API reference¶ Problem definition Problem Datafits Penalties Solvers Solver sklearn adapters celer adapters Wrapping an arbitrary callable Criteria Criterion CriterionResult HeldOutMSE HeldOutLogistic CrossVal Hypergradient implicit_forward() Outer-search loops grad_search() hoag_search() Result and state dataclasses SolverResult IterationRecord SearchState SearchResult Type aliases Scalar Array Hyperparam DesignMatrix IndexArray The four extension surfaces are documented separately in Protocols & extension points.