Train Your Own LLM: companion code for Chapter 7 Built 2026-10-08. Every listing is also printed in the book. Versions: see the book's version notes and www.ai021.ai/book. Licence: to be stated on www.ai021.ai/book when it is set. Not in this snapshot: ch07_lr_sweep.sh, curves/good.csv, curves/high.csv, curves/low.csv, curves/nozero.csv, curves/overfit.csv