This is very useful for allowing your users to select efficiently from large lists of data items, but it's also required for items in smaller categories.
这对于用户从很大的数据项列表中有效选择很有用，对于较小类别中的项也是必要的。
Given large data sets, whether they are text or numeric, it is often useful to group together, or cluster, similar items automatically.
对于大型数据集来说，无论它们是文本还是数值，一般都可以将类似的项目自动组织，或集群，到一起。
Such a taxonomy is expected to be particularly useful here, due to the large number of items and the sparseness of data per item (mostly attributed to "tracks" rather than to "artists").
这样的分类是非常有用的，因为条目巨多并且每条数据不全（因为有 "track" 属性而没有 "artists" 属性）。
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