Thanks, Brian, I must have been lucky when I picked @: instead of @
(still learning). I was using the explicit version (which turns out to
be fast too) before I decided to try tacit.
I also tried e^x/(1+e^x)
sigmoid3=: (%>:)@:^
Twice the space, only a bit faster.
Best regards,
Dimitri
On Wed, Feb 19, 2020 at 4:23 PM Brian Schott <schott.br...@gmail.com> wrote:
>
> Dimitri,
>
> I have dabbled in nn in J. Your presentation is very professional and clean
> looking to me.
> As others have said, your addon seems really desirable.
>
> Just playing with your version of sigmoid relative to one I have used in
> the past taught me a great lesson about timing. In the excerpt below, my
> version of sigmoid(b) is much slower than yours, and according to my
> similar experiment using j807, j9 has made your version of sigmoid even
> better so it matches the space required of sigmoid(b), as well (in j807,
> your sigmoid demanded more space).
>
> Last login: Fri Feb 14 14:53:43 on ttys004
> server:~ brian$ /Users/brian/j901/bin/jconsole ; exit;
> JVERSION
> Engine: j901/j64avx/darwin
> Release-c: commercial/2020-01-11T12:22:31
> Library: 9.01.20
> Platform: Darwin 64
> Installer: J901 install
> InstallPath: /users/brian/j901
> Contact: www.jsoftware.com
> sigmoid=: %@: (>: @:( ^@:-))
> sigmoidb=: %@:>:@^@-
> 5!:6<'sigmoid'
> %@:(>:@:(^@:-))
> 5!:6<'sigmoidb' NB. to show details
> ((%@:>:)@^)@-
> base =. 1e6?.@$0
> sign =. 1e6?.@$2
> val =. (_1+2*sign)*base
> 6{.val NB. to show examples
> _0.038363 0.329284 _0.335644 0.985972 0.0583756 _0.282326
> timespacex'sigmoid val' NB. MUCH faster
> 0.016461 8.38963e6
> timespacex'sigmoidb val'
> 0.910234 8.39002e6
>
>
>
> On Wed, Feb 19, 2020 at 5:51 AM Dimitri Georganas <d...@biodys.com> wrote:
>
> > Hi,
> >
> > I've started using J last year when I was looking for a computer
> > language to implement a neural network to gain some insight into some
> > complex chemical reactions. I uploaded the code to GitHub
> > (dimgeo/neural), and I was wondering if there's any interest in having
> > something like this as an addon. If so, I will trim the code, add a
> > locale and the usual exports to make the functions accessible from
> > other applications in the next update.
> >
> > Best regards,
> >
> > Dimitri Georganas
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
>
>
> --
> (B=) <-----my sig
> Brian Schott
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
