Sunday, 06 September 2026
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Cross-validation and hyperparameter tuning

Machine learning with Python · lesson 9 of 12

Lesson 9 needs a free account

The first 3 lessons of every track are open to everyone. From here on Yanjye has to remember where you stopped, mark your exam and put your name on the certificate — so it needs to know who you are.

This lesson: Estimate performance reliably and tune without deceiving yourself.

  • Free — the lessons and the exam never cost anything
  • Your progress is saved across every device
  • Pass the exam and earn a certificate anyone can verify

Or go back to Machine learning with Python and finish the free lessons first.

All lessons in this track

  1. 1
  2. 2
  3. 3
  4. 4
    Regression metrics: MAE, RMSE and R² ~25 min account needed
  5. 5
    Classification: predicting a category ~30 min account needed
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
    Trees, forests and gradient boosting ~30 min account needed
  11. 11
  12. 12
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