Read An in-depth look at Core ML 3:

We’re mostly going to look at the mlmodel format here, not the API from CoreML.framework (which, except for adding training functionality, didn’t really change much).

Do you need to know this stuff if you’re just looking to convert an existing model and use it in your app? Probably not. But it’s definitely good to have as a reference for when you’re designing your own machine learning models that you intend to use with Core ML 3, or when you’re not sure an existing model can be converted.

Learned keystroke for force quit on macOS. Hard to believe that after 15 years on Mac I still can’t remember it.