pydata/sparse

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Sparse multi-dimensional arrays for the PyData ecosystem

Stars: 668
Forks: 141
Open beginner issues: 0
Indexed issues: 64
Avg merge: 2d 8h
Merged PRs (30d): 4

Dominant language: Python
License: BSD-3-Clause
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted

Beginner friendly Everything

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64 open issues indexed

array API: missing `arange` Open

pydata/sparse#950 · 5 comments · 1 assignee · Opened Aug 12, 2026
Enh: Add Sparse+batched `squareform` Implementation Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 45/100

pydata/sparse#929 · 2 comments · Opened Mar 10, 2026
Doc: mention GCXS format on front-page Open

needs triage

Difficulty 1/5 1-3 hours Newbie friendliness 58/100

pydata/sparse#917 · 1 reaction · Opened Jan 27, 2026
Usage: Finch backend returns Julia-native dtypes like 'Julia: Float64.' Is this intentional? Open

usage

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#915 · 3 comments · 1 reaction · Opened Jan 20, 2026
Usage: Poor performance of NaN-aware xarray computations? Open

performance upstream

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#908 · 6 comments · Opened Nov 12, 2025
Enh: Request for the tensor Contraction with high order sparse tensor Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#897 · 3 comments · Opened Aug 15, 2025
Tracking issue for benchmarking improvements. Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

pydata/sparse#889 · Opened Jul 20, 2025
Doc: Show stats comparing to numpy Open

discussion documentation

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#879 · 7 comments · Opened Jun 28, 2025
Usage: confused by `np.where` behaviour and `fill_value` Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/sparse#871 · 4 comments · Opened May 15, 2025
Bug: Cannot use boolean GCXS array for indexing another GCXS array Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 38/100

pydata/sparse#860 · 1 comment · Opened Apr 9, 2025
DOC: `stable` documentation is stuck at 0.15.1; no changelog afterwards Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 35/100

pydata/sparse#840 · 3 comments · Opened Feb 5, 2025
Enh: Accept "duck arrays" for `tensordot` Open

enhancement needs triage

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/sparse#833 · 8 comments · Opened Jan 9, 2025
Investigate `complex` dtype failure. Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/sparse#818 · Opened Nov 27, 2024
Bug: unexpected error from COO.from_numpy when using idx_dtype kwarg Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 42/100

pydata/sparse#810 · 3 comments · Opened Nov 18, 2024
Support non-SoA singleton Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/sparse#804 · Opened Nov 6, 2024
Add back `reshape` and `broadcast_to` with format selection Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#796 · 5 comments · Opened Oct 22, 2024
Support Tensor views Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/sparse#786 · 1 comment · Opened Oct 2, 2024
Enh: Support for sparse nd-convolutions Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/sparse#762 · 1 comment · Opened Aug 29, 2024
Support sparse interchange format Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/sparse#753 · Opened Aug 19, 2024
Use `Finch-mlir` dialect instead of `sparse-tensor` for ops Open

pydata/sparse#752 · 1 assignee · Opened Aug 19, 2024
Implement basic ops for MLIR-based arrays with `sparse-tensor` dialect Open

pydata/sparse#751 · 1 assignee · Opened Aug 19, 2024
Add `codespell` to pre-commit Open

internal

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pydata/sparse#739 · Opened Aug 7, 2024
Include notebooks in documentation Open

pydata/sparse#710 · 6 comments · 1 assignee · Opened Jun 24, 2024
Faster matmul for case sparse.coo * np.ndarray Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/sparse#653 · 1 comment · Opened Mar 22, 2024
Segmentation fault on arm64 Open

upstream

Difficulty 4/5 3-5 days Newbie friendliness 38/100

pydata/sparse#628 · 12 comments · Opened Jan 14, 2024
Support for Fortran order in COO.flatten() Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/sparse#603 · 1 comment · Opened Jul 28, 2023
Support `arr.size >= 2 ** 64` as long as each dimension is `< 2 ** 64` Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/sparse#600 · 1 comment · Opened Jul 2, 2023
Support for 'at' ufunc method Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#548 · 3 comments · 1 reaction · Opened Apr 25, 2022
What does `compressed_axes = None` mean? Open

discussion

pydata/sparse#535 · 4 comments · 1 assignee · Opened Jan 6, 2022
Smart automatic dask wrapping Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#530 · 6 comments · Opened Nov 4, 2021
"Segmentation fault (core dumped)" after installing the required sparse library in a Qiskit env (conda virtual env) Open

upstream

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/sparse#522 · 14 comments · Opened Oct 19, 2021
Some dtypes not supported by numba Open

upstream

Difficulty 4/5 3-5 days Newbie friendliness 25/100

pydata/sparse#521 · 2 comments · Opened Oct 13, 2021
Inconsistent tocoo/to_coo methods on different sparse types Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#507 · 1 comment · Opened Aug 11, 2021
Inconsistent elemwise auto-densify rules Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#460 · 20 comments · Opened Apr 21, 2021
CSR/CSC Tracking issue Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/sparse#443 · 10 comments · Opened Mar 16, 2021
CSC/ CSR classes Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/sparse#433 · 6 comments · 3 reactions · Opened Feb 22, 2021
Support assignment of DOK to DOK subarray Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#400 · Opened Aug 22, 2020
GPU/Parallelism support Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/sparse#379 · 9 comments · Opened Jul 7, 2020
sparse and numba Open

support

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/sparse#378 · 14 comments · Opened Jul 2, 2020
Memory usage - coords waste Open

support

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#335 · 5 comments · Opened Apr 15, 2020
COO.transpose() is not cheap Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

pydata/sparse#329 · 3 comments · Opened Mar 3, 2020
Support boolean indexing with a COO sparse matrix Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 48/100

pydata/sparse#304 · 9 comments · Opened Nov 22, 2019
Evaluation of TACO compiler Open

discussion

Difficulty 5/5 Over a week Newbie friendliness 15/100

pydata/sparse#299 · 6 comments · Opened Nov 6, 2019
Support for DOK slicing and advanced indexing Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

pydata/sparse#298 · 9 comments · Opened Nov 6, 2019
API to change fill-value Open

support

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/sparse#297 · 7 comments · Opened Oct 29, 2019
Sparse Cholesky Decomposition Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

pydata/sparse#286 · 9 comments · Opened Sep 8, 2019
Dot product between ones and COO tensor Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

pydata/sparse#265 · 2 comments · Opened Aug 6, 2019
dtype: NotImplementedError: float16 Open

upstream

Difficulty 3/5 1-2 days Newbie friendliness 38/100

pydata/sparse#263 · 5 comments · Opened Jul 27, 2019
Allow uint32 dtype for coords Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

pydata/sparse#249 · 4 comments · 2 reactions · Opened Apr 15, 2019
A dense axis Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 20/100

pydata/sparse#227 · 11 comments · 2 reactions · Opened Jan 10, 2019

pydata/sparse

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