tailieunhanh - Báo cáo khoa học: "ON THE EXISTENCE OF PRIMITIVE MEANING UNITS "

The decision of whether or not to have a primitive-based scheme is crucial since it affects the knowledge that is stored and how that knowledge may be processed. We suggest that a knowledge representation scheme may not initially have primitives, but may evolve into a prlmltive-based scheme by inferring a set of primitive meaning units based on previous experience. | ON THE EXISTENCE OF PRIMITIVE MEANING UNITS Sharon c. Salveter Computer Science Department SUNY Stony Brook Stony Brook . 11794 ABSTRACT Knowledge representation schemes are either based on a set of primitives or not. The decision of whether or not to have a primitive-based scheme Is crucial since It affects the knowledge that Is stored and how that knowledge may be processed. We suggest that a knowledge representation scheme may not Initially have primitives but may evolve Into a primitive-based scheme by Inferring a set of primitive meaning units based on previous experience. We describe a program that Infers Its own primitive set and discuss how the Inferred primitives may affect the organization of existing Information and the subsequent Incorporation of new Information. 1. DECIDING HOW TO REPRESENT KNOWLEDGE A crucial decision In the design of a knowledge representation Is whether to base It on primitives. A primitive-based scheme postulates a pre-defined set of meaning structures combination rules and procedures. The primitives may combine according to the rules Into more complex representational structures the procedures Interpret what those structures mean. A primitive-free scheme on the other hand does not build complex structures from standard building blocks Instead Information is gathered from any available source such as Input and Information In previously built meaning structures. A hybrid approach postulates a small set of pre-defined meaning units that may be used If applicable and convenient but Is not limited to those units. Such a representation scheme Is not truly primitive-based since the word primitive Implies a complete set of pre-defined meaning units that are the only ones available for construction. However we will call this hybrid approach a primitive-based scheme since It does postulate some pre-defined meaning units that are used In the same manner as primitives. 2. WHAT IS A PRIMITIVE All representation systems must have primitives

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