Last week at its annual Build conference, Microsoft announced ML.NET, an "open source and cross-platform machine learning framework" that runs in .NET Core. I took a look at the getting started samples and realized ML.NET would be a great tool to use in OpenFaas functions.
I decided to write a proof-of-concept function based on the ML.NET sentiment analysis sample. Because the function needs a trained model before it can run, you actually need to use a separate application to generate the model and save it as a file. Then you can include the model as part of your function deployment.
Here's a screenshot of my function in action.