# Reference

Compare [solvers](<solvers/>), their supported compositions, stopping criteria, and convergence diagnostics. 

The Guide covers [datafits](<../datafits/>), [models](<../models/>), and [penalties](<../penalties/>), together with the shared [modeling conventions](<../modeling>) for loss normalization, penalty scales, intercepts, and predictions. 

See the [Rust API](<https://shrinkage.cc/packages/rust/>) and [Python API](<https://shrinkage.cc/packages/python/>) for signatures.