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Add migration guide page #668

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fixes #658

This PR,

  • Adds a new migration page
  • Adds the new page under the Other heading at the top-level structure

The idea is to start growing the migration page with more examples from NumPy to the Array API Standard. @asmeurer I don't know if you have other examples in mind to add them in this PR.

@steff456 steff456 added the Narrative Content Narrative documentation content. label Jul 30, 2023
@steff456 steff456 added this to the v2023 milestone Jul 30, 2023
@steff456 steff456 self-assigned this Jul 30, 2023

The Array API Standard was based in the common APIs across multiple Python array libraries as a response to the fragmentation of the ecosystem. It was decided for the Array API Standard to be as compact as possible, meaning that it doesn't include all the creation and manipulation functions available in other libraries, but it is equally as powerful. The aim of this guide is to help users get started with the use of the Array API by providing common equivalents with the NumPy API.

Depending on the version of the Array API Standard that you are intended to use, the number of total APIs may vary and this migration guide is using the latest version `v2022.12`.
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I think it is important to mention what version this page is using, but I also fear this can starts to be a maintenance burden. So please let me know if it is just better to refer to the "latest version" or if it is ok to flag the actual version.

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This looks good. My idea was indeed to have a table, like a Rosetta stone (e.g., like https://github.com/sympy/sympy/wiki/Git-hg-rosetta-stone).

I would add two notes to the text at the top:

  • Some functions aren't easy to translate. In that case, if they are important, people should check if they are discussed already at https://github.com/data-apis/array-api/issues and request them if not. Also point out that people may have to use library-specific code paths for certain things that aren't in the standard yet.

  • Note that people should feel free to contribute to the page.

I can see about adding a few things myself once this is merged.

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RFC: add ravel() (or flatten())
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