[終了しました] ipi seminar [オンライン開催] 2021年11月30日(火)13：00～14：30
知の物理学研究センター / Institute for Physics of Intelligence (iπ)
Shirley HO（Princeton University）
"Interpreting (some) neural networks with symbolic regression"
We develop a general approach to distill symbolic representations of a learned deep model by introducing strong inductive biases. We focus on Graph Neural Networks (GNNs). The technique works as follows: we first encourage sparse latent representations when we train a GNN in a supervised setting, then we apply symbolic regression to components of the learned model to extract explicit physical relations. We find the correct known equations, including force laws and Hamiltonians, can be extracted from the neural network. We then apply our method to a non-trivial cosmology example—a detailed dark matter simulation—and discover a new analytic formula which can predict the concentration of dark matter from the mass distribution of nearby cosmic structures. Our approach offers alternative directions for interpreting neural networks and discovering novel physical principles from the representations they learn.