Hi Kevin,

out of interest, how did you decide to use scikit-learn v0.23 in the book?
I was surprised by that because it is a fairly old version. Lots of effort
has gone into scikit-learn since then, so understanding why people choose
(or are forced to?) use such old versions would be useful.

T

On Wed, 11 Mar 2026 at 22:38, Kevin Markham <[email protected]> wrote:

> Hi Thomas,
>
> Thank you so much for your suggestion! I’d love to include that (and many
> of the other newer features) in a future edition of the book, assuming
> there’s enough interest!
>
> Best,
> Kevin
>
>
> On Mar 11, 2026 at 3:33:31 PM, Thomas Fan via scikit-learn <
> [email protected]> wrote:
>
>> Thank you for sharing!
>>
>> In the “Tuning the decision threshold” section, scikit-learn now has a 
>> TunedThresholdClassifierCV!
>> It could be worthwhile to include in the second edition. 😆
>>
>> 3.3. Tuning the decision threshold for class prediction
>> <https://scikit-learn.org/stable/modules/classification_threshold.html#tunedthresholdclassifiercv>
>> scikit-learn.org
>> <https://scikit-learn.org/stable/modules/classification_threshold.html#tunedthresholdclassifiercv>
>> [image: favicon.ico]
>> <https://scikit-learn.org/stable/modules/classification_threshold.html#tunedthresholdclassifiercv>
>> <https://scikit-learn.org/stable/modules/classification_threshold.html#tunedthresholdclassifiercv>
>>
>> Best,
>> Thomas
>>
>> On Mar 11, 2026, at 10:30 AM, Kevin Markham <[email protected]> wrote:
>>
>> 
>> Hello scikit-learn community!
>>
>> Last week I published a new book called “Master Machine Learning with
>> scikit-learn”, and as my gift to the community, I’ve made it free to read
>> online (with no ads and no registration required):
>>
>> https://mlbook.dataschool.io
>>
>> I designed it to be a “practitioner’s handbook" for the effective use of
>> scikit-learn, covering many practical topics that I’ve not seen covered
>> elsewhere. I hope that it fills a useful role in the ecosystem of
>> scikit-learn educational resources, and perhaps even plays a tiny role in
>> ensuring the long-term success of the library. (I’ve already heard from two
>> teachers who would like to use the book in their classrooms, which is great
>> news!)
>>
>> If you're a current or former Core Contributor, I would be honored to
>> send you a free paperback copy as a token of my appreciation. Just reply to
>> me (not the list!) with your mailing address and I’ll ship you a copy from
>> Amazon. (It’s already available in a dozen countries, and I’m actively
>> working to expand distribution elsewhere.)
>>
>> Thanks!
>> Kevin
>>
>> P.S. In case you’re curious, I used Quarto to output the book website,
>> ebook (PDF and EPUB), and paperback from a single set of source files.
>> Quarto is amazing!!!
>>
>> Kevin Markham
>> Founder, Data School
>> ML book on Amazon: https://geni.us/MasterML
>> Data Science courses: https://courses.dataschool.io
>>
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