On Monday, 25 February 2013 18:17:50 UTC+8, Mikera wrote:
> Hi All,
>
> Pleased to announce the latest release of vectorz-clj, a high performance
> vector and matrix math implementation for Clojure.
>
> GitHub site: https://github.com/mikera/vectorz-clj
> Clojars: https://clojars.org/net.mikera/vectorz-clj
>
> Key features:
>
> a) 100% pure JVM code (no native libraries required)
> b) Supports a clean, functional, idiomatic style of vector and matrix
> maths in Clojure
> c) Currently the most complete implementation of the "core.matrix" API for
> Clojure numerics
> d) Very fast - designed for games, simulations, machine learning
> applications etc.
>
> For an idea of performance, it is worth comparing with regular Clojure
> vectors:
>
> (let [a [1 2 3 4 5 6 7 8 9 10]
> b [1 2 3 4 5 6 7 8 9 10]]
> (c/quick-bench (dotimes [i 1000] (vec (map clojure.core/+ a b)))))
> ;; => Execution time mean per addition : 1221 ns
>
> Using vectorz-clj to do the same additions is about 15-20x faster:
>
> (let [a (matrix :vectorz [1 2 3 4 5 6 7 8 9 10])
> b (matrix :vectorz [1 2 3 4 5 6 7 8 9 10])]
> (c/quick-bench (dotimes [i 1000] (+ a b))))
> ;; => Execution time mean per addition: 68 ns
>
> If you are willing to abandon immutability and use mutable vectors, you
> can go faster still:
>
> (let [a (matrix :vectorz [1 2 3 4 5 6 7 8 9 10])
> b (matrix :vectorz [1 2 3 4 5 6 7 8 9 10])]
> (c/quick-bench (dotimes [i 1000] (add! a b))))
> ;; => Execution time mean per addition: 31 ns
>
>
Incidentally, I found that if you call Vectorz methods directly using Java
interop, you can go even faster again. I think the difference is mainly in
the overhead of making a polymorphic call via a dynamically extended
Clojure protocol, but I need to investigate a bit further to figure out
what is really happening here:
(let [a (Vectorz/create [1 2 3 4 5 6 7 8 9 10])
b (Vectorz/create [1 2 3 4 5 6 7 8 9 10])]
(c/quick-bench (dotimes [i 1000] (.add a b))))
;; => Execution time mean per addition: 11 ns
> This is all still very much in early development, so feedback / ideas /
> code contributions all very welcome!
>
> Mike.
>
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