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  • aidanheerdegen · 4 ✖

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  • decode_cf called on mfdataset throws error: 'Array' object has no attribute 'tolist' · 4 ✖

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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
521524233 https://github.com/pydata/xarray/issues/3215#issuecomment-521524233 https://api.github.com/repos/pydata/xarray/issues/3215 MDEyOklzc3VlQ29tbWVudDUyMTUyNDIzMw== aidanheerdegen 6063709 2019-08-15T05:56:18Z 2019-08-15T05:57:40Z CONTRIBUTOR

Confirmed that NUMPY_EXPERIMENTAL_ARRAY_FUNCTION=0 fixes this issue for me.

Have submitted a PR with your suggested fix https://github.com/pydata/xarray/pull/3220

Confirmed the submitted code fixes my issue.

 
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   decode_cf called on mfdataset throws error: 'Array' object has no attribute 'tolist' 480512400
521504317 https://github.com/pydata/xarray/issues/3215#issuecomment-521504317 https://api.github.com/repos/pydata/xarray/issues/3215 MDEyOklzc3VlQ29tbWVudDUyMTUwNDMxNw== aidanheerdegen 6063709 2019-08-15T03:55:00Z 2019-08-15T03:55:00Z CONTRIBUTOR

Thanks for the explanation.

 
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   decode_cf called on mfdataset throws error: 'Array' object has no attribute 'tolist' 480512400
521502195 https://github.com/pydata/xarray/issues/3215#issuecomment-521502195 https://api.github.com/repos/pydata/xarray/issues/3215 MDEyOklzc3VlQ29tbWVudDUyMTUwMjE5NQ== aidanheerdegen 6063709 2019-08-15T03:40:27Z 2019-08-15T03:40:27Z CONTRIBUTOR

Thanks @shoyer.

I still don't understand the different code paths between decode_cf=True and decode_cf=False + explicit call to xarray.decode_cf()

 
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   decode_cf called on mfdataset throws error: 'Array' object has no attribute 'tolist' 480512400
521456728 https://github.com/pydata/xarray/issues/3215#issuecomment-521456728 https://api.github.com/repos/pydata/xarray/issues/3215 MDEyOklzc3VlQ29tbWVudDUyMTQ1NjcyOA== aidanheerdegen 6063709 2019-08-14T23:28:35Z 2019-08-14T23:28:35Z CONTRIBUTOR

Seems that this is by design, from here

Dask Array doesn’t implement operations like tolist that would be very inefficient for larger datasets. Likewise, it is very inefficient to iterate over a Dask array with for loops

So dask has never had a tolist method, so in one case the object is a dask array, but not in the other case.

I still don't understand why it fails when decode_cf is called separately. Suggests there is a different code path as all underlying packages are identical.

 
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   decode_cf called on mfdataset throws error: 'Array' object has no attribute 'tolist' 480512400

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