46 ◾ Ac celerat ing Dis cover y
can be readily looked at and evaluated in the space of about an hour. In
one sitting, a thirty-category taxonomy can be generated and thoroughly
edited and comprehended.
For features, imagine we need one feature to dierentiate every cat-
egory from every other category. Each of the 30categories then needs
29dierent features to uniquely identify it. at leads to 870 total fea-
tures needed. You could argue that this count should really be 435, since
the same feature that dierentiates category A from B also dierentiates
category B from A. However, it is not so clear that we want to dene a
category purely as a negation of features that dene other categories, so
we do not rely on this simplication. Of ...