[Numpy-discussion] `keepdims=True` for argmin/argmx and C-API `PyArray_ArgMaxWithKeepdims`

[Gagandeep Singh]

Hi,

So should I remove these new functions from public C-API? Let me know. I
will do that.

On Thu, 1 Jul, 2021, 10:02 pm Sebastian Berg, <sebastian at sipsolutions.net>
wrote:

> On Thu, 2021-07-01 at 00:39 -0700, Stefan van der Walt wrote:
> > Hi Sebastian,
> >
> > On Wed, Jun 30, 2021, at 18:23, Sebastian Berg wrote:
> > > The PR https://github.com/numpy/numpy/pull/19211 proposes to extend
> > > argmin and argmax with a `keepdims=False` keyword-only argument.
> >
> > This seems consistent with existing APIs, so I'm not concerned.
> >
> > For those wondering, `keepdims` preserves the number of dimensions of
> > the original array in a reduction operation like `sum`:
> >
> > In [1]: X = np.random.random((10, 15))
> >
> > In [2]: np.sum(X).shape
> > Out[2]: ()
> >
> > In [3]: np.sum(X, keepdims=True).shape
> > Out[3]: (1, 1)
> >
> > This is sometimes useful for broadcasting.
> >
> > > The PR  also proposes to add:
> > >
> > > * `PyArray_ArgMinWithKeepdims`
> > > * `PyArray_ArgMaxWithKeepdims`
> >
> > I am curious whether this is our general pattern for adding keyword
> > argument functionality to functions in the C-API.  It seems a bit
> > excessive!
>
> True, I am now tending a bit towards delaying this until someone
> actually asks for it...
> In most use-cases just using the Python API is likely only a small
> overhead anyway if done right.
>
> I do not think we have a pattern.  We do have some functions with the
> pattern of `With...And...` to allow signatures of different complexity.
> But very few of this type of python additions ever made it into the C-
> API.  For `Reshape`, `order=` was added by introducing `NewShape`.
>
> I have some hope that very long-term, HPy might solve this for us...
>
> Cheers,
>
> Sebastian
>
>
>
> >
> > Stéfan
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>
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