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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.ImmutableSearch;
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 ranking feature and generates
* ONNX configuration if necessary.
*
* @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 (context.rankProfile() == null) return feature;
if (context.rankProfile().getSearch() == null) return feature;
return transformFeature(feature, context.rankProfile().getSearch());
}
public static ReferenceNode transformFeature(ReferenceNode feature, ImmutableSearch search) {
if (!feature.getName().equals("onnxModel")) return feature;
Arguments arguments = feature.getArguments();
if (arguments.isEmpty())
throw new IllegalArgumentException("An onnxModel feature must take an argument referring to a " +
"onnx-model config or a ONNX file.");
if (arguments.expressions().size() > 2)
throw new IllegalArgumentException("An onnxModel feature can have at most 2 arguments.");
// 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.
String modelConfigName;
OnnxModel onnxModel;
if (arguments.expressions().get(0) instanceof ReferenceNode) {
modelConfigName = arguments.expressions().get(0).toString();
onnxModel = search.onnxModels().get(modelConfigName);
if (onnxModel == null) {
throw new IllegalArgumentException("onnxModel argument '" + modelConfigName + "' config not found");
}
} else if (arguments.expressions().get(0) instanceof ConstantNode) {
String path = asString(arguments.expressions().get(0));
modelConfigName = asValidIdentifier(path);
onnxModel = search.onnxModels().get(modelConfigName);
if (onnxModel == null) {
onnxModel = new OnnxModel(modelConfigName, path);
search.onnxModels().add(onnxModel);
}
} else {
throw new IllegalArgumentException("Illegal argument to onnxModel: '" + arguments.expressions().get(0) + "'");
}
String output = null;
if (feature.getOutput() != null) {
output = feature.getOutput();
if ( ! hasOutputMapping(onnxModel, output)) {
onnxModel.addOutputNameMapping(output, output);
}
} else if (arguments.expressions().size() > 1) {
String name = asString(arguments.expressions().get(1));
output = asValidIdentifier(name);
if ( ! hasOutputMapping(onnxModel, output)) {
onnxModel.addOutputNameMapping(name, output);
}
}
// Replace feature with name of config
ExpressionNode argument = new ReferenceNode(modelConfigName);
return new ReferenceNode("onnxModel", List.of(argument), output);
}
private static boolean hasOutputMapping(OnnxModel onnxModel, String as) {
return onnxModel.getOutputMap().stream().anyMatch(m -> m.getVespaName().equals(as));
}
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 == '"';
}
private static String asValidIdentifier(String str) {
return str.replaceAll("[^\\w\\d\\$@_]", "_");
}
}
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