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Knowledge Representation

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Presentation on theme: "Knowledge Representation"— Presentation transcript:

1 Knowledge Representation
why bother ? what is it ? what do we represent ? how is it represented ? Kn Repn strategies inferencing example tasks

2 why bother ? intelligence & knowledge
reacting to sensory infm using tools communication learning human knowledge organisation the messed up species

3 psychological clues interlinking cognitive limitations
voice – person – mood sound/smell – memory – reminiscence vis-ob – properties – ownership cognitive limitations levels of infm & retrieval attention short-term memory field dependency

4 physiological clues perceptive pre-processing
brain areas & malfunctions memory freezing the elephant's toenail unknown ownership / name the speechless monk (Aitchison P.39)

5 who cares? feathers & flight random sorts
chaos, complexity & emergent behaviour

6 why bother ? a language example
The old man the boats. I saw the racing pigeons flying to Paris. I saw the Eiffel Tower flying to Paris. The boy kicked the ball under the tree. The boy kicked the wall under the tree. Put the apple in the basket on the shelf

7 what is it ? declarative forms procedural forms inference data facts
processing retrieval / linking / lumping inference encyclopaedia analogy

8 what do we represent ? objects (& their relationships)
events (& sequences) performance (& cause & effect) meta kn extent, priority, strategy, reliability, importance

9 Kn Repn strategies facts & rules logic semantic nets frames scripts
conceptual dependency

10 a simple semantic net has yellow

11 general capabilities inheritance defaults demons perspectives

12 inferencing rule application & deduction generalisation
detecting similarity measuring differences

13 tasks automatic rule generation IQ tests learning (near miss) planning
agent interaction (conflict & co-operation) human dialog management


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