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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.expressiontransforms;
import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.integration.ml.XgboostImporter;
import com.yahoo.searchlib.rankingexpression.rule.Arguments;
import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
import java.io.UncheckedIOException;
/**
* Replaces instances of the xgboost(model-path)
* pseudofeature with the native Vespa ranking expression implementing
* the same computation.
*
* @author grace-lam
*/
public class XgboostFeatureConverter extends ExpressionTransformer<RankProfileTransformContext> {
private final XgboostImporter xgboostImporter = new XgboostImporter();
@Override
public ExpressionNode transform(ExpressionNode node, RankProfileTransformContext context) {
if (node instanceof ReferenceNode)
return transformFeature((ReferenceNode) node, context);
else if (node instanceof CompositeNode)
return super.transformChildren((CompositeNode) node, context);
else
return node;
}
private ExpressionNode transformFeature(ReferenceNode feature, RankProfileTransformContext context) {
if (!feature.getName().equals("xgboost")) return feature;
try {
ConvertedModel.FeatureArguments arguments = asFeatureArguments(feature.getArguments());
ConvertedModel.ModelStore store = new ConvertedModel.ModelStore(context.rankProfile().getSearch().sourceApplication(),
arguments.modelPath());
RankingExpression expression = xgboostImporter.parseModel(store.modelDir().toString());
return expression.getRoot();
} catch (IllegalArgumentException | UncheckedIOException e) {
throw new IllegalArgumentException("Could not use XGBoost model from " + feature, e);
}
}
private ConvertedModel.FeatureArguments asFeatureArguments(Arguments arguments) {
if (arguments.isEmpty())
throw new IllegalArgumentException("An xgboost node must take an argument pointing to " +
"the xgboost model directory under [application]/models");
if (arguments.expressions().size() > 1)
throw new IllegalArgumentException("An xgboost feature can have at most 1 argument");
return new ConvertedModel.FeatureArguments(arguments);
}
}
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