It's just a reference, I wouldn't view it as teaching material.

Its quite useful to look things up in.

Yep, this is an extended survey of interrelated concepts organized according to increasing complexity.

Similar to textbooks in the organizational principle, but differentiated in substance in that it assumes familiarity with the underlying topics and focuses on the relationships between the concepts rather than the concepts themselves. Good for practitioners I think.

I can't wait for all the LinkedIn and Twitter posts in which people who have never read any of this will praise it as a great resource to other people who will like and share it but never actually read it.

The book is still in progress [0]. For example, the introduction has yet to be written, which presumably would answer some of these questions about the intended audience.

The author also has books [1] on tangentially related subjects, several with a good amount of overlap in material.

[0] https://www.cis.upenn.edu/~jean/gbooks/geomath.html

[1] https://www.cis.upenn.edu/~jean/gbooks/home.html

I feel this is good foundation in CS and interested into more advanced ML and math. At least for me I feel excited when reading the toc since I have touched many of those concept over the years but never went deeper

The space of permissible transformations is of great interest since moving beyond linear combination alla ANNs has lead to great performance strides in deep learning?

> just banging out definitions and theorems

This is pretty standard for graduate-level math texts, though. That might say something about their intended audience.

It is a textbook.