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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.path.Path;
import com.yahoo.searchlib.rankingexpression.integration.ml.OnnxImporter;
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;
import java.util.HashMap;
import java.util.Map;
/**
* Replaces instances of the onnx(model-path, output)
* pseudofeature with the native Vespa ranking expression implementing
* the same computation.
*
* @author bratseth
* @author lesters
*/
public class OnnxFeatureConverter extends ExpressionTransformer<RankProfileTransformContext> {
/** A cache of imported models indexed by model path. This avoids importing the same model multiple times. */
private final Map<Path, ConvertedModel> convertedModels = new HashMap<>();
private final ImportedModels importedModels = new ImportedModels(new OnnxImporter());
@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("onnx")) return feature;
try {
Path modelPath = Path.fromString(ConvertedModel.FeatureArguments.asString(feature.getArguments().expressions().get(0)));
// TODO: Increase scope of this instance to a rank profile:
ConvertedModel convertedModel = new ConvertedModel(modelPath, context, importedModels, new ConvertedModel.FeatureArguments(feature.getArguments()));
return convertedModel.expression(asFeatureArguments(feature.getArguments()));
}
catch (IllegalArgumentException | UncheckedIOException e) {
throw new IllegalArgumentException("Could not use Onnx model from " + feature, e);
}
}
private ConvertedModel.FeatureArguments asFeatureArguments(Arguments arguments) {
if (arguments.isEmpty())
throw new IllegalArgumentException("An onnx node must take an argument pointing to " +
"the onnx model directory under [application]/models");
if (arguments.expressions().size() > 3)
throw new IllegalArgumentException("An onnx feature can have at most 2 arguments");
return new ConvertedModel.FeatureArguments(arguments);
}
}
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