A rapid attribute reduction method for an incomplete data set
A technology of attribute reduction and data set, which is applied in electrical digital data processing, digital data information retrieval, special data processing applications, etc., can solve the problems of slow processing speed and cannot cope with huge time consumption, etc. Efficiently complete attribute reduction and improve the effect of obvious effect
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[0057] The present invention will be further described below in conjunction with the accompanying drawings.
[0058] Given an incomplete decision table IDT=(U,C∪D), get the classification U / SIM(C)={S C (u 1 ), S C (u 2 ),...,S C (u U )}, and the division of the full space U with respect to the decision attribute D U / D={X 1 ,X 2 ,...,X r}. In fact, the division U / D of the decision attribute is expressed in the form of the admissible class corresponding to each object on the full space U, that is, U / SIM(D)={S D (u 1 ), S D (u 2 ),...,S D (u U )}. To ensure its generality, let in Then the relationship between U / D and U / SIM(D) is expressed as follows.
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[0061] According to this relationship, the positive region of an incomplete decision table can be equivalently redefined by the following form.
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[0063] According to the above formulation, the following focuses on the importance of two types of conditional attributes.
[0064...
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