Discussion
What is approximate inference by sampling?
Answer: A
Ancestral sampling draws values for each node given its parents, and the frequency of the query event among the samples estimates its probability, with accuracy improving as the square root of the sample count. Network simplification and parameter estimation are different activities. Trading an exact answer for one whose error can be made as small as computation allows is the standard escape when exact inference is intractable. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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