Search Results for author: Michelle Girvan

Found 17 papers, 6 papers with code

Hybridizing Traditional and Next-Generation Reservoir Computing to Accurately and Efficiently Forecast Dynamical Systems

1 code implementation4 Mar 2024 Ravi Chepuri, Dael Amzalag, Thomas Antonsen Jr., Michelle Girvan

Under these conditions, we show for several chaotic systems that the hybrid RC-NGRC method with a small reservoir ($N \approx 100$) can achieve prediction performance rivaling that of a pure RC with a much larger reservoir ($N \approx 1000$), illustrating that the hybrid approach offers significant gains in computational efficiency over traditional RCs while simultaneously addressing some of the limitations of NGRCs.

Computational Efficiency Time Series +2

Stabilizing Machine Learning Prediction of Dynamics: Noise and Noise-inspired Regularization

1 code implementation9 Nov 2022 Alexander Wikner, Joseph Harvey, Michelle Girvan, Brian R. Hunt, Andrew Pomerance, Thomas Antonsen, Edward Ott

In this article, we systematically examine the technique of adding noise to the ML model input during training to promote stability and improve prediction accuracy.

A Meta-learning Approach to Reservoir Computing: Time Series Prediction with Limited Data

no code implementations7 Oct 2021 Daniel Canaday, Andrew Pomerance, Michelle Girvan

Recent research has established the effectiveness of machine learning for data-driven prediction of the future evolution of unknown dynamical systems, including chaotic systems.

Meta-Learning Time Series +1

Using Data Assimilation to Train a Hybrid Forecast System that Combines Machine-Learning and Knowledge-Based Components

no code implementations15 Feb 2021 Alexander Wikner, Jaideep Pathak, Brian R. Hunt, Istvan Szunyogh, Michelle Girvan, Edward Ott

We show that by using partial measurements of the state of the dynamical system, we can train a machine learning model to improve predictions made by an imperfect knowledge-based model.

BIG-bench Machine Learning

Hybrid Backpropagation Parallel Reservoir Networks

no code implementations27 Oct 2020 Matthew Evanusa, Snehesh Shrestha, Michelle Girvan, Cornelia Fermüller, Yiannis Aloimonos

In many real-world applications, fully-differentiable RNNs such as LSTMs and GRUs have been widely deployed to solve time series learning tasks.

EEG Emotion Recognition +4

Combining Machine Learning with Knowledge-Based Modeling for Scalable Forecasting and Subgrid-Scale Closure of Large, Complex, Spatiotemporal Systems

no code implementations10 Feb 2020 Alexander Wikner, Jaideep Pathak, Brian Hunt, Michelle Girvan, Troy Arcomano, Istvan Szunyogh, Andrew Pomerance, Edward Ott

We consider the commonly encountered situation (e. g., in weather forecasting) where the goal is to predict the time evolution of a large, spatiotemporally chaotic dynamical system when we have access to both time series data of previous system states and an imperfect model of the full system dynamics.

BIG-bench Machine Learning Time Series +2

Separation of Chaotic Signals by Reservoir Computing

1 code implementation18 Oct 2019 Sanjukta Krishnagopal, Michelle Girvan, Edward Ott, Brian Hunt

Indeed, our method works well when the component frequency spectra are indistinguishable - a case where a Wiener filter performs essentially no separation.

Backpropagation Algorithms and Reservoir Computing in Recurrent Neural Networks for the Forecasting of Complex Spatiotemporal Dynamics

1 code implementation9 Oct 2019 Pantelis R. Vlachas, Jaideep Pathak, Brian R. Hunt, Themistoklis P. Sapsis, Michelle Girvan, Edward Ott, Petros Koumoutsakos

We examine the efficiency of Recurrent Neural Networks in forecasting the spatiotemporal dynamics of high dimensional and reduced order complex systems using Reservoir Computing (RC) and Backpropagation through time (BPTT) for gated network architectures.

Identifying and Predicting Parkinson's Disease Subtypes through Trajectory Clustering via Bipartite Networks

1 code implementation12 Jun 2019 Sanjukta Krishnagopal, Rainer Von Coelln, Lisa M. Shulman, Michelle Girvan

In summary, using PD as a model for chronic progressive diseases, we show that TPC leverages high-dimensional longitudinal datasets for subtype identification and early prediction of individual disease subtype.

Applications Dynamical Systems Biological Physics Data Analysis, Statistics and Probability

Hybrid Forecasting of Chaotic Processes: Using Machine Learning in Conjunction with a Knowledge-Based Model

no code implementations9 Mar 2018 Jaideep Pathak, Alexander Wikner, Rebeckah Fussell, Sarthak Chandra, Brian Hunt, Michelle Girvan, Edward Ott

A model-based approach to forecasting chaotic dynamical systems utilizes knowledge of the physical processes governing the dynamics to build an approximate mathematical model of the system.

BIG-bench Machine Learning Time Series +2

Generalization of Learning using Reservoir Computing

no code implementations ICLR 2018 Sanjukta Krishnagopal, Yiannis Aloimonos, Michelle Girvan

Thus, as opposed to training the entire high dimensional reservoir state, the reservoir only needs to train on these unique relationships, allowing the reservoir to perform well with very few training examples.

Clustering

Using Machine Learning to Replicate Chaotic Attractors and Calculate Lyapunov Exponents from Data

no code implementations19 Oct 2017 Jaideep Pathak, Zhixin Lu, Brian R. Hunt, Michelle Girvan, Edward Ott

For the case of the KS equation, we note that as the system's spatial size is increased, the number of Lyapunov exponents increases, thus yielding a challenging test of our method, which we find the method successfully passes.

Chaotic Dynamics

Reservoir observers: Model-free inference of unmeasured variables in chaotic systems

no code implementations Chaos 27, 041102 (2017) 2017 Zhixin Lu, Jaideep Pathak, Brian Hunt, Michelle Girvan, Roger Brockett, and Edward Ott

A scheme that accomplishes this is called an “observer.” We consider the case in which a model of the system is unavailable or insufficiently accurate, but “training” time series data of the desired state variables are available for a short period of time, and a limited number of other system variables are continually measured.

Time Series Analysis

The Myopia of Crowds: A Study of Collective Evaluation on Stack Exchange

no code implementations24 Feb 2016 Keith Burghardt, Emanuel F. Alsina, Michelle Girvan, William Rand, Kristina Lerman

Our results suggest that, rather than evaluate all available answers to a question, users rely on simple cognitive heuristics to choose an answer to vote for or accept.

Question Answering

Understanding the Predictive Power of Computational Mechanics and Echo State Networks in Social Media

no code implementations26 Jun 2013 David Darmon, Jared Sylvester, Michelle Girvan, William Rand

There is a large amount of interest in understanding users of social media in order to predict their behavior in this space.

Community structure in social and biological networks

1 code implementation7 Dec 2001 Michelle Girvan, M. E. J. Newman

We also apply the method to two networks whose community structure is not well-known - a collaboration network and a food web - and find that it detects significant and informative community divisions in both cases.

Statistical Mechanics Disordered Systems and Neural Networks

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