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The book should add a subtitle "Includes 116 line implementation of an in memory database" https://github.com/joelgrus/data-science-from-scratch/blob/m... +90 line implementation of neural networks, wow that is some beautiful code

Thank you! I worked very hard to make the book's code clear and beautiful.

Please add some summary comments in each file, like what it does.

he wrote a whole book of comments...

Normally I'd agree, but in this case the code is just one part of offering. You want docs, you buy the book. I know I will.