Energy-Based Models
Overview
Energy-based models represent how compatible a data point or configuration is with a task: lower energy generally means greater plausibility, without requiring probabilities to be normalized explicitly. They are trained with methods such as contrastive divergence, noise-contrastive estimation, and score or energy matching, then used for inference and generation with Langevin MCMC, tempering, or diffusion and flow-based samplers. Work spans Boltzmann machines and Hopfield networks as well as image and molecule generation, structured prediction, robotics, and scientific modeling. A central challenge is making sampling and training efficient and reliable; in particular, equilibrium guarantees may not reflect finite-time outputs, and lower energy does not always mean better predictions or reasoning.
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