湖北文理学院学报
湖北文理學院學報
호북문이학원학보
Journal of Hubei University of Arts and Science
2015年
8期
33-35,71
,共4页
粗糙集%近似算子%分类误差函数%变精度粗糙集
粗糙集%近似算子%分類誤差函數%變精度粗糙集
조조집%근사산자%분류오차함수%변정도조조집
Rough set%Approximate operator%A classification error function%Variable precision rough set
由于对每个等价类的了解程度不同,其错误分类率的上限也不相同,即每一个等价类对应一个错误分类率。通过引入一个错误分类函数得到基于分类误差函数的变精度粗糙集模型;基于分类误差函数的变精度粗糙集模型随着分类误差函数的增大,其下近似算子扩大,上近似算子缩小,边界缩小。并用一个典型例子说明基于分类误差函数的变精度粗糙集模型相对于变精度粗糙集模型其精确度提高了。
由于對每箇等價類的瞭解程度不同,其錯誤分類率的上限也不相同,即每一箇等價類對應一箇錯誤分類率。通過引入一箇錯誤分類函數得到基于分類誤差函數的變精度粗糙集模型;基于分類誤差函數的變精度粗糙集模型隨著分類誤差函數的增大,其下近似算子擴大,上近似算子縮小,邊界縮小。併用一箇典型例子說明基于分類誤差函數的變精度粗糙集模型相對于變精度粗糙集模型其精確度提高瞭。
유우대매개등개류적료해정도불동,기착오분류솔적상한야불상동,즉매일개등개류대응일개착오분류솔。통과인입일개착오분류함수득도기우분류오차함수적변정도조조집모형;기우분류오차함수적변정도조조집모형수착분류오차함수적증대,기하근사산자확대,상근사산자축소,변계축소。병용일개전형례자설명기우분류오차함수적변정도조조집모형상대우변정도조조집모형기정학도제고료。
The upper bound of the error classification rate of each equivalence class is different because of the different understanding of each equivalence class, that is, each equivalence class corresponds to an error classification rate. A variable precision rough set model based on a classification error function is obtained.With the increase of a classification error function, the lower approximate operator expands, the upper approximation operators shrinks, and the border narrows. With a typical example, the accuracy of the variable precision rough set model based on a classification error function is much higher.