API reference

The library's public surface is re-exported from the top-level hessian_eigenthings package, so from hessian_eigenthings import HessianOperator, lanczos, ... works for everything below.

The reference is split by area: operators are the curvature matrices you can multiply against (Hessian, GGN, Fisher, DDP-aware variants), algorithms are the iterative routines that consume them (Lanczos, power iteration, trace, spectral density), and loss functions are the small helpers for the most common loss-fn shapes.

• Operators →
• Algorithms →
• Loss functions →
• Parameter selection →