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  • UserWarning when wrapping pint & dask arrays together · 3 ✖

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872502631 https://github.com/pydata/xarray/issues/5559#issuecomment-872502631 https://api.github.com/repos/pydata/xarray/issues/5559 MDEyOklzc3VlQ29tbWVudDg3MjUwMjYzMQ== dcherian 2448579 2021-07-01T19:41:14Z 2021-07-01T19:41:14Z MEMBER

And the solution would be to just call the method on the duck array without any kind of type checking first?

Or np.method(array)

 
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   UserWarning when wrapping pint & dask arrays together 935062144
872499933 https://github.com/pydata/xarray/issues/5559#issuecomment-872499933 https://api.github.com/repos/pydata/xarray/issues/5559 MDEyOklzc3VlQ29tbWVudDg3MjQ5OTkzMw== TomNicholas 35968931 2021-07-01T19:35:43Z 2021-07-01T19:35:43Z MEMBER

So this is actually an xarray problem not a dask/pint problem? And the solution would be to just call the method on the duck array without any kind of type checking first?

 
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   UserWarning when wrapping pint & dask arrays together 935062144
872477132 https://github.com/pydata/xarray/issues/5559#issuecomment-872477132 https://api.github.com/repos/pydata/xarray/issues/5559 MDEyOklzc3VlQ29tbWVudDg3MjQ3NzEzMg== dcherian 2448579 2021-07-01T18:56:41Z 2021-07-01T18:59:27Z MEMBER

Is it correct that xarray ends up calling dask.array.mean() on the pint.Quantity(dask.Array) object inside the DataArray?

Yes that's correct. See https://github.com/pydata/xarray/blob/c472f8a4c79f872edb9dcd7825f786ecb9aff5c0/xarray/core/duck_array_ops.py#L49-L51

It may be time to update this method since we now depend on a minimum numpy version that supports NEP-18.

cc @shoyer

EDIT: You get there from _create_nan_agg_method: https://github.com/pydata/xarray/blob/c472f8a4c79f872edb9dcd7825f786ecb9aff5c0/xarray/core/duck_array_ops.py#L347

 
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   UserWarning when wrapping pint & dask arrays together 935062144

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