In short, Apple has created a fork of TensorFlow (a machine learning package) which is accelerated on Macs (including the new M1 Macs).

One of the problems I've encountered when trying out machine learning ideas is that a lot of sample code and tutorials out there are written with TensorFlow in mind, but CoreML is the standard library on MacOS. And the TensorFlow to CoreML model converters seemed a bit finicky. I'm hoping this new Apple improved branch of TensorFlow will be a lot nicer.