On 7/28/12 4:52 PM, Timothy Washington wrote:
Hey Jim,
Encog does look very interesting. Right now, I'm trying (and failing)
to implement the sigmoid function. I'm using wikipedia's reference
<http://en.wikipedia.org/wiki/Sigmoid_function>, and trying to
use Incanter's (incanter/exp) function, but Incanter's function
doesn't seem to work:
user> user> (incanter/exp -3254604.9658621363)
0.0
user> user> (incanter/exp 3254604.9658621363)
Infinity
Try this...
(use 'incanter.core)
=> (defn sigmoid [z]
(div 1 (plus 1 (exp (minus z)))))
=> (sigmoid 0)
0.5
=> (sigmoid 7)
0.9990889488055994
=> (sigmoid 112)
1.0
=> (sigmoid -112)
2.285693676718672E-49
If you want the library to be fast you will want to be using primitives
or use the underlying colt API.. for learning purposes you don't really
need to worry about that though.
HTH,
Ben
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