# User:Sethalves/scheme-perceptron

From Noisebridge

#!/usr/bin/guile \ --debug -s !# (use-modules (ice-9 format)) (define (dot-product v0 v1) (apply + (map (lambda (m0 m1) (* m0 m1)) v0 v1))) (define (sigmoid beta x) ;; sigmoid (beta, x) = 1/(1+e^(-beta*x)) (/ 1.0 (+ 1.0 (exp (* x (- 0.0 beta)))))) (define (sigmoid-1 x) (sigmoid 1.0 x)) (define (perceptron) (let ((inputs (list (list 1 0 0) (list 1 0 1) (list 1 1 0) (list 1 1 1))) (answers (list 1 1 1 0)) (weights (list 0.0 0.0 0.0))) (format #t "inputs : ~a~%" inputs) (format #t "answers : ~a~%" answers) (format #t "starting weights : ~a~%" weights) (format #t "ending weights : ~a~%" (mainfunc inputs answers weights)) )) (define (mainfunc inputs answers weights) ;; (format #t "weights : ~a~%" weights) (let ((checked (check-all-inputs inputs weights answers))) (if (equal? checked weights) weights (mainfunc inputs answers checked)))) (define (check-all-inputs inputs weights answers) (let loop ((inputs inputs) (weights weights) (answers answers)) (if (null? inputs) weights (loop (cdr inputs) (adjust-weights (car inputs) weights (car answers)) (cdr answers))))) (define (adjust-weights inputs weights answer) (let* ((got (sigmoid-1 (dot-product inputs weights))) (err (- answer got))) (map (lambda (input weight) (* (+ weight (* err 0.1)) input)) inputs weights))) (perceptron)