Search Results for author: Oliver Urs Lenz

Found 7 papers, 0 papers with code

A unified weighting framework for evaluating nearest neighbour classification

no code implementations28 Nov 2023 Oliver Urs Lenz, Henri Bollaert, Chris Cornelis

NN and FRNN perform best with a combination of Samworth rank- and distance weights and scaling by the mean absolute deviation around the median ($r_1$), the standard deviaton ($r_2$) or the interquartile range ($r_{\infty}^*$), while FNN performs best with only Samworth distance-weights and $r_1$- or $r_2$-scaling.

Classification Negation

Classifying token frequencies using angular Minkowski $p$-distance

no code implementations25 Sep 2023 Oliver Urs Lenz, Chris Cornelis

Angular Minkowski $p$-distance is a dissimilarity measure that is obtained by replacing Euclidean distance in the definition of cosine dissimilarity with other Minkowski $p$-distances.

Polar Encoding: A Simple Baseline Approach for Classification with Missing Values

no code implementations4 Oct 2022 Oliver Urs Lenz, Daniel Peralta, Chris Cornelis

We propose polar encoding, a representation of categorical and numerical $[0, 1]$-valued attributes with missing values to be used in a classification context.

Attribute Denoising +1

No imputation without representation

no code implementations28 Jun 2022 Oliver Urs Lenz, Daniel Peralta, Chris Cornelis

Imputation allows datasets to be used with algorithms that cannot handle missing values by themselves.

Imputation

Choquet-Based Fuzzy Rough Sets

no code implementations22 Feb 2022 Adnan Theerens, Oliver Urs Lenz, Chris Cornelis

In classical fuzzy rough sets, the lower and upper approximations are determined using the minimum and maximum operators, respectively.

BIG-bench Machine Learning Outlier Detection

Optimised one-class classification performance

no code implementations4 Feb 2021 Oliver Urs Lenz, Daniel Peralta, Chris Cornelis

The hyperparameters of SVM and LOF have to be optimised through cross-validation, while NND, LNND and ALP allow an efficient form of leave-one-out validation and the reuse of a single nearest-neighbour query.

Classification General Classification +1

Average Localised Proximity: A new data descriptor with good default one-class classification performance

no code implementations26 Jan 2021 Oliver Urs Lenz, Daniel Peralta, Chris Cornelis

One-class classification is a challenging subfield of machine learning in which so-called data descriptors are used to predict membership of a class based solely on positive examples of that class, and no counter-examples.

Classification General Classification +1

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