Reproduction steps:
1. Download "BodyPixOnnx.zip" ONNX models from here: [https://github.com/keijiro/NNCam/releases/tag/v0.0.1]
2. Import them to any Barracuda 1.3.0 project
3. Observe the errors. Models don't import

Reproduced with:
- Barracuda 1.3.0

Not reproducible with:
- Barracuda 1.2.1

Originaly reported:
* https://forum.unity.com/threads/barracuda-1-3-0-prev-cannot-import-bodypix-onnx-files.1049750/

Error messages:
Exception: Must have input shape for <...> in order to convert Reshape to NHWC
Unity.Barracuda.Compiler.Passes.NCHWToNHWCPass.<InstantiateRewriterNCHWToNHWC>b__2_0 (Unity.Barracuda.Layer layer, Unity.Barracuda.ModelBuilder net) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/Core/Compiler/Passes/NCHWToNHWC/RewriterNCHWToNHWC.cs:49)
Unity.Barracuda.Compiler.Passes.NCHWToNHWCPass.Rewrite (Unity.Barracuda.Model& model) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/Core/Compiler/Passes/NCHWToNHWCPass.cs:138)
Unity.Barracuda.Compiler.Passes.NCHWToNHWCPass.Run (Unity.Barracuda.Model& model) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/Core/Compiler/Passes/NCHWToNHWCPass.cs:33)
Unity.Barracuda.Compiler.Passes.IntermediateToRunnableNHWCPass.Run (Unity.Barracuda.Model& model) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/Core/Compiler/Passes/IntermediateToRunnableNHWCPass.cs:33)
Unity.Barracuda.ONNX.ONNXModelConverter.Convert (Google.Protobuf.CodedInputStream inputStream) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/ONNX/ONNXModelConverter.cs:119)
Unity.Barracuda.ONNX.ONNXModelConverter.Convert (System.String filePath) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Runtime/ONNX/ONNXModelConverter.cs:83)
Unity.Barracuda.ONNXModelImporter.OnImportAsset (UnityEditor.Experimental.AssetImporters.AssetImportContext ctx) (at Library/PackageCache/com.unity.barracuda@1.3.0-preview/Barracuda/Editor/ONNXModelImporter.cs:58)
UnityEditor.Experimental.AssetImporters.ScriptedImporter.GenerateAssetData (UnityEditor.Experimental.AssetImporters.AssetImportContext ctx) (at /Users/builduser/buildslave/unity/build/Modules/AssetPipelineEditor/Public/ScriptedImporter.cs:20)
UnityEditorInternal.InternalEditorUtility:ProjectWindowDrag(HierarchyProperty, Boolean)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)