<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"><channel><title>Dataraft notes</title><description>Engineering write-ups from Dataraft projects.</description><link>https://dataraft.work/</link><item><title>95.0% on a sealed holdout, and the experiments that made it worse</title><link>https://dataraft.work/notes/sealed-holdout/</link><guid isPermaLink="true">https://dataraft.work/notes/sealed-holdout/</guid><description>Our crash classifier scored 95.0% on 300 sealed cases. Every point gained came from the checks around the model. Every experiment on the model itself lost ground.</description><pubDate>Fri, 17 Jul 2026 00:00:00 GMT</pubDate><author>arun@dataraft.work (Arun Kishore)</author></item></channel></rss>