![]() For example, a “healthy” board could start with fitness ideas and eventually evolve into other areas like recipes. The topic of a board tends to change over time as an interest evolves. Figure 2 shows a query Pin of a lion couple cuddling and was saved to the boards “animals” and “wild animals.” As a result, the Related Pins are not exactly cuddling lions, but all kinds of wild animals. Boards are usually created for a broad topic, so Related Pins surfaced using board co-occurrence can be tangentially related. This gap in boards makes it challenging to recommend related drinks for the wine Pin. Someone may save a wine-related idea to a wine board, but cocktails made with wine to a separate cocktails board. Pinners often have multiple boards for one interest. However, board co-occurrence has a few disadvantages: Board co-occurrence provides infinite candidates to recommend: every Pin has been saved to a board, therefore every Pin has at least some Pins we can generate recommendations from. Related Pins for Pin X are generated from all the other Pins saved to the N boards. ![]() For example, Pin X is saved to N boards by many people. For years, Related Pins have been generated using board co-occurrence.
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