8000 MNT Cleaner cython cdef loss function in SGD by lorentzenchr · Pull Request #17191 · scikit-learn/scikit-learn · GitHub
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MNT Cleaner cython cdef loss function in SGD #17191

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Merged
merged 2 commits into from
May 12, 2020
Merged

MNT Cleaner cython cdef loss function in SGD #17191

merged 2 commits into from
May 12, 2020

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lorentzenchr
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What does this implement/fix? Explain your changes.

This PR simpliefies the derivative loss functions for SGD. It makes the distinction bewtween cdef dloss() nogil: for productive use and def py_dloss(): for calls in the test suite only.

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rth commented May 12, 2020

Thanks! I think,

    cpdef double dloss(self, double p, double y) nogil:

might work (and allow access from pure Python) as long as the corresponding classes are decorated with cython.final to mark them as not subclassable: https://stackoverflow.com/a/37869168/1791279 Whether it's worth it I am not sure. The current solution is also acceptable.

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cdef class LossFunction is subclassed and we want to test the dloss of the subclasses. I guess the @cython.final trick might not work here. (But good to know that trick!)

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rth commented May 12, 2020

No I mean dloss loss is defined on subclasses, right? So that's where the final decorator could also be applied (not on the base class)..

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rth commented May 12, 2020

I'm not saying that we should do it though, just that it might be possible.

Any opinions @thomasjpfan @jeremiedbb ?

NicolasHug
NicolasHug approved these changes May 12, 2020
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Looks good

One tiny perk of using the wrapper instead of cpdef is that compilation will be slightly faster compared to duplicating all methods

rth
rth approved these changes May 12, 2020
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OK, sounds good. Thanks!

@rth rth changed the title [MRG] MNT Cleaner cythn cdef loss function in SGD MNT Cleaner cythn cdef loss function in SGD May 12, 2020
@rth rth merged commit 4b92a77 into scikit-learn:master May 12, 2020
@lorentzenchr lorentzenchr changed the title MNT Cleaner cythn cdef loss function in SGD MNT Cleaner cython cdef loss function in SGD May 12, 2020
@lorentzenchr lorentzenchr deleted the sgd_clean branch May 12, 2020 21:13
gio8tisu pushed a commit to gio8tisu/scikit-learn that referenced this pull request May 15, 2020
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MNT Cleaner cythn cdef loss function in SGD (scikit-learn#17191)
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@rth rth mentioned this pull request Jun 18, 2020
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viclafargue pushed a commit to viclafargue/scikit-learn that referenced this pull request Jun 26, 2020
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MNT Cleaner cythn cdef loss function in SGD (scikit-learn#17191)
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jayzed82 pushed a commit to jayzed82/scikit-learn that referenced this pull request Oct 22, 2020
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MNT Cleaner cythn cdef loss function in SGD (scikit-learn#17191)
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@rth rth rth approved these changes

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