Adaptive parameters identification for nonlinear dynamics using deep permutation invariant networks

TL;DR

This paper introduces a novel deep set encoding approach, using Set Transformer and Deep Set architectures, to improve real-time adaptive parameter identification in nonlinear dynamical systems, outperforming existing methods like OASIS.

Contribution

The work presents an innovative encoding method based on Set Encoding techniques, enhancing accuracy and adaptability in real-time system identification for complex dynamics.

Findings

Set Transformer outperforms OASIS in Lotka Volterra identification

Deep Set effectively models 1D heat transfer abnormalities

Proposed methods handle variable input lengths efficiently

Abstract

The promising outcomes of dynamical system identification techniques, such as SINDy [Brunton et al. 2016], highlight their advantages in providing qualitative interpretability and extrapolation compared to non-interpretable deep neural networks [Rudin 2019]. These techniques suffer from parameter updating in real-time use cases, especially when the system parameters are likely to change during or between processes. Recently, the OASIS [Bhadriraju et al. 2020] framework introduced a data-driven technique to address the limitations of real-time dynamical system parameters updating, yielding interesting results. Nevertheless, we show in this work that superior performance can be achieved using more advanced model architectures. We present an innovative encoding approach, based mainly on the use of Set Encoding methods of sequence data, which give accurate adaptive model identification for complex dynamic systems, with variable input time series length. Two Set Encoding methods are used, the first is Deep Set [Zaheer et al. 2017], and the second is Set Transformer [Lee et al. 2019]. Comparing Set Transformer to OASIS framework on Lotka Volterra for real-time local dynamical system identification and time series forecasting, we find that the Set Transformer architecture is well adapted to learning relationships within data sets. We then compare the two Set Encoding methods based on the Lorenz system for online global dynamical system identification. Finally, we trained a Deep Set model to perform identification and characterization of abnormalities for 1D heat-transfer problem.