1 code implementation • 4 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.
1 code implementation • 9 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.
no code implementations • 7 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.
no code implementations • 27 Aug 2021 • Keshav Srinivasan, Nolan Coble, Joy Hamlin, Thomas Antonsen, Edward Ott, Michelle Girvan
Forecasting the dynamics of large complex networks from previous time-series data is important in a wide range of contexts.
no code implementations • 15 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.
no code implementations • 27 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.
no code implementations • 10 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.
1 code implementation • 18 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.
1 code implementation • 9 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.
1 code implementation • 12 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
no code implementations • 9 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.
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.
no code implementations • 19 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
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.
no code implementations • 24 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.
no code implementations • 26 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.
1 code implementation • 7 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