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  • shoyer · 2 ✖

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  • align() should align chunks · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
457281032 https://github.com/pydata/xarray/issues/979#issuecomment-457281032 https://api.github.com/repos/pydata/xarray/issues/979 MDEyOklzc3VlQ29tbWVudDQ1NzI4MTAzMg== shoyer 1217238 2019-01-24T17:19:30Z 2019-01-24T17:19:30Z MEMBER

I think dask.array handles this differing chunk sizes better these days, so perhaps this is no longer necessary.

 
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   align() should align chunks 172291585
241232491 https://github.com/pydata/xarray/issues/979#issuecomment-241232491 https://api.github.com/repos/pydata/xarray/issues/979 MDEyOklzc3VlQ29tbWVudDI0MTIzMjQ5MQ== shoyer 1217238 2016-08-21T00:55:11Z 2016-08-21T00:55:11Z MEMBER

I agree that it would make sense for xarray.align to unify chunks in dask arrays, but the documentation is actually a little out of date here: dask.array does now do some minimal automatic rechunking (see unify_chunks for details). Also, dask array functions, at least those that use elemwise, do automatically coerce NumPy arrays into dask arrays. So adding a tiny numpy array to a huge dask array does currently do the right thing.

As you can see, the automatic rechunking algorithm that dask.array currently uses is super simple: it only reconciles chunks when one array is unchunked. I'm certainly open to more sophisticated options for automatic rechunking (see https://github.com/dask/dask/issues/111), but either way I'd prefer to keep as much of this logic on the dask side as possible. Ideally, we'd simply call dask.array.unify_chunks passing in the named dimensions for each array.

 
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   align() should align chunks 172291585

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