net.sf.cpsolver.coursett.heuristics
Class TimetableComparator
java.lang.Object
net.sf.cpsolver.coursett.heuristics.TimetableComparator
- All Implemented Interfaces:
- SolutionComparator
public class TimetableComparator
- extends Object
- implements SolutionComparator
Timetable (solution) comparator.
The quality of a solution is expressed as a weighted sum combining soft time and classroom preferences, satisfied soft
group constrains and the total number of student conflicts. This allows us to express the importance of different
types of soft constraints.
The solution comparator prefers a more complete solution (with a smaller number of unassigned variables) and a solution
with a smaller number of perturbations among solutions with the same number of unassigned variables. If both solutions
have the same number of unassigned variables and perturbations, the solution of better quality is selected.
Parameters:
Parameter | Type | Comment |
Comparator.HardStudentConflictWeight | Double | Weight of hard student conflict (conflict between single-section classes) |
Comparator.StudentConflictWeight | Double | Weight of student conflict |
Comparator.TimePreferenceWeight | Double | Time preferences weight |
Comparator.ContrPreferenceWeight | Double | Group constraint preferences weight |
Comparator.RoomPreferenceWeight | Double | Room preferences weight |
Comparator.UselessSlotWeight | Double | Useless slots weight |
Comparator.TooBigRoomWeight | Double | Too big room weight |
Comparator.DistanceInstructorPreferenceWeight | Double | Distance (of the rooms of the back-to-back classes) based instructor preferences weight |
Comparator.PerturbationPenaltyWeight | Double | Perturbation penalty (see UniversalPerturbationsCounter ) |
Comparator.DeptSpreadPenaltyWeight | Double | Department balancing penalty (see DepartmentSpreadConstraint ) |
- Version:
- CourseTT 1.1 (University Course Timetabling)
Copyright (C) 2006 Tomáš Müller
muller@unitime.org
Lazenska 391, 76314 Zlin, Czech Republic
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 2.1 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
sLogger
protected static Logger sLogger
USELESS_SLOT_WEIGHT
public static final String USELESS_SLOT_WEIGHT
- See Also:
- Constant Field Values
TIME_PREFERENCE_WEIGHT
public static final String TIME_PREFERENCE_WEIGHT
- See Also:
- Constant Field Values
STUDENT_CONFLICT_WEIGHT
public static final String STUDENT_CONFLICT_WEIGHT
- See Also:
- Constant Field Values
ROOM_PREFERENCE_WEIGHT
public static final String ROOM_PREFERENCE_WEIGHT
- See Also:
- Constant Field Values
CONSTR_PREFERENCE_WEIGHT
public static final String CONSTR_PREFERENCE_WEIGHT
- See Also:
- Constant Field Values
HARD_STUDENT_CONFLICT_WEIGHT
public static final String HARD_STUDENT_CONFLICT_WEIGHT
- See Also:
- Constant Field Values
TOO_BIG_ROOM_WEIGHT
public static final String TOO_BIG_ROOM_WEIGHT
- See Also:
- Constant Field Values
DISTANCE_INSTRUCTOR_PREFERENCE_WEIGHT
public static final String DISTANCE_INSTRUCTOR_PREFERENCE_WEIGHT
- See Also:
- Constant Field Values
PERTURBATION_PENALTY_WEIGHT
public static final String PERTURBATION_PENALTY_WEIGHT
- See Also:
- Constant Field Values
DEPT_SPREAD_PENALTY_WEIGHT
public static final String DEPT_SPREAD_PENALTY_WEIGHT
- See Also:
- Constant Field Values
SPREAD_PENALTY_WEIGHT
public static final String SPREAD_PENALTY_WEIGHT
- See Also:
- Constant Field Values
COMMITED_STUDENT_CONFLICT_WEIGHT
public static final String COMMITED_STUDENT_CONFLICT_WEIGHT
- See Also:
- Constant Field Values
TimetableComparator
public TimetableComparator(DataProperties properties)
isBetterThanBestSolution
public boolean isBetterThanBestSolution(Solution currentSolution)
- Description copied from interface:
SolutionComparator
- Compares two solutions. Returns true if the given solution is better than its best ever found solution (see
Solution.saveBest()
and Solution.restoreBest()
).
- Specified by:
isBetterThanBestSolution
in interface SolutionComparator
- Parameters:
currentSolution
- given solution
- Returns:
- true if the given solution is better than the best ever found solution
currentValue
public double currentValue(Solution currentSolution)
currentValue
public double currentValue(TimetableModel tm,
PerturbationsCounter cnt)
currentValue
public double currentValue(TimetableModel tm,
PerturbationsCounter cnt,
Vector variables)
bestValue
public double bestValue(Solution currentSolution)
value
public double value(Placement placement,
PerturbationsCounter cnt)