无类是意为没有常法的一个词语。
支持向量机（SVM）反问题研究的是如何把无类标签的数据集合分成两类才能得到最大的间隔。
The inverse problem of Support Vector Machine (SVM) is how to split the dataset into two clusters so that the margin between the two clusters reaches maximum.
RIP最新的增强版是RIP - 2规范，它允许在RIP报文中包含路由汇总、无类域问路由、变长子网掩码等信息，并提供了简单的认证机制。
The new version of RIP is RIP-2. It allows packets to include such information as routing summary, classless interdomain routing, variable length subnet mask and simple authentication.
陨石进一步细分为两类：球粒状陨石和无球粒陨石。
Aeroliths are further subdivided into two classes: chondrites and achondrites.
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