This was...
This book was a few years in the making and it was released in stages. It covers the maths to some depth and the author explains key points.
I already knew...
I was already familiar with some of the basic linear algebra, and also some of the calculus. This material was denser and harder to go through. I didn't complete the whole book, but then I haven't had all of the chapters yet.
What was new...
I was not familiar with some of the probability theory, but machine learning is Glorified statistics and Inference might be better described as statistical guessing.
I particularly liked...
At some point you have to dive into the depths and this was deep.
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