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2026-01-08 06:03:04 +00:00
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2016 -
2026
Eric X. Liu
<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/89dc118">[89dc118]</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 -
2026
Eric X. Liu
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2016 -
2026
Eric X. Liu
<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/89dc118">[89dc118]</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 -
2026
Eric X. Liu
<a href="https://git.ericxliu.me/eric/ericxliu-me/commit/89dc118">[89dc118]</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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<!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. 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 0.154.2"><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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2016 -
2026
Eric X. Liu
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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, 03 Jan 2026 06:23:35 +0000</lastBuildDate><atom:link href="https://ericxliu.me/index.xml" rel="self" type="application/rss+xml"/><item><title>Why Your "Resilient" Homelab is Slower Than a Raspberry Pi</title><link>https://ericxliu.me/posts/debugging-authentik-performance/</link><pubDate>Fri, 02 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/debugging-authentik-performance/</guid><description>&lt;p&gt;In the world of self-hosting, there are many metrics for success: 99.9% uptime, sub-second latency, or a perfect GitOps pipeline. But for those of us running &amp;ldquo;production&amp;rdquo; at home, there is only one metric that truly matters: &lt;strong&gt;The Wife Acceptance Factor (WAF)&lt;/strong&gt;.&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>Thu, 08 Jan 2026 06:02:38 +0000</lastBuildDate><atom:link href="https://ericxliu.me/index.xml" rel="self" type="application/rss+xml"/><item><title>Why I Downgraded Magisk to Root My Pixel 2 XL</title><link>https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/</link><pubDate>Wed, 07 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/</guid><description>&lt;p&gt;For the past few weeks, I&amp;rsquo;ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn&amp;rsquo;t proof.&lt;/p&gt;
&lt;p&gt;Static analysis has its limits. I found the &amp;ldquo;smoking gun&amp;rdquo; function—a native method responsible for encrypting the login payload—but understanding &lt;em&gt;how&lt;/em&gt; it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache.&lt;/p&gt;</description></item><item><title>Why Your "Resilient" Homelab is Slower Than a Raspberry Pi</title><link>https://ericxliu.me/posts/debugging-authentik-performance/</link><pubDate>Fri, 02 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/debugging-authentik-performance/</guid><description>&lt;p&gt;In the world of self-hosting, there are many metrics for success: 99.9% uptime, sub-second latency, or a perfect GitOps pipeline. But for those of us running &amp;ldquo;production&amp;rdquo; at home, there is only one metric that truly matters: &lt;strong&gt;The Wife Acceptance Factor (WAF)&lt;/strong&gt;.&lt;/p&gt;
&lt;p&gt;My detailed Grafana dashboards said everything was fine. But my wife said the SSO login was &amp;ldquo;slow sometimes.&amp;rdquo; She was right. Debugging it took me down a rabbit hole of connection pooling, misplaced assumptions, and the harsh reality of running databases on distributed storage.&lt;/p&gt;</description></item><item><title>How I Got Open WebUI Talking to OpenAI Web Search</title><link>https://ericxliu.me/posts/open-webui-openai-websearch/</link><pubDate>Mon, 29 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/open-webui-openai-websearch/</guid><description>&lt;p&gt;OpenAI promised native web search in GPT‑5, but LiteLLM proxy deployments (and by extension Open WebUI) still choke on it—issue &lt;a href="https://github.com/BerriAI/litellm/issues/13042" class="external-link" target="_blank" rel="noopener"&gt;#13042&lt;/a&gt; tracks the fallout. I needed grounded answers inside Open WebUI anyway, so I built a workaround: route GPT‑5 traffic through the Responses API and mask every &lt;code&gt;web_search_call&lt;/code&gt; before the UI ever sees it.&lt;/p&gt;
&lt;p&gt;This post documents the final setup, the hotfix script that keeps LiteLLM honest, and the tests that prove Open WebUI now streams cited answers without trying to execute the tool itself.&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;This post documents the final setup, the hotfix script that keeps LiteLLM honest, and the tests that prove Open WebUI now streams cited answers without trying to execute the tool itself.&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;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;

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<time datetime=2026-01-02T00:00:00Z>January 2, 2026
@@ -36,7 +36,7 @@ My detailed Grafana dashboards said everything was fine. But my wife said the SS
</span></span></span><span style=display:flex><span><span style=color:#6e7681> </span><span style=color:#7ee787>synchronous_commit</span>:<span style=color:#6e7681> </span><span style=color:#a5d6ff>&#34;off&#34;</span><span style=color:#6e7681> </span><span style=color:#8b949e;font-style:italic># The magic switch</span><span style=color:#6e7681>
</span></span></span></code></pre></div><p><strong>What this does</strong>: Postgres returns &ldquo;Success&rdquo; to the application as soon as the transaction is in memory. It flushes to disk in the background. In the event of a crash, I might lose the last ~500ms of data (mostly cache entries), which is an acceptable trade-off.</p><h2 id=verification>Verification
<a class=heading-link href=#verification><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>I re-ran the benchmark with <code>synchronous_commit = off</code>.</p><table><thead><tr><th>Metric</th><th>Before (<code>sync=on</code>)</th><th>After (<code>sync=off</code>)</th><th>Improvement</th></tr></thead><tbody><tr><td>Sequential (Avg)</td><td>~4.8s</td><td><strong>0.40s</strong></td><td><strong>12x Faster</strong></td></tr><tr><td>Parallel (Wall)</td><td>~10.5s</td><td><strong>2.45s</strong></td><td><strong>4x Faster</strong></td></tr></tbody></table><p>The latency vanished. The login became instant.</p><h2 id=key-insights>Key Insights
<span class=sr-only>Link to heading</span></a></h2><p>I re-ran the benchmark with <code>synchronous_commit = off</code>.</p><table><thead><tr><th>Metric</th><th>Before (<code>sync=on</code>)</th><th>After (<code>sync=off</code>)</th><th>Improvement</th></tr></thead><tbody><tr><td>Sequential x8 stream (Avg)</td><td>~4.8s</td><td><strong>0.40s</strong></td><td><strong>12x Faster</strong></td></tr><tr><td>Parallel x8 stream (Wall)</td><td>~10.5s</td><td><strong>2.45s</strong></td><td><strong>4x Faster</strong></td></tr></tbody></table><p>The latency vanished. The login became instant.</p><h2 id=key-insights>Key Insights
<a class=heading-link href=#key-insights><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h2><ul><li><strong>Read Release Notes</strong>: The shift from Redis to Postgres for caching was a major architectural change that I missed during the upgrade.</li><li><strong>Storage Matters</strong>: Distributed storage (Ceph/Longhorn) handles linear writes well, but struggles with latency-sensitive, high-frequency sync operations like WAL updates.</li><li><strong>Tuning Postgres</strong>: For workloads where immediate durability is less critical than latency (like caching tables), <code>synchronous_commit = off</code> is a powerful tool.</li><li><strong>Observability</strong>: The &ldquo;Wife Test&rdquo; is a valid monitoring alert. If a user complains it&rsquo;s slow, investigate the P99 latency, not just the average.</li></ul><h3 id=references>References
<a class=heading-link href=#references><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
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<a class=title href=/posts/rooting-pixel-2-xl-for-reverse-engineering/>Why I Downgraded Magisk to Root My Pixel 2 XL</a></li><li><span class=date>January 2, 2026</span>
<a class=title href=/posts/debugging-authentik-performance/>Why Your "Resilient" Homelab is Slower Than a Raspberry Pi</a></li><li><span class=date>December 29, 2025</span>
<a class=title href=/posts/open-webui-openai-websearch/>How I Got Open WebUI Talking to OpenAI Web Search</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/vattention/>vAttention</a></li><li><span class=date>November 15, 2025</span>
<a class=title href=/posts/jellyfin-sso-with-authentik/>Setting Up Jellyfin SSO with Authentik: Surviving the Beta</a></li><li><span class=date>October 4, 2025</span>
<a class=title href=/posts/benchmarking-llms-on-jetson-orin-nano/>Why Your Jetson Orin Nano's 40 TOPS Goes Unused (And What That Means for Edge AI)</a></li><li><span class=date>October 2, 2025</span>
<a class=title href=/posts/flashing-jetson-orin-nano-in-virtualized-environments/>Flashing Jetson Orin Nano in Virtualized Environments</a></li><li><span class=date>September 28, 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>
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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, 03 Jan 2026 06:23:35 +0000</lastBuildDate><atom:link href="https://ericxliu.me/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Why Your "Resilient" Homelab is Slower Than a Raspberry Pi</title><link>https://ericxliu.me/posts/debugging-authentik-performance/</link><pubDate>Fri, 02 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/debugging-authentik-performance/</guid><description>&lt;p&gt;In the world of self-hosting, there are many metrics for success: 99.9% uptime, sub-second latency, or a perfect GitOps pipeline. But for those of us running &amp;ldquo;production&amp;rdquo; at home, there is only one metric that truly matters: &lt;strong&gt;The Wife Acceptance Factor (WAF)&lt;/strong&gt;.&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>Thu, 08 Jan 2026 06:02:38 +0000</lastBuildDate><atom:link href="https://ericxliu.me/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Why I Downgraded Magisk to Root My Pixel 2 XL</title><link>https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/</link><pubDate>Wed, 07 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/</guid><description>&lt;p&gt;For the past few weeks, I&amp;rsquo;ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn&amp;rsquo;t proof.&lt;/p&gt;
&lt;p&gt;Static analysis has its limits. I found the &amp;ldquo;smoking gun&amp;rdquo; function—a native method responsible for encrypting the login payload—but understanding &lt;em&gt;how&lt;/em&gt; it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache.&lt;/p&gt;</description></item><item><title>Why Your "Resilient" Homelab is Slower Than a Raspberry Pi</title><link>https://ericxliu.me/posts/debugging-authentik-performance/</link><pubDate>Fri, 02 Jan 2026 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/debugging-authentik-performance/</guid><description>&lt;p&gt;In the world of self-hosting, there are many metrics for success: 99.9% uptime, sub-second latency, or a perfect GitOps pipeline. But for those of us running &amp;ldquo;production&amp;rdquo; at home, there is only one metric that truly matters: &lt;strong&gt;The Wife Acceptance Factor (WAF)&lt;/strong&gt;.&lt;/p&gt;
&lt;p&gt;My detailed Grafana dashboards said everything was fine. But my wife said the SSO login was &amp;ldquo;slow sometimes.&amp;rdquo; She was right. Debugging it took me down a rabbit hole of connection pooling, misplaced assumptions, and the harsh reality of running databases on distributed storage.&lt;/p&gt;</description></item><item><title>How I Got Open WebUI Talking to OpenAI Web Search</title><link>https://ericxliu.me/posts/open-webui-openai-websearch/</link><pubDate>Mon, 29 Dec 2025 00:00:00 +0000</pubDate><guid>https://ericxliu.me/posts/open-webui-openai-websearch/</guid><description>&lt;p&gt;OpenAI promised native web search in GPT‑5, but LiteLLM proxy deployments (and by extension Open WebUI) still choke on it—issue &lt;a href="https://github.com/BerriAI/litellm/issues/13042" class="external-link" target="_blank" rel="noopener"&gt;#13042&lt;/a&gt; tracks the fallout. I needed grounded answers inside Open WebUI anyway, so I built a workaround: route GPT‑5 traffic through the Responses API and mask every &lt;code&gt;web_search_call&lt;/code&gt; before the UI ever sees it.&lt;/p&gt;
&lt;p&gt;This post documents the final setup, the hotfix script that keeps LiteLLM honest, and the tests that prove Open WebUI now streams cited answers without trying to execute the tool itself.&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;This post documents the final setup, the hotfix script that keeps LiteLLM honest, and the tests that prove Open WebUI now streams cited answers without trying to execute the tool itself.&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;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;

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<a class=title href=/posts/transformer-s-core-mechanics/>Transformer's Core Mechanics</a></li><li><span class=date>October 26, 2020</span>
<a class=title href=/posts/useful/>Some useful files</a></li></ul><ul class=pagination><li><a href=/posts/>&#171;</a></li><li class=hidden><a href=/posts/page/2/>&#8249;</a></li><li><a href=/posts/>1</a></li><li><a href=/posts/page/2/>2</a></li><li>3</li></ul></section></div><footer class=footer><section class=container>©
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<!doctype html><html lang=en><head><title>Why I Downgraded Magisk to Root My Pixel 2 XL · 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="For the past few weeks, I&rsquo;ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn&rsquo;t proof.
Static analysis has its limits. I found the &ldquo;smoking gun&rdquo; function—a native method responsible for encrypting the login payload—but understanding how it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache."><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="Why I Downgraded Magisk to Root My Pixel 2 XL"><meta name=twitter:description content="For the past few weeks, I’ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn’t proof.
Static analysis has its limits. I found the “smoking gun” function—a native method responsible for encrypting the login payload—but understanding how it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache."><meta property="og:url" content="https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/"><meta property="og:site_name" content="Eric X. Liu's Personal Page"><meta property="og:title" content="Why I Downgraded Magisk to Root My Pixel 2 XL"><meta property="og:description" content="For the past few weeks, I’ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn’t proof.
Static analysis has its limits. I found the “smoking gun” function—a native method responsible for encrypting the login payload—but understanding how it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache."><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="article:section" content="posts"><meta property="article:published_time" content="2026-01-07T00:00:00+00:00"><meta property="article:modified_time" content="2026-01-08T06:02:38+00:00"><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/posts/rooting-pixel-2-xl-for-reverse-engineering/><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><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><script type=application/ld+json>{"@context":"http://schema.org","@type":"BlogPosting","headline":"Why I Downgraded Magisk to Root My Pixel 2 XL","genre":"Blog","wordcount":"775","url":"https:\/\/ericxliu.me\/posts\/rooting-pixel-2-xl-for-reverse-engineering\/","datePublished":"2026-01-07T00:00:00\u002b00:00","dateModified":"2026-01-08T06:02:38\u002b00:00","description":"\u003cp\u003eFor the past few weeks, I\u0026rsquo;ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn\u0026rsquo;t proof.\u003c\/p\u003e\n\u003cp\u003eStatic analysis has its limits. I found the \u0026ldquo;smoking gun\u0026rdquo; function—a native method responsible for encrypting the login payload—but understanding \u003cem\u003ehow\u003c\/em\u003e it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache.\u003c\/p\u003e","author":{"@type":"Person","name":"Eric X. Liu"}}</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 post"><article><header><div class=post-title><h1 class=title><a class=title-link href=https://ericxliu.me/posts/rooting-pixel-2-xl-for-reverse-engineering/>Why I Downgraded Magisk to Root My Pixel 2 XL</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=2026-01-07T00:00:00Z>January 7, 2026
</time></span><span class=reading-time><i class="fa-solid fa-clock" aria-hidden=true></i>
4-minute read</span></div></div></header><div class=post-content><p>For the past few weeks, I&rsquo;ve been stuck in a stalemate with my EcoFlow Bluetooth Protocol Reverse Engineering Project. I have the hci snoop logs, I have the decompiled APK, and I have a strong suspicion about where the authentication logic is hiding. But suspicion isn&rsquo;t proof.</p><p>Static analysis has its limits. I found the &ldquo;smoking gun&rdquo; function—a native method responsible for encrypting the login payload—but understanding <em>how</em> it constructs that payload within a strict 13-byte limit purely from assembly (ARM64) was proving to be a headache.</p><p>I needed to move from <strong>static analysis</strong> to <strong>dynamic analysis</strong>. I needed to hook the function at runtime, inspect the memory, and see the data before it gets encrypted. To do that, I needed a rooted Android device.</p><p>The only candidate in my drawer? An 8-year-old <strong>Google Pixel 2 XL (&ldquo;taimen&rdquo;)</strong> that hadn&rsquo;t been turned on since 2017.</p><h2 id=the-objective>The Objective
<a class=heading-link href=#the-objective><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>Bring this relic back to life, update it to the final official firmware, and gain <code>su</code> access to install Frida and tcpdump. It sounds simple, but 2026 tools don&rsquo;t always play nice with 2017 hardware.</p><h2 id=phase-1-the-i-forgot-my-password-hurdle>Phase 1: The &ldquo;I Forgot My Password&rdquo; Hurdle
<a class=heading-link href=#phase-1-the-i-forgot-my-password-hurdle><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 first problem was mundane: I didn&rsquo;t remember the PIN. My only way in was a physical <strong>Hard Reset</strong>, which relies on a specific sequence of hardware button inputs:</p><ol><li><strong>Fastboot Mode</strong>: Hold <code>Power</code> + <code>Vol Down</code> until the familiar bootloader screen appears.</li><li><strong>Recovery Mode</strong>: Use volume keys to select &ldquo;Recovery Mode&rdquo;.</li><li><strong>The &ldquo;No Command&rdquo; Trick</strong>: The phone reboots to a broken android logo. To get the actual menu, you have to hold <code>Power</code> and tap <code>Vol Up</code> <em>once</em>.</li><li><strong>Wipe</strong>: Select <code>Wipe data/factory reset</code>.</li></ol><p><strong>The Catch</strong>: This triggers <strong>Factory Reset Protection (FRP)</strong>. Upon boot, the device required authentication with the Google Account previously synced to the hardware. Since I verified my identity using the original credentials, I could proceed; otherwise, bypassing this security feature would have been a significant roadblock.</p><h2 id=phase-2-the-update-trap>Phase 2: The Update Trap
<a class=heading-link href=#phase-2-the-update-trap><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>Once in, I checked the version: <code>Android 10 (QP1A.190711.020)</code>. This was ancient. The Pixel 2 XL officially supports Android 11, and I wanted the latest possible base for compatibility with modern tools.</p><p>I tried the easy route: <strong>Settings > System Update</strong>.
<strong>The Result</strong>: Failure. The phone refused to pull the final OTA (<code>RP1A.201005.004.A1</code>), likely due to the Google update servers no longer prioritizing this EOL device.</p><h3 id=the-fix-manual-flashing>The Fix: Manual Flashing
<a class=heading-link href=#the-fix-manual-flashing><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>I had to bypass the OTA system entirely. I downloaded the <a href=https://developers.google.com/android/images class=external-link target=_blank rel=noopener>final Factory Image</a> from Google.</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-bash data-lang=bash><span style=display:flex><span><span style=color:#8b949e;font-style:italic># Don&#39;t rely on OTA. Flash the whole valid state.</span>
</span></span><span style=display:flex><span>fastboot -w update image-taimen-rp1a.201005.004.a1.zip
</span></span></code></pre></div><p><em>Note: I used the <code>-w</code> flag here since I had just wiped the device anyway. This gave me a pristine, stock Android 11 environment to break.</em></p><h2 id=phase-3-the-magisk-time-travel>Phase 3: The Magisk &ldquo;Time Travel&rdquo;
<a class=heading-link href=#phase-3-the-magisk-time-travel><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>This is where &ldquo;modern tools meets old hardware&rdquo; caused the most pain.</p><p><strong>The Hypothesis</strong>: Rooting a Pixel is standard procedure.</p><ol><li>Extract <code>boot.img</code> from the factory zip.</li><li>Patch it with the latest <strong>Magisk</strong> app.</li><li>Flash it back.</li></ol><p><strong>The Reality</strong>: Bootloop.
I used <strong>Magisk v30.6</strong> (the latest as of writing). The patch process &ldquo;succeeded,&rdquo; but flashing the resulting image caused the phone to immediately crash back to the bootloader with a &ldquo;Cannot find valid operating system&rdquo; error.</p><h3 id=debugging-the-bootloop>Debugging the Bootloop
<a class=heading-link href=#debugging-the-bootloop><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>I suspected a regression in how modern Magisk handles the antiquated boot partition structure of the Pixel 2 (A/B partitions, but pre-GKI).</p><p>I decided to perform some &ldquo;software archaeology&rdquo; and use a version of Magisk that was contemporary with the device&rsquo;s lifespan. I grabbed <strong>Magisk v25.0</strong> (released around 2022).</p><ol><li><strong>Repatch</strong>: I patched the <em>exact same</em> stock <code>boot.img</code> using the v25.0 app.</li><li><strong>Reflash</strong>:</li></ol><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># Flash to both slots to be safe</span>
</span></span><span style=display:flex><span>fastboot flash boot_a magisk_patched_25000.img
</span></span><span style=display:flex><span>fastboot flash boot_b magisk_patched_25000.img
</span></span></code></pre></div><p><strong>The Result</strong>: Success. The phone booted, and the Magisk app confirmed <code>Installed: 25.0</code>.</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-bash data-lang=bash><span style=display:flex><span>❯ adb shell <span style=color:#a5d6ff>&#34;su -c id&#34;</span>
</span></span><span style=display:flex><span><span style=color:#79c0ff>uid</span><span style=color:#ff7b72;font-weight:700>=</span>0<span style=color:#ff7b72;font-weight:700>(</span>root<span style=color:#ff7b72;font-weight:700>)</span> <span style=color:#79c0ff>gid</span><span style=color:#ff7b72;font-weight:700>=</span>0<span style=color:#ff7b72;font-weight:700>(</span>root<span style=color:#ff7b72;font-weight:700>)</span> <span style=color:#79c0ff>groups</span><span style=color:#ff7b72;font-weight:700>=</span>0<span style=color:#ff7b72;font-weight:700>(</span>root<span style=color:#ff7b72;font-weight:700>)</span> <span style=color:#79c0ff>context</span><span style=color:#ff7b72;font-weight:700>=</span>u:r:magisk:s0
</span></span></code></pre></div><h2 id=key-insights>Key Insights
<a class=heading-link href=#key-insights><i class="fa-solid fa-link" aria-hidden=true title="Link to heading"></i>
<span class=sr-only>Link to heading</span></a></h2><ul><li><strong>Don&rsquo;t Trust OTAs on EOL Devices</strong>: If you&rsquo;re reviving old hardware, the OTA mechanism is likely broken or unreliable. Go straight to the factory images.</li><li><strong>Version Matching Matters</strong>: Tools like Magisk evolve. Using a 2026 root method on a 2017 kernel is a recipe for instability. Sometimes, downgrading your tools is the only way forward.</li><li><strong>A/B Partitions</strong>: Always flash your patched boot image to <em>both</em> slots (<code>boot_a</code> and <code>boot_b</code>) to avoid active slot mismatches causing boot failures.</li></ul><p>With root access secured, the path is now clear to install Frida and finally intercept those elusive EcoFlow authentication packets.</p><h2 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></h2><ol><li><a href=https://developers.google.com/android/images class=external-link target=_blank rel=noopener>Google Pixel Factory Images</a></li><li><a href=https://topjohnwu.github.io/Magisk/install.html class=external-link target=_blank rel=noopener>Magisk Installation Guide</a></li><li><a href=https://github.com/topjohnwu/Magisk/releases class=external-link target=_blank rel=noopener>Magisk GitHub Releases</a></li><li><a href=https://xdaforums.com/t/guide-unlock-flash-root-for-the-pixel-2-xl-taimen.3702418/ class=external-link target=_blank rel=noopener>XDA Guide: Unlock/Flash/Root Pixel 2 XL</a></li></ol></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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<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/technical-deep-dive-llm-categorization/>From Gemini-3-Flash to T5-Gemma-2: A Journey in Distilling a Family Finance LLM</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=2025-12-27T00:00:00Z>December 27, 2025
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7-minute read</span></div></div></header><div class=post-content><p>Running a family finance system is surprisingly complex. What starts as a simple spreadsheet often evolves into a web of rules, exceptions, and &ldquo;wait, was this dinner or <em>vacation</em> dinner?&rdquo; questions.</p><p>For years, I relied on a rule-based system to categorize our credit card transactions. It worked&mldr; mostly. But maintaining <code>if "UBER" in description and amount > 50</code> style rules is a never-ending battle against the entropy of merchant names and changing habits.</p><p>Recently, I decided to modernize this stack using Large Language Models (LLMs). This post details the technical journey from using an off-the-shelf commercial model to distilling that knowledge into a small, efficient local model (<code>google/t5gemma-2-270m</code>) that runs on my own hardware while maintaining high accuracy.</p><h2 id=phase-1-the-proof-of-concept-with-commercial-llms>Phase 1: The Proof of Concept with Commercial LLMs
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