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Open-source constraint solver.
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/*
* This file is part of choco-solver, http://choco-solver.org/
*
* Copyright (c) 2024, IMT Atlantique. All rights reserved.
*
* Licensed under the BSD 4-clause license.
*
* See LICENSE file in the project root for full license information.
*/
package org.chocosolver.solver.search.measure;
import org.chocosolver.solver.objective.IBoundsManager;
import org.chocosolver.solver.search.SearchState;
import java.io.Serializable;
import java.text.DecimalFormat;
/**
* Interface for providing resolution statistics
*
* @author Charles Prud'Homme, Jean-Guillaume Fages, Arnaud Malapert
*/
public interface IMeasures extends Serializable {
/**
* To transform time from nanoseconds to seconds
*/
float IN_SEC = 1000 * 1000 * 1000f;
/**
* @return name of the model/solver observed
*/
String getModelName();
/**
* @return the current world unique id
*/
long getTimestamp();
/**
* @return the time count (in seconds), including initial propagation time count
*/
default float getTimeCount() {
return getTimeCountInNanoSeconds() / IN_SEC;
}
/**
* @return the time count (in nano seconds), including initial propagation time count
*/
long getTimeCountInNanoSeconds();
/**
* @return the time count (in seconds), including initial propagation time count
*/
default float getTimeToBestSolution() {
return getTimeToBestSolutionInNanoSeconds() / IN_SEC;
}
/**
* @return the time count (in nano seconds), including initial propagation time count
*/
long getTimeToBestSolutionInNanoSeconds();
/**
* @return the reading time count (in sec)
*/
default float getReadingTimeCount() {
return getReadingTimeCountInNanoSeconds() / IN_SEC;
}
/**
* @return the reading time count (in nano seconds).
*/
long getReadingTimeCountInNanoSeconds();
/**
* @return the node count
*/
long getNodeCount();
/**
* @return the backtrack count
*/
long getBackTrackCount();
/**
* @return the fail count
*/
long getFailCount();
/**
* @return the fixpoint count
*/
long getFixpointCount();
/**
* @return the non chronological backtracks count
*/
long getBackjumpCount();
/**
* @return the restart count
*/
long getRestartCount();
/**
* @return the solution count of the measure
*/
long getSolutionCount();
/**
* @return the decision count
*/
long getDecisionCount();
/**
* @return the maximum depth of the search tree
*/
long getMaxDepth();
/**
* @return the current depth in the search tree
*/
long getCurrentDepth();
/**
* @return true iff the problem has an objective variable (i.e. optimization problem)
*/
boolean hasObjective();
/**
* @return true iff the optimum has been found and proved
*/
boolean isObjectiveOptimal();
/**
* @return the objective value of the best solution found (can be Integer or Double)
*/
Number getBestSolutionValue();
/**
* @return the search state
*/
SearchState getSearchState();
/**
* @return current bound manager
*/
IBoundsManager getBoundsManager();
/**
* @return a summary of recorded statistics
*/
default String toOneLineString() {
StringBuilder st = new StringBuilder(256);
st.append("Model[").append(getModelName()).append("], ");
st.append(String.format("%d Solutions, ", getSolutionCount()));
if (hasObjective()) {
st.append(getBoundsManager()).append(", ");
}
st.append(
String.format(
"Resolution time %.3fs, "
+ (hasObjective() ? String.format("Time to best solution %.3fs, ", getTimeToBestSolution()) : "")
+ "%d Nodes (%,.1f n/s), %d Backtracks, %d Backjumps, %d Fails, %d Restarts",
getTimeCount(),
getNodeCount(),
getNodeCount() / getTimeCount(),
getBackTrackCount(),
getBackjumpCount(),
getFailCount(),
getRestartCount()
)
);
return st.toString();
}
default String toDimacsString() {
final StringBuilder st = new StringBuilder(256);
st.append("i ").append(getModelName()).append("\n");
st.append("s ").append(getSearchState()).append("\n");
if (hasObjective()) {
final DecimalFormat df = new DecimalFormat("#.###");
st.append("o ").append(df.format(getBoundsManager().getBestSolutionValue())).append("\n");
}
st.append(String.format("d NBSOLS %d\nd TIME %.3f\nd NODES %d\nd BACKTRACKS %d\nd FAILURES %d\nd RESTARTS %d",
getSolutionCount(), getTimeCount(), getNodeCount(), getBackTrackCount(), getFailCount(), getRestartCount()));
return st.toString();
}
default String toMultiLineString() {
StringBuilder st = new StringBuilder(256);
// st.append("- Search statistics\n");
final long solutionCount = getSolutionCount();
switch (getSearchState()) {
case NEW:
st.append("- Search not started- ");
break;
case RUNNING:
st.append("- Running search - ");
break;
case TERMINATED:
st.append("- Complete search - ");
if (solutionCount == 0) {
st.append("No solution.");
} else if (solutionCount == 1) {
st.append("1 solution found.");
} else {
st.append(String.format("%,d solution(s) found.", solutionCount));
}
st.append('\n');
break;
case STOPPED:
st.append("- Incomplete search - Limit reached.\n");
break;
case KILLED:
st.append("- Incomplete search - Unexpected interruption.\n");
break;
default:
throw new IllegalArgumentException("Illegal search state " + getSearchState());
}
st.append("\tModel[").append(getModelName()).append("]\n");
st.append(String.format("\tSolutions: %,d\n", solutionCount));
if (hasObjective()) {
st.append("\t").append(getBoundsManager()).append(",\n");
}
st.append(
String.format(
"\tBuilding time : %,.3fs\n" +
"\tResolution time : %,.3fs\n" +
(hasObjective() ? String.format("\tTime to best solution : %,.3fs\n",getTimeToBestSolution()) : "") +
"\tNodes: %,d (%,.1f n/s) \n" +
"\tBacktracks: %,d\n" +
"\tBackjumps: %,d\n" +
"\tFails: %,d\n" +
"\tRestarts: %,d",
getReadingTimeCount(),
getTimeCount(),
getNodeCount(),
getNodeCount() / getTimeCount(),
getBackTrackCount(),
getBackjumpCount(),
getFailCount(),
getRestartCount()
)
);
return st.toString();
}
/**
* @return statistic values only
*/
default Number[] toArray() {
return new Number[]{
getSearchState().ordinal(),
getSolutionCount(),
getReadingTimeCount(),
getTimeCount(),
getBoundsManager().getPolicy().ordinal(),
hasObjective() ? getBestSolutionValue() : 0,
getNodeCount(),
getBackTrackCount(),
getFailCount(),
getRestartCount()
};
}
/**
* @return statistics in a CSV format
*/
default String toCSV() {
// solutionCount;buildingTime(sec);totalTime(sec);timeToBest(sec);objective;nodes;backtracks;backjumps;fails;restarts;
return String.format("%c;%d;%.3f;%.3f;%.3f;%d;%d;%d;%d;%d;%d;",
getSearchState().toString().charAt(0),
getSolutionCount(),
getReadingTimeCount(),
getTimeCount(),
getTimeToBestSolution(),
hasObjective() ? getBestSolutionValue().intValue() : 0,
getNodeCount(),
getBackTrackCount(),
getBackjumpCount(),
getFailCount(),
getRestartCount()
);
}
}