Level 6 of 27 · AI Workbench
Feature work and the model bake-off
Level 6 of 27 in the AI Workbench: a free AI exercise at Intermediate level, which takes about 30 minutes. Make new features, compare four models on 5-fold cross-validation, choose the simplest model within reach of the best, and look at the test rows once.
Goal
Make new features, compare four models on 5-fold cross-validation, choose the simplest model within reach of the best, and look at the test rows once.
Done when
The acceptance test marks the skills this level practises.
- Feature engineering
- Cross-validation
- Model comparison
- Honest test
- Experiment log
Skills
- Feature engineering
- Cross-validation
- Model comparison
- Honest test
- Experiment log
Before you start
Level 5, Overfitting: tune the tree, comes first. Do it first if the ideas are new to you.
Free, in your browser, nothing to install. Your work is saved on this device. Updated 15 Nov 2026.