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Conditional preference networks (CP-nets) are used as intuitive graphical tools to represent conditional preference statements regarding the values of a set of attributes. Making use of CP-nets to solve certain learning problems has attracted growing attention from scholars and become a hot topic in the field of artificial intelligence. Therefore, many methods have been proposed to solve these learning problems. However, these approaches suffer from two main disadvantages: the amount of time required and their lack in concrete structures. To overcome these limitations, in this paper, we first provide theoretical support for the use of a conditional independent test for learning the structure of CP-nets. Second, we propose the dependent degree to calculate the dependency relationship among attributes. Finally, we present an algorithm to obtain the structures of CP-nets. Beyond that, a number of database samples have been reduced by filtering out insignificant or noise data, and a concrete structure of learned CP-nets with 18 attributes is given. The experiments show that our approach can obtain a better structure of CP-nets without materially increasing the time required for the process and put forward contrast to methods presented antecedently.

Structure Learning of Conditional Preference Networks Based on Dependent Degree of Attributes From Preference Database