org.cpsolver.studentsct.heuristics.selection

Class CriticalCoursesBranchAndBoundSelection

java.lang.Object

org.cpsolver.studentsct.heuristics.selection.BranchBoundSelection

org.cpsolver.studentsct.heuristics.selection.CriticalCoursesBranchAndBoundSelection

All Implemented Interfaces:

NeighbourSelection<Request,Enrollment>, InfoProvider<Request,Enrollment>, SolverListener<Request,Enrollment>

public class CriticalCoursesBranchAndBoundSelection
extends BranchBoundSelection

This selection is very much like BranchBoundSelection, but only critical course requests are assigned (see Request.isCritical(). Students that do not have any unassigned critical courses are skipped.

Parameters:

Related Solver Parameters

Parameter	Type	Comment
Neighbour.CriticalCoursesBranchAndBoundTimeout	Integer	Timeout for each neighbour selection (in milliseconds).
Neighbour.BranchAndBoundMinimizePenalty	Boolean	If true, section penalties (instead of section values) are minimized: overall penalty is minimized together with the maximization of the number of assigned requests and minimization of distance conflicts -- this variant is to better mimic the case when students can choose their sections (section times).

Version:

StudentSct 1.3 (Student Sectioning)
Copyright (C) 2007 - 2014 Tomáš Müller
muller@unitime.org
http://muller.unitime.org

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not see http://www.gnu.org/licenses/.

Author:

Tomáš Müller

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	CriticalCoursesBranchAndBoundSelection.CriticalCoursesSelection

Nested classes/interfaces inherited from class org.cpsolver.studentsct.heuristics.selection.BranchBoundSelection

BranchBoundSelection.BranchBoundNeighbour, BranchBoundSelection.Selection

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	iMPP

Fields inherited from class org.cpsolver.studentsct.heuristics.selection.BranchBoundSelection

iBranchWhenSelectedHasNoConflict, iDistanceConflict, iDistConfWeight, iFilter, iMinimizePenalty, iModel, iNbrIterations, iNbrNoSolution, iNbrStudents, iNbrTimeoutReached, iOrder, iStudentQuality, iStudents, iTimeout, iTimeOverlaps, iTimesToAvoidHeuristics, iTotalTime, sDebug

Constructor Summary

Constructors

Constructor and Description
CriticalCoursesBranchAndBoundSelection(DataProperties properties)
CriticalCoursesBranchAndBoundSelection(DataProperties properties, Request.RequestPriority priority)

Method Summary

Modifier and Type	Method and Description
BranchBoundSelection.Selection	getSelection(Assignment<Request,Enrollment> assignment, Student student) Branch & bound selection for a student
void	init(Solver<Request,Enrollment> solver) Criterion initialization
Neighbour<Request,Enrollment>	selectNeighbour(Solution<Request,Enrollment> solution) Select neighbour.

Methods inherited from class org.cpsolver.studentsct.heuristics.selection.BranchBoundSelection

addStudent, getFilter, getInfo, getInfo, init, neighbourFailed, neighbourSelected, nextStudent, setModel, valueSelected, variableSelected, withFilter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

iMPP

protected boolean iMPP

Constructor Detail

CriticalCoursesBranchAndBoundSelection

public CriticalCoursesBranchAndBoundSelection(DataProperties properties,
                                              Request.RequestPriority priority)

CriticalCoursesBranchAndBoundSelection

public CriticalCoursesBranchAndBoundSelection(DataProperties properties)

Method Detail

init

public void init(Solver<Request,Enrollment> solver)

Description copied from interface: NeighbourSelection

Criterion initialization

Specified by:

init in interface NeighbourSelection<Request,Enrollment>

Overrides:

init in class BranchBoundSelection

Parameters:

solver - current solver

selectNeighbour

public Neighbour<Request,Enrollment> selectNeighbour(Solution<Request,Enrollment> solution)

Description copied from class: BranchBoundSelection

Select neighbour. All students are taken, one by one in a random order. For each student a branch & bound search is employed.

Specified by:

selectNeighbour in interface NeighbourSelection<Request,Enrollment>

Overrides:

selectNeighbour in class BranchBoundSelection

Parameters:

solution - given solution

Returns:

a neighbour assignment

getSelection

public BranchBoundSelection.Selection getSelection(Assignment<Request,Enrollment> assignment,
                                                   Student student)

Description copied from class: BranchBoundSelection

Branch & bound selection for a student

Overrides:

getSelection in class BranchBoundSelection

Parameters:

assignment - current assignment

student - selected student

Returns:

selection