dotnet/machinelearning

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ML.NET is an open source and cross-platform machine learning framework for .NET.

Stars: 9.4k
Forks: 1.9k
Open beginner issues: 0
Indexed issues: 738
Avg merge: 2d 20h
Merged PRs (30d): 11

Dominant language: C#
License: MIT
Last GitHub push: Sep 11, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

Open All

737 open issues indexed

[Tokenizers] BpeOptions.ByteLevel=true silently drops spaces and newlines when PreTokenizer is not set Open

untriaged

Difficulty 3/5 1-2 days Newbie friendliness 74/100

dotnet/machinelearning#7715 · 1 comment · Opened Sep 14, 2026
CI failed to access NuGet feeds because of rate limiting Open

area-Infrastructure blocking-clean-ci Known Build Error untriaged

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

dotnet/machinelearning#7707 · 1 comment · Opened Sep 10, 2026
Flaky test LLaMA3_1Tests.Llama_3_1_405b_ShapeTest Open

blocking-clean-ci Known Build Error untriaged

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

dotnet/machinelearning#7706 · 1 comment · Opened Sep 10, 2026
Add self-supervised time-series representation learning Open

enhancement untriaged

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

dotnet/machinelearning#7700 · 1 comment · Opened Sep 9, 2026
Fix and re-enable skipped and flaky tests Open

area-Infrastructure untriaged

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

dotnet/machinelearning#7698 · 1 comment · Opened Sep 8, 2026
Add automatic area labeling Open

agentic-workflows area-Infrastructure enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/machinelearning#7691 · 1 comment · Opened Sep 3, 2026
Add .NET 10 to the CI test matrix Open

area-Infrastructure test-enhancement

Difficulty 3/5 1-2 days Newbie friendliness 72/100

dotnet/machinelearning#7690 · 1 comment · Opened Sep 3, 2026
Update outdated CI build images and containers Open

area-Infrastructure

Difficulty 4/5 3-5 days Newbie friendliness 48/100

dotnet/machinelearning#7689 · 1 comment · Opened Sep 3, 2026
Add Windows ARM baseline coverage for SymSGD predictor test Open

area-Native test-enhancement

Difficulty 3/5 1-2 days Newbie friendliness 68/100

dotnet/machinelearning#7688 · 1 comment · Opened Sep 2, 2026
Review and document ONNX testing coverage Open

area-ONNX test-enhancement

Difficulty 4/5 3-5 days Newbie friendliness 50/100

dotnet/machinelearning#7687 · 1 comment · Opened Sep 2, 2026
Support native ARM64 in Microsoft.ML.LightGbm Open

area-Native enhancement

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

dotnet/machinelearning#7685 · 1 comment · 1 reaction · Opened Sep 1, 2026
Reduce steady-state allocations in inference and training hot paths Open

area-Core tenet-performance

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

dotnet/machinelearning#7684 · 2 comments · Opened Sep 1, 2026
Update ONNX export to ONNX 1.22 opsets Open

area-ONNX

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

dotnet/machinelearning#7683 · 2 comments · Opened Sep 1, 2026
Improve ONNX inference performance by adopting the OrtValue API Open

area-ONNX tenet-performance

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

dotnet/machinelearning#7682 · 1 comment · Opened Sep 1, 2026
Tokenizers: read the tokenizer.json 'decoder' section in CreateFromTokenizerJson Open

area-Tokenizers enhancement untriaged

Difficulty 4/5 3-5 days Newbie friendliness 48/100

dotnet/machinelearning#7660 · 1 comment · Opened Jul 16, 2026
Add Quantile Regression support to LightGbmRegressionTrainer Open

area-Trees enhancement untriaged

Difficulty 4/5 3-5 days Newbie friendliness 65/100

dotnet/machinelearning#7603 · 1 comment · 7 reactions · Opened Apr 14, 2026
Update Windows Server 2019 VM images — end of mainstream support Open

area-Infrastructure

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

dotnet/machinelearning#7596 · 2 comments · Opened Mar 18, 2026
TreeEnsembleRegressor is deprecated in ONNX Open

area-ONNX

Difficulty 3/5 1-2 days Newbie friendliness 50/100

dotnet/machinelearning#7581 · 1 comment · Opened Feb 17, 2026
erfInv is very inneficient Open

area-Native untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

dotnet/machinelearning#7568 · Opened Jan 15, 2026
Updated roadmap? Open

area-Meta untriaged

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

dotnet/machinelearning#7547 · 2 comments · 11 reactions · Opened Nov 8, 2025
Cross-Platform ML.NET Model Builder Extension for Visual Studio Code Open

area-AutoML enhancement untriaged

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

dotnet/machinelearning#7545 · Opened Nov 7, 2025
FeaturizeText: System.ArgumentOutOfRangeException: Schema mismatch for input column 'Text_CharExtractor': expected Expected known-size vector of Single, got Vector<Single> Open

area-Transforms untriaged

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

dotnet/machinelearning#7529 · Opened Oct 24, 2025
ML.NET LightGBM linear-tree Open

area-Trees enhancement untriaged

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

dotnet/machinelearning#7527 · Opened Oct 16, 2025
text tokenizer EncodeToTokens repeat Open

area-Tokenizers untriaged

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

dotnet/machinelearning#7523 · 2 comments · Opened Oct 11, 2025
MulticlassClassificationExperiment preFeaturizer not acting on the schema Open

area-AutoML untriaged

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

dotnet/machinelearning#7522 · Opened Oct 7, 2025
Support 16 KB page sizes Open

area-Native enhancement needs-author-action

dotnet/machinelearning#7517 · 7 comments · 1 reaction · 1 assignee · Opened Oct 3, 2025
Proposal: Pluggable RNG in MLContext (enable deterministic, portable RNGs like MT19937) Open

area-Core enhancement untriaged

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

dotnet/machinelearning#7502 · Opened Sep 13, 2025
dotnet/machine learning should allow localizing exception messages Open

area-Core enhancement untriaged

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/machinelearning#7490 · Opened Aug 4, 2025
New Text Classification Model on ARM Fails to Train Open

area-TorchSharp untriaged

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

dotnet/machinelearning#7488 · 3 comments · Opened Jul 13, 2025
Quo vadis for ml.net? Open

area-Meta untriaged

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

dotnet/machinelearning#7487 · 1 comment · Opened Jul 11, 2025
KMeansTrainer.Options NumberOfThreads has no effect? Low CPU load during .Fit() Open

area-Trainers untriaged

Difficulty 4/5 3-5 days Newbie friendliness 45/100

dotnet/machinelearning#7477 · 1 comment · Opened Jun 11, 2025
AutoML.SourceGenerator needs to convert to incremental source generator Open

area-AutoML untriaged

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

dotnet/machinelearning#7468 · Opened May 19, 2025
Build instructions: CMake < 4.0 and spectre-mitigation Open

area-Infrastructure untriaged

dotnet/machinelearning#7467 · 1 reaction · 1 assignee · Opened May 17, 2025
When an object detection model created with ML.net Model builder is run on Maui (iOS), the model fails to load. Open

area-TorchSharp untriaged

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

dotnet/machinelearning#7460 · 1 comment · Opened May 7, 2025
DOCS: LightGbm in Linux Container (System.DllNotFoundException: Unable to load shared library 'lib_lightgbm' or one of its dependencies.) Open

area-Trees untriaged

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

dotnet/machinelearning#7454 · 1 comment · Opened May 2, 2025
Add docs (tutorial) about transfer image from RAM to pipeline (model) Open

area-Vision documentation enhancement help wanted

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

dotnet/machinelearning#7449 · 2 comments · Opened Apr 26, 2025
Legacy images need to be updated Open

area-Infrastructure Priority:1

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

dotnet/machinelearning#7447 · 3 comments · Opened Apr 24, 2025
MLImage disposes in some cases after CreateEnumerable .ToArray() if there is ResizeImages in the pipeline Open

area-Vision

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

dotnet/machinelearning#7444 · Opened Apr 14, 2025
Expose all LightGbm Metrics Open

area-Trees enhancement needs-further-triage untriaged

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

dotnet/machinelearning#7438 · 5 comments · Opened Apr 7, 2025
FastTreeRegressionTrainer leaves memory allocation happens before actually yes knowing how many leaves are actually yes needed by the model Open

area-Trees untriaged

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

dotnet/machinelearning#7435 · Opened Apr 6, 2025
Better display of DataFrame in IEnumerable Visualizer Open

area-DataFrame enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

dotnet/machinelearning#7420 · 2 comments · Opened Mar 12, 2025
TestAppendMany_SizeMoreThanMaxBufferCapacity triggers OOM killer Open

area-DataFrame blocking-clean-ci Known Build Error

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

dotnet/machinelearning#7419 · 1 comment · Opened Mar 12, 2025
AutoMLExperiment_return_current_best_trial_when_ct_is_canceled_with_trial_completed_Async fails in CI Open

area-AutoML blocking-clean-ci Known Build Error

Difficulty 3/5 1-2 days Newbie friendliness 30/100

dotnet/machinelearning#7418 · Opened Mar 12, 2025
Code coverage build fails to instrument file in use Open

area-Infrastructure blocking-clean-ci Known Build Error

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

dotnet/machinelearning#7417 · 2 comments · Opened Mar 12, 2025
Change FastForest Binary To Actually Really Have a Probability Column Open

area-Trees documentation

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

dotnet/machinelearning#7398 · 7 comments · Opened Feb 24, 2025
Resource contention in tests DownloadImageSet Open

area-Infrastructure blocking-clean-ci Known Build Error

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

dotnet/machinelearning#7393 · 2 comments · Opened Feb 20, 2025
Add max number of token to count to the TokenCount function Open

area-Tokenizers enhancement in-pr

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

dotnet/machinelearning#7391 · 1 comment · Opened Feb 19, 2025
Docs: HuggingFace (NLP) Migration Guide Open

area-Tokenizers documentation

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

dotnet/machinelearning#7384 · 3 comments · 2 reactions · Opened Feb 11, 2025
.NET AI Fundamentals Feedback / Feature Requests Open

area-Tokenizers enhancement untriaged

dotnet/machinelearning#7383 · 1 comment · 1 reaction · 1 assignee · Opened Feb 11, 2025
cloning is incorrectly implemented Open

area-DataFrame

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

dotnet/machinelearning#7381 · 1 comment · Opened Feb 6, 2025

dotnet/machinelearning

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