When the relationship between a node and its parents is deterministic, rather than probabilistic, then instead of a CPT a node may have function table, in which each row corresponds to a configuration of parent values, and the row provides a single output value for the child node (i.e. the table is a function mapping parent node tuples to child node values).  If a function table is converted to a CPT, then each row of the resulting CPT will consist only of zeroes, with a single 1 (or 100%) positioned at the state that was the function table's value for that row. More Info

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