<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Xuanyu Chen</title><description>Applied Math &amp; Statistics @ Purdue | Quant / Data Analytics | Backtesting &amp; NLP/LLM pipelines.</description><link>https://xuanyuchen.com/</link><language>en-us</language><item><title>Fine-Tuning (2): LoRA Fine-tuning</title><link>https://xuanyuchen.com/posts/2026-04-04-fine-tuning-2-lora/</link><guid isPermaLink="true">https://xuanyuchen.com/posts/2026-04-04-fine-tuning-2-lora/</guid><description>How LoRA works, how quantization reduces memory, and how QLoRA combines both for efficient fine-tuning.</description><pubDate>Sat, 04 Apr 2026 00:00:00 GMT</pubDate><category>ai</category><category>fine-tuning</category><category>llm</category><category>lora</category></item><item><title>Oil Markets (2): Oil Pricing</title><link>https://xuanyuchen.com/posts/2026-03-22-oil-markets-2-oil-pricing/</link><guid isPermaLink="true">https://xuanyuchen.com/posts/2026-03-22-oil-markets-2-oil-pricing/</guid><description>How oil is priced through spot and futures markets, what moves oil prices, and what the spreads between benchmarks tell us about the market.</description><pubDate>Sun, 22 Mar 2026 00:00:00 GMT</pubDate><category>oil</category><category>finance</category><category>investing</category></item><item><title>Fine-Tuning (1): Basics</title><link>https://xuanyuchen.com/posts/2026-03-22-fine-tuning-1-basics/</link><guid isPermaLink="true">https://xuanyuchen.com/posts/2026-03-22-fine-tuning-1-basics/</guid><description>The fundamentals of fine-tuning a large language model — from data preparation and hyperparameters to the training loop and evaluation.</description><pubDate>Sun, 22 Mar 2026 00:00:00 GMT</pubDate><category>ai</category><category>fine-tuning</category><category>llm</category></item><item><title>Oil Markets (1): Oil Basics</title><link>https://xuanyuchen.com/posts/2026-03-21-oil-markets-1-oil-basics/</link><guid isPermaLink="true">https://xuanyuchen.com/posts/2026-03-21-oil-markets-1-oil-basics/</guid><description>What is crude oil, what comes out of a barrel, who produces and consumes it, and how it moves around the world — the foundation for understanding oil prices.</description><pubDate>Sat, 21 Mar 2026 00:00:00 GMT</pubDate><category>oil</category><category>finance</category><category>investing</category></item><item><title>XYZBudget v1.1 — Plan First, Then Spend</title><link>https://xuanyuchen.com/posts/2026-03-01-xyzbudget-v1-1/</link><guid isPermaLink="true">https://xuanyuchen.com/posts/2026-03-01-xyzbudget-v1-1/</guid><description>A personal budgeting web app that reverses the typical spending-then-tracking loop. Plan your budget first, then track transactions against the plan with live variance.</description><pubDate>Sun, 01 Mar 2026 00:00:00 GMT</pubDate><category>project</category><category>web-dev</category><category>next-js</category><category>supabase</category></item></channel></rss>