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Re: AI::NNEasy to setup fast a Neural Network using just Perl and XS.

by g0n (Priest)
on Jan 15, 2005 at 12:25 UTC ( [id://422501]=note: print w/replies, xml ) Need Help??

in reply to AI::NNEasy to setup fast a Neural Network using just Perl and XS.


Just got back home and read your email & posting (I work away all week). NNEasy is nicely done.The XS code speeds it up by 10x you say?

If its OK I'll take a closer look at your code and see what might be adaptable to NNFlex. I'm particularly interested in the speed improvements & the UI changes - NNFlex UI is very unfriendly at the moment..

I wrote new methods for NNFlex yesterday to lesion networks BTW, so if you have a need for that you might want to take a look at 0.11 when I upload it & adapt the extra code.

Nice to see the formerly rather quiet AI namespace come back to life so quickly - don't you just love perl!


  • Comment on Re: AI::NNEasy to setup fast a Neural Network using just Perl and XS.

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Re^2: AI::NNEasy to setup fast a Neural Network using just Perl and XS.
by gmpassos (Priest) on Jan 15, 2005 at 18:49 UTC
    Yes, I'm interested into this new methods. And if you want any help to port resource to NNFlex just ask.

    Perl rox! ;-P

    Graciliano M. P.
    "Creativity is the expression of liberty".

      OK, I've uploaded AI-NNFlex-0.11 to CPAN, with support for datasets a little bit like the Xerion approach. It makes the UI quite a bit friendlier - if you look at ./examples/ you'll see what I mean. PNG support has been put into ::draw and the lesioning method has been implemented. You can now damage the network probabilistically on a network-wide, layer or node basis.

      I've cleaned up some of the nastiest perldoc sections aswell.

      Quick question - I haven't done any work on the XS issue. I've never encountered XS before - does it have any prerequisites? Like a C compiler?


        XS is like another mini language. First you need a C compiler, actually you need the same compiler used to compile your Perl. So, on Linux is easy since is always with GCC, but on Win32 you will need Microsoft Visual C++ 6+ (not free) if you got Perl from Active State, or MingW, that is GCC for Win32.

        Than you need to learn how Perl works with C and the resources for that (perlapi). So, take a look in the docs: perlapi, perlguts, perlxstut. All of that you can find better at

        If you already know C, I think that the best way to you make XS functions with Perl is getting as examaple the sub{C} methods that you can find in the sources of AI::NNEasy. Because this functions have a Perl and a C version, so you can compare them and understand better what the C macros does. Also the Class::HPLOO syntax is easy like sugar, since you only need to write the function, all the rest Class::HPLOO will write for you, converting to Inline::C, than Inline will convert to XS, and from XS is with Perl. So, the code below is 100% complete, you just need to have a C compiler well installed:

        use Class::HPLOO ; class Foo { sub[C] int add( int x , int y ) { int ret = x + y ; return ret ; } }
        Now you just need to run the code above, and the rest is automatically.

        Other thing, your module is inside AI::NNEasy starting from the class AI::NNEasy::NN. So, if you move this class (and the sub classes sinde AI::NNEasy::NN::*) to your project you will have your modules with the resources that I have added to it. I let it separated to be more easy to you to get back the work that I did, so be free to use it. ;-P

        Graciliano M. P.
        "Creativity is the expression of liberty".

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