Comments (6)
phofl
commented on July 22, 2024
Groupby doesn't support nunique approx, you can call nunique directly. Can you elaborate a bit why that isn't sufficient?
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LeilaGold
commented on July 22, 2024
I have a massive dataset. My colleagues and I have tried different ways to elaborate, but we always face the memory error. So we decided to use 'nunique_approx' to reduce the burden on the memory and it turned out that it not supported by Group by.
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phofl
commented on July 22, 2024
What Dask version are you on? We need more information to give advice here.
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LeilaGold
commented on July 22, 2024
dask 2024.5.1
dask-core 2023.9.2
dask-expr 1.1.1
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phofl
commented on July 22, 2024
And where is Dask blowing up memory? Normally, we trigger a shuffle for nunique that will make sure that the partition count doesn't change, i.e. we should not allocate to much memory on a single worker.
Can you provide a reproducer that doesn't do what you are trying to do?
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