Books
Machine learning with Go - https://www.amazon.com/Machine-Learning-Classification-Time-...
Go Machine Learning Projects - https://www.amazon.com/Go-Machine-Learning-Projects-Ultimate...
Libraries
https://gorgonia.org/
https://www.gonum.org/
A good talk (although from a from years back), explaining why Go for ML could be a good idea:
https://www.youtube.com/watch?v=D5tDubyXLrQ