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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.gbdt;
import com.yahoo.searchlib.rankingexpression.evaluation.DoubleValue;
import org.junit.Test;
import java.util.Optional;
import static org.junit.Assert.*;
/**
* @author Simon Thoresen Hult
*/
public class ReferenceNodeTestCase {
@Test
public void requireThatAccessorsWork() {
TreeNode lhs = new ResponseNode(6.0, null);
TreeNode rhs = new ResponseNode(9.0, null);
NumericFeatureNode node = new NumericFeatureNode("foo", new DoubleValue(6.9), null, lhs, rhs);
assertEquals("foo", node.feature());
assertEquals(6.9, node.value().asDouble(), 1E-6);
assertSame(lhs, node.left());
assertSame(rhs, node.right());
}
@Test
public void requireThatRankingExpressionCanBeGenerated() {
assertExpression("if (a < 0.0, b, c)", new NumericFeatureNode("a", new DoubleValue(0), null, new MyNode("b"), new MyNode("c")));
assertExpression("if (d < 1.0, e, f)", new NumericFeatureNode("d", new DoubleValue(1), null, new MyNode("e"), new MyNode("f")));
assertExpression("if (d < 1.0, e, f, 0.5)", new NumericFeatureNode("d", new DoubleValue(1), null, new MyNode("e", 1), new MyNode("f", 1)));
assertExpression("if (d < 1.0, e, f, 0.75)", new NumericFeatureNode("d", new DoubleValue(1), null, new MyNode("e", 3), new MyNode("f", 1)));
}
@Test
public void requireThatNodeCanBeGeneratedFromDomNode() throws Exception {
String xml = "<Node feature='a' value='1'>\n" +
" <Response value='2' />\n" +
" <Response value='4' />\n" +
"</Node>\n";
NumericFeatureNode node = (NumericFeatureNode)FeatureNode.fromDom(XmlHelper.parseXml(xml));
assertEquals("a", node.feature());
assertEquals(1, node.value().asDouble(), 1E-6);
assertTrue(node.left() instanceof ResponseNode);
assertEquals(2, ((ResponseNode)node.left()).value(), 1E-6);
assertTrue(node.right() instanceof ResponseNode);
assertEquals(4, ((ResponseNode)node.right()).value(), 1E-6);
}
@Test
public void requireThatUnknownNodeThrowsException() throws Exception {
String xml = "<Node feature='a' value='1'>\n" +
" <Response value='2' />\n" +
"</Node>\n";
try {
TreeNode.fromDom(XmlHelper.parseXml(xml));
fail();
} catch (IllegalArgumentException e) {
}
xml = "<Node feature='a' value='1'>\n" +
" <Response value='2' />\n" +
" <Response value='4' />\n" +
" <Response value='8' />\n" +
"</Node>\n";
try {
TreeNode.fromDom(XmlHelper.parseXml(xml));
fail();
} catch (IllegalArgumentException e) {
}
}
private static void assertExpression(String expected, TreeNode node) {
assertEquals(expected, node.toRankingExpression());
}
private static class MyNode extends TreeNode {
final String str;
MyNode(String str) {
this(str, Optional.empty());
}
MyNode(String str, int samples) {
super(Optional.of(samples));
this.str = str;
}
MyNode(String str, Optional<Integer> samples) {
super(samples);
this.str = str;
}
@Override
public String toRankingExpression() {
return str;
}
}
}
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