Errata

Hands-On Machine Learning with Scikit-Learn and PyTorch

Errata for Hands-On Machine Learning with Scikit-Learn and PyTorch

Submit your own errata for this product.

The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted By Date submitted Date corrected
Page Chapter 17. Advanced Transformer Techniques
End of Page

The link for reading advanced transformer techniques online is not working, there is no preview available online on Google drive.

Note from the Author or Editor:
Thanks for your feedback. The online content is being finalized now, it will be up shortly at: https://homl.info/
(the old link https://homl.info/att will just redirect to this address).

 Anonymous  Sep 18, 2025  Oct 22, 2025
Page Chapter 2 and Chapter 12
In the "Popular open data repositories" list and at the end of Chapter 12

Both locations mention PapersWithCode.com, which has now been discontinued and redirects to Hugging Face's trending papers section instead.

Note from the Author or Editor:
Great catch, thanks. I changed the link to point directly to HF papers.

 Anonymous  Oct 10, 2025  Oct 22, 2025
Page Chapter 19
Equation 19-7. Q-learning using an exploration function

I believe equation 19-7 has a minor formatting issue: a missing open parenthesis in the MathML: <mfenced separators="" open="" close=")">. This appears correctly in the 3rd edition.

Note from the Author or Editor:
Thanks for your feedback. I cannot see this issue right now, so I suppose it was fixed in the last stages of production.

 Dylan  Oct 25, 2025 
Page 19
-

the 2 links provided on page 19-20 to submit the errata are wrong on.

"We have a web page for this book, where we list errata, examples, and any additional information. You can access this page at homl_dot_info/oreilly-p"
&
"....if you find errors in the code examples (or just to ask questions), or to submit errata if you find errors in the text. "

Note from the Author or Editor:
Thanks for your feedback. The link is now fixed.

 Sabri Hamad  Jun 25, 2025  Oct 22, 2025
Page 83
-

equation 2-1 has a formatting problem (missing opening parenthesis) on oreilly's web viewer but not on oreilly's app!

Note from the Author or Editor:
Thanks for your feedback. The production team is looking into this and have found the cause. It will be fixed soon.
Aurélien

 Sabri Hamad  Jun 25, 2025  Oct 22, 2025