Deep Machine Learning Reconstructing Lattice Topology with Strong Thermal Fluctuations

TL;DR

This paper demonstrates that deep convolutional neural networks can accurately reconstruct lattice topologies in the kinetic Ising model despite strong thermal fluctuations and unbalanced data, surpassing traditional statistical methods.

Contribution

It introduces a CNN-based method for lattice topology reconstruction that does not require prior knowledge of node dynamics or extensive statistical analysis, effective under high thermal noise.

Findings

CNN achieves accurate reconstruction despite thermal fluctuations.

The method generalizes to unseen initial configurations and lattice types.

It addresses challenges of unbalanced data in large sample spaces.

Abstract

Applying artificial intelligence to scientific problems (namely AI for science) is currently under hot debate. However, the scientific problems differ much from the conventional ones with images, texts, and etc., where new challenges emerges with the unbalanced scientific data and complicated effects from the physical setups. In this work, we demonstrate the validity of the deep convolutional neural network (CNN) on reconstructing the lattice topology (i.e., spin connectivities) in the presence of strong thermal fluctuations and unbalanced data. Taking the kinetic Ising model with Glauber dynamics as an example, the CNN maps the time-dependent local magnetic momenta (a single-node feature) evolved from a specific initial configuration (dubbed as an evolution instance) to the probabilities of the presences of the possible couplings. Our scheme distinguishes from the previous ones that might require the knowledge on the node dynamics, the responses from perturbations, or the evaluations of statistic quantities such as correlations or transfer entropy from many evolution instances. The fine tuning avoids the "barren plateau" caused by the strong thermal fluctuations at high temperatures. Accurate reconstructions can be made where the thermal fluctuations dominate over the correlations and consequently the statistic methods in general fail. Meanwhile, we unveil the generalization of CNN on dealing with the instances evolved from the unlearnt initial spin configurations and those with the unlearnt lattices. We raise an open question on the learning with unbalanced data in the nearly "double-exponentially" large sample space.