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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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The database in fig. 20.2 is extracted from experts or other reasoning<br />

systems. The machine learning unit grabs these data <strong>and</strong> attempts to acquire<br />

new knowledge out of it. The acquired knowledge is then transferred to the<br />

knowledge base for future usage. In some systems, the knowledge base need<br />

not be extended, but may be refined with respect to its internal parameters. For<br />

instance, certainty factor of the rules in a knowledge base may be refined<br />

based on the estimated certainty factors of proven case histories. A generic<br />

scheme for knowledge refinement is presented in fig. 20.3.<br />

Dynamic<br />

Knowledge base<br />

Machine learning<br />

System<br />

Acquired<br />

knowledge<br />

Other reasoning<br />

Systems<br />

Database<br />

Fig. 20.2: Principles of automated knowledge acquisition.<br />

Experts<br />

Fig. 20.3 presents a scheme for automatic estimation of some<br />

parameters in an expert system. For instance, certainty factor of knowledge<br />

may be refined from their initial values <strong>and</strong> steady-state inferences of n<br />

number of proven case histories. The refinement should be carried out in a<br />

manner, so that steady-state inferences are consistent with the derived<br />

certainty factors. However, all n problems being similar, it is likely that some

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