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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
937264431 MDExOlB1bGxSZXF1ZXN0NjgzODQ5MjQ5 5577 Faster unstacking to sparse dcherian 2448579 closed 0     4 2021-07-05T17:20:59Z 2021-12-03T16:38:51Z 2021-12-03T16:38:49Z MEMBER   0 pydata/xarray/pulls/5577
  • [x] Tests added
  • [x] Passes pre-commit run --all-files
  • [x] User visible changes (including notable bug fixes) are documented in whats-new.rst

From 7s to 25 ms and 3.5GB to 850MB memory usage =) by passing the coordinate locations directly to the sparse constructor. ``` asv run -e --bench unstacking.UnstackingSparse.time_unstack_to_sparse --cpu-affinity=3 HEAD [ 0.00%] · For xarray commit c9251e1c <sparse-unstack>: [ 0.00%] ·· Building for conda-py3.8-bottleneck-dask-distributed-netcdf4-numpy-pandas-scipy-sparse [ 0.00%] ·· Benchmarking conda-py3.8-bottleneck-dask-distributed-netcdf4-numpy-pandas-scipy-sparse [ 0.01%] ··· Running (unstacking.UnstackingSparse.time_unstack_to_sparse_2d--).. [ 0.02%] ··· unstacking.UnstackingSparse.time_unstack_to_sparse_2d 623±30μs [ 0.02%] ··· unstacking.UnstackingSparse.time_unstack_to_sparse_3d 22.8±2ms [ 0.06%] ··· unstacking.UnstackingSparse.peakmem_unstack_to_sparse_2d 793M [ 0.06%] ··· unstacking.UnstackingSparse.peakmem_unstack_to_sparse_3d 794M

[ 0.04%] · For xarray commit 80905135 <main>: [ 0.04%] ·· Building for conda-py3.8-bottleneck-dask-distributed-netcdf4-numpy-pandas-scipy-sparse.. [ 0.04%] ·· Benchmarking conda-py3.8-bottleneck-dask-distributed-netcdf4-numpy-pandas-scipy-sparse [ 0.05%] ··· Running (unstacking.UnstackingSparse.time_unstack_to_sparse_2d--).. [ 0.06%] ··· unstacking.UnstackingSparse.time_unstack_to_sparse_2d 596±30ms [ 0.06%] ··· unstacking.UnstackingSparse.time_unstack_to_sparse_3d 7.72±0.1s [ 0.02%] ··· unstacking.UnstackingSparse.peakmem_unstack_to_sparse_2d 867M [ 0.02%] ··· unstacking.UnstackingSparse.peakmem_unstack_to_sparse_3d 3.56G ```

cc @bonnland

 
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     xarray 13221727 pull

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