Search Results for author: Anna Levina

Found 16 papers, 5 papers with code

Learning with 3D rotations, a hitchhiker's guide to SO(3)

1 code implementation17 Apr 2024 A. René Geist, Jonas Frey, Mikel Zobro, Anna Levina, Georg Martius

Many settings in machine learning require the selection of a rotation representation.

Network bottlenecks and task structure control the evolution of interpretable learning rules in a foraging agent

no code implementations20 Mar 2024 Emmanouil Giannakakis, Sina Khajehabdollahi, Anna Levina

Developing reliable mechanisms for continuous local learning is a central challenge faced by biological and artificial systems.

Meta-Learning

Revising clustering and small-worldness in brain networks

no code implementations28 Jan 2024 Tanguy Fardet, Emmanouil Giannakakis, Lukas Paulun, Anna Levina

As more connectome data become available, the question of how to best analyse the structure of biological neural networks becomes increasingly pertinent.

Clustering

Emergent mechanisms for long timescales depend on training curriculum and affect performance in memory tasks

no code implementations22 Sep 2023 Sina Khajehabdollahi, Roxana Zeraati, Emmanouil Giannakakis, Tim Jakob Schäfer, Georg Martius, Anna Levina

We find that for both tasks RNNs develop longer timescales with increasing $N$, but depending on the learning objective, they use different mechanisms.

Available observation time regulates optimal balance between sensitivity and confidence

no code implementations15 Jul 2023 Sahel Azizpour, Viola Priesemann, Johannes Zierenberg, Anna Levina

Tasks that require information about the world imply a trade-off between the time spent on observation and the variance of the response.

The Expressive Leaky Memory Neuron: an Efficient and Expressive Phenomenological Neuron Model Can Solve Long-Horizon Tasks

1 code implementation14 Jun 2023 Aaron Spieler, Nasim Rahaman, Georg Martius, Bernhard Schölkopf, Anna Levina

Biological cortical neurons are remarkably sophisticated computational devices, temporally integrating their vast synaptic input over an intricate dendritic tree, subject to complex, nonlinearly interacting internal biological processes.

16k Classification +4

Locally adaptive cellular automata for goal-oriented self-organization

no code implementations12 Jun 2023 Sina Khajehabdollahi, Emmanouil Giannakakis, Victor Buendia, Georg Martius, Anna Levina

In this paper, we propose a new model class of adaptive cellular automata that allows for the generation of scalable and expressive models.

When to be critical? Performance and evolvability in different regimes of neural Ising agents

no code implementations28 Mar 2023 Sina Khajehabdollahi, Jan Prosi, Emmanouil Giannakakis, Georg Martius, Anna Levina

To test it we introduce a hard and simple task: for the hard task, agents evolve closer to criticality whereas more subcritical solutions are found for the simple task.

Environmental variability and network structure determine the optimal plasticity mechanisms in embodied agents

no code implementations12 Mar 2023 Emmanouil Giannakakis, Sina Khajehabdollahi, Anna Levina

The evolutionary balance between innate and learned behaviors is highly intricate, and different organisms have found different solutions to this problem.

Topology-dependent coalescence controls scaling exponents in finite networks

no code implementations11 Nov 2022 Roxana Zeraati, Victor Buendía, Tatiana A. Engel, Anna Levina

Here we show that distinct empirical exponents arise in networks with different topology and depend on the network size.

Tackling the subsampling problem to infer collective properties from limited data

no code implementations12 Sep 2022 Anna Levina, Viola Priesemann, Johannes Zierenberg

However, despite the development of large-scale data-acquisition techniques, experimental observations are often limited to a tiny fraction of the system.

Spatial and temporal correlations in neural networks with structured connectivity

no code implementations16 Jul 2022 Yan-Liang Shi, Roxana Zeraati, Anna Levina, Tatiana A. Engel

We show that the network dynamics and connectivity jointly define the spatiotemporal profile of neural correlations.

Assessing aesthetics of generated abstract images using correlation structure

no code implementations18 May 2021 Sina Khajehabdollahi, Georg Martius, Anna Levina

We demonstrate that even with the randomly selected weights the correlation functions remain largely determined by the network architecture.

The dynamical regime and its importance for evolvability, task performance and generalization

2 code implementations22 Mar 2021 Jan Prosi, Sina Khajehabdollahi, Emmanouil Giannakakis, Georg Martius, Anna Levina

Surprisingly, we find that all populations, regardless of their initial regime, evolve to be subcritical in simple tasks and even strongly subcritical populations can reach comparable performance.

Tailored ensembles of neural networks optimize sensitivity to stimulus statistics

1 code implementation24 May 2019 Johannes Zierenberg, Jens Wilting, Viola Priesemann, Anna Levina

The dynamic range of stimulus processing in living organisms is much larger than a single neural network can explain.

Disordered Systems and Neural Networks Neurons and Cognition

Description of spreading dynamics by microscopic network models and macroscopic branching processes can differ due to coalescence

1 code implementation24 May 2019 Johannes Zierenberg, Jens Wilting, Viola Priesemann, Anna Levina

Spreading processes are conventionally monitored on a macroscopic level by counting the number of incidences over time.

Neurons and Cognition Disordered Systems and Neural Networks Physics and Society

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