System information

• OS version/distro: Version Windows 10.0.17763

• .NET Version (eg., dotnet --info): .Net 4.6.2

Issue Error when using OnnxTransformer in two AppDomains

• What did you do?

I have a (production) application with two AppDomains.
I'm trying to run OnnxTransformer in my code within the AppDomain, and get an error when second AppDomain is invoked.
The error is easily reproduced in a Console App with two AppDomains (below).

• What happened?

Error is thrown.

Microsoft.ML.OnnxRuntime.OnnxRuntimeException: '[ErrorCode:RuntimeException] Only one instance of LoggingManager created with InstanceType::Default can exist at any point in time

Source code / logs

Here is simple code to reproduce the error:

namespace MlNetAppDomainErrorRepro
{
using System;
using Microsoft.ML;
using Microsoft.ML.Transforms;

class Program
{
    public static void CreateOnnxTransformer()
    {
        MLContext context = new MLContext();
        OnnxTransformer t = new OnnxTransformer(context, @"PathToYourModel.onnx");
    }

    static void Main(string[] args)
    {
        CreateOnnxTransformer();

        AppDomain secondAppDomain = AppDomain.CreateDomain("SecondAppDomain"); 

        secondAppDomain.DoCallBack(CreateOnnxTransformer); // error here

        Console.ReadLine();
    }
}

}