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(1a)
(1b)
(2a)
(2b)
(3a)
(3b)
Fig. 7.19
Results of the evaluation using the Facebook (
first column
) and LastFM (
second column
)
datasets.
a
Shows the results for users with an unusual music taste,
b
shows the results for users
with popular music taste,
c
shows results over the complete dataset
artist and genres are used for enrichment. This is a shortcoming of the encyclopedic
Freebase dataset as there are no other indicators than distance to the user profile
and degree of a node that could be used. Also, the
standard CF
benefits from the
fact that it is more likely to find similar users in a common taste scenario, hence
recommended items base on the original, not blurred, user profile and the CF can
make use of more neighbors (similar users). On the other hand, a more detailed
look on the results reveals that a combination of the standard and enriched CF can
improve the quality. The reason is that in cases where
standard CF
cannot find
appropriate items because no similar users can be found, enrichment helps to find
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