CompileModelAsync.cs

async Task CompileModelAsync()
{
    //Define remote URL
    var model_remote_url = "";
    var model_name = "FruitModel";
    var model_file_extension = "mlodel";

    string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
    string model_path = Path.Combine(path, $"{model_name + model_file_extension}");

    //Retry up to 3 times, on success break
    foreach (var i in Enumerable.Range(0, 2))
    {
        var success = false;
        try
        {
            using (var client = new HttpClient())
            {
                using (var response = await client.GetAsync(model_remote_url, HttpCompletionOption.ResponseHeadersRead))
                {
                    using (var stream = await response.Content.ReadAsStreamAsync())
                    {
                        using (Stream streamToWriteTo = File.Open(model_path, FileMode.Create))
                        {
                            await stream.CopyToAsync(streamToWriteTo);
                            success = true;
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            success = false;
        }

        if (success) break;
    }

    try
    {
        var bundle = NSBundle.MainBundle;
        var model_local_url = bundle.GetUrlForResource(model_name, model_file_extension); //need to handle error if file is corrupt/locked

        var compiled_model = MLModel.CompileModel(model_local_url, out var error);
        if(error == null)
        {
            Debug.WriteLine($"Compiled model is located at: {model_local_url.AbsoluteUrl}");

            var model = MLModel.Create(compiled_model, out error);
            if(error == null)
            {
                var vision_model = VNCoreMLModel.FromMLModel(model, out error);
                if(error == null)
                {
                    //do requests and stuff with vision model
                }
            }

        }
    }
    catch (Exception ex)
    {
        throw ex;
    }
}