[Numpy-discussion] NEP 21: Simplified and explicit advanced indexing (original) (raw)

Stephan Hoyer shoyer at gmail.com
Tue Jun 26 21:13:25 EDT 2018

On Tue, Jun 26, 2018 at 4:34 PM Robert Kern <robert.kern at gmail.com> wrote:

I maintain that considering deprecation is premature at this time. Please take it out of this NEP. Let us get a feel for how people actually use .oindex/.vindex. Then we can talk about deprecation. This NEP gets my enthusiastic approval, except for the deprecation. I will be happy to talk about deprecation with an open mind in a few years. With some more actual experience under our belt, rather than prediction and theory, we can be more confident about the approach we want to take. Deprecation is not a fundamental part of this NEP and can be decided independently at a later time.

I agree, we should scale back most of the deprecations proposed in this NEP, leaving them for possible future work. In particular, you're not convinced yet that "outer indexing" is a more intuitive default indexing mode than "vectorized indexing", so it is premature to deprecate vectorized indexing behavior that conflicts with outer indexing. OK, fair enough.

I would still like to include at least two more limited form of deprecation that I hope will be less controversial:

In the long term, although I agree with Sebastian that "outer indexing" is more intuitive for default indexing behavior, I would really like to eliminate the "dimension reordering" behavior of mixed array/slice indexing altogether. This is a weird special case that is different between indexing like array[...] from array.vindex[...]. So if we don't choose to deprecate all cases where [] and oindex[] are different, I would at least like to deprecate all cases where [] and vindex[] are different. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20180626/0c725406/attachment.html>

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