Class OnnxSessionFactory

Namespace

VisioForge.Core.AI

Assembly

VisioForge.Core.AI.dll

Builds Microsoft.ML.OnnxRuntime.SessionOptions with the same execution-provider selection and bundled-native preload logic used by VisioForge.Core.AI.OnnxInferenceEngine, for engines that own their own Microsoft.ML.OnnxRuntime.InferenceSession instances rather than going through that class.

public static class OnnxSessionFactory

Inheritance

object

OnnxSessionFactory

Inherited Members

object.Equals(object?)

object.Equals(object?, object?)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object?, object?)

object.ToString()

Remarks

Those engines cannot share VisioForge.Core.AI.OnnxInferenceEngine directly because each uses a different preprocessing path and its own input shapes — the multi-stage OCR pipeline (ImageNet normalization for the detector, midgray-padded crops for the recognizer, one session per stage), and the open-vocabulary detector (a multi-input image + text session). They still want the hard-won provider selection (Auto resolves to the best provider actually compiled into the loaded native build) and the Windows DirectML preload, so that logic lives here and is reused by all of them.

Methods

CreateSessionOptions(OnnxExecutionProvider, int, BaseContext, out OnnxExecutionProvider)

Creates session options configured with the requested execution provider (CPU fallback always appended) and extended graph optimization. Best-effort: an unavailable hardware provider falls back to CPU with a warning.

public static SessionOptions CreateSessionOptions(OnnxExecutionProvider provider, int deviceId, BaseContext context, out OnnxExecutionProvider activeProvider)

Parameters

provider OnnxExecutionProvider

The requested execution provider; VisioForge.Core.Types.X.AI.OnnxExecutionProvider.Auto resolves to the fastest available.

deviceId int

The hardware device id for CUDA / DirectML.

context BaseContext

Optional logging context.

activeProvider OnnxExecutionProvider

Receives the provider that was actually engaged.

Returns

SessionOptions

The configured Microsoft.ML.OnnxRuntime.SessionOptions. The caller owns and must dispose it.

ResolveAutoProvider()

Picks the fastest execution provider present in the loaded native build (CUDA, then DirectML, then CoreML, finally CPU) — that is, what VisioForge.Core.Types.X.AI.OnnxExecutionProvider.Auto resolves to. Public so an engine can inspect the choice before paying for it: a model whose graph the provider would fragment into hundreds of partitions is better off on CPU, and only the engine knows that.

public static OnnxExecutionProvider ResolveAutoProvider()

Returns

OnnxExecutionProvider

The best available execution provider.