In Lace there are a number of operations that seem redundant. Why is there
impute? Why is there
one can simple compute
-logp? The answer is that the are in-table operations
and out-of-table (or hypothetical) operations. In-table operations use the
probability distribution at a certain cell in the PCC table, while out-of-table
operations do not take table location, and thus category and view assignments
into account. Hypothetical operations must marginalize over assignments.
Here is a table listing in-table and hypothetical operations.
|Draw random data
|Find argmax of a likelihood