
















• 
Suppose we could
observe



the states of all
the hidden



units when the
net was



generating an
observed data



vector.




– 
This
is equivalent to getting



samples
from the posterior



distribution
over hidden



configurations
given the



observed
datavactor.



• 
For each node,
it is easy to



maximize the log
probability of


its observed
state given the



observed states
of its parents.

