Experiments with free energy minimization, i.e. prediction error minimization, i.e. predictive processing--in the neuroscience sense.
(My starting point is this excellent article: Rafal Bogacz, "A tutorial on the free-energy framework for modelling perception and learning", Journal of Mathematical Psychology, Available online 14 December 2015, ISSN 0022-2496, http://dx.doi.org/10.1016/j.jmp.2015.11.003 .)
The documentation is a work in progress. Some of the code is, too.
There is a running demo version of this software here: http://members.logical.net/~marshall/free/ .
This software is copyright 2016 by Marshall Abrams, and is distributed under the Gnu General Public License version 3.0 as specified in the file LICENSE, except where noted, or where code has been included that was released under a different license.
You should be able to run free either in Clojure or Clojurescript. I describe some ways to do this below (in development).
In Clojure, you can run it either in scalar mode or matrix mode. The first is designed for learning and processing with single scalar values. The second allows you to use vectors and matrices as values; that is, it allows multi-dimensional learning. (You can use matrix mode for "scalars" by using 1x1 vectors/matrices, but it will be a lot slower, which might matter in some situations.) At present, the Clojurescript version only supports scalar mode.
You can use lein repl but you need additional arguments to specify
scalar or matrix mode. There are unix shell scripts in the directory
src/scripts that collect the relevant arguments, if you're using OS X or
Linux or another unix. For Windows, take a look at the contents of the
scripts and execute a script's last line. In a unix:
./src/scripts/matclj
./src/scripts/scalclj
If you're in Windows, see the note above. In OS X, Linux, or another unix, run this script:
./src/scripts/scalcljs
If you get an error about rlwrap, either install rlwrap or execute use the last line of the script in a shell without the word "rlwrap". rlwrap provides command history for the Clojure repl prompt, so it's not essential.
To build a version that can be installed on the web, for example, use:
./src/scripts/scalcljs-build
This will put the files that make up the application in resources/public and resources/public/css.
As noted above, there is also a constrained Clojurescript version of the model ready to run on the web here: https://github.com/mars0i/free .