SciSharp/NumSharp

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High Performance Computation for N-D Tensors in .NET, similar API to NumPy.

Stars: 1.5k
Forks: 205
Open beginner issues: 0
Indexed issues: 55
Avg merge: 7d 7h
Merged PRs (30d): 2

Dominant language: C#
License: Apache-2.0
Last GitHub push: Sep 10, 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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55 open issues indexed

[OpenBLAS] Port the LAPACK factorisations to a native managed C# backend Open

architecture enhancement NumPy 2.x Compliance

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

SciSharp/NumSharp#627 · Opened Aug 14, 2026
[NumPy Parity] Neural Networks Project to fully train byte-identical weights on training Open

api bug core NumPy 2.x Compliance

SciSharp/NumSharp#626 · 1 assignee · Opened Jul 25, 2026
Intermittent AccessViolation (unmanaged-storage lifetime race) — shift/bitwise kernel is the victim, not the cause Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

SciSharp/NumSharp#615 · Opened Jun 29, 2026
[Performance] SIMD Vector512 Coverage Gaps Open

core enhancement performance

Difficulty 5/5 Over a week Newbie friendliness 38/100

SciSharp/NumSharp#614 · Opened Jun 26, 2026
[Performance] ClipNDArray with @out does redundant copy Open

api performance

SciSharp/NumSharp#595 · 1 assignee · Opened Mar 23, 2026
[Core] NumPy String support in NumSharp Open

api core enhancement missing feature/s NumPy 2.x Compliance

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

SciSharp/NumSharp#592 · 2 comments · Opened Mar 18, 2026
[Goal] LinearRegression: Near-Identical Python→C# Translation Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 40/100

SciSharp/NumSharp#580 · Opened Feb 21, 2026
Performance: Replace heap allocations with stackalloc in 74+ hot paths Open

core performance

SciSharp/NumSharp#575 · 2 comments · 1 assignee · Opened Feb 21, 2026
[Types] Add timedelta64 support Open

core documentation-needed enhancement missing feature/s

SciSharp/NumSharp#571 · 1 assignee · Opened Feb 14, 2026
[Types] Add datetime64 support Open

core documentation-needed enhancement missing feature/s

SciSharp/NumSharp#570 · 1 assignee · Opened Feb 14, 2026
[Types] Add complex64 support Open

core documentation-needed enhancement missing feature/s

SciSharp/NumSharp#569 · 1 assignee · Opened Feb 14, 2026
[Array API Standard] Cross-Platform Array Library Compatibility Open

api architecture enhancement NumPy 2.x Compliance

SciSharp/NumSharp#560 · 1 comment · 1 assignee · Opened Feb 13, 2026
[NEP32 NEP34] API Cleanup and Behavioral Changes Open

api documentation-needed enhancement NumPy 2.x Compliance

SciSharp/NumSharp#555 · 1 assignee · Opened Feb 13, 2026
[NEP07] DateTime and Timedelta Types Open

documentation-needed enhancement missing feature/s NumPy 2.x Compliance

SciSharp/NumSharp#554 · 1 assignee · Opened Feb 13, 2026
[NEP05 NEP20] Generalized Universal Functions Open

core documentation-needed enhancement NumPy 2.x Compliance

SciSharp/NumSharp#551 · 1 assignee · Opened Feb 13, 2026
[NEP27 NEP51] Scalar and Zero-Rank Array Handling Open

core documentation-needed enhancement NumPy 2.x Compliance

SciSharp/NumSharp#550 · 1 assignee · Opened Feb 13, 2026
[NEP42 NEP43 NEP55] DType System and String Support Open

architecture core documentation-needed enhancement NumPy 2.x Compliance

SciSharp/NumSharp#549 · 1 assignee · Opened Feb 13, 2026
[NEP10 NEP38 NEP54] SIMD and Iterator Performance Open

architecture core enhancement NumPy 2.x Compliance performance

SciSharp/NumSharp#548 · 1 assignee · Opened Feb 13, 2026
[NEP50 NEP52 NEP56] NumPy 2.0 Breaking Changes Open

api documentation-needed enhancement NumPy 2.x Compliance

SciSharp/NumSharp#547 · 1 assignee · Opened Feb 13, 2026
[Goal] Support Andrej Karpathy's microgpt.py Open

enhancement help wanted

SciSharp/NumSharp#540 · 1 comment · 1 assignee · Opened Feb 13, 2026
[NEP50 Core] Type promotion diverges from NumPy 2.x NEP 50 for unsigned int array + signed int scalar Open

bug core NumPy 2.x Compliance

SciSharp/NumSharp#529 · 2 comments · 1 assignee · Opened Feb 8, 2026
Very helpful work. Keep at it Open

Difficulty 5/5 Over a week Newbie friendliness 10/100

SciSharp/NumSharp#516 · 1 comment · 2 reactions · Opened Aug 13, 2024
how to change to Microsoft.ML.OnnxRuntime.Tensors.DenseTensor<float>? Open

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

SciSharp/NumSharp#512 · Opened Apr 1, 2024
Does Numsharp work in Unity with the IL2CPP backend? Open

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

SciSharp/NumSharp#511 · Opened Mar 27, 2024
Possible typo "ToMuliDimArray()" Open

Difficulty 1/5 Under an hour Newbie friendliness 35/100

SciSharp/NumSharp#499 · 1 comment · Opened Aug 30, 2023
Is there an example on how to use it with IronPython? Open

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

SciSharp/NumSharp#498 · Opened Aug 22, 2023
ToBitmap() - datatype mistmatch Open

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

SciSharp/NumSharp#491 · Opened Mar 8, 2023
np.random.choice with replace: false produces duplicates Open

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

SciSharp/NumSharp#490 · Opened Mar 6, 2023
大佬，能否用C#还原 java 的一个求解器 optaplanner Open

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

SciSharp/NumSharp#482 · Opened Dec 7, 2022
Lacking/Outdated Documentation Open

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

SciSharp/NumSharp#479 · 1 comment · Opened Aug 16, 2022
ToBitmap fails if not contiguous because of Broadcast mismatch Open

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

SciSharp/NumSharp#475 · Opened Feb 9, 2022
How to use the repo to convert some Python code? Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

SciSharp/NumSharp#462 · 1 comment · Opened Sep 21, 2021
NumSharp does not allow building with IL2CPP via Unity Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

SciSharp/NumSharp#455 · 1 comment · Opened Jul 27, 2021
Debug.Assert(...) causes tests to stop the entire process Open

bug infrastructure

SciSharp/NumSharp#448 · 3 comments · 1 assignee · Opened Apr 23, 2021
NDArray.ToBitmap() has critical issue with 24bpp VERTICAL images Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

SciSharp/NumSharp#440 · Opened Feb 9, 2021
NDArray exists in both NumSharp.Core, Version=0.20.5.0 and NumSharp.Lite, Version=0.1.9.0 Open

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

SciSharp/NumSharp#433 · 3 comments · Opened Dec 9, 2020
NumSharp.Backends.Unmanaged.UnmanagedMemoryBlock`1 fails on Mono on Linux Open

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

SciSharp/NumSharp#430 · Opened Nov 15, 2020
Typo in NDArray.ToMuliArray method name Open

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

SciSharp/NumSharp#428 · Opened Nov 11, 2020
The type or namespace name 'NumSharp' could not be found (are you missing a using directive or an assembly reference?) [Assembly-CSharp]csharp(CS0246) Open

Difficulty 3/5 1-2 days Newbie friendliness 20/100

SciSharp/NumSharp#424 · 2 comments · Opened Oct 15, 2020
help me Open

SciSharp/NumSharp#418 · 1 assignee · Opened Aug 1, 2020
The type 'NDArray' exists in both 'NumSharp.Core, Version=0.20.5.0, ' and 'NumSharp.Lite, Version=0.1.7.0, Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

SciSharp/NumSharp#412 · Opened May 27, 2020
C# --> convert image to NDarray Open

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

SciSharp/NumSharp#406 · 1 comment · Opened Apr 20, 2020
Bitmap.ToNDArray problem with odd bitmap width Open

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

SciSharp/NumSharp#396 · 2 comments · Opened Feb 6, 2020
Save NDArray as png image Open

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

SciSharp/NumSharp#384 · 1 comment · Opened Jan 12, 2020
Clustering Example Open

help wanted missing feature/s

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

SciSharp/NumSharp#372 · 2 comments · Opened Dec 5, 2019
Scipy.Signal Open

missing feature/s

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

SciSharp/NumSharp#349 · 8 comments · Opened Sep 21, 2019
Built-in System.Drawing.Image and Bitmap methods Open

api documentation-needed enhancement

SciSharp/NumSharp#343 · 5 comments · 1 assignee · Opened Sep 1, 2019
NDArray string problem Open

missing feature/s

SciSharp/NumSharp#341 · 1 comment · 1 reaction · 1 assignee · Opened Aug 26, 2019
[Discussion] Ground Rules and Library Structure/Architecture Open

architecture further discuss

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

SciSharp/NumSharp#284 · 5 comments · Opened Jun 14, 2019
Compressed Sparse Format Open

enhancement

SciSharp/NumSharp#190 · 3 comments · 2 reactions · 1 assignee · Opened Jan 9, 2019

SciSharp/NumSharp

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