backtracking.py

A few different backtracking line search subsolvers.

BoundsEnforceLS - Only checks bounds and enforces them by one of three methods. ArmijoGoldsteinLS – Like above, but terminates with the ArmijoGoldsteinLS condition.

class openmdao.solvers.linesearch.backtracking.ArmijoGoldsteinLS(**kwargs)[source]

Bases: openmdao.solvers.linesearch.backtracking.LinesearchSolver

Backtracking line search that terminates using the Armijo-Goldstein condition.

Attributes
_analysis_error_raisedbool

Flag is set to True if a subsystem raises an AnalysisError.

SOLVER = 'LS: AG'
__init__(**kwargs)[source]

Initialize all attributes.

Parameters
**kwargsdict

Options dictionary.

add_recorder(recorder)

Add a recorder to the solver’s RecordingManager.

Parameters
recorder<CaseRecorder>

A recorder instance to be added to RecManager.

cleanup()

Clean up resources prior to exit.

property msginfo

Return info to prepend to messages.

Returns
str

Info to prepend to messages.

record_iteration(**kwargs)

Record an iteration of the current Solver.

Parameters
**kwargsdict

Keyword arguments (used for abs and rel error).

solve()

Run the solver.

class openmdao.solvers.linesearch.backtracking.BoundsEnforceLS(**kwargs)[source]

Bases: openmdao.solvers.linesearch.backtracking.LinesearchSolver

Bounds enforcement only.

Not so much a linesearch; just check the bounds and if they are violated, then pull back to a non-violating point and evaluate.

SOLVER = 'LS: BCHK'
__init__(**kwargs)

Initialize all attributes.

Parameters
**kwargsdict

Options dictionary.

add_recorder(recorder)

Add a recorder to the solver’s RecordingManager.

Parameters
recorder<CaseRecorder>

A recorder instance to be added to RecManager.

cleanup()

Clean up resources prior to exit.

property msginfo

Return info to prepend to messages.

Returns
str

Info to prepend to messages.

record_iteration(**kwargs)

Record an iteration of the current Solver.

Parameters
**kwargsdict

Keyword arguments (used for abs and rel error).

solve()

Run the solver.

class openmdao.solvers.linesearch.backtracking.LinesearchSolver(**kwargs)[source]

Bases: openmdao.solvers.solver.NonlinearSolver

Base class for line search solvers.

Attributes
_do_subsolvebool

Flag used by parent solver to tell the line search whether to solve subsystems while backtracking.

_lower_boundsndarray or None

Lower bounds array.

_upper_boundsndarray or None

Upper bounds array.

SOLVER = 'base_solver'
__init__(**kwargs)[source]

Initialize all attributes.

Parameters
**kwargsdict

Options dictionary.

add_recorder(recorder)

Add a recorder to the solver’s RecordingManager.

Parameters
recorder<CaseRecorder>

A recorder instance to be added to RecManager.

cleanup()

Clean up resources prior to exit.

property msginfo

Return info to prepend to messages.

Returns
str

Info to prepend to messages.

record_iteration(**kwargs)

Record an iteration of the current Solver.

Parameters
**kwargsdict

Keyword arguments (used for abs and rel error).

solve()

Run the solver.