nn.rb
A toy Neural Network, from scratch, in Ruby. For learning purposes.
The Neural Network framework is in nn.rb.
XOR
See xor.rb for the canonical XOR example:
$ ruby xor.rb
----------- epoch 100 -----------
0 XOR 0 = 0.50 error = +0.50
0 XOR 1 = 0.38 error = -0.62
1 XOR 0 = 0.54 error = -0.46
1 XOR 1 = 0.78 error = +0.78
...
----------- epoch 1000 -----------
0 XOR 0 = 0.09 error = +0.09
0 XOR 1 = 0.91 error = -0.09
1 XOR 0 = 0.91 error = -0.09
1 XOR 1 = 0.08 error = +0.08
Predicting letters from images
See letters.rb for a more interesting example, predicting letters from 4x5 "images" of letters:
$ ruby letters.rb
* * *
*
*
*
* * * *
A: 2.8%
B: 1.3%
C: 94.2%
D: 3.9%
$ ruby letters.rb
* * *
* *
* *
*
* * * *
A: 2.1%
B: 0.9%
C: 34.1%
D: 73.4%
$ ruby letters.rb
* * *
* *
* *
* *
* * * *
A: 2.9%
B: 1.0%
C: 7.1%
D: 92.9%