Multithreaded matrix multiplication in Rust with rayon: https://athemathmo.github.io/2016/04/16/multithreading-multiplication-1.html (comes pretty close to BLAS in some cases!)
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Contrasting convolution to multiplication, and some great examples to build intuition: https://betterexplained.com/articles/intuitive-convolution/
Interesting to see objections on HN to the new Python matrix multiplication operator. It shows how much people like Python syntax.
New #Python syntax PEP has been accepted! http://t.co/T9avCqCZnl (infix matrix multiplication)