Other Deep Nets
   - There are a wide range of other deep network approaches.
 
   - See the Deep 
       Learning Wiki.
 
   - They are now the hot topic.
 
   - They are being successfully used for very large data problems.
 
   - The key is that they have a lot of potential variables 
       inside them.
 
   - The other key is that the algorithms that they use automatically
     select important features from the data set.
 
   - The final key is that there is a lot of marked up data that the
     supervised algorithm can use.
 
   - One problem is that they are liable to overfitting.