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ML.NET 0.6 Release Notes

Today we are excited to release ML.NET 0.6, the biggest release of ML.NET ever (or at least since 0.5)! This release unveils the first iteration of new ML.NET APIs. These APIs enable various new tasks that weren't possible with the old APIs. Furthermore, we have added a transform to get predictions from ONNX models, expanded functionality of the TensorFlow scoring transform, aligned various ML.NET types with .NET types, and more!

Installation

ML.NET supports Windows, MacOS, and Linux. See supported OS versions of .NET Core 2.0 for more details.

You can install ML.NET NuGet from the CLI using:

dotnet add package Microsoft.ML

From package manager:

Install-Package Microsoft.ML

Release Notes

Below are some of the highlights from this release.

  • New APIs for ML.NET

    • While the LearningPipeline APIs that were released with ML.NET 0.1 were easy to get started with, they had obvious limitations in functionality. Certain tasks that were possible with the internal version of ML.NET like inspecting model weights, creating a transform-only pipeline, and training from an initial predictor could not be done with LearningPipeline.
    • The important concepts for understanding the new API are introduced here.
    • A cookbook that shows how to use these APIs for a variety of existing and new scenarios can be found here.
    • These APIs are still evolving, so we would love to hear any feedback or questions.
    • The LearningPipeline APIs have moved to the Microsoft.ML.Legacy namespace.

  • Added a transform to score ONNX models (#942)

    • ONNX is an open model format that enables developers to more easily move models between different tools.
    • There are various collections of ONNX models that can be used for tasks like image classification, emotion recognition, and object detection.
    • The ONNX transform in ML.NET enables providing some data to an existing ONNX model (such as the models above) and getting the score (prediction) from it. Example usage can be found here.

  • Enhanced TensorFlow model scoring functionality (#853, #862)

    • The TensorFlow scoring transform released in ML.NET 0.5 enabled using 'frozen' TensorFlow models. In ML.NET 0.6, 'saved' TensorFlow models can also be used.
    • An API was added to extract information about the nodes in a TensorFlow model. This can help identifying the input and output of a TensorFlow model. Example usage can be found here.

  • Replaced ML.NET's Dv type system with .NET's standard type system (#863)

    • ML.NET previously had its own type system which helped it more efficiently deal with things like missing values (a common case in ML). This type system required users to work with types like DvText, DvBool, DvInt4, etc.
    • This update replaces the Dv type system with .NET's standard type system to make ML.NET easier to use and to take advantage of innovation in .NET.
    • One effect of this change is that only floats and doubles have missing values, represented by NaN. More information can be found here.

  • Up to ~100x speedup in prediction engine performance for single records (#973)

  • Improved approach to dependency injection enables ML.NET to be used in additional .NET app models without messy workarounds (e.g. Azure Functions) (#970, #1022)

Additional issues closed in this milestone can be found here.

Acknowledgements

Shoutout to feiyun0112, jwood803, adamsitnik, and the ML.NET team for their contributions as part of this release!