A variational EM acceleration for efficient clustering at very large scales

F Hirschberger, D Forster… - IEEE transactions on …, 2021 - ieeexplore.ieee.org
How can we efficiently find very large numbers of clusters C in very large datasets N of
potentially high dimensionality D? Here we address the question by using a novel …

A sampling-based approach for efficient clustering in large datasets

G Exarchakis, O Oubari, G Lenz - Proceedings of the IEEE …, 2022 - openaccess.thecvf.com
We propose a simple and efficient clustering method for high-dimensional data with a large
number of clusters. Our algorithm achieves high-performance by evaluating distances of …

Can clustering scale sublinearly with its clusters? A variational EM acceleration of GMMs and k-means

D Forster, J Lücke - International Conference on Artificial …, 2018 - proceedings.mlr.press
One iteration of standard k-means (ie, Lloyd's algorithm) or standard EM for Gaussian
mixture models (GMMs) scales linearly with the number of clusters C, data points N, and …

Neural simpletrons: Learning in the limit of few labels with directed generative networks

D Forster, AS Sheikh, J Lücke - Neural computation, 2018 - direct.mit.edu
We explore classifier training for data sets with very few labels. We investigate this task
using a neural network for nonnegative data. The network is derived from a hierarchical …

Truncated variational expectation maximization

J Lücke - arXiv preprint arXiv:1610.03113, 2016 - arxiv.org
We derive a novel variational expectation maximization approach based on truncated
posterior distributions. Truncated distributions are proportional to exact posteriors within …

Models of acetylcholine and dopamine signals differentially improve neural representations

R Holca-Lamarre, J Lücke… - Frontiers in computational …, 2017 - frontiersin.org
Biological and artificial neural networks (ANNs) represent input signals as patterns of neural
activity. In biology, neuromodulators can trigger important reorganizations of these neural …

Efficient spatio-temporal feature clustering for large event-based datasets

O Oubari, G Exarchakis, G Lenz… - Neuromorphic …, 2022 - iopscience.iop.org
Event-based cameras encode changes in a visual scene with high temporal precision and
low power consumption, generating millions of events per second in the process. Current …

Evolutionary expectation maximization

E Guiraud, J Drefs, J Lücke - Proceedings of the Genetic and …, 2018 - dl.acm.org
We establish a link between evolutionary algorithms (EAs) and learning of probabilistic
generative models with binary hidden variables. Learning is formulated as approximate …

Precise timing and computationally efficient learning in neuromorphic systems

O Oubari - 2020 - theses.hal.science
From image recognition to automated driving, machine learning nowadays is all around us
and impacts various aspects of our daily lives. This disruptive technology is rapidly evolving …

[PDF][PDF] Diagnostic tools for assessing hearing impairment across all ages

B Kollmeier - Hören und Lernen - kind-hoerstiftung.de
One particular important complaint by hearing-impaired listeners is their reduced “Cocktail
Party Effect”, ie their inability to understand speech in a noisy environment. There has been …