net.sf.cpsolver.studentsct.heuristics

Class StudentSctNeighbourSelection

java.lang.Object

net.sf.cpsolver.ifs.heuristics.StandardNeighbourSelection<V,T>

net.sf.cpsolver.ifs.heuristics.RoundRobinNeighbourSelection<Request,Enrollment>

net.sf.cpsolver.studentsct.heuristics.StudentSctNeighbourSelection

All Implemented Interfaces:

NeighbourSelection<Request,Enrollment>

Direct Known Subclasses:

TwoPhaseStudentSctNeighbourSelection

public class StudentSctNeighbourSelection
extends RoundRobinNeighbourSelection<Request,Enrollment>

(Batch) student sectioning neighbour selection. It is based on RoundRobinNeighbourSelection, the following steps are involved:

• Phase 1: section all students using incremental branch & bound (no unassignments) (BranchBoundSelection is used)
• Phase 2: pick a student (one by one) with an incomplete schedule, try to find an improvement (SwapStudentSelection is used)
• Phase 3: use standard value selection for some time ( StandardSelection is used)
• Phase 4: use backtrack neighbour selection (BacktrackSelection is used)
• Phase 5: pick a student (one by one) with an incomplete schedule, try to find an improvement, identify problematic students ( SwapStudentSelection is used)
• Phase 6: random unassignment of some problematic students ( RndUnProblStudSelection is used)
• Phase 7: resection incomplete students ( ResectionIncompleteStudentsSelection is used)
• Phase 8: resection of students that were unassigned in step 6 ( ResectionUnassignedStudentsSelection is used)
• Phase 9: pick a student (one by one) with an incomplete schedule, try to find an improvement (SwapStudentSelection is used)
• Phase 10: use standard value selection for some time ( StandardSelection with RouletteWheelRequestSelection is used)
• Phase 11: pick a student (one by one) with an incomplete schedule, try to find an improvement (SwapStudentSelection is used)
• Phase 12: use backtrack neighbour selection (BacktrackSelection is used)
• Phase 13: random unassignment of some students ( RandomUnassignmentSelection is used)

Version:

StudentSct 1.2 (Student Sectioning)
Copyright (C) 2007 - 2010 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/.

Constructor Summary

Constructors

Constructor and Description
StudentSctNeighbourSelection(DataProperties properties)

Method Summary

Modifier and Type	Method and Description
void	changeSelection(Solution<Request,Enrollment> solution) Change selection
void	init(Solver<Request,Enrollment> solver) Initialization
void	setup(Solver<Request,Enrollment> solver)

Methods inherited from class net.sf.cpsolver.ifs.heuristics.RoundRobinNeighbourSelection

registerSelection, selectNeighbour

Methods inherited from class net.sf.cpsolver.ifs.heuristics.StandardNeighbourSelection

getValueSelection, getVariableSelection, selectValue, selectVariable, setValueSelection, setVariableSelection

Methods inherited from class java.lang.Object

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

Constructor Detail

StudentSctNeighbourSelection

public StudentSctNeighbourSelection(DataProperties properties)
                             throws Exception

Throws:

Exception

Method Detail

init

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

Description copied from class: RoundRobinNeighbourSelection

Initialization

Specified by:

init in interface NeighbourSelection<Request,Enrollment>

Overrides:

init in class RoundRobinNeighbourSelection<Request,Enrollment>

setup

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

changeSelection

public void changeSelection(Solution<Request,Enrollment> solution)

Description copied from class: RoundRobinNeighbourSelection

Change selection

Overrides:

changeSelection in class RoundRobinNeighbourSelection<Request,Enrollment>