NullReferenceException when loading ONNX LSTM using Inference Engine

AI & Machine Learning AI Inference Engine
, ,
1

I’m getting NullReferenceException: Object reference not set to an instance of an object when importing a simple LSTM model created in PyTorch and exported to ONNX. Full trace:


NullReferenceException: Object reference not set to an instance of an object

Unity.InferenceEngine.Compiler.Passes.Optimization.FuseConstantsPass.FuseConstants (Unity.InferenceEngine.Model& model) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Runtime/Core/Compiler/Passes/FuseConstantsPass.cs:59)

Unity.InferenceEngine.Compiler.Passes.Optimization.FuseConstantsPass.Run (Unity.InferenceEngine.Model& model) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Runtime/Core/Compiler/Passes/FuseConstantsPass.cs:11)

Unity.InferenceEngine.ModelOptimizer.RunPasses (Unity.InferenceEngine.Model& model, Unity.InferenceEngine.Compiler.Passes.IModelPass[] passes) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Runtime/Core/Backends/ModelOptimizer.cs:18)

Unity.InferenceEngine.ModelOptimizer.OptimizeModel (Unity.InferenceEngine.Model& model) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Runtime/Core/Backends/ModelOptimizer.cs:45)

Unity.InferenceEngine.ONNX.Editor.ONNXModelConverter.ConvertOnnxModel (Onnx.ModelProto onnxModel) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Editor/ONNX/ONNXModelConverter.cs:1539)

Unity.InferenceEngine.ONNX.Editor.ONNXModelConverter.Convert () (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Editor/ONNX/ONNXModelConverter.cs:49)

Unity.InferenceEngine.ONNXModelImporter.OnImportAsset (UnityEditor.AssetImporters.AssetImportContext ctx) (at ./Library/PackageCache/com.unity.ai.inference@3d3e6e2da218/Editor/ONNX/ONNXModelImporter.cs:76)

UnityEditor.AssetImporters.ScriptedImporter.GenerateAssetData (UnityEditor.AssetImporters.AssetImportContext ctx) (at /Users/bokken/build/output/unity/unity/Modules/AssetPipelineEditor/Public/ScriptedImporter.cs:25)

Unity version: 6000.0.621f

Inference Engine version: 2.2.2

I can paste out a description of all the layers if desired but it’s nothing fancy, the model definition just contains LSTM and FC layers with no logic whatsoever. Attached is the model.

2

this issue is fixed in the latest verson 2.5.0.