How can I make this piece of code even faster?

Newsgroups	comp.lang.python
Date	2013-07-20 13:22 -0700
Message-ID	<6bf4d298-b425-4357-9c1a-192e6e6cd9f0@googlegroups.com> (permalink)
Subject	How can I make this piece of code even faster?
From	pablobarhamalzas@gmail.com

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Ok, I'm working on a predator/prey simulation, which evolve using genetic algorithms. At the moment, they use a quite simple feed-forward neural network, which can change size over time. Each brain "tick" is performed by the following function (inside the Brain class):

    def tick(self):
        input_num = self.input_num 
        hidden_num = self.hidden_num
        output_num = self.output_num
         
        hidden = [0]*hidden_num
        output = [0]*output_num
        
        inputs = self.input
        h_weight = self.h_weight
        o_weight = self.o_weight
        
        e = math.e
        
        count = -1
        for x in range(hidden_num):
            temp = 0
            for y in range(input_num):
                count += 1
                temp += inputs[y] * h_weight[count]
            hidden[x] = 1/(1+e**(-temp))  
        
        count = -1      
        for x in range(output_num):
            temp = 0 
            for y in range(hidden_num):
                count += 1 
                temp += hidden[y] * o_weight[count]
            output[x] = 1/(1+e**(-temp))  
             
        self.output = output 

The function is actually quite fast (~0.040 seconds per 200 calls, using 10 input, 20 hidden and 3 output neurons), and used to be much slower untill I fiddled about with it a bit to make it faster. However, it is still somewhat slow for what I need it.
 
My question to you is if you an see any obvious (or not so obvious) way of making this faster. I've heard about numpy and have been reading about it, but I really can't see how it could be implemented here.

Cheers!

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How can I make this piece of code even faster? pablobarhamalzas@gmail.com - 2013-07-20 13:22 -0700
  Re: How can I make this piece of code even faster? Fabio Zadrozny <fabiofz@gmail.com> - 2013-07-20 18:05 -0300
  Re: How can I make this piece of code even faster? Roy Smith <roy@panix.com> - 2013-07-20 17:25 -0400
  Re: How can I make this piece of code even faster? pablobarhamalzas@gmail.com - 2013-07-20 15:45 -0700
  Re: How can I make this piece of code even faster? Chris Angelico <rosuav@gmail.com> - 2013-07-21 08:55 +1000
  Re: How can I make this piece of code even faster? pablobarhamalzas@gmail.com - 2013-07-20 16:24 -0700
    Re: How can I make this piece of code even faster? Chris Angelico <rosuav@gmail.com> - 2013-07-21 09:29 +1000
  Re: How can I make this piece of code even faster? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-21 05:11 +0000
    Re: How can I make this piece of code even faster? Paul Rudin <paul.nospam@rudin.co.uk> - 2013-07-21 08:11 +0100
      Re: How can I make this piece of code even faster? Chris Angelico <rosuav@gmail.com> - 2013-07-21 19:21 +1000
  Re: How can I make this piece of code even faster? Peter Otten <__peter__@web.de> - 2013-07-21 09:10 +0200
  Re: How can I make this piece of code even faster? Serhiy Storchaka <storchaka@gmail.com> - 2013-07-21 10:11 +0300
  Re: How can I make this piece of code even faster? Christian Gollwitzer <auriocus@gmx.de> - 2013-07-21 09:24 +0200
  Re: How can I make this piece of code even faster? pablobarhamalzas@gmail.com - 2013-07-21 03:19 -0700
    Re: How can I make this piece of code even faster? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-21 10:31 +0000
      Re: How can I make this piece of code even faster? pablobarhamalzas@gmail.com - 2013-07-21 03:48 -0700
        Re: How can I make this piece of code even faster? Stefan Behnel <stefan_ml@behnel.de> - 2013-07-21 14:49 +0200
      Re: How can I make this piece of code even faster? Chris Angelico <rosuav@gmail.com> - 2013-07-21 20:48 +1000
    Re: How can I make this piece of code even faster? Michael Torrie <torriem@gmail.com> - 2013-07-21 09:27 -0600
  Re: How can I make this piece of code even faster? Joshua Landau <joshua@landau.ws> - 2013-07-21 12:39 +0100

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