Reducing Learning Rate and Stability
   - The standard algorithm, and a standard technique is to 
       reduce the learning rate over time.
 
   - So initially you move the centre by half, and those around by less.
 
   - As time goes by, you multiply these values by a learning rate less
       than one.
 
   - Keep reducing the learning rate.
 
   - It's possible that without reducing the learning rate, the nodes will
       continue to jump around.
 
   - If you reduce the learning rate gradually to zero, eventually,
       the nodes will stop moving.
 
   - This works here but also in a lot of other systems.
 
   - If you're having problems with your learning system stabilising,
       try reducing the learning rate over time.