ricochet: context and complementarity-aware, ontology-based pois recommender system
TRANSCRIPT
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Ricochet: Context and Complementarity-Aware, Ontology-based POIs Recommender System
Chun Lu, Philippe Laublet, Milan Stankovic
SALAD 2014 May 26th, 2014 Crete, Greece
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Outline � Introduction
� Ricochet system
� Evaluation
� Conclusion
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Introduction � Point of interest (POI)
� Increasing popularity of POIs recommender systems
� Dissatisfaction with recommendations of existing systems
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What’s wrong?
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What’s wrong? � Before & after a check-in,
recommendations remain unchanged.
� Research questions
� User study
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Ricochet System Criteria � Contextual criteria
� Intrinsic criteria
� Criteria of complementarity
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Ricochet System Criteria of complementarity � Each POI category is mapped to a particular
feeling. [Savage et al., 2012] Arts & Entertainment = "feeling artsy" Nightlife = "feeling like a party animal" College & Education = "feeling nerdy" Great Outdoors = "feeling outdoorsy" Food = "feeling hungry" Shops = "feeling shopaholic"
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Ricochet System Criteria of complementarity � Having a certain feeling à Go to a
certain POI � Visit a POI à Having a certain feeling � Just-visited POI causes a feeling � Going-to POI satisfies it
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Ricochet System Criteria of complementarity � Physical activities possess a specific
assessable intensity. [Tapia et al., 2007] � Intensity of expressiveness � Cognitive, emotional, physical � POIs classified into four intensity levels � Daily life = alternation of different intensities
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Ricochet System Sample of OntoPOI
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Ricochet System Recommendation engine � API : Yelp & Jena & Google Maps
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Evaluation � Two versions of Ricochet � Process � Metrics: precision, recall, normalized
Discounted Cumulative Gain
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Results
� The complementarity improves the relevance of the recommendations.
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Conclusion & Future work � Ricochet : improve the relevance by
considering the complementarity
� Refine the complementarity
� Integrate to existing systems
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Questions & Answers Thanks for your attention! Any questions?