There was a footpath leading across fields to New Southgate, and I used to go there alone to watch the sunset and contemplate suicide. I did not, however, commit suicide, because I wished to know more of mathematics.

What is an autoencoder?

Why The Second Derivative Test Works In One Dimension

I’m here to ask you one question, and one question only.

I actually prefer the term macOS to OSX.

Prerequisites (In Order Of Importance)

If your buffer has empty lines, they are filled with annoying tildes. Vim 8 and Neovim finally fix this by allowing you to conceal them with the following command:

I have (what I find) a handy mnemonic for the law of total variance. It’s also sometimes called the conditional variance formula, or (the reason for this mnenomic) Eve’s law. At least if I’m quoting Wikipedia right.

I forget where I’ve seen this, but I like using a squiggly arrow to represent a function that returns a probability.

(n,) vs. (n, 1)

Algebraic manipulation is always a fun way to make something profound seem like mere trickery.

1 or 2 # returns 1, not True
(1 or 1) == True # returns False

Running plt.show() causes all sorts of issues on macOS. To fix them, switch your matplotlib backend to something besides MacOSX. I used Qt5Agg.

From I Want to be a Mathematician, Paul Halmos’s autobiography.

Understanding the fundamentals in chapter 5, especially over and underfitting, really pays off. This chapter is really easy to read if you can even half-remember those earlier sections.

I’m glad I read this early on, because it’s kept me going ever since.