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Unit 7: Probabilistic Reasoning

7.6 Keywords Notes

Frames: Frame is a data structure that typically consists of: Frame name, Slot-filler (relations
target), Pointers (links) to other Frames, Instantiation Procedure (inheritance, default,
consistency).
Parts: A precondition (or IF) and an action (or THEN); if a production’s precondition matches
the current state of the world, then the production is said to be triggered.
Predicate Logic: Predicate is a function may be TRUE for some arguments, and FALSE for others.
Production Rules: Consists of a set of rules about behavior; a production consists two.
Scripts: The Scripts are linked sentences using frame-like structures; e.g., a record of sequence of
events for a given type of occurrence.
Semantic Networks: Semantic net is just a graph, where the nodes represent concepts, and the
arcs represent binary relationships between concepts.

7.7 Review Questions

1. Define logical reasoning.
2. What is probabilistic reasoning?
3. Write few lines on probabilistic argumentation.

4. Differentiate uncertainty with ignorance.
5. Define derivation of degrees of belief.
6. What are the problems with current approaches to uncertainty?

7. Explain uncertainty in probabilistic reasoning.
8. Explain with an example, intelligent reasoning about uncertainty.

Answers: Self Assessment

1. True 2. False
3. False 4. False
5. False 6. False

7. False 8. True
9. True 10. True
11. True 12. False
13. False 14. True

15. True 16. True

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