From: ted.dunning@gmail.com   
      
   On May 9, 12:04 am, "TiGeR"  wrote:   
   > I've found the solution!   
   >   
   > I had to change my activation function from hiperbolic   
   > tangens to sigmoid.   
   >   
   > Regards...   
   >   
      
   That is not the answer.   
      
   Any function with a unimodal derivative could be used to approximate   
   the function.   
      
   Indeed, even a step activation function could be used.   
      
   You are missing something fundamental.   
      
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