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| package org.sat4j.minisat.orders; |
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| import java.io.PrintStream; |
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| import java.io.Serializable; |
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| import java.util.Random; |
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| |
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| import org.sat4j.minisat.core.ILits; |
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| import org.sat4j.minisat.core.IOrder; |
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| public class VarOrder implements Serializable, IOrder { |
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| private static final long serialVersionUID = 1L; |
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| private static final double VAR_RESCALE_FACTOR = 1e-100; |
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| private static final double VAR_RESCALE_BOUND = 1 / VAR_RESCALE_FACTOR; |
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| protected double[] activity = new double[1]; |
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| protected int lastVar = 1; |
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| protected int[] order = new int[1]; |
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| private double varDecay = 1.0; |
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| private double varInc = 1.0; |
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| protected int[] varpos = new int[1]; |
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| protected ILits lits; |
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| private long nullchoice = 0; |
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| private long randchoice = 0; |
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| private Random rand = new Random(12345); |
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| private final static double RANDOM_WALK = 0.05; |
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2137
| public void setLits(ILits lits) {
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2137
| this.lits = lits;
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| } |
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250626
| public void newVar() {
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250626
| newVar(1);
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| } |
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252278
| public void newVar(int howmany) {
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| } |
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130602264
| public int select() {
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| assert lastVar > 0; |
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130602264
| for (int i = lastVar; i < order.length; i++) {
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| assert i > 0; |
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1967877296
| if (lits.isUnassigned(order[i])) {
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130602263
| lastVar = i;
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130602263
| if (activity[i] < 0.0001) {
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15509425
| nullchoice++;
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| } |
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130602263
| return order[i];
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| } |
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| } |
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1
| return ILits.UNDEFINED;
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| } |
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4242
| public void setVarDecay(double d) {
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4242
| varDecay = d;
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| } |
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| public void undo(int x) { |
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| assert x > 0; |
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| assert x < order.length; |
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| int pos = varpos[x]; |
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| if (pos < lastVar) { |
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3031133
| lastVar = pos;
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| } |
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| assert lastVar > 0; |
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| } |
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| public void updateVar(int p) { |
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| assert p > 1; |
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| final int var = p >> 1; |
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| updateActivity(var); |
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| int i = varpos[var]; |
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2092083337
| for (; i > 1
|
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| && (activity[order[i - 1] >> 1] < activity[var]); i--) { |
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| assert i > 1; |
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| |
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| final int orderpm1 = order[i - 1]; |
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| assert varpos[orderpm1 >> 1] == i - 1; |
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| varpos[orderpm1 >> 1] = i; |
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| order[i] = orderpm1; |
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| } |
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| assert i >= 1; |
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| varpos[var] = i; |
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| order[i] = p; |
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| if (i < lastVar) { |
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125723577
| lastVar = i;
|
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| } |
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| } |
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| protected void updateActivity(final int var) { |
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| if ((activity[var] += varInc) > VAR_RESCALE_BOUND) { |
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17353
| varRescaleActivity();
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| } |
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| } |
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82945129
| public void varDecayActivity() {
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82945129
| varInc *= varDecay;
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| } |
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17353
| private void varRescaleActivity() {
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17353
| for (int i = 1; i < activity.length; i++) {
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1917964
| activity[i] *= VAR_RESCALE_FACTOR;
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| } |
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17353
| varInc *= VAR_RESCALE_FACTOR;
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| } |
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17347341
| public double varActivity(int p) {
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17347341
| return activity[p >> 1];
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| } |
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0
| public int numberOfInterestingVariables() {
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0
| int cpt = 0;
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0
| for (int i = 1; i < activity.length; i++) {
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0
| if (activity[i] > 1.0) {
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0
| cpt++;
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| } |
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| } |
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0
| return cpt;
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| } |
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1981
| public void init() {
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1981
| int nlength = lits.nVars() + 1;
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1981
| int reallength = lits.realnVars()+1;
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1981
| int[] nvarpos = new int[nlength];
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1981
| double[] nactivity = new double[nlength];
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1981
| int[] norder = new int[reallength];
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1981
| nvarpos[0] = -1;
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1981
| nactivity[0] = -1;
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1981
| norder[0] = ILits.UNDEFINED;
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1981
| for (int i = 1,j=1; i < nlength; i++) {
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| assert i > 0; |
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| assert i <= lits.nVars() : "" + lits.nVars() + "/" + i; |
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655771
| if (lits.belongsToPool(i)) {
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655767
| norder[j] = lits.getFromPool(i) ^ 1;
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655767
| nvarpos[i] = j++;
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| } |
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655771
| nactivity[i] = 0.0;
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| } |
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1981
| varpos = nvarpos;
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1981
| activity = nactivity;
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1981
| order = norder;
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1981
| lastVar = 1;
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| } |
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0
| @Override
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| public String toString() { |
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0
| return "VSIDS like heuristics from MiniSAT using a sorted array";
|
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| } |
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0
| public ILits getVocabulary() {
|
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0
| return lits;
|
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| } |
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0
| public void printStat(PrintStream out, String prefix) {
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0
| out.println(prefix + "non guided choices\t" + nullchoice);
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0
| out.println(prefix + "random choices\t" + randchoice);
|
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| } |
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| } |