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  • crusaderky · 3 ✖

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  • apply_ufunc(dask='parallelized') output_dtypes for datasets · 3 ✖

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609650053 https://github.com/pydata/xarray/issues/1699#issuecomment-609650053 https://api.github.com/repos/pydata/xarray/issues/1699 MDEyOklzc3VlQ29tbWVudDYwOTY1MDA1Mw== crusaderky 6213168 2020-04-06T08:26:13Z 2020-04-06T08:26:13Z MEMBER

still relevant

 
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   apply_ufunc(dask='parallelized') output_dtypes for datasets 272004812
386721846 https://github.com/pydata/xarray/issues/1699#issuecomment-386721846 https://api.github.com/repos/pydata/xarray/issues/1699 MDEyOklzc3VlQ29tbWVudDM4NjcyMTg0Ng== crusaderky 6213168 2018-05-04T20:18:48Z 2018-05-04T20:21:10Z MEMBER

The key thing is that for most people it would be extremely elegant and practical to be able to duck-type wrappers around numpy, scipy, and numba kernels that automagically work with Variable, DataArray, and Dataset (see my example above). You'll agree on how ugly my 1-liner above would become: def myfunc(x): if isinstance(x, xarray.Dataset): dtype = x.dtypes else: # DataArray and Variable dtype = x.dtype return apply_ufunc(numpy_kernel, x, dask='parallelized', output_dtypes=[dtype]) If you don't like Dataset.dtype, then maybe we could add both Dataset.dtypes and DataArray.dtypes (which would be just an alias to DataArray.dtype)? I still like the former more though - I find it less confusing.

 
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   apply_ufunc(dask='parallelized') output_dtypes for datasets 272004812
384073275 https://github.com/pydata/xarray/issues/1699#issuecomment-384073275 https://api.github.com/repos/pydata/xarray/issues/1699 MDEyOklzc3VlQ29tbWVudDM4NDA3MzI3NQ== crusaderky 6213168 2018-04-24T20:42:57Z 2018-04-24T20:42:57Z MEMBER

@shoyer that seems counter-intuitive for me - you are returning two datasets after all. If we go with the list(dict) notation, we could also add a Dataset.dtype property, which (coherently with dims and chunks) would return a dict. This would be very handy as, in 99% of the times, people will want to write: def myfunc(x): return apply_ufunc(numpy_kernel, x, dask='parallelized', output_dtypes=[x.dtype]) which would magically work both when x is a DataArray and when it's a Dataset

 
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   apply_ufunc(dask='parallelized') output_dtypes for datasets 272004812

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