Boyen and Koller, we have added discrete evidence nodes.)
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We have "unrolled" the model for three "time slices" -- the structure and parameters are
assumed to repeat as the model is unrolled further.
Hence to specify a DBN, we need to
define the intra-slice topology (within a slice),
the inter-slice topology (between two slices),
as well as the parameters for the first two slices.
(Such a two-slice temporal Bayes net is often called a 2TBN.)
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