23
The generative model
To generate data:
1. Get an equilibrium sample from
the top-level RBM by performing
alternating Gibbs sampling
forever.
2. Perform a top-down ancestral
pass to get states for all the
other layers.
   So the lower level bottom-up
connections  are not part of the
generative model
    h3
             h2
        h1
   data