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Author
Oriol Ramos Terrades; Albert Berenguel; Debora Gil
Title
A flexible outlier detector based on a topology given by graph communities
Type
Miscellaneous
Year
2020
Publication
Arxiv
Abbreviated Journal
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Abstract
Outlier, or anomaly, detection is essential for optimal performance of machine learning methods and statistical predictive models. It is not just a technical step in a data cleaning process but a key topic in many fields such as fraudulent document detection, in medical applications and assisted diagnosis systems or detecting security threats. In contrast to population-based methods, neighborhood based local approaches are simple flexible methods that have the potential to perform well in small sample size unbalanced problems. However, a main concern of local approaches is the impact that the computation of each sample neighborhood has on the method performance. Most approaches use a distance in the feature space to define a single neighborhood that requires careful selection of several parameters. This work presents a local approach based on a local measure of the heterogeneity of sample labels in the feature space considered as a topological manifold. Topology is computed using the communities of a weighted graph codifying mutual nearest neighbors in the feature space. This way, we provide with a set of multiple neighborhoods able to describe the structure of complex spaces without parameter fine tuning. The extensive experiments on real-world data sets show that our approach overall outperforms, both, local and global strategies in multi and single view settings.
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IAM; DAG; 600.139; 600.145; 600.140; 600.121
Approved
no
Call Number
Admin @ si @ RBG2020
Serial
3475
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Author
Enric Marti; Debora Gil; Marc Vivet; Carme Julia
Title
Uso de recursos virtuales en Aprendizaje Basado en Proyectos. Una experiencia en la asignatura de Gráficos por Computador
Type
Miscellaneous
Year
2009
Publication
15th Jornadas de Enseñanza Universitaria de la Informatica
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Lleida
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Octava Jornada sobre Aprendizaje Cooperativo
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JENUI
Notes
IAM;ADAS
Approved
no
Call Number
IAM @ iam @ MRG2009b
Serial
1597
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