SVD perspectives for augmenting DeepONet flexibility and interpretability. (English) Zbl 1536.68020
Summary: Deep operator networks (DeepONets) are powerful and flexible architectures that are attracting attention in multiple fields due to their utility for fast and accurate emulation of complex dynamics. As their remarkable generalization capabilities are primarily enabled by their projection-based attribute, in this paper, we investigate connections with low-rank techniques derived from the singular value decomposition (SVD). We demonstrate that some of the concepts behind proper orthogonal decomposition (POD)-neural networks can improve DeepONet’s design and training phases. These ideas lead us to a methodology extension that we name SVD-DeepONet. Moreover, through multiple SVD analyses of scenario- and time-aggregated snapshots matrices, we find that DeepONet inherits from its projection-based attribute strong inefficiencies in representing dynamics characterized by symmetries. Inspired by the work on shifted-POD, we develop flexDeepONet, an architecture enhancement that relies on a pre-transformation network for generating a moving reference frame and isolating the rigid components of the dynamics. In this way, the physics can be represented on a latent space free from rotations, translations, and stretches, and an accurate projection can be performed to a low-dimensional basis. In addition to improving DeepONet’s flexibility and interpretability, the proposed perspectives increase its generalization capabilities and computational efficiencies. For instance, we show flexDeepONet can accurately surrogate the dynamics of 19 thermodynamic variables in a combustion chemistry application by relying on 95% fewer trainable parameters than that of the ‘vanilla’ architecture. As stressed in the paper, we argue that DeepONet and SVD-based methods can reciprocally benefit from each other. In particular, the flexibility of the former in leveraging multiple data sources and multifidelity knowledge in the form of both unstructured data and physics-informed constraints has the potential to greatly extend the applicability of methodologies such as POD and principal component analysis (PCA).
MSC:
| 68T05 | Learning and adaptive systems in artificial intelligence |
| 68T07 | Artificial neural networks and deep learning |
Software:
DGM; MIONet; PCAfold; GRI-Mech 3.0; DeepONet; Adam; Cantera; TensorFlow; ImprovedDeepONets; GitHubReferences:
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