A domain specific language for expressing neural networks using Clojure data types.

• a Map specifies a single neuron e.g.

  ;; a simple neuron which sums two unit inputs
  (run {:phi (fn [n x] (reduce + (map * (n :weights) x)))
        :weights [1 1]}
       [1 1]) ; => 2
  

  

• Vectors are used to represent an ordered series of neural elements to be executed in serial

  ;; two neurons in serial
  (let [n {:phi (fn [n x] (reduce + (map * (n :weights) x)))}
        net [(assoc n :weights [1 1]) (assoc n :weights [2])]]
    (run net [1 1])) ; => 4
  

  

• Lists are used to represent a unordered series of neural elements to be executed in parallel.

  ;; a layer of three neurons in parallel followed by a single neuron
  (let [n {:phi (fn [n x] (reduce + (map * (n :weights) x)))
           :weights [2 2 2]}
        net [(list n n n) n]]
    (run net [1 1 1])) ; => 36
  

  

• Graphs – unlike the previous data types which are built into Clojure Graphs are specific to this library

  (note: this functionality is still in development, specifically training may still be buggy)

  ;; three neurons connected using an arbitrary edge set
  (let [n {:phi (fn [n x] (reduce + (map * (n :weights) x)))
           :weights [2 2]}
        g (Graph. {:a n :b n :c n} [[:a :b] [:a :c] [:b :c]])]
    (run g [1 1 1])) ; [28]
  

  

Example implementations are given for the following types of neural networks.

• perceptrons
• back propagation networks
• radial basis neurons
• self organizing maps
  <iframe src="http://player.vimeo.com/video/16989946" width="400" height="300" frameborder="0"></iframe>

  self organizing map from Eric Schulte on Vimeo.

Copyright (C) 2010 Eric Schulte

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.