Agree. What writing is better for understanding geometric properties or information in high dimensional vector spaces + spherical codes?

There's a lot of beautiful writing on these topics on the "pure math" side, but it's hard to figure out what results are important for deep learning and to put them in a form that doesn't take too much of an investment in pure math.

I think the first chapter of [1] is a good introduction to general facts about high-dimensional stuff. I think this is where I first learned about "high-dimensional oranges" and so on.

For something more specifically about the problem of "packing data into a vector" in the context of deep learning, last year I wrote a blog post meant to give some exposition [2].

One really nice approach to this general subject is to think in terms of information theory. For example, take the fact that, for a fixed epsilon > 0, we can find exp(C d) vectors in R^d with all pairwise inner products smaller than epsilon in absolute value. (Here C is some constant depending on epsilon.) People usually find this surprising geometrically. But now, say you want to communicate a symbol by transmitting d numbers through a Gaussian channel. Information theory says that, on average, I should be able to use these d numbers to transmit C d nats of information. (C is called the channel capacity, and depends on the magnitude of the noise and e.g. the range of values I can transmit.) The statement that there exist exp(C d) vectors with small inner products is related to a certain simple protocol to transmit a symbol from an alphabet of size exp(C d) with small error rate. (I'm being quite informal with the constants C.)

[1] https://people.math.ethz.ch/~abandeira//BandeiraSingerStrohm... [2] https://cgad.ski/blog/when-numbers-are-bits.html