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quantum machine learning

Weights in CQQL

141

Arithmetic Formula on Operands The main idea of [14Ð16] is to apply arithmetical formulas on operands of a disjunction or conjunction. Thus, they all do not fulÞll R4. For example, Sung [13] deÞnes SΘ 1(o), . . . , μn(o), θ1, . . . , θn) = S(θ1μ1(o), . . . , θnμn(o)). Interestingly, the operand formula 1θ (1μ(o)) for the t-norm min proposed by Carson et al. [16] is very near to our evaluation formula on CQQL.

Weighted Sum Singitham et al. [17], Fuhr and Gro§johann [18], and Oracle Corporation [19] propose a weighted sum approach completely independent from a logic. As shown, we can simulate the weighted sum by connected weights.

Logic-Based Weighting Approach on min/max The approaches proposed by Dubois and Prade [20], Pasi [21], and Yager [22] are very similar to our weighting approach and fulÞll R1, R2, R3, and R4. However, they are strictly connected to the t-norm/t-conorm min/max. This results in a problem described by Fagin and Wimmers [4]. First, linearity cannot be fulÞlled. Second, if μ1(o) 1 θ21 μ2(o) holds, then the result is completely independent from μ1(o) and μ2(o).

OWA Approach The OWA approach is discussed, for example, in [9, 23]. It was not developed to weight certain conditions. Instead, the user can assign weights to the highest score, to the second highest score, and so on. As a result, the characteristic of a conjunction can be gradually shifted to one of a disjunction. Thus, the weight does not express the importance of a condition.

We conclude that our weighting approach can be seen as a logic-based generalization of existing weighting approaches.

7 Conclusion

In this paper we propose a logic-based weighting mechanism which is completely embedded in a logic. As logic we used the logic of our query language CQQL. Later, we show that our approach can also be applied to other logics. A very interesting result are connected weights in CQQL. They produce the weighted sum by means of logic.

One problem not tackled here is the question, if a user is always able to specify weight values. We propose to use a kind of user interactions to infer that values. For example, a user starts with equal weight values and is able to adjust them after she/he sees the query result. Another approach is to learn weight values from required preferences over result objects.

We evaluated our approach successfully in a content-based image retrieval context [24]. There, weight values are not given by users but are learnt from user interactions.

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I. Schmitt

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