Differentiable programming for gradient-based machine learning
forums.swift.org
forums.swift.org
Examples of library issues: there is C++ support in tensor flow, but not for training.
Matlab and Mathematica both have interesting machine learning features but are probably orders of magnitude lower usage levels compared to Python.
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
A good talk (although from a from years back), explaining why Go for ML could be a good idea:
"The principles behind Differentiable Programming - Erik Meijer" https://www.youtube.com/watch?v=lk0PhtSHE38