issue_comments: 522592263

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https://github.com/pydata/xarray/issues/659#issuecomment-522592263 https://api.github.com/repos/pydata/xarray/issues/659 522592263 MDEyOklzc3VlQ29tbWVudDUyMjU5MjI2Mw== 32069530 2019-08-19T14:09:36Z 2019-08-19T14:09:36Z NONE

I gave a look to functions such as "np.add.at" which can be highly faster than home-made solution. The aggregate function of the "numpy-groupies" package is even faster (25 x faster than np.add.at in my case). Maybe xarray groupby functionalities can rely on such effective package.

 
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