specific head meaning in English

比水头
比压头

After adjusting and revising algorithms proposed by precedent researchers , we develop a constrained adaptive association rule mining ( caarm ) algorithm that can find rule with specific head , and it does not require a given minimum support
论文中采取的是一种能自动调节最小支持度的、受限的关联规则挖掘算法caarm ，该算法是在前人研究的基础上，作了一些调整和改善后得到的。