Machine learning algorithm benchmarked in Matlab, R and Scala(blog.brusic.com)

32 pointsby donretag15 anni fa11 comments

blog.brusic.com

Machine learning algorithm benchmarked in Matlab, R and Scala

http://blog.brusic.com/2011/08/machine-learning-ex2-benchmarks.html

5 comments

bufo15 anni fa

As it says in the post, this is just the benchmark of a for loop, and the author rightly says that nothing can be inferred from it.

When it comes to prototyping, using languages such as scala brings nothing for such type of mathematical algorithms as it is basically only loops and double operations. You are better off with languages such as R/scipy where most of the core is written in C/C++ and handily wrapped (there are many heavily optimized packages in R to do gradient descent).

For production code, well, you know the correct solution ;)

joelthelion15 anni fa

None of this is as fast or efficient as implementing most of the stuff in python/scipy and reimplementing the occasional hot spot in C++ :)

lliiffee15 anni fa

I've found Matlab to consistently outperform numpy (the gap growing in recently releases adding multithreading supprt to Matlab), and the C++ interface is pretty much equally convenient. (Weave is awesome for python, but only really usable in small toy problems.)

jgorham15 anni fa

I wonder if in his installation of R he has ATLAS build in as the linear algebra workhorse. That seems to be optimized for something like this- I wonder how this would affect R's speed.

ibgeek15 anni fa

This post compares Octave, not MATLAB. Similar languages, but completely different implementations. I'd bet that if it were tested in MATLAB, it'd be much faster.

brusic15 anni fa

Just joined hacker news in order to comment.

You are correct, the MATLAB code was tested in Octave. I would not have worded the title HN is such a way. The goal is to learn the algorithms involved, not trying to come up with the fastest version possible. The interesting part is actually the performance of the JVM, not the comparison between languages.

Mavrik15 anni fa

I've observed (when doing Computer Vision algorithms) that MATLAB can be 10-times faster, in certain very tight loop calculations even more than 100-times faster than Octave.

So I don't think those are really representative of MATLAB performance.

MrMan15 anni fa

Good luck spending thousands of man-years reimplementing all of statistics and numeric computing in Scala.

cema15 anni fa

But how about reimplementing R in Scala? Or, better yet, in Clojure? The best of both worlds.

icey15 anni fa

I'm sure you're already aware of this, but just in case:

http://incanter.org/

cema15 anni fa

Indeed, Incanter is a famous project and for a while was one of the best showcases for Clojure.

What it does is it implements some of the functionality of R in Clojure. What I am talking about is instead compiling R to Clojure (or Java runtime; there are portions of R projects implemented in C which may not map to Clojure efficiently). This way, the R community does not lose the extensive library of projects it has been producing for years.