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  • Canonical approach for new vectorized functions · 4 ✖
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592913599 https://github.com/pydata/xarray/issues/1992#issuecomment-592913599 https://api.github.com/repos/pydata/xarray/issues/1992 MDEyOklzc3VlQ29tbWVudDU5MjkxMzU5OQ== max-sixty 5635139 2020-02-29T07:22:00Z 2020-02-29T07:22:00Z MEMBER

We made some decent progress with numbagg!

 
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   Canonical approach for new vectorized functions 305663416
592909477 https://github.com/pydata/xarray/issues/1992#issuecomment-592909477 https://api.github.com/repos/pydata/xarray/issues/1992 MDEyOklzc3VlQ29tbWVudDU5MjkwOTQ3Nw== stale[bot] 26384082 2020-02-29T06:43:03Z 2020-02-29T06:43:03Z NONE

In order to maintain a list of currently relevant issues, we mark issues as stale after a period of inactivity

If this issue remains relevant, please comment here or remove the stale label; otherwise it will be marked as closed automatically

 
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   Canonical approach for new vectorized functions 305663416
377669882 https://github.com/pydata/xarray/issues/1992#issuecomment-377669882 https://api.github.com/repos/pydata/xarray/issues/1992 MDEyOklzc3VlQ29tbWVudDM3NzY2OTg4Mg== max-sixty 5635139 2018-03-31T06:19:33Z 2018-03-31T06:19:33Z MEMBER 
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   Canonical approach for new vectorized functions 305663416
373511743 https://github.com/pydata/xarray/issues/1992#issuecomment-373511743 https://api.github.com/repos/pydata/xarray/issues/1992 MDEyOklzc3VlQ29tbWVudDM3MzUxMTc0Mw== shoyer 1217238 2018-03-15T20:26:51Z 2018-03-15T20:26:51Z MEMBER

I started numbagg with the intent of using it for xarray, but never got around to finishing it up. I think it would be perfectly fine to add as an optional dependency. Mostly we are using bottleneck instead because it's already out there and is slightly more complete, but certainly writing new aggregation functions with numbagg rather than bottleneck would be much easier.

One thing I was also excited about doing with numbagg was writing fast grouped aggregation functions, e.g., to make xarray's groupby().mean() comparable in performance to pandas. I had some promising preliminary results, but now I can't find the notebook where I wrote them!

Out of curiosity, I ran the benchmark suite from the numbagg README again. Both Numba and bottleneck have been significantly improved over the past three years, but Numba now beats bottleneck across the board: ``` %timeit numbagg.nanmean(x) 1000 loops, best of 3: 1.92 ms per loop %timeit numbagg.nanmean(x, axis=0) 100 loops, best of 3: 2.75 ms per loop %timeit numbagg.nanmean(x, axis=1) 1000 loops, best of 3: 1.86 ms per loop

%timeit bottleneck.nanmean(x) 100 loops, best of 3: 2.75 ms per loop %timeit bottleneck.nanmean(x, axis=0) 100 loops, best of 3: 3.47 ms per loop %timeit bottleneck.nanmean(x, axis=1) 100 loops, best of 3: 2.72 ms per loop ```

 
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   Canonical approach for new vectorized functions 305663416

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