[Numpy-discussion] [API] (minor change) Allow multiple axes in `expand_dims`

[Stephan Hoyer]

This looks good to me!

On Mon, Dec 2, 2019 at 11:13 AM Sebastian Berg <sebastian at sipsolutions.net>
wrote:

> Hi all,
>
> Pull request 14051:
>
> https://github.com/numpy/numpy/pull/14051
>
> means that `np.expand_dims` now accepts multiple axes in the `axis`
> argument. As before, the axis signal where a new axis is in the output
> array. From the new tests:
>
> a = np.empty((3, 3, 3))
> np.expand_dims(a, axis=(0, 1, 2)).shape == (1, 1, 1, 3, 3, 3)
> np.expand_dims(a, axis=(0, -1, -2)).shape == (1, 3, 3, 3, 1, 1)
> np.expand_dims(a, axis=(0, 3, 5)).shape == (1, 3, 3, 1, 3, 1)
> np.expand_dims(a, axis=(0, -3, -5)).shape == (1, 1, 3, 1, 3, 3)
>
> We believe this is an uncontroversial generalization, but pinging the
> mailing list since it is an API change. If anyone is concerned please I
> will be happy to revert, otherwise this is expected to be included in
> 1.18.
>
> Cheers,
>
> Sebastian
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