











• 
We need to keep
the efficiency of using a gradient method



for adjusting the
weights, but use it for modeling the



structure of the
sensory input.




– 
Adjust
the weights to maximize the probability that a



generative
model would have produced the sensory



input.
This is the only place to get 10^5 bits per second.



– 
Learn
p(image) not p(label  image)



• 
What kind of
generative model could the brain be using?

