="images/opensource/gym.jpg" alt="" /></a>
</span>
<div class="content">
<h3>Gym Recognized Zhiqing's Contribution in its Release Note</h3>
<a href="https://github.com/openai/gym/releases/tag/0.19.0">gym 0.19 release note</a> (20210813)
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