Release notes

This page records updates to Windows ML in the latest builds of the Windows 10 SDK and NuGet Package.

Windows ML NuGet Package - Version 1.7

  • Download NuGet here
  • Built on ONNX Runtime 1.7
  • .NET5 support - will work with .NET5 Standard 2.0 Projections.
  • Image descriptors expose NominalPixelRange properties
  • Native support added for additional pixel ranges [0..1] and [-1..1] in image models.
  • A new property is added to the ImageFeatureDescriptor runtimeclass to expose the ImageNominalPixelRange property in ImageFeatureDescriptor. Other similar properties exposed are the image’s BitmapPixelFormat and BitmapAlphaMode.
  • Bug fixes and performance improvements.
  • DirectML PIX markers to Redist added to enable profiling graph at operator level.
  • Fixes applied to ensure the package correctly installs on C# UWP projects in Visual Studio.

Windows ML NuGet Package - Version 1.6

  • Download NuGet here
  • Built on ONNX Runtime 1.6
  • Support for UWP applications targeting Windows Store deployment for both CPU and GPU.
  • WindowsAI Redist now includes a statically linked C-Runtime package for additional deployment options.
  • Minor API Improvements: Users are now able to bind Iterable as inputs and outputs, and able to create Tensor* via multiple buffers.

Windows ML NuGet Package - Version 1.5

  • Support for UWP applications targeting Windows Store deployment (CPU only).
  • Support for .NET and .NET framework applications.
  • Support for RUST Developers - sample and documentation available
  • New APIs to for additional performance control:
    • IntraopNumThreads: Provides an ability to change the number of threads used in the threadpool for Intra Operator Execution for CPU operators through LearningModelSessionOptions.
    • [SetNamedDimensionOverrides]((/native-apis/ Provides the ability to override named input dimensions to concrete values through LearningModelSessionOptions in order to achieve better runtime performance.
  • Support for additional ONNX format image type denotations – Gray8, normalized [0..1] and normalized [-1..1].
  • Reduced package size by separating debug symbols into separate distribution package.

Windows ML NuGet Package – Version 1.4

Windows ML NuGet Package - Version 1.3

  • Download NuGet here
  • Built on ONNX Runtime 1.3
  • Corresponds to MachineLearningContract v3.
  • Support for ONNX 1.6 and opset 11.
  • CPU execution supported down to Windows 8.1; GPU execution supported down to Windows 10 version 1709.
  • Certified known tested paths are Desktop Applications using C++. Store applications and the Windows Application Certification Kit are not yet supported.

Build 19041 (Windows 10, version 2004)

Support for ONNX 1.4 and opset 9 (CPU and GPU)

API Surface additions:


  • WinMLTools converters supports new ONNX versions and opset
  • Optimizations to WinMLRunner exposing new performance metrics

Build 18362 (Windows 10, version 1903)

All features and updates from previous flighted builds:

Build 18829

Build 18290

  • Min supported ONNX version = 1.2.2 (opset 7)
  • Max supported ONNX version = 1.3 (opset 8)
  • Supports model size reduction via post-training weight quantization. You can use the latest version of WinMLTools to pack the weights of your model down to int8.

Build 17763 (Windows 10, version 1809)

Known issues

  • For models containing sequences, MLGen generates an IList<Dictionary<key, value>> instead of the proper IList<IDictionary<key, value>>, leading to empty results. To fix this issue, simply replace the automatically generated code with the appropriate IList<IDictionary<key, value>> instead.

Build 17723


Use the following resources for help with Windows ML:

  • To ask or answer technical questions about Windows ML, please use the windows-machine-learning tag on Stack Overflow.
  • To report a bug, please file an issue on our GitHub.
  • To request a feature, please head over to Windows Developer Feedback.