悲观估计 meaning in English

pessimistic estimate

In the data mining prototype system , apriori algorithm of association rules mining , id3 algorithm of decision tree classification , c4 . 5 pessimism estimate algorithm of decision tree classification and c4 . 5 reduced - error pruning algorithm of decision tree classification are realized
在数据挖掘原型系统中，实现了关联分析的apriori算法、分类的id3决策树算法、 c4 . 5的悲观估计决策树算法和c4 . 5决策树的消除误差修剪算法( reduced - errorpruning ) 。