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FIX Uses log2 in tree building #30557

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Merged
jeremiedbb merged 6 commits into from
Jan 2, 2025
Merged

FIX Uses log2 in tree building #30557

jeremiedbb merged 6 commits into from
Jan 2, 2025

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@thomasjpfan
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@thomasjpfan thomasjpfan commented Dec 30, 2024

Reference Issues/PRs

Fixes #30554

What does this implement/fix? Explain your changes.

This PR replaces log with log2 and explicitly uses that in sklearn/tree/_partitioner.pyx, so it's more clear that we are using base 2.

@thomasjpfan thomasjpfan added this to the 1.6.1 milestone Dec 30, 2024
@thomasjpfan thomasjpfan changed the title Adds whats new BUG: Uses log2 in tree building Dec 30, 2024
@thomasjpfan thomasjpfan changed the title BUG: Uses log2 in tree building FIX Uses log2 in tree building Dec 30, 2024
@thomasjpfan thomasjpfan mentioned this pull request Dec 30, 2024
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github-actions bot commented Dec 30, 2024 •
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OmarManzoor
OmarManzoor approved these changes Dec 30, 2024
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LGTM. Thanks @thomasjpfan

@OmarManzoor OmarManzoor added Waiting for Second Reviewer First reviewer is done, need a second one! Quick Review For PRs that are quick to review labels Dec 30, 2024
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jeremiedbb commented Dec 30, 2024

The name of the fragment should be 30557.fix.rst. Otherwise LGTM

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glemaitre commented Dec 30, 2024

Do you think that it is worth a minimal non-regression test to acknowledge that we use the log2?

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ogrisel commented Dec 30, 2024

We might also want to delete the log function of https://github.com/scikit-learn/scikit-learn/blob/6385b7f7f4395f050cb4c85449fa3987031598c1/sklearn/tree/_utils.pyx#L65C1-L66C27 and update any remaining calls such as sklearn/tree/_criterion.pyx to cimport log2 from libc.math instead.

This change would better be done in another MAINT PR that would not be part of the 1.6.1 released fix.

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ogrisel commented Dec 30, 2024

Do you think that it is worth a minimal non-regression test to acknowledge that we use the log2?

I approved the PR but forgot about this point. I am not sure how to do that, but it would be great to find a way.

thomasjpfan
thomasjpfan commented Dec 31, 2024
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I added a non-regression test that uses an example that fails on main and passes with this PR.

sklearn/tree/_partitioner.pyx
best.pos += best.n_missing


def _py_sort(float32_t[::1] feature_values, intp_t[::1] samples, intp_t n):
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I added this function to test sort directly.

@jeremiedbb jeremiedbb merged commit 19ef479 into scikit-learn:main Jan 2, 2025
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jeremiedbb pushed a commit to jeremiedbb/scikit-learn that referenced this pull request Jan 8, 2025
@thomasjpfan @jeremiedbb
FIX Uses log2 in tree building (scikit-learn#30557)
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jeremiedbb pushed a commit that referenced this pull request Jan 9, 2025
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FIX Uses log2 in tree building (#30557)
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@MatthewMiddlehurst MatthewMiddlehurst mentioned this pull request Jan 9, 2025
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@ogrisel ogrisel ogrisel approved these changes

@OmarManzoor OmarManzoor OmarManzoor approved these changes

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scikit-learn 1.6 changed behavior of growing trees

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