Auflistung nach Autor:in "Baum, Marcus"
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- KonferenzbeitragComparative Evaluation for Recommender Systems for Book Recommendations(Datenbanksysteme für Business, Technologie und Web (BTW 2017) - Workshopband, 2017) Tashkandi, Araek; Wiese, Lena; Baum, MarcusRecommender System (RS) technology is often used to overcome information overload. Recently, several open-source platforms have been available for the development of RSs. Thus, there is a need to estimate the predictive accuracy of such platforms to select a suitable framework. In this paper we perform an offline comparative evaluation of commonly used recommendation algorithms of collaborative filtering. They are implemented by three popular RS platforms (LensKit, Mahout, and MyMediaLite) using the BookCrossing data set containing 1,149,780 user ratings on books. Our main goal is to find out which of these RSs is the most applicable and has high performance and accuracy on these data. We consider performing a fair objective comparison by benchmarking the evaluation dimensions such as the data set and the evaluation metric. Our evaluation shows the disparity of evaluation results between the RS frameworks. This points to the need of standardizing evaluation methodologies for recommendation algorithms.
- KonferenzbeitragExtended object and group tracking: a comparison of random matrices and random hypersurface models(INFORMATIK 2010. Service Science – Neue Perspektiven für die Informatik. Band 2, 2010) Baum, Marcus; Feldmann, Michael; Fränken, Dietrich; Hanebeck, Uwe D.; Koch, WolfgangBased on previous work of the authors, this paper provides a comparison of two different tracking methodologies for extended objects and group targets, where the true shape of the extent is approximated by an ellipsoid. Although both methods exploit usual sensor data, i.e., position measurements of varying scattering centers, the distinctions are a consequence of the different modeling of the extent as a symmetric positive definite random matrix on the one hand and an elliptic random hypersurface model on the other. Besides analyzing the fundamental assumptions and a comparison of the properties of these tracking methods, simulation results are presented based on a static tracking environment to highlight especially the differences in the update step for the extension estimate.
- KonferenzbeitragTracking an extended object modeled as an axis-aligned rectangle(Informatik 2009 – Im Focus das Leben, 2009) Baum, Marcus; Hanebeck, Uwe D.