pallas::CoolingSchedule Class Reference

Determines the rate of cooling within pallas::SimulatedAnnealing. More...

#include <cooling_schedule.h>

Inheritance diagram for pallas::CoolingSchedule:

Classes
struct	Options

Public Member Functions
virtual	~CoolingSchedule ()
	Default destructor.
virtual void	update_temperature ()=0
	Interface to update the temperature member variable. More...
double	get_temperature () const
	Returns the current temperature stored withing the cooling schedule.
double	get_initial_temperature () const
	Returns the initial temperature to start the minimization at.
void	set_temperature (double T)
	Sets the current temperature. More...
void	calc_start_temperature (const GradientProblem &problem, internal::State &state, StepFunction *step_function)
	Estimates an appropriate starting temperature. More...

Static Public Member Functions
static CoolingSchedule *	Create (const Options &options)
	Creates a pointer to a cooling schedule. More...

Protected Attributes
double	temperature
double	initial_temperature
double	boltzmann_constant

Detailed Description

Determines the rate of cooling within pallas::SimulatedAnnealing.

Member Function Documentation

void pallas::CoolingSchedule::calc_start_temperature	(	const GradientProblem &	problem,
		internal::State &	state,
		StepFunction *	step_function
	)

Estimates an appropriate starting temperature.

If no starting temperature is supplied by the user, this method attempts to approximate an acceptable starting temperature by sampling random points about the starting point in order to gauge the magnitude of the cost function.

Parameters

problem	pallas::GradientProblem. The problem to optimize.
state	pallas::internal::State. The details of the current state of the minimization algorithm.
step_function	pallas::StepFunction. This function produces randomized candidate solutions.

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CoolingSchedule * pallas::CoolingSchedule::Create ( const Options &  options )

static

Creates a pointer to a cooling schedule.

Based on the options the proper cooling schedule, with correct parameters, is returned from this function.

Parameters

options

pallas::CoolingSchedule::Options. Configured options to specify the cooling schedule behaviour.

Returns

pallas::CoolingSchedule*. A pointer to a cooling schedule.

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void pallas::CoolingSchedule::set_temperature

(

double

T

)

Sets the current temperature.

Parameters

T	double. The current temperature to set the cooling schedule at.

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virtual void pallas::CoolingSchedule::update_temperature ( )

pure virtual

Interface to update the temperature member variable.

Should override in derived cooling schedules.

Implemented in pallas::BoltzmannCooling, pallas::CauchyCooling, and pallas::FastCooling.

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Member Data Documentation

double pallas::CoolingSchedule::boltzmann_constant

protected

Initial temperature the cooling schedule should begin at. Boltzmann constant in the probabilistic acceptance criteria (increase for less stringent criteria at each temperature).

double pallas::CoolingSchedule::temperature

protected

Current temperature of the cooling schedule.

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The documentation for this class was generated from the following files:

• include/pallas/cooling_schedule.h
• src/pallas/cooling_schedule.cc