Figure 1: A ProtoTree is a globally interpretable model faithfully explaining its entire reasoning (left, partially shown).Additionally, the decision making process for a single prediction can be followed (right): the presence of a red chest and black wing, and the absence of a black stripe near the eye, identifies a Scarlet Tanager. A pruned ProtoTree learns roughly 200 prototypes for CUB (dataset with 200 bird species), making only 8 local decisions on average for one test image.

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