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  • shoyer · 1 ✖

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  • MADIS netCDF to Pandas Dataframe: ValueError: iterator is too large · 1 ✖

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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
216086274 https://github.com/pydata/xarray/issues/838#issuecomment-216086274 https://api.github.com/repos/pydata/xarray/issues/838 MDEyOklzc3VlQ29tbWVudDIxNjA4NjI3NA== shoyer 1217238 2016-05-02T00:52:51Z 2016-05-02T00:52:51Z MEMBER

This is (arguably) a NumPy bug -- the problem is that the to_dataframe() call is trying to create an array with 8e30 elements!

ipdb> shape (72, 55, 60, 10, 4, 512, 51, 51, 12, 80, 3, 8, 6, 11, 5000, 25, 24, 6277, 24) ipdb> np.prod(shape) -8804073483760828416 ipdb> np.prod(np.asarray(shape, dtype=float)) 8.6981676921852312e+30

The problem is that these MADIS netCDFs have loads of dimensions, corresponding to strings (and other stuff, if I recall correctly):

<xarray.Dataset> Dimensions: (ICcheckNameLen: 72, ICcheckNum: 55, QCcheckNameLen: 60, QCcheckNum: 10, maxHomeWFOlen: 4, maxLDADmessageLen: 512, maxLDADtestLen: 51, maxNameLength: 51, maxProviderIdLen: 12, maxRemark: 80, maxSkyCover: 3, maxSkyLen: 8, maxStaIdLen: 6, maxStaTypeLen: 11, maxStaticIds: 5000, maxWeatherLen: 25, nInventoryBins: 24, recNum: 6277, totalIdLen: 24)

xarray here tries to multiple a MultiIndex for the DataFrame out of the outer product of all these dimensions. It would be nice to have a better fix here, but it's not immediately obvious to me what that would be.

 
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   MADIS netCDF to Pandas Dataframe: ValueError: iterator is too large 152040420

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