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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.expressiontransforms;
import com.yahoo.searchdefinition.OnnxModel;
import com.yahoo.searchlib.rankingexpression.rule.Arguments;
import com.yahoo.searchlib.rankingexpression.rule.CompositeNode;
import com.yahoo.searchlib.rankingexpression.rule.ConstantNode;
import com.yahoo.searchlib.rankingexpression.rule.ExpressionNode;
import com.yahoo.searchlib.rankingexpression.rule.ReferenceNode;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
import java.util.List;
/**
* Transforms instances of the onnxModel(model-path, output) ranking feature
* by adding the model file to file distribution and rewriting this feature
* to point to the generated configuration.
*
* @author lesters
*/
public class OnnxModelTransformer extends ExpressionTransformer<RankProfileTransformContext> {
@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("onnxModel")) return feature;
Arguments arguments = feature.getArguments();
if (arguments.isEmpty())
throw new IllegalArgumentException("An onnxModel feature must take an argument pointing to the ONNX file.");
if (arguments.expressions().size() > 2)
throw new IllegalArgumentException("An onnxModel feature can have at most 2 arguments.");
String path = asString(arguments.expressions().get(0));
String name = toModelName(path);
String output = arguments.expressions().size() > 1 ? asString(arguments.expressions().get(1)) : null;
// Validation that the file actually exists is handled when the file is added to file distribution.
// Validation of inputs, outputs and corresponding types are currently handled by RankSetupValidator.
// Add model to config
context.rankProfile().getSearch().onnxModels().add(new OnnxModel(name, path));
// Replace feature with name of config
ExpressionNode argument = new ReferenceNode(name);
return new ReferenceNode("onnxModel", List.of(argument), output);
}
private static String asString(ExpressionNode node) {
if ( ! (node instanceof ConstantNode))
throw new IllegalArgumentException("Expected a constant string as argument, but got '" + node);
return stripQuotes(((ConstantNode)node).sourceString());
}
private static String stripQuotes(String s) {
if ( ! isQuoteSign(s.codePointAt(0))) return s;
if ( ! isQuoteSign(s.codePointAt(s.length() - 1 )))
throw new IllegalArgumentException("argument [" + s + "] is missing endquote");
return s.substring(1, s.length()-1);
}
private static boolean isQuoteSign(int c) {
return c == '\'' || c == '"';
}
public static String toModelName(String path) {
return path.replaceAll("[^\\w\\d\\$@_]", "_");
}
}
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