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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.rankingexpression.evaluation.gbdtoptimization;
import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.evaluation.ArrayContext;
import com.yahoo.searchlib.rankingexpression.evaluation.DoubleValue;
import com.yahoo.searchlib.rankingexpression.evaluation.ExpressionOptimizer;
import com.yahoo.searchlib.rankingexpression.evaluation.MapContext;
import com.yahoo.searchlib.rankingexpression.evaluation.OptimizationReport;
import com.yahoo.searchlib.rankingexpression.parser.ParseException;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
/**
* @author bratseth
*/
public class GBDTOptimizerTestCase {
private final double delta = 0.00000000001;
@Test
public void testSimpleNodeOptimization() throws ParseException {
RankingExpression gbdt = new RankingExpression("if (a < 2, if (b < 2, 5, 6), 4) + if (a < 3, 7, 8)");
// Optimized evaluation
ArrayContext arguments = new ArrayContext(gbdt);
ExpressionOptimizer optimizer = new ExpressionOptimizer();
optimizer.getOptimizer(GBDTForestOptimizer.class).setEnabled(false);
OptimizationReport report = optimizer.optimize(gbdt,arguments);
assertEquals(2, report.getMetric("Optimized GDBT trees"));
arguments.put("a", 1d);
arguments.put("b", 2d);
assertEquals(13.0, gbdt.evaluate(arguments).asDouble(), delta);
}
@Test
public void testNodeOptimization() throws ParseException {
String gbdtString =
"if (LW_NEWS_SEARCHES_RATIO < 1.72971, 0.0697159, if (LW_USERS < 0.10496, if (SEARCHES < 0.0329127, 0.151257, 0.117501), if (SUGG_OVERLAP < 18.5, 0.0897622, 0.0756903))) + \n" +
"if (LW_NEWS_SEARCHES_RATIO < 1.73156, if (NEWS_USERS < 0.0737993, -0.00481646, 0.00110018), if (LW_USERS < 0.0844616, 0.0488919, if (SUGG_OVERLAP < 32.5, 0.0136917, 9.85328E-4))) + \n" +
"if (LW_NEWS_SEARCHES_RATIO < 1.74451, -0.00298257, if (LW_USERS < 0.116207, if (SEARCHES < 0.0329127, 0.0676105, 0.0340198), if (NUM_WORDS < 1.5, -8.55514E-5, 0.0112406))) + \n" +
"if (LW_NEWS_SEARCHES_RATIO < 1.72995, if (NEWS_USERS < 0.0737993, -0.00407515, 0.00139088), if (LW_USERS == 0.0509035, 0.0439466, if (LW_USERS < 0.325818, 0.0187156, 0.00236949)))";
RankingExpression gbdt = new RankingExpression(gbdtString);
// Regular evaluation
MapContext arguments = new MapContext(DoubleValue.NaN);
arguments.put("LW_NEWS_SEARCHES_RATIO", 1d);
arguments.put("SUGG_OVERLAP", 17d);
double result1 = gbdt.evaluate(arguments).asDouble();
arguments.put("LW_NEWS_SEARCHES_RATIO", 2d);
arguments.put("SUGG_OVERLAP", 20d);
double result2 = gbdt.evaluate(arguments).asDouble();
arguments.put("LW_NEWS_SEARCHES_RATIO", 2d);
arguments.put("SUGG_OVERLAP", 40d);
double result3 = gbdt.evaluate(arguments).asDouble();
// Optimized evaluation
ArrayContext fArguments = new ArrayContext(gbdt, DoubleValue.NaN);
ExpressionOptimizer optimizer = new ExpressionOptimizer();
optimizer.getOptimizer(GBDTForestOptimizer.class).setEnabled(false);
OptimizationReport report = optimizer.optimize(gbdt,fArguments);
assertEquals(4, report.getMetric("Optimized GDBT trees"));
fArguments.put("LW_NEWS_SEARCHES_RATIO", 1d);
fArguments.put("SUGG_OVERLAP", 17d);
double oResult1 = gbdt.evaluate(fArguments).asDouble();
fArguments.put("LW_NEWS_SEARCHES_RATIO", 2d);
fArguments.put("SUGG_OVERLAP", 20d);
double oResult2 = gbdt.evaluate(fArguments).asDouble();
fArguments.put("LW_NEWS_SEARCHES_RATIO", 2d);
fArguments.put("SUGG_OVERLAP", 40d);
double oResult3 = gbdt.evaluate(fArguments).asDouble();
// Assert the same results are produced
assertEquals(result1, oResult1, delta);
assertEquals(result2, oResult2, delta);
assertEquals(result3, oResult3, delta);
}
@Test
public void testFeatureNamesWithDots() throws ParseException {
String gbdtString =
"if (a.b < 1.72971, 0.0697159, if (a.b.c < 0.10496, if (a.c < 0.0329127, 0.151257, 0.117501), if (a < 18.5, 0.0897622, 0.0756903))) + 1";
RankingExpression gbdt = new RankingExpression(gbdtString);
// Regular evaluation
MapContext arguments = new MapContext();
arguments.put("a.b", 1d);
arguments.put("a.b.c", 0.1d);
arguments.put("a.c", 0.01d);
arguments.put("a", 19d);
double result = gbdt.evaluate(arguments).asDouble();
// Optimized evaluation
ArrayContext fArguments = new ArrayContext(gbdt);
OptimizationReport report = new OptimizationReport();
new GBDTOptimizer().optimize(gbdt, fArguments, report);
assertEquals("Optimization result is as expected:\n" + report, 1, report.getMetric("Optimized GDBT trees"));
fArguments.put("a.b", 1d);
fArguments.put("a.b.c", 0.1d);
fArguments.put("a.c", 0.01d);
fArguments.put("a", 19d);
double oResult = gbdt.evaluate(fArguments).asDouble();
// Assert the same results are produced
assertEquals(result, oResult, delta);
}
@Test
public void testBug4009433() throws ParseException {
RankingExpression exp = new RankingExpression("10*if(two>35,if(two>one,if(two>=670,4,8),if(two>8000,5,3)),if(two==478,90,91))");
new GBDTOptimizer().optimize(exp, new ArrayContext(exp), new OptimizationReport());
}
}
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