Machine learning tutorials

[https://github.com/JeffFessler/ismrmml2] (https://github.com/JeffFessler/ismrmml2)

Originally this work was located at [https://web.eecs.umich.edu/~fessler/papers/files/talk/18/ml2jf] (https://web.eecs.umich.edu/~fessler/papers/files/talk/18/ml2jf)

See the "Examples".