ML.NET export to ONNX

Question

NET GUI tools to train model. The model works great with C# application, but I want to have it in ONNX format. I have found tools which are converting between model formats, but couldn't find anything for ML.NET generated format. Apparently it's some zip file, and nothing more I know about it. does anyone know a tool to do conversion to ONNX. Thanks

Answer 1

Use the Microsoft.ML.OnnxConverter NuGet Package. Something like this:

var mlContext = new MLContext();

...

IDataView trainingData = mlContext.Data.LoadFromEnumerable(inputData);

var pipeline = mlContext.Transforms.Concatenate("Features", ... )
    .Append(...));

var model = pipeline.Fit(trainingData);

using (var onnx = File.Open("mymodel.onnx", FileMode.OpenOrCreate))
{
    mlContext.Model.ConvertToOnnx(model, trainingData, onnx);
}