Use ONNX in Application.persistentDataPath folder

Unity Engine
,
1

Hi everyone,
I would like to use an onnx file external to the build so I can update it remotely without republishing the app (iOS and Android). ONNX works perfectly if I import it into Unity with drag and drop. So I’m 100% sure the problem is not the file. What I do? I download the file via a UnityWebRequest like this:

using (UnityWebRequest request = UnityWebRequest.Get(URL_Model))
         {
             yield return request.SendWebRequest();
             if (request.result != UnityWebRequest.Result.Success)
             {
                 Debug.LogError("Failed to download file: " + request.error);
             }
             else
             {
                 string filePath = Application.persistentDataPath + "/model.onnx";
                 File.WriteAllBytes(filePath, request.downloadHandler.data);
             }
         }

And then, on the model I downloaded locally I do this to convert it in runtime:

ModelAsset asset = new ModelAsset
        {
            name = "opere_converted_pretrained",
            modelAssetData = new ModelAssetData(),
        };
        var ONNXPath = Application.persistentDataPath + "/model.onnx";
        Unity.Sentis.ONNX.ONNXModelConverter onnx = new ONNXModelConverter(true, ONNXPath);

        Model model = onnx.Convert();

        using (var memoryStream = new MemoryStream())
        using (var writer = new BinaryWriter(memoryStream))
        {
            ModelWriter.Save(writer.BaseStream, model);
            byte[] bbb = memoryStream.ToArray();
            asset.modelAssetData.value = bbb;
            kerasModel = asset;
        }

In the inspector it’s 100% identical to the dragged onnx into Unity.

in
in1692×2188 435 KB

But if I try to console log some value modelWeightsChunks and modelAssetData :
modelWeightsChunks0: 5926022
modelAssetData(Unity): 26307

modelWeightsChunks(Converted ONNX from Online): null
modelAssetData(Converted ONNX from Online): 59286535

Any one have a solution?

2

Ok, I found a solution.
just use the model in
Model model = onnx.Convert();
in
WorkerFactory.CreateWorker(backend, runtimeModel);

without any convertion and loading of ModelAsset

3

you can serialize the imported onnx file to a .sentis file.
This can then be downloaded at runtime