MIDACO - Mixed Integer Distributed Ant Colony Optimization

This optimizer implements an extended ant colony optimization to solve non-convex nonlinear programming problems. The algorithm handles constraints using an oracle penalty method. [Schluter2009] [LICENSE]

class pyMIDACO.MIDACO(pll_type=None, *args, **kwargs)

Bases: pyOpt.pyOpt_optimizer.Optimizer

MIDACO Optimizer Class - Inherited from Optimizer Abstract Class

MIDACO 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
ACC	float	0	Accuracy for constraint violation (0 - Use internal default)
ISEED	int	0	Seed for random number generator (0 - Use internal default)
FSTOP	int	0	Objective Function Stopping Value (0 - disabled)
AUTOSTOP	int	0	Automatic stopping criteria (0 - disable, [1,500] - from local to global)
ORACLE	float	0	Oracle parameter for constrained problems (0 - Use internal default)
FOCUS	int	0	Focus of search process around best solution (0 - Use internal default)
ANTS	int	0	Number of iterates (ants) (0 - Use internal default)
KERNEL	int	0	Size of the solution archive (0 - Use internal default)
CHARACTER	int	0	Internal custom parameters (see MIDACO manual for options)
MAXEVAL	int	10000	Maximal function evaluations
MAXTIME	int	86400	Maximal time limit, in seconds
IPRINT	int	1	Output Level (<0 - None, 0 - Screen, 1 - File)
PRINTEVAL	int	10000	Print history after every PRINTEVAL evaluation
IOUT1	int	36	History output unit number
IOUT2	int	37	Best solution output unit number
IFILE1	str	‘MIDACO_HIST.out’	History output file name
IFILE2	str	‘MIDACO_BEST.out’	Best output file name
LKEY	str	‘-‘	License Key (Default - Limited Key)