Trust Networks for Recommender Systems by Patricia Victor, Chris Cornelis, Martine de Cock (auth.)

By Patricia Victor, Chris Cornelis, Martine de Cock (auth.)

This booklet describes learn played within the context of trust/distrust propagation and aggregation, and their use in recommender structures. it is a sizzling study subject with very important implications for varied program parts. the most cutting edge contributions of the paintings are: -new bilattice-based version for belief and mistrust, taking into consideration lack of expertise and inconsistency -proposals for varied propagation and aggregation operators, together with the research of mathematical houses -Evaluation of those operators on actual facts, together with a dialogue at the info units and their features. -A novel process for opting for arguable goods in a recommender approach -An research at the software of together with mistrust in recommender structures -Various techniques for belief dependent options (a.o. base on collaborative filtering), a detailed experimental research, and concept for a hybrid technique -Analysis of varied consumer forms in recommender structures to optimize bootstrapping of chilly begin users.

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7 on average. The total number of users on the other hand well exceeds 100 000 [50]. In other words, a user’s web of trust only contains a very tiny fraction of the user community. Hence, it would be very useful to be able to tap into the knowledge of a larger subset of the user population to generate recommendations. A first step in that direction is propagation. When only dealing with trust, it is reasonable to assume that, if agent a trusts agent b and b trusts agent x, a can trust x to some degree.

In other words, these people do not consider the enemy of their enemy as their friend. A last observation that can be made is with respect to the role of ignorance. A quarter of the subjects showed a coherent behavior when ignorance is involved. , inferring R(a, x)=ignorance). We call this the basic ignorance profile. Fig. 7 Example of the questionnaire about the role of ignorance and distrust in the propagation process. g. g. the effect of positive versus negative recommendations), and involve more participants.

Kd(t, d) = 0. The triangles underneath (in the gray area) contain the consistent trust scores; inconsistent trust scores reside in the upper triangles. The trust score space allows for a widely applicable lightweight trust model that is nevertheless able to preserve a lot of provenance information by simultaneously representing partial trust, partial distrust, partial ignorance and partial inconsistency, and treating them as different, related concepts. Moreover, by using a bilattice model the aforementioned problems disappear: (1) By using trust scores we can now distinguish full distrust (0, 1) from ignorance (0, 0) and analogously, full trust (1, 0) from inconsistency (1, 1).

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