LearningModel Class

Reference

Definition

Namespace:: Windows.AI.MachineLearning

Important

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Edit

Represents a trained machine learning model.

public ref class LearningModel sealed : IClosable

/// [Windows.Foundation.Metadata.ContractVersion(Windows.AI.MachineLearning.MachineLearningContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class LearningModel final : IClosable

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.AI.MachineLearning.MachineLearningContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class LearningModel : System.IDisposable

Public NotInheritable Class LearningModel
Implements IDisposable

Inheritance: Object Platform::Object IInspectable LearningModel

Attributes: ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Implements: IClosable IDisposable

Windows requirements

Device family	Windows 10, version 1809 (introduced in 10.0.17763.0)
API contract	Windows.AI.MachineLearning.MachineLearningContract (introduced in v1.0)

Examples

The following example loads a model and creates an evaluation session with it.

private async Task LoadModelAsync(string _modelFileName)
{
    LearningModel _model;
    LearningModelSession _session;

    try
    {
        // Load and create the model
        var modelFile = 
            await StorageFile.GetFileFromApplicationUriAsync(new Uri($"ms-appx:///Assets/{_modelFileName}"));
        _model = await LearningModel.LoadFromStorageFileAsync(modelFile);

        // Create the evaluation session with the model
        _session = new LearningModelSession(_model);

    }
    catch (Exception ex)
    {
        StatusBlock.Text = $"error: {ex.Message}";
        _model = null;
    }
}

Remarks

This is the main object you use to interact with Windows ML. You use it to load, bind, and evaluate trained ONNX models:

Load the model using one of the Load* constructors.
Enumerate the InputFeatures and OutputFeatures and bind to your model.
Create a LearningModelSession and evalaute.

Windows Server

To use this API on Windows Server, you must use Windows Server 2019 with Desktop Experience.

Thread safety

This API is thread-safe.

Properties

Author	The name of the model author.
Description	A description of the model.
Domain	The domain of the model.
InputFeatures	A list of the model's input features.
Metadata	The raw <string,string> metadata from the ONNX model.
Name	The name of the model.
OutputFeatures	A list of the model's output features.
Version	The version of the model.

Methods

Close()	Releases the in-memory ONNX model. After calling this, you cannot create any more LearningModelSession objects.
Dispose()	Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
LoadFromFilePath(String, ILearningModelOperatorProvider)	Loads an ONNX model from a file on disk.
LoadFromFilePath(String)	Loads an ONNX model from a file on disk.
LoadFromStorageFileAsync(IStorageFile, ILearningModelOperatorProvider)	Loads an ONNX model from an IStorageFile asynchronously.
LoadFromStorageFileAsync(IStorageFile)	Loads an ONNX model from an IStorageFile asynchronously.
LoadFromStream(IRandomAccessStreamReference, ILearningModelOperatorProvider)	Loads an ONNX model from a stream.
LoadFromStream(IRandomAccessStreamReference)	Loads an ONNX model from a stream.
LoadFromStreamAsync(IRandomAccessStreamReference, ILearningModelOperatorProvider)	Loads an ONNX model from a stream asynchronously.
LoadFromStreamAsync(IRandomAccessStreamReference)	Loads an ONNX model from a stream asynchronously.

Applies to

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