Owl is a library written for machine learning-oriented data processing.
Owl GitHub (the core libraries, no gha published yet): https://github.com/mateuszzwierzycki/Owl
Accord Framework (used for the Owl.Accord.* libraries): https://github.com/accord-net/framework
1. Unzip, copy all the files to the Grasshopper Libraries folder
2. Unblock all the files (right-click>properties>unblock).
3. Run/Restart Rhino