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Paper: |
Spherinator and HiPSter: Representation Learning for Unbiased Knowledge Discovery from Simulations |
Volume: |
541, ADASS XXXIII |
Page: |
202 |
Authors: |
Kai L. Polsterer; Bernd Doser; Andreas Fehlner; Sebastian Trujillo-Gomez |
DOI: |
10.26624/OHSK9234 |
Abstract: |
Simulations are the best approximation to experimental laboratories in
astrophysics and cosmology. However, the complexity, richness, and large size of their
outputs severely limit the interpretability of their predictions. We describe a new, unbiased, and machine learning based approach to obtaining useful scientific insights from a
broad range of simulations. The method can be used on today’s largest simulations and
will be essential to solve the extreme data exploration and analysis challenges posed
by the Exascale era. Furthermore, this concept is so flexible, that it will also enable
explorative access to observed data.
Our concept is based on applying nonlinear dimensionality reduction to learn
compact representations of the data in a low-dimensional space. The simulation data is
projected onto this space for interactive inspection, visual interpretation, sample selection, and local analysis. We present a prototype using a rotational invariant hyperspherical variational convolutional autoencoder, utilizing a power distribution in the latent
space, and trained on galaxies from IllustrisTNG simulation. Thereby, we obtain a natural Hubble tuning fork like similarity space that can be visualized interactively on the
surface of a sphere by exploiting the power of HiPS tilings in Aladin Lite. |
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