Add to reading list in iOS works well for this sort of thing as it caches offline. I tried converting this sort of thing to PDF so I could read it on my kindle, but I found that my 6 inch kindle was terrible for this sort of thing. Also, the amazon conversion process couldn't handle images very well.
There really is, I think, a market for a large form factor e-reader for reading stuff offline. Nice and distraction free, long battery life, etc.
I have had the Onyx Boox M96 for half a year now and has been in general very happy with it. The UI takes a little getting used to but it is very stable and has never crashed on me, with the caveat that I don't use the browser (OS is an older version of Android). Just take care to not lose the stylus.
Would be nice if MIT Press did something like Manning's "early access" progress and started selling the book even though it is not yet finished. I would be happy to pay €€€ to get access to the evolving PDF version.
I remember there was another machine learning textbook being drafted on the web. I can't remember the name, author or url though. Anyone know what I'm talking about? Any other resources would be appreciated, too.
Yes, that's what I said. The parent was confused because previously he saw this book posted at the link I provided, and hadn't made the connection that the OP's link is the same.
Edit: when I said "this book" I was referring to the book linked to by the URL from the OP.