--- tags: [meeting, notes] --- *Attendees*: Isaac Virshup (@ivirshup), Jim Kitchen (@jim22k), Simon Cross (@hodgestar), Eric Gigure (@Ericgig) # Sparse interest meetup * Jim – at anaconda, working on python-graphblas * Eric– Sherbrooke QuTiP * Rewrote sparse operations because scipy was too slow * Simon Cross – QuTiP RIKEN * Implemented cython based sparse arrays within qutip * Problems with scipy sparse: * Sparse addition doing uneccesary copies * Inititalization and complex types * There are lots of checks making things slow * Downcasting indices/ indptr * Linear algebra and ODE use cases * Jim graph blas/ suite sparse * "sparse values" that aren't zero * suite sparse * Masked arrays * COO, CSR, and * MLIR graph blas * python-graphblas * Not Jit * Matrices must be 64 bit * On disk formats (degree of specialization) * Out of core needs? * Not doing a ton of this yet, but broad interest * Dask Graph blas from Eric Welch ### Links to projects * [AnnData](https://anndata.readthedocs.io/en/latest/) (ivirshup) * [qutip](https://qutip.org) * [python-graphblas](https://python-graphblas.readthedocs.io/en/latest/) ## Follow up * We will follow up on sparse on the discourse/ * TODO: Ask scientific python about where to discuss
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Isaac Virshup
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2023-06-12

Do we have everything we need to store all matrices in the SuiteSparse Matrix Collection?

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scverse governance meeting notes

review action items from last time

4/23/2024
scverse community meeting notes

scverse community meetings have an open agenda. Feel free to add any points you’d like to discuss ahead of or during the meeting! We usually start off with a ~5min flash talk about new ecosystem packages or other recent developments in the community. If you would liketo present at the meeting, please reach out to Gregor Sturm via the scverse Zulip.

4/16/2024
Sparse summit follow up meeting

Sort out and attribute what remains to be done

4/15/2024
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