通过

LearningModelBinding 类

  • 参考

定义

命名空间:
Windows.AI.MachineLearning
编辑

用于将值绑定到命名输入和输出功能。

public ref class LearningModelBinding sealed : IIterable<IKeyValuePair<Platform::String ^, Platform::Object ^> ^>, IMapView<Platform::String ^, Platform::Object ^>
/// [Windows.Foundation.Metadata.Activatable(Windows.AI.MachineLearning.ILearningModelBindingFactory, 65536, "Windows.AI.MachineLearning.MachineLearningContract")]
/// [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 LearningModelBinding final : IIterable<IKeyValuePair<winrt::hstring, IInspectable const&>>, IMapView<winrt::hstring, IInspectable const&>
[Windows.Foundation.Metadata.Activatable(typeof(Windows.AI.MachineLearning.ILearningModelBindingFactory), 65536, "Windows.AI.MachineLearning.MachineLearningContract")]
[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 LearningModelBinding : IEnumerable<KeyValuePair<string,object>>, IReadOnlyDictionary<string,object>
function LearningModelBinding(session)
Public NotInheritable Class LearningModelBinding
Implements IEnumerable(Of KeyValuePair(Of String, Object)), IReadOnlyDictionary(Of String, Object)
继承
Object Platform::Object IInspectable LearningModelBinding
属性
ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute
实现
IIterable<IKeyValuePair<K,V>> IEnumerable<KeyValuePair<K,V>> IIterable<IKeyValuePair<String,Object>> IEnumerable<KeyValuePair<String,Object>> IIterable<IKeyValuePair<Platform::String,Platform::Object>> IIterable<IKeyValuePair<winrt::hstring,IInspectable>> IMapView<String,Object> IReadOnlyDictionary<String,Object> IMapView<Platform::String,Platform::Object> IMapView<winrt::hstring,IInspectable>

Windows 要求

设备系列
Windows 10, version 1809 (在 10.0.17763.0 中引入)
API contract
Windows.AI.MachineLearning.MachineLearningContract (在 v1.0 中引入)

示例

以下示例检索第一个输入和输出特征，创建输出帧，绑定输入和输出特征，并规避。

private async Task EvaluateModelAsync(
    VideoFrame _inputFrame, 
    LearningModelSession _session, 
    IReadOnlyList<ILearningModelFeatureDescriptor> _inputFeatures, 
    IReadOnlyList<ILearningModelFeatureDescriptor> _outputFeatures,
    LearningModel _model)
{
    ImageFeatureDescriptor _inputImageDescription;
    TensorFeatureDescriptor _outputImageDescription;
    LearningModelBinding _binding = null;
    VideoFrame _outputFrame = null;

    try
    {
        // Retrieve the first input feature which is an image
        _inputImageDescription =
                        _inputFeatures.FirstOrDefault(feature => feature.Kind == LearningModelFeatureKind.Image)
                        as ImageFeatureDescriptor;

        // Retrieve the first output feature which is a tensor
        _outputImageDescription =
                        _outputFeatures.FirstOrDefault(feature => feature.Kind == LearningModelFeatureKind.Tensor)
                        as TensorFeatureDescriptor;

        // Create output frame based on expected image width and height
        _outputFrame = new VideoFrame(
            BitmapPixelFormat.Bgra8, 
            (int)_inputImageDescription.Width, 
            (int)_inputImageDescription.Height);

        // Create binding and then bind input/output features
        _binding = new LearningModelBinding(_session);

        _binding.Bind(_inputImageDescription.Name, _inputFrame);
        _binding.Bind(_outputImageDescription.Name, _outputFrame);

        // Evaluate and get the results
        var results = await _session.EvaluateAsync(_binding, "test");
    }
    catch (Exception ex)
    {
        StatusBlock.Text = $"error: {ex.Message}";
        _model = null;
    }
}

注解

模型使用唯一的字符串名称指定其输入和输出功能。 在评估模型之前，可以使用这些名称将输入和输出绑定到会话。 为此，请使用 LearningModelBinding 对象，你可以基于会话创建该对象。

Windows Server

若要在 Windows Server 上使用此 API，必须使用具有桌面体验的 Windows Server 2019。

线程安全

此 API 是线程安全的。

构造函数

LearningModelBinding(LearningModelSession)

从指定的 LearningModelSession 创建 LearningModelBinding。

属性

Size

获取映射中的元素数。

方法

Bind(String, Object)

将值绑定到命名特征。
Bind(String, Object, IPropertySet)

使用属性将值绑定到命名功能以控制绑定。
Clear()

删除所有绑定。
First()

返回初始化为映射视图中第一个元素的迭代器。
HasKey(String)

确定地图视图是否包含指定的键。
Lookup(String)

返回地图视图中指定键处的项。
Split(IMapView<String,Object>, IMapView<String,Object>)

将地图视图拆分为两个视图。

适用于

另请参阅