Solver Options

Solver Statistics

ALTRO logs intermediate values during the course of the solve. These values are all stored in the SolverStats type, accessible via solver.stats or Altro.stats(solver). This currently stores the following information:

Field	Description
iterations	Total number of iterations
iterations_outer	Number of outer loop (Augmented Lagrangian) iterations
iterations_pn	Number of projected newton iterations
iteration	Vector of iteration number
iteration_outer	Vector of outer loop iteration number
cost	Vector of costs
dJ	Change in cost
c_max	Maximum constrained violation
gradient	Approximation of dual optimality residual (2-norm of gradient of the Lagrangian)
penalty_max	Maximum penalty parameter

The other fields are used interally by the solver and not important to the end user.

The vector fields of the SolverStats type can be converted to a dictionary via Dict(stats::SolverStats), which can then be cast into a tabular format such as DataFrame from DataFrames.jl.