Ways to define the conditional probabilities
State configurations
of all parents
    For nodes that have discrete
values, we could use
conditional probability tables.
    For nodes that have real values
we could let the parents define
the parameters of a Gaussian
     Alternatively we could use a
parameterized function. If the
nodes have binary states, we
could use a sigmoid:

states
of the
node
p
sums
to 1
j
i