title: Disable certain output nodes in PyBrain
body: <p>I'm creating a simple feed-forward neural network in PyBrain to classify characters (26 lower case, 26 upper case and 10 numbers) </p>
  
  <p>There are two different documents - one has only upper case letters and numbers and the second has lower case letters, numbers as well as upper case letters. </p>
  
  <p>Do I have to create two different networks ? Is there any way to disable the upper case nodes when the first document is being processed ? If more document (images of documents) are integrated to the project later, there will be other combinations too. Creating new networks for them all seems tedious. </p>
  
  <p>Thanks in advance </p>
  
  <p>PS: Does anyone know any really (really) good tutorials on pyBrain ? I'm a beginner and the documentation only addresses really simple examples. </p>