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2025-12-28 20:42:55 +00:00
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2016 - 2016 -
2025 2025
Eric X. Liu Eric X. Liu
<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/30f639d">[30f639d]</a></section></footer></main><script src=/js/coder.min.6ae284be93d2d19dad1f02b0039508d9aab3180a12a06dcc71b0b0ef7825a317.js integrity="sha256-auKEvpPS0Z2tHwKwA5UI2aqzGAoSoG3McbCw73gloxc="></script><script defer src=https://static.cloudflareinsights.com/beacon.min.js data-cf-beacon='{"token": "987638e636ce4dbb932d038af74c17d1"}'></script></body></html> <a href="https://git.ericxliu.me/eric/ericxliu-me/commit/13a094e">[13a094e]</a></section></footer></main><script src=/js/coder.min.6ae284be93d2d19dad1f02b0039508d9aab3180a12a06dcc71b0b0ef7825a317.js integrity="sha256-auKEvpPS0Z2tHwKwA5UI2aqzGAoSoG3McbCw73gloxc="></script><script defer src=https://static.cloudflareinsights.com/beacon.min.js data-cf-beacon='{"token": "987638e636ce4dbb932d038af74c17d1"}'></script></body></html>

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2016 - 2016 -
2025 2025
Eric X. Liu Eric X. Liu
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2016 - 2016 -
2025 2025
Eric X. Liu Eric X. Liu
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2016 - 2016 -
2025 2025
Eric X. Liu Eric X. Liu
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<!doctype html><html lang=en><head><title>Eric X. Liu's Personal Page</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=color-scheme content="light dark"><meta http-equiv=Content-Security-Policy content="upgrade-insecure-requests; block-all-mixed-content; default-src 'self'; child-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdn.jsdelivr.net/; form-action 'self'; frame-src 'self' https://www.youtube.com https://disqus.com; img-src 'self' https://referrer.disqus.com https://c.disquscdn.com https://*.disqus.com; object-src 'none'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com/ https://cdn.jsdelivr.net/; script-src 'self' 'unsafe-inline' https://www.google-analytics.com https://cdn.jsdelivr.net/ https://pagead2.googlesyndication.com https://static.cloudflareinsights.com https://unpkg.com https://ericxliu-me.disqus.com https://disqus.com https://*.disqus.com https://*.disquscdn.com https://unpkg.com; connect-src 'self' https://www.google-analytics.com https://pagead2.googlesyndication.com https://cloudflareinsights.com ws://localhost:1313 ws://localhost:* wss://localhost:* https://links.services.disqus.com https://*.disqus.com;"><meta name=author content="Eric X. Liu"><meta name=description content="Eric X. Liu - Software & Performance Engineer at Google. Sharing insights about software engineering, performance optimization, tech industry experiences, mountain biking adventures, Jeep overlanding, and outdoor activities."><meta name=keywords content="software engineer,performance engineering,Google engineer,tech blog,software development,performance optimization,Eric Liu,engineering blog,mountain biking,Jeep enthusiast,overlanding,camping,outdoor adventures"><meta name=twitter:card content="summary"><meta name=twitter:title content="Eric X. Liu's Personal Page"><meta name=twitter:description content="Eric X. Liu - Software & Performance Engineer at Google. Sharing insights about software engineering, performance optimization, tech industry experiences, mountain biking adventures, Jeep overlanding, and outdoor activities."><meta property="og:url" content="https://ericxliu.me/"><meta property="og:site_name" content="Eric X. Liu's Personal Page"><meta property="og:title" content="Eric X. Liu's Personal Page"><meta property="og:description" content="Eric X. Liu - Software & Performance Engineer at Google. 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Liu's Personal Page</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=color-scheme content="light dark"><meta http-equiv=Content-Security-Policy content="upgrade-insecure-requests; block-all-mixed-content; default-src 'self'; child-src 'self'; font-src 'self' https://fonts.gstatic.com https://cdn.jsdelivr.net/; form-action 'self'; frame-src 'self' https://www.youtube.com https://disqus.com; img-src 'self' https://referrer.disqus.com https://c.disquscdn.com https://*.disqus.com; object-src 'none'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com/ https://cdn.jsdelivr.net/; script-src 'self' 'unsafe-inline' https://www.google-analytics.com https://cdn.jsdelivr.net/ https://pagead2.googlesyndication.com https://static.cloudflareinsights.com https://unpkg.com https://ericxliu-me.disqus.com https://disqus.com https://*.disqus.com https://*.disquscdn.com https://unpkg.com; connect-src 'self' https://www.google-analytics.com https://pagead2.googlesyndication.com https://cloudflareinsights.com ws://localhost:1313 ws://localhost:* wss://localhost:* https://links.services.disqus.com https://*.disqus.com;"><meta name=author content="Eric X. Liu"><meta name=description content="Eric X. Liu - Software & Performance Engineer at Google. Sharing insights about software engineering, performance optimization, tech industry experiences, mountain biking adventures, Jeep overlanding, and outdoor activities."><meta name=keywords content="software engineer,performance engineering,Google engineer,tech blog,software development,performance optimization,Eric Liu,engineering blog,mountain biking,Jeep enthusiast,overlanding,camping,outdoor adventures"><meta name=twitter:card content="summary"><meta name=twitter:title content="Eric X. Liu's Personal Page"><meta name=twitter:description content="Eric X. Liu - Software & Performance Engineer at Google. Sharing insights about software engineering, performance optimization, tech industry experiences, mountain biking adventures, Jeep overlanding, and outdoor activities."><meta property="og:url" content="https://ericxliu.me/"><meta property="og:site_name" content="Eric X. Liu's Personal Page"><meta property="og:title" content="Eric X. Liu's Personal Page"><meta property="og:description" content="Eric X. Liu - Software & Performance Engineer at Google. Sharing insights about software engineering, performance optimization, tech industry experiences, mountain biking adventures, Jeep overlanding, and outdoor activities."><meta property="og:locale" content="en"><meta property="og:type" content="website"><link rel=preload href=/fonts/fa-solid-900.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-brands-400.woff2 as=font type=font/woff2 crossorigin><link rel=canonical href=https://ericxliu.me/><link rel=preload href=/fonts/fa-brands-400.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-regular-400.woff2 as=font type=font/woff2 crossorigin><link rel=preload href=/fonts/fa-solid-900.woff2 as=font type=font/woff2 crossorigin><link rel=stylesheet href=/css/coder.min.4b392a85107b91dbdabc528edf014a6ab1a30cd44cafcd5325c8efe796794fca.css integrity="sha256-SzkqhRB7kdvavFKO3wFKarGjDNRMr81TJcjv55Z5T8o=" crossorigin=anonymous media=screen><link rel=stylesheet href=/css/coder-dark.min.a00e6364bacbc8266ad1cc81230774a1397198f8cfb7bcba29b7d6fcb54ce57f.css integrity="sha256-oA5jZLrLyCZq0cyBIwd0oTlxmPjPt7y6KbfW/LVM5X8=" crossorigin=anonymous media=screen><link rel=icon type=image/svg+xml href=/images/favicon.svg sizes=any><link rel=icon type=image/png href=/images/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/images/favicon-16x16.png sizes=16x16><link rel=apple-touch-icon href=/images/apple-touch-icon.png><link rel=apple-touch-icon sizes=180x180 href=/images/apple-touch-icon.png><link rel=manifest href=/site.webmanifest><link rel=mask-icon href=/images/safari-pinned-tab.svg color=#5bbad5><link rel=alternate type=application/rss+xml href=/index.xml title="Eric X. Liu's Personal Page"><meta name=generator content="Hugo 0.153.3"><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-3972604619956476" crossorigin=anonymous></script><script type=application/ld+json>{"@context":"http://schema.org","@type":"Person","name":"Eric X. Liu","url":"https:\/\/ericxliu.me\/","description":"Software \u0026 Performance Engineer at Google","sameAs":["https:\/\/www.linkedin.com\/in\/eric-x-liu-46648b93\/","https:\/\/git.ericxliu.me\/eric"]}</script></head><body class="preload-transitions colorscheme-auto"><div class=float-container><a id=dark-mode-toggle class=colorscheme-toggle><i class="fa-solid fa-adjust fa-fw" aria-hidden=true></i></a></div><main class=wrapper><nav class=navigation><section class=container><a class=navigation-title href=https://ericxliu.me/>Eric X. Liu's Personal Page
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<label class="menu-button float-right" for=menu-toggle><i class="fa-solid fa-bars fa-fw" aria-hidden=true></i></label><ul class=navigation-list><li class=navigation-item><a class=navigation-link href=/posts/>Posts</a></li><li class=navigation-item><a class=navigation-link href=https://chat.ericxliu.me>Chat</a></li><li class=navigation-item><a class=navigation-link href=https://git.ericxliu.me/user/oauth2/Authenitk>Git</a></li><li class=navigation-item><a class=navigation-link href=https://coder.ericxliu.me/api/v2/users/oidc/callback>Coder</a></li><li class=navigation-item><a class=navigation-link href=/about/>About</a></li><li class=navigation-item><a class=navigation-link href=/>|</a></li><li class=navigation-item><a class=navigation-link href=https://sso.ericxliu.me>Sign in</a></li></ul></section></nav><div class=content><section class="container centered"><div class=about><div class=avatar><img src=/images/gravatar.png alt=avatar width=200 height=200></div><h1>Eric X. Liu</h1><h2 id=typeit-info></h2><script src=https://unpkg.com/typeit@8.7.1/dist/index.umd.js></script><script>document.addEventListener("DOMContentLoaded",function(){new TypeIt("#typeit-info",{strings:["Software & Performance Engineer @Google","DIY Overlander & Rock Crawler","Tech Enthusiast"],speed:50,loop:!0,breakLines:!1,nextStringDelay:2e3,deleteSpeed:50,startDelay:500,lifeLike:!0}).go()})</script><ul><li><a href=https://git.ericxliu.me/eric aria-label=Git><i class="fa-brands fa-git fa-2x" aria-hidden=true></i></a></li><li><a href=https://www.linkedin.com/in/eric-x-liu-46648b93/ aria-label=linkedin><i class="fa-brands fa-linkedin fa-2x" aria-hidden=true></i></a></li><li><style>#span-b2b18f96.cloaked-e-mail{display:none}</style> <span class=cloaked-e-mail data-user=cire data-domain=em.uilxcire data-display="PGkgY2xhc3M9ImZhIGZhLWVudmVsb3BlIGZhLTJ4IiBhcmlhLWhpZGRlbj0idHJ1ZSI+PC9pPg==" id=span-b2b18f96></span> <label class="menu-button float-right" for=menu-toggle><i class="fa-solid fa-bars fa-fw" aria-hidden=true></i></label><ul class=navigation-list><li class=navigation-item><a class=navigation-link href=/posts/>Posts</a></li><li class=navigation-item><a class=navigation-link href=https://chat.ericxliu.me>Chat</a></li><li class=navigation-item><a class=navigation-link href=https://git.ericxliu.me/user/oauth2/Authenitk>Git</a></li><li class=navigation-item><a class=navigation-link href=https://coder.ericxliu.me/api/v2/users/oidc/callback>Coder</a></li><li class=navigation-item><a class=navigation-link href=/about/>About</a></li><li class=navigation-item><a class=navigation-link href=/>|</a></li><li class=navigation-item><a class=navigation-link href=https://sso.ericxliu.me>Sign in</a></li></ul></section></nav><div class=content><section class="container centered"><div class=about><div class=avatar><img src=/images/gravatar.png alt=avatar width=200 height=200></div><h1>Eric X. Liu</h1><h2 id=typeit-info></h2><script src=https://unpkg.com/typeit@8.7.1/dist/index.umd.js></script><script>document.addEventListener("DOMContentLoaded",function(){new TypeIt("#typeit-info",{strings:["Software & Performance Engineer @Google","DIY Overlander & Rock Crawler","Tech Enthusiast"],speed:50,loop:!0,breakLines:!1,nextStringDelay:2e3,deleteSpeed:50,startDelay:500,lifeLike:!0}).go()})</script><ul><li><a href=https://git.ericxliu.me/eric aria-label=Git><i class="fa-brands fa-git fa-2x" aria-hidden=true></i></a></li><li><a href=https://www.linkedin.com/in/eric-x-liu-46648b93/ aria-label=linkedin><i class="fa-brands fa-linkedin fa-2x" aria-hidden=true></i></a></li><li><style>#span-40d25b76.cloaked-e-mail{display:none}</style> <span class=cloaked-e-mail data-user=cire data-domain=em.uilxcire data-display="PGkgY2xhc3M9ImZhIGZhLWVudmVsb3BlIGZhLTJ4IiBhcmlhLWhpZGRlbj0idHJ1ZSI+PC9pPg==" id=span-40d25b76></span>
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2016 - 2016 -
2025 2025
Eric X. Liu Eric X. Liu
<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/30f639d">[30f639d]</a></section></footer></main><script src=/js/coder.min.6ae284be93d2d19dad1f02b0039508d9aab3180a12a06dcc71b0b0ef7825a317.js integrity="sha256-auKEvpPS0Z2tHwKwA5UI2aqzGAoSoG3McbCw73gloxc="></script><script defer src=https://static.cloudflareinsights.com/beacon.min.js data-cf-beacon='{"token": "987638e636ce4dbb932d038af74c17d1"}'></script></body></html> <a href="https://git.ericxliu.me/eric/ericxliu-me/commit/13a094e">[13a094e]</a></section></footer></main><script src=/js/coder.min.6ae284be93d2d19dad1f02b0039508d9aab3180a12a06dcc71b0b0ef7825a317.js integrity="sha256-auKEvpPS0Z2tHwKwA5UI2aqzGAoSoG3McbCw73gloxc="></script><script defer src=https://static.cloudflareinsights.com/beacon.min.js data-cf-beacon='{"token": "987638e636ce4dbb932d038af74c17d1"}'></script></body></html>

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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Eric X. Liu's Personal Page</title><link>https://ericxliu.me/</link><description>Recent content on Eric X. Liu's Personal Page</description><generator>Hugo</generator><language>en</language><lastBuildDate>Sat, 27 Dec 2025 22:05:12 +0000</lastBuildDate><atom:link href="https://ericxliu.me/index.xml" rel="self" type="application/rss+xml"/><item><title>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</title><link>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</link><pubDate>Sat, 27 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</guid><description>&lt;p&gt;Running a family finance system is surprisingly complex. What starts as a simple spreadsheet often evolves into a web of rules, exceptions, and &amp;ldquo;wait, was this dinner or &lt;em&gt;vacation&lt;/em&gt; dinner?&amp;rdquo; questions.&lt;/p&gt; <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Eric X. Liu's Personal Page</title><link>https://ericxliu.me/</link><description>Recent content on Eric X. Liu's Personal Page</description><generator>Hugo</generator><language>en</language><lastBuildDate>Sun, 28 Dec 2025 20:42:03 +0000</lastBuildDate><atom:link href="https://ericxliu.me/index.xml" rel="self" type="application/rss+xml"/><item><title>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</title><link>https://ericxliu.me/posts/jellyfin-sso-with-authentik/</link><pubDate>Sun, 28 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/jellyfin-sso-with-authentik/</guid><description>&lt;p&gt;I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren&amp;rsquo;t immediately obvious.&lt;/p&gt;
&lt;h2 id="the-setup"&gt;
The Setup
&lt;a class="heading-link" href="#the-setup"&gt;
&lt;i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"&gt;&lt;/i&gt;
&lt;span class="sr-only"&gt;Link to heading&lt;/span&gt;
&lt;/a&gt;
&lt;/h2&gt;
&lt;p&gt;The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent.&lt;/p&gt;</description></item><item><title>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</title><link>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</link><pubDate>Sat, 27 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</guid><description>&lt;p&gt;Running a family finance system is surprisingly complex. What starts as a simple spreadsheet often evolves into a web of rules, exceptions, and &amp;ldquo;wait, was this dinner or &lt;em&gt;vacation&lt;/em&gt; dinner?&amp;rdquo; questions.&lt;/p&gt;
&lt;p&gt;For years, I relied on a rule-based system to categorize our credit card transactions. It worked&amp;hellip; mostly. But maintaining &lt;code&gt;if &amp;quot;UBER&amp;quot; in description and amount &amp;gt; 50&lt;/code&gt; style rules is a never-ending battle against the entropy of merchant names and changing habits.&lt;/p&gt;</description></item><item><title>About</title><link>https://ericxliu.me/about/</link><pubDate>Fri, 19 Dec 2025 22:46:12 -0800</pubDate><guid>https://ericxliu.me/about/</guid><description>&lt;img src="https://ericxliu.me/images/about.jpeg" alt="Eric Liu" width="300" style="float: left; margin-right: 1.5rem; margin-bottom: 1rem; border-radius: 8px;"/&gt; &lt;p&gt;For years, I relied on a rule-based system to categorize our credit card transactions. It worked&amp;hellip; mostly. But maintaining &lt;code&gt;if &amp;quot;UBER&amp;quot; in description and amount &amp;gt; 50&lt;/code&gt; style rules is a never-ending battle against the entropy of merchant names and changing habits.&lt;/p&gt;</description></item><item><title>About</title><link>https://ericxliu.me/about/</link><pubDate>Fri, 19 Dec 2025 22:46:12 -0800</pubDate><guid>https://ericxliu.me/about/</guid><description>&lt;img src="https://ericxliu.me/images/about.jpeg" alt="Eric Liu" width="300" style="float: left; margin-right: 1.5rem; margin-bottom: 1rem; border-radius: 8px;"/&gt;
&lt;p&gt;Hi, I&amp;rsquo;m &lt;strong&gt;Eric Liu&lt;/strong&gt;.&lt;/p&gt; &lt;p&gt;Hi, I&amp;rsquo;m &lt;strong&gt;Eric Liu&lt;/strong&gt;.&lt;/p&gt;
&lt;p&gt;I am a &lt;strong&gt;Staff Software Engineer and Tech Lead Manager (TLM)&lt;/strong&gt; at &lt;strong&gt;Google&lt;/strong&gt;, based in Sunnyvale, CA.&lt;/p&gt; &lt;p&gt;I am a &lt;strong&gt;Staff Software Engineer and Tech Lead Manager (TLM)&lt;/strong&gt; at &lt;strong&gt;Google&lt;/strong&gt;, based in Sunnyvale, CA.&lt;/p&gt;

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<a class=title href=/posts/jellyfin-sso-with-authentik/>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</a></li><li><span class=date>December 27, 2025</span>
<a class=title href=/posts/technical-deep-dive-llm-categorization/>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</a></li><li><span class=date>December 19, 2025</span> <a class=title href=/posts/technical-deep-dive-llm-categorization/>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</a></li><li><span class=date>December 19, 2025</span>
<a class=title href=/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/>The Convergence of Fast Weights, Linear Attention, and State Space Models</a></li><li><span class=date>December 8, 2025</span> <a class=title href=/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/>The Convergence of Fast Weights, Linear Attention, and State Space Models</a></li><li><span class=date>December 8, 2025</span>
<a class=title href=/posts/vattention/>vAttention</a></li><li><span class=date>October 4, 2025</span> <a class=title href=/posts/vattention/>vAttention</a></li><li><span class=date>October 4, 2025</span>
@@ -9,9 +10,8 @@
<a class=title href=/posts/openwrt-mwan3-wireguard-endpoint-exclusion/>OpenWrt: Fix WireGuard Connectivity with MWAN3 by Excluding the VPN Endpoint</a></li><li><span class=date>September 22, 2025</span> <a class=title href=/posts/openwrt-mwan3-wireguard-endpoint-exclusion/>OpenWrt: Fix WireGuard Connectivity with MWAN3 by Excluding the VPN Endpoint</a></li><li><span class=date>September 22, 2025</span>
<a class=title href=/posts/unifi-vlan-migration-to-zone-based-architecture/>UniFi VLAN Migration to Zone-Based Architecture</a></li><li><span class=date>August 19, 2025</span> <a class=title href=/posts/unifi-vlan-migration-to-zone-based-architecture/>UniFi VLAN Migration to Zone-Based Architecture</a></li><li><span class=date>August 19, 2025</span>
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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on Eric X. Liu's Personal Page</title><link>https://ericxliu.me/posts/</link><description>Recent content in Posts on Eric X. Liu's Personal Page</description><generator>Hugo</generator><language>en</language><lastBuildDate>Sat, 27 Dec 2025 22:05:12 +0000</lastBuildDate><atom:link href="https://ericxliu.me/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</title><link>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</link><pubDate>Sat, 27 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</guid><description>&lt;p&gt;Running a family finance system is surprisingly complex. What starts as a simple spreadsheet often evolves into a web of rules, exceptions, and &amp;ldquo;wait, was this dinner or &lt;em&gt;vacation&lt;/em&gt; dinner?&amp;rdquo; questions.&lt;/p&gt; <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on Eric X. Liu's Personal Page</title><link>https://ericxliu.me/posts/</link><description>Recent content in Posts on Eric X. Liu's Personal Page</description><generator>Hugo</generator><language>en</language><lastBuildDate>Sun, 28 Dec 2025 20:42:03 +0000</lastBuildDate><atom:link href="https://ericxliu.me/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</title><link>https://ericxliu.me/posts/jellyfin-sso-with-authentik/</link><pubDate>Sun, 28 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/jellyfin-sso-with-authentik/</guid><description>&lt;p&gt;I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren&amp;rsquo;t immediately obvious.&lt;/p&gt;
&lt;h2 id="the-setup"&gt;
The Setup
&lt;a class="heading-link" href="#the-setup"&gt;
&lt;i class="fa-solid fa-link" aria-hidden="true" title="Link to heading"&gt;&lt;/i&gt;
&lt;span class="sr-only"&gt;Link to heading&lt;/span&gt;
&lt;/a&gt;
&lt;/h2&gt;
&lt;p&gt;The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent.&lt;/p&gt;</description></item><item><title>From Gemini-3-Flash to T5-Gemma-2 A Journey in Distilling a Family Finance LLM</title><link>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</link><pubDate>Sat, 27 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/technical-deep-dive-llm-categorization/</guid><description>&lt;p&gt;Running a family finance system is surprisingly complex. What starts as a simple spreadsheet often evolves into a web of rules, exceptions, and &amp;ldquo;wait, was this dinner or &lt;em&gt;vacation&lt;/em&gt; dinner?&amp;rdquo; questions.&lt;/p&gt;
&lt;p&gt;For years, I relied on a rule-based system to categorize our credit card transactions. It worked&amp;hellip; mostly. But maintaining &lt;code&gt;if &amp;quot;UBER&amp;quot; in description and amount &amp;gt; 50&lt;/code&gt; style rules is a never-ending battle against the entropy of merchant names and changing habits.&lt;/p&gt;</description></item><item><title>The Convergence of Fast Weights, Linear Attention, and State Space Models</title><link>https://ericxliu.me/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/</link><pubDate>Fri, 19 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/</guid><description>&lt;p&gt;Modern Large Language Models (LLMs) are dominated by the Transformer architecture. However, as context windows grow, the computational cost of the Transformer’s attention mechanism has become a primary bottleneck. Recent discussions in the AI community—most notably by Geoffrey Hinton—have highlighted a theoretical link between biological memory mechanisms (&amp;ldquo;Fast Weights&amp;rdquo;) and efficient engineering solutions like Linear Transformers and State Space Models (SSMs).&lt;/p&gt; &lt;p&gt;For years, I relied on a rule-based system to categorize our credit card transactions. It worked&amp;hellip; mostly. But maintaining &lt;code&gt;if &amp;quot;UBER&amp;quot; in description and amount &amp;gt; 50&lt;/code&gt; style rules is a never-ending battle against the entropy of merchant names and changing habits.&lt;/p&gt;</description></item><item><title>The Convergence of Fast Weights, Linear Attention, and State Space Models</title><link>https://ericxliu.me/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/</link><pubDate>Fri, 19 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/the-convergence-of-fast-weights-linear-attention-and-state-space-models/</guid><description>&lt;p&gt;Modern Large Language Models (LLMs) are dominated by the Transformer architecture. However, as context windows grow, the computational cost of the Transformer’s attention mechanism has become a primary bottleneck. Recent discussions in the AI community—most notably by Geoffrey Hinton—have highlighted a theoretical link between biological memory mechanisms (&amp;ldquo;Fast Weights&amp;rdquo;) and efficient engineering solutions like Linear Transformers and State Space Models (SSMs).&lt;/p&gt;
&lt;p&gt;This article explores the mathematical equivalence between Hinton’s concept of Fast Weights as Associative Memory and the recurrence mechanisms found in models such as Mamba and RWKV.&lt;/p&gt;</description></item><item><title>vAttention</title><link>https://ericxliu.me/posts/vattention/</link><pubDate>Mon, 08 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/vattention/</guid><description>&lt;p&gt;Large Language Model (LLM) inference is memory-bound, primarily due to the Key-Value (KV) cache—a store of intermediate state that grows linearly with sequence length. Efficient management of this memory is critical for throughput. While &lt;strong&gt;PagedAttention&lt;/strong&gt; (popularized by vLLM) became the industry standard by solving memory fragmentation via software, recent research suggests that leveraging the GPU’s native hardware Memory Management Unit (MMU) offers a more performant and portable solution.&lt;/p&gt; &lt;p&gt;This article explores the mathematical equivalence between Hinton’s concept of Fast Weights as Associative Memory and the recurrence mechanisms found in models such as Mamba and RWKV.&lt;/p&gt;</description></item><item><title>vAttention</title><link>https://ericxliu.me/posts/vattention/</link><pubDate>Mon, 08 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/vattention/</guid><description>&lt;p&gt;Large Language Model (LLM) inference is memory-bound, primarily due to the Key-Value (KV) cache—a store of intermediate state that grows linearly with sequence length. Efficient management of this memory is critical for throughput. While &lt;strong&gt;PagedAttention&lt;/strong&gt; (popularized by vLLM) became the industry standard by solving memory fragmentation via software, recent research suggests that leveraging the GPU’s native hardware Memory Management Unit (MMU) offers a more performant and portable solution.&lt;/p&gt;
&lt;h4 id="the-status-quo-pagedattention-and-software-tables"&gt; &lt;h4 id="the-status-quo-pagedattention-and-software-tables"&gt;

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The Setup
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<label class="menu-button float-right" for=menu-toggle><i class="fa-solid fa-bars fa-fw" aria-hidden=true></i></label><ul class=navigation-list><li class=navigation-item><a class=navigation-link href=/posts/>Posts</a></li><li class=navigation-item><a class=navigation-link href=https://chat.ericxliu.me>Chat</a></li><li class=navigation-item><a class=navigation-link href=https://git.ericxliu.me/user/oauth2/Authenitk>Git</a></li><li class=navigation-item><a class=navigation-link href=https://coder.ericxliu.me/api/v2/users/oidc/callback>Coder</a></li><li class=navigation-item><a class=navigation-link href=/about/>About</a></li><li class=navigation-item><a class=navigation-link href=/>|</a></li><li class=navigation-item><a class=navigation-link href=https://sso.ericxliu.me>Sign in</a></li></ul></section></nav><div class=content><section class="container post"><article><header><div class=post-title><h1 class=title><a class=title-link href=https://ericxliu.me/posts/jellyfin-sso-with-authentik/>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</a></h1></div><div class=post-meta><div class=date><span class=posted-on><i class="fa-solid fa-calendar" aria-hidden=true></i>
<time datetime=2025-12-28T00:00:00Z>December 28, 2025
</time></span><span class=reading-time><i class="fa-solid fa-clock" aria-hidden=true></i>
3-minute read</span></div></div></header><div class=post-content><p>I recently integrated Jellyfin with Authentik for Single Sign-On (SSO). While the plugin works, it is still very much in an early development phase. The logging is often sparse or cryptic, and the feedback loop can be frustrating. Here is a guide focused on the obscure errors you might encounter and the simple fixes that aren&rsquo;t immediately obvious.</p><h2 id=the-setup>The Setup
<a class=heading-link href=#the-setup><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h2><p>The configuration is best handled via API (curl) rather than the UI, as it ensures all fields are correctly typed and persistent.</p><h3 id=1-authentik-terraform>1. Authentik (Terraform)
<a class=heading-link href=#1-authentik-terraform><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><p>Let Authentik manage the secrets. Don&rsquo;t hardcode them.</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-hcl data-lang=hcl><span style=display:flex><span><span style=color:#ff7b72>resource</span> <span style=color:#a5d6ff>&#34;authentik_provider_oauth2&#34; &#34;jellyfin&#34;</span> {
</span></span><span style=display:flex><span> name <span style=color:#ff7b72;font-weight:700>=</span> <span style=color:#a5d6ff>&#34;Jellyfin&#34;</span>
</span></span><span style=display:flex><span> client_id <span style=color:#ff7b72;font-weight:700>=</span> <span style=color:#a5d6ff>&#34;jellyfin-ericxliu-me&#34;</span><span style=color:#8b949e;font-style:italic>
</span></span></span><span style=display:flex><span><span style=color:#8b949e;font-style:italic> # client_secret omitted -&gt; auto-generated
</span></span></span><span style=display:flex><span> property_mappings <span style=color:#ff7b72;font-weight:700>=</span> [
</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>openid</span>.<span style=color:#ff7b72>id</span>,
</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>profile</span>.<span style=color:#ff7b72>id</span>,
</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>email</span>.<span style=color:#ff7b72>id</span>,
</span></span><span style=display:flex><span> <span style=color:#ff7b72>authentik_scope_mapping</span>.<span style=color:#ff7b72>groups</span>.<span style=color:#ff7b72>id</span>
</span></span><span style=display:flex><span> ]<span style=color:#8b949e;font-style:italic>
</span></span></span><span style=display:flex><span><span style=color:#8b949e;font-style:italic> # ...
</span></span></span><span style=display:flex><span>}
</span></span></code></pre></div><h3 id=2-jellyfin-plugin-bashcurl>2. Jellyfin Plugin (Bash/Curl)
<a class=heading-link href=#2-jellyfin-plugin-bashcurl><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-bash data-lang=bash><span style=display:flex><span><span style=color:#8b949e;font-style:italic># ... (retrieve secret from terraform) ...</span>
</span></span><span style=display:flex><span>curl -X POST <span style=color:#a5d6ff>&#34;https://jellyfin.ericxliu.me/SSO/OID/Add/authentik&#34;</span> ... -d <span style=color:#a5d6ff>&#39;{
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> &#34;OidClientId&#34;: &#34;jellyfin-ericxliu-me&#34;,
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> &#34;OidSecret&#34;: &#34;&#39;</span><span style=color:#a5d6ff>&#34;</span><span style=color:#a5d6ff>${</span><span style=color:#79c0ff>SECRET</span><span style=color:#a5d6ff>}</span><span style=color:#a5d6ff>&#34;</span><span style=color:#a5d6ff>&#39;&#34;,
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> &#34;OidScopes&#34;: [&#34;openid&#34;, &#34;profile&#34;, &#34;email&#34;, &#34;groups&#34;],
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> &#34;SchemeOverride&#34;: &#34;https&#34;,
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> &#34;RoleClaim&#34;: &#34;groups&#34;
</span></span></span><span style=display:flex><span><span style=color:#a5d6ff> }&#39;</span>
</span></span></code></pre></div><h2 id=obscure-errors--fixes>Obscure Errors & Fixes
<a class=heading-link href=#obscure-errors--fixes><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h2><p>Because the plugin is still maturing, it doesn&rsquo;t always handle configuration errors gracefully. Here are the two main &ldquo;cryptic&rdquo; failures I encountered.</p><h3 id=1-the-value-cannot-be-null-crash>1. The &ldquo;Value cannot be null&rdquo; Crash
<a class=heading-link href=#1-the-value-cannot-be-null-crash><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>:
You attempt to start the SSO flow and get a generic 500 error. The Jellyfin logs show a C# exception:</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-fallback data-lang=fallback><span style=display:flex><span>System.ArgumentNullException: Value cannot be null. (Parameter &#39;source&#39;)
</span></span><span style=display:flex><span> at System.Linq.Enumerable.Prepend[TSource](IEnumerable`1 source, TSource element)
</span></span><span style=display:flex><span> at Jellyfin.Plugin.SSO.Api.SSOController.OidChallenge(...)
</span></span></code></pre></div><p><strong>The Reality</strong>:
This looks like deep internal failure, but it&rsquo;s actually a simple configuration miss. The plugin code attempts to prepend &ldquo;openid profile&rdquo; to your configured scopes without checking if your scopes array exists first.
<strong>The Fix</strong>:
You <strong>must</strong> explicitly provide <code>"OidScopes"</code> in your JSON configuration. It cannot be null or omitted.</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-json data-lang=json><span style=display:flex><span><span style=color:#a5d6ff>&#34;OidScopes&#34;</span><span style=color:#f85149>:</span> [<span style=color:#a5d6ff>&#34;openid&#34;</span>, <span style=color:#a5d6ff>&#34;profile&#34;</span>, <span style=color:#a5d6ff>&#34;email&#34;</span>, <span style=color:#a5d6ff>&#34;groups&#34;</span>]
</span></span></code></pre></div><h3 id=2-the-httphttps-mismatch-redirect-loop>2. The HTTP/HTTPS Mismatch (Redirect Loop)
<a class=heading-link href=#2-the-httphttps-mismatch-redirect-loop><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>:
Authentik rejects the authorization request with &ldquo;Redirect URI mismatch&rdquo;, or the browser enters a redirect loop.
<strong>The Reality</strong>:
Jellyfin often sits behind a reverse proxy (Ingress/Traefik) terminating TLS. Use <code>Browser Developer Tools</code> to inspect the network requests. You will likely see the <code>redirect_uri</code> parameter encoded as <code>http://jellyfin...</code> instead of <code>https://</code>. configuration.
<strong>The Fix</strong>:
Do not rely on header forwarding magic. Force the scheme in the plugin configuration:</p><div class=highlight><pre tabindex=0 style=color:#e6edf3;background-color:#0d1117;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-json data-lang=json><span style=display:flex><span><span style=color:#a5d6ff>&#34;SchemeOverride&#34;</span><span style=color:#f85149>:</span> <span style=color:#a5d6ff>&#34;https&#34;</span>
</span></span></code></pre></div><h3 id=3-case-sensitivity-in-json>3. Case Sensitivity in JSON
<a class=heading-link href=#3-case-sensitivity-in-json><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><p><strong>The Symptom</strong>: Configuration seems to be ignored or fields remain empty after a POST.
<strong>The Reality</strong>: The plugin&rsquo;s API controller keys are Case Sensitive in some versions/contexts.
<strong>The Fix</strong>: Stick to PascalCase for the keys (<code>OidEndpoint</code>, <code>AdminRoles</code>) as seen in the C# DTOs, rather than camelCase (<code>oidEndpoint</code>), unless the specific version documentation explicitly states otherwise. When in doubt, checking the source code (<code>SSOController.cs</code>) is often faster than trusting the README.</p><h2 id=summary>Summary
<a class=heading-link href=#summary><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h2><p>When debugging Jellyfin SSO, don&rsquo;t trust the UI to tell you what&rsquo;s wrong.</p><ol><li><strong>Check the logs</strong> (<code>kubectl logs</code>) for C# stack traces.</li><li><strong>Sanitize your JSON</strong> inputs (arrays can&rsquo;t be null).</li><li><strong>Inspect the URL parameters</strong> in your browser to see what Redirect URI is actually being generated.</li></ol><h3 id=references>References
<a class=heading-link href=#references><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h3><ul><li>Jellyfin SSO Plugin Repository: <code>https://github.com/9p4/jellyfin-plugin-sso</code></li><li>Authentik Documentation: <code>https://goauthentik.io/docs/providers/oauth2/</code></li><li>Jellyfin API Documentation: <code>https://api.jellyfin.org/</code></li></ul></div><footer><div id=disqus_thread></div><script>window.disqus_config=function(){},function(){if(["localhost","127.0.0.1"].indexOf(window.location.hostname)!=-1){document.getElementById("disqus_thread").innerHTML="Disqus comments not available by default when the website is previewed locally.";return}var t=document,e=t.createElement("script");e.async=!0,e.src="//ericxliu-me.disqus.com/embed.js",e.setAttribute("data-timestamp",+new Date),(t.head||t.body).appendChild(e)}(),document.addEventListener("themeChanged",function(){document.readyState=="complete"&&DISQUS.reset({reload:!0,config:disqus_config})})</script></footer></article><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.css integrity=sha384-vKruj+a13U8yHIkAyGgK1J3ArTLzrFGBbBc0tDp4ad/EyewESeXE/Iv67Aj8gKZ0 crossorigin=anonymous><script defer src=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.js integrity=sha384-PwRUT/YqbnEjkZO0zZxNqcxACrXe+j766U2amXcgMg5457rve2Y7I6ZJSm2A0mS4 crossorigin=anonymous></script><script defer src=https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/contrib/auto-render.min.js integrity=sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05 crossorigin=anonymous onload='renderMathInElement(document.body,{delimiters:[{left:"$$",right:"$$",display:!0},{left:"$",right:"$",display:!1},{left:"\\(",right:"\\)",display:!1},{left:"\\[",right:"\\]",display:!0}]})'></script></section></div><footer class=footer><section class=container>©
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<a class=title href=/posts/secure-boot-dkms-and-mok-on-proxmox-debian/>Fixing GPU Operator Pods Stuck in Init: Secure Boot, DKMS, and MOK on Proxmox + Debian</a></li><li><span class=date>August 7, 2025</span>
<a class=title href=/posts/how-rvq-teaches-llms-to-see-and-hear/>Beyond Words: How RVQ Teaches LLMs to See and Hear</a></li><li><span class=date>August 3, 2025</span> <a class=title href=/posts/how-rvq-teaches-llms-to-see-and-hear/>Beyond Words: How RVQ Teaches LLMs to See and Hear</a></li><li><span class=date>August 3, 2025</span>
<a class=title href=/posts/supabase-deep-dive/>Supabase Deep Dive: It's Not Magic, It's Just Postgres</a></li><li><span class=date>August 2, 2025</span> <a class=title href=/posts/supabase-deep-dive/>Supabase Deep Dive: It's Not Magic, It's Just Postgres</a></li><li><span class=date>August 2, 2025</span>
<a class=title href=/posts/ppo-for-language-models/>A Deep Dive into PPO for Language Models</a></li><li><span class=date>July 2, 2025</span> <a class=title href=/posts/ppo-for-language-models/>A Deep Dive into PPO for Language Models</a></li><li><span class=date>July 2, 2025</span>
@@ -12,4 +13,4 @@
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