I have not yet decided on a license so for the time being all rights are reserved. Whatever license I end up using will include restrictions on use of my work for training AI (as well as other AI-related use of my work).
Since I have never licensed this work under any terms except all rights reserved, I consider this limitation to be in effect for all past versions of this work, as well as the current version - as the right to train AI based on my work is, in fact, a right; and it's a right that I have never granted.
I will eventually license my work under an open-source license (probably a modified CC-BY-SA 4.0 or a modified CC-BY-NC 4.0).