ALHSO - Augmented Lagrangian Harmony Search Optimizer

This code is an extension of the harmony search optimizer [Geem2001] that handles constraints using an augmented Lagrange multiplier approach similar to that implemented in ALPSO. [LICENSE]

class pyALHSO.ALHSO(pll_type=None, *args, **kwargs)

Bases: pyOpt.pyOpt_optimizer.Optimizer

ALHSO Optimizer Class - Inherited from Optimizer Abstract Class

ALHSO Optimizer Class Initialization

Keyword arguments:

• pll_type -> STR: Parallel Implementation (None, ‘POA’-Parallel Objective Analysis), Default = None

Documentation last updated: Feb. 16, 2010 - Peter W. Jansen

__solve__(opt_problem={}, store_sol=True, disp_opts=False, store_hst=False, hot_start=False, *args, **kwargs)

Run Optimizer (Optimize Routine)

Keyword arguments:

• opt_problem -> INST: Optimization instance
• store_sol -> BOOL: Store solution in Optimization class flag, Default = True
• disp_opts -> BOOL: Flag to display options in solution text, Default = False
• store_hst -> BOOL/STR: Flag/filename to store optimization history, Default = False
• hot_start -> BOOL/STR: Flag/filename to read optimization history, Default = False

Additional arguments and keyword arguments are passed to the objective function call.

Documentation last updated: February. 17, 2011 - Peter W. Jansen

Optimizer Options

Name	Type	Default Value	Notes
hms	int	5	Memory Size [1,50]
hmcr	float	0.95	Probability rate of choosing from memory [0.7,0.99]
par	float	0.65	Pitch adjustment rate [0.1,0.99]
dbw	int	2000	Variable Bandwidth Quantization
maxoutiter	int	2e3	Maximum Number of Outer Loop Iterations (Major Iterations)
maxinniter	int	2e2	Maximum Number of Inner Loop Iterations (Minor Iterations)
stopcriteria	int	1	Stopping Criteria Flag
stopiters	int	10	Consecutively Number of Outer Iterations for convergence
etol	float	1e-6	Absolute Tolerance for Equality constraints
itol	float	1e-6	Absolute Tolerance for Inequality constraints
atol	float	1e-6	Absolute Tolerance for Objective Function
rtol	float	1e-6	Relative Tolerance for Objective Function
prtoutiter	int	0	Number of Iterations Before Print Outer Loop Information
prtinniter	int	0	Number of Iterations Before Print Inner Loop Information
xinit	int	0	Initial Position Flag (0 - no position, 1 - position given)
rinit	float	1.0	Initial Penalty Factor
fileout	int	1	Flag to Turn On Output to filename
filename	str	‘ALHSO.out’	Output File Name
seed	float	0	Random Number Seed (0 - Auto-Seed based on time clock)
scaling	int	1	Design Variables Scaling (0- no scaling, 1- scaling [-1,1])