Examples with Placement org.cpsolver.coursett.model.Placement used on opensource projects

Example 66 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class SpreadConstraint method computeConflicts.

@Override
public void computeConflicts(Assignment<Lecture, Placement> assignment, Placement placement, Set<Placement> conflicts) {
    SpreadConstraintContext context = getContext(assignment);
    if (context.getUnassignmentsToWeaken() == 0)
        return;
    int penalty = context.getCurrentPenalty() + getPenalty(assignment, placement);
    if (penalty <= context.getMaxAllowedPenalty())
        return;
    int firstSlot = placement.getTimeLocation().getStartSlot();
    if (firstSlot > iLastDaySlot)
        return;
    int endSlot = firstSlot + placement.getTimeLocation().getNrSlotsPerMeeting() - 1;
    if (endSlot < iFirstDaySlot)
        return;
    // sLogger.debug("-- computing conflict for value "+value+" ... (penalty="+iCurrentPenalty+", penalty with the value="+penalty+", max="+iMaxAllowedPenalty+")");
    int[][] nrCourses = new int[iLastDaySlot - iFirstDaySlot + 1][iLastWorkDay - iFirstWorkDay + 1];
    for (int i = 0; i < iLastDaySlot - iFirstDaySlot + 1; i++) for (int j = 0; j < iLastWorkDay - iFirstWorkDay + 1; j++) nrCourses[i][j] = context.getNrCourses(i + iFirstDaySlot, j + iFirstWorkDay, placement);
    tryAssign(assignment, placement, nrCourses);
    // sLogger.debug("  -- nrCurses="+fmt(nrCourses));
    for (Lecture lect : variables()) {
        if (lect.equals(placement.variable()))
            continue;
        if (conflicts.contains(lect)) {
            penalty -= tryUnassign(assignment, assignment.getValue(lect), nrCourses);
        }
        if (penalty <= context.getMaxAllowedPenalty())
            return;
    }
    if (USE_MOST_IMPROVEMENT_ADEPTS) {
        while (penalty > context.getMaxAllowedPenalty()) {
            Placement plac = getAdept(assignment, placement, nrCourses, conflicts);
            if (plac == null)
                break;
            conflicts.add(plac);
            penalty -= tryUnassign(assignment, plac, nrCourses);
        }
    } else {
        if (penalty > context.getMaxAllowedPenalty()) {
            Set<Placement>[] adepts = getAdepts(assignment, placement, nrCourses, conflicts);
            for (int i = 0; penalty > context.getMaxAllowedPenalty() && i < adepts.length; i++) {
                while (!adepts[i].isEmpty() && penalty > context.getMaxAllowedPenalty()) {
                    Placement plac = ToolBox.random(adepts[i]);
                    adepts[i].remove(plac);
                    conflicts.add(plac);
                    // sLogger.debug("  -- conflict "+lect.getAssignment()+" added");
                    penalty -= tryUnassign(assignment, plac, nrCourses);
                }
            }
        }
    }
}

Example 67 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class JenrlConstraint method jenrl.

/**
     * Number of joined enrollments if the given value is assigned to the given
     * variable
     * @param assignment current assignment
     * @param variable a class
     * @param value class placement under consideration
     * @return number of student conflicts caused by this constraint if assigned
     */
public long jenrl(Assignment<Lecture, Placement> assignment, Lecture variable, Placement value) {
    Lecture other = (first().equals(variable) ? second() : first());
    Placement otherPlacement = (other == null ? null : assignment.getValue(other));
    return (otherPlacement != null && isInConflict(value, otherPlacement, getDistanceMetric()) ? Math.round(iJenrl) : 0);
}

Example 68 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class RoomConstraint method computeConflicts.

@Override
public void computeConflicts(Assignment<Lecture, Placement> assignment, Placement placement, Set<Placement> conflicts) {
    if (!getConstraint())
        return;
    if (!placement.hasRoomLocation(getResourceId()))
        return;
    Lecture lecture = placement.variable();
    Placement current = assignment.getValue(lecture);
    boolean canShareRoom = lecture.canShareRoom();
    int size = lecture.maxRoomUse();
    HashSet<Placement> skipPlacements = null;
    BitSet weekCode = placement.getTimeLocation().getWeekCode();
    RoomConstraintContext context = getContext(assignment);
    for (Enumeration<Integer> e = placement.getTimeLocation().getSlots(); e.hasMoreElements(); ) {
        int slot = e.nextElement();
        for (Placement confPlacement : context.getPlacements(slot)) {
            if (!confPlacement.getTimeLocation().shareWeeks(weekCode))
                continue;
            if (confPlacement.equals(current))
                continue;
            Lecture confLecture = confPlacement.variable();
            if (skipPlacements != null && skipPlacements.contains(confPlacement))
                continue;
            if (canShareRoom && confPlacement.canShareRooms(placement) && confLecture.maxRoomUse() + size <= getCapacity()) {
                size += confLecture.maxRoomUse();
                if (skipPlacements == null)
                    skipPlacements = new HashSet<Placement>();
                skipPlacements.add(confPlacement);
                continue;
            }
            conflicts.add(confPlacement);
        }
    }
}

Example 69 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class TimeSwap method resolve.

@Override
public Double resolve(Solution<Lecture, Placement> solution, double total, long startTime, Map<Lecture, Placement> assignments, List<Placement> conflicts, int index) {
    Assignment<Lecture, Placement> assignment = solution.getAssignment();
    if (index == conflicts.size())
        return solution.getModel().getTotalValue(assignment) - total;
    Placement conflict = conflicts.get(index);
    Lecture variable = conflict.variable();
    List<TimeLocation> values = variable.timeLocations();
    if (values.isEmpty())
        return null;
    int valIdx = ToolBox.random(values.size());
    int attempts = 0;
    for (int i = 0; i < values.size(); i++) {
        TimeLocation time = values.get((i + valIdx) % values.size());
        if (time.getPreference() > 50)
            continue;
        if (time.equals(conflict.getTimeLocation()))
            continue;
        Placement value = null;
        if (variable.getNrRooms() == 0)
            value = new Placement(variable, time, (RoomLocation) null);
        else if (variable.getNrRooms() == 1)
            value = new Placement(variable, time, conflict.getRoomLocation());
        else
            value = new Placement(variable, time, conflict.getRoomLocations());
        if (!value.isValid() || solution.getModel().inConflict(assignment, value))
            continue;
        assignment.assign(solution.getIteration(), value);
        Double v = resolve(solution, total, startTime, assignments, conflicts, 1 + index);
        assignment.unassign(solution.getIteration(), variable);
        attempts++;
        if (v != null && (!iHC || v <= 0)) {
            assignments.put(variable, value);
            return v;
        }
        if (attempts >= iMaxAttempts || isTimeLimitReached(startTime))
            break;
    }
    return null;
}

Example 70 with Placement

use of org.cpsolver.coursett.model.Placement in project cpsolver by UniTime.

the class StudentSwap method value.

@Override
public double value(List<StudentConflict> criteria, Assignment<Lecture, Placement> assignment) {
    double delta = 0;
    for (Lecture l1 : iFirstLectures) {
        Placement p1 = assignment.getValue(l1);
        if (p1 == null)
            continue;
        for (Lecture l2 : iFirstStudent.getLectures()) {
            Placement p2 = assignment.getValue(l2);
            if (l1.equals(l2) || p2 == null)
                continue;
            if (iFirstLectures.contains(l2) && l1.getClassId().compareTo(l2.getClassId()) >= 0)
                continue;
            delta -= getJenrConflictWeight(criteria, iFirstStudent, p1, p2);
        }
        if (iSecondStudent != null) {
            for (Lecture l2 : iSecondStudent.getLectures()) {
                if (iSecondLectures.contains(l2))
                    continue;
                Placement p2 = assignment.getValue(l2);
                if (l1.equals(l2) || p2 == null)
                    continue;
                delta += getJenrConflictWeight(criteria, iSecondStudent, p1, p2);
            }
            for (Lecture l2 : iFirstLectures) {
                Placement p2 = assignment.getValue(l2);
                if (l1.equals(l2) || p2 == null)
                    continue;
                if (l1.getClassId().compareTo(l2.getClassId()) >= 0)
                    continue;
                delta += getJenrConflictWeight(criteria, iSecondStudent, p1, p2);
            }
        }
    }
    for (Lecture l1 : iSecondLectures) {
        Placement p1 = assignment.getValue(l1);
        if (p1 == null)
            continue;
        if (iSecondStudent != null) {
            for (Lecture l2 : iSecondStudent.getLectures()) {
                Placement p2 = assignment.getValue(l2);
                if (l1.equals(l2) || p2 == null)
                    continue;
                if (iSecondLectures.contains(l2) && l1.getClassId().compareTo(l2.getClassId()) >= 0)
                    continue;
                delta -= getJenrConflictWeight(criteria, iSecondStudent, p1, p2);
            }
        }
        for (Lecture l2 : iFirstStudent.getLectures()) {
            if (iFirstLectures.contains(l2))
                continue;
            Placement p2 = assignment.getValue(l2);
            if (l1.equals(l2) || p2 == null)
                continue;
            delta += getJenrConflictWeight(criteria, iFirstStudent, p1, p2);
        }
        for (Lecture l2 : iSecondLectures) {
            Placement p2 = assignment.getValue(l2);
            if (l1.equals(l2) || p2 == null)
                continue;
            if (l1.getClassId().compareTo(l2.getClassId()) >= 0)
                continue;
            delta += getJenrConflictWeight(criteria, iFirstStudent, p1, p2);
        }
    }
    return delta;
}