Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: MindReader: Recommendation over Knowledge Graph Entities with Explicit
  User Ratings   Knowledge Graphs (KGs) have been integrated in several models of
recommendation to augment the informational value of an item by means of its
related entities in the graph. Yet, existing datasets only provide explicit
ratings on items and no information is provided about user opinions of other
(non-recommendable) entities. To overcome this limitation, we introduce a new
dataset, called the MindReader, providing explicit user ratings both for items
and for KG entities. In this first version, the MindReader dataset provides
more than 102 thousands explicit ratings collected from 1,174 real users on
both items and entities from a KG in the movie domain. This dataset has been
collected through an online interview application that we also release open
source. As a demonstration of the importance of this new dataset, we present a
comparative study of the effect of the inclusion of ratings on non-item KG
entities in a variety of state-of-the-art recommendation models. In particular,
we show that most models, whether designed specifically for graph data or not,
see improvements in recommendation quality when trained on explicit non-item
ratings. Moreover, for some models, we show that non-item ratings can
effectively replace item ratings without loss of recommendation quality. This
finding, thanks also to an observed greater familiarity of users towards common
KG entities than towards long-tail items, motivates the use of KG entities for
both warm and cold-start recommendations.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys