Have you tried ML.NET?
It's a new machine learning framework made specifically for .NET developers.

Download .NET Core

.NET Core is a cross-platform version of .NET for building websites, services, and console apps.

Not sure what to download? See recommended downloads for the latest version of .NET.

Versions of .NET Core available for download
Version Status Latest release Latest release date End of support
.NET Core 3.1 (recommended) LTS 3.1.0 2019-12-03
.NET Core 3.0 Maintenance 3.0.1 2019-11-19 2020-03-03
.NET Core 2.2 Maintenance 2.2.8 2019-11-19 2019-12-23
.NET Core 2.1 LTS 2.1.14 2019-11-19
.NET Core 2.0 End of life 2.0.9 2018-07-10 2018-10-01
.NET Core 1.1 End of life 1.1.13 2019-05-14 2019-06-27
.NET Core 1.0 End of life 1.0.16 2019-05-14 2019-06-27