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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.rankingexpression.importer.onnx;
import ai.vespa.rankingexpression.importer.ImportedModel;
import ai.vespa.rankingexpression.importer.IntermediateGraph;
import ai.vespa.rankingexpression.importer.ModelImporter;
import ai.vespa.rankingexpression.importer.configmodelview.ImportedMlModel;
import onnx.Onnx;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* Converts a ONNX model into a ranking expression and set of constants.
*
* @author lesters
*/
public class OnnxImporter extends ModelImporter {
@Override
public boolean canImport(String modelPath) {
File modelFile = new File(modelPath);
if ( ! modelFile.isFile()) return false;
return modelFile.toString().endsWith(".onnx");
}
@Override
public ImportedModel importModel(String modelName, String modelPath) {
try (FileInputStream inputStream = new FileInputStream(modelPath)) {
Onnx.ModelProto model = Onnx.ModelProto.parseFrom(inputStream);
// long version = model.getOpsetImport(0).getVersion(); // opset version
ImportedModel importedModel = new ImportedOnnxModel(modelName, modelPath, model);
for (int i = 0; i < model.getGraph().getOutputCount(); ++i) {
Onnx.ValueInfoProto output = model.getGraph().getOutput(i);
String outputName = asValidIdentifier(output.getName());
importedModel.expression(outputName, "onnx(" + modelName + ")." + outputName);
}
return importedModel;
} catch (IOException e) {
throw new IllegalArgumentException("Could not import ONNX model from '" + modelPath + "'", e);
}
}
public ImportedModel importModelAsNative(String modelName, String modelPath, ImportedMlModel.ModelType modelType) {
try (FileInputStream inputStream = new FileInputStream(modelPath)) {
Onnx.ModelProto model = Onnx.ModelProto.parseFrom(inputStream);
return convertModel(modelName, modelPath, model, modelType);
} catch (IOException e) {
throw new IllegalArgumentException("Could not import ONNX model from '" + modelPath + "'", e);
}
}
public static String asValidIdentifier(String str) {
return str.replaceAll("[^\\w\\d\\$@_]", "_");
}
static ImportedModel convertModel(String name, String source, Onnx.ModelProto modelProto, ImportedMlModel.ModelType modelType) {
IntermediateGraph graph = GraphImporter.importGraph(name, modelProto);
return convertIntermediateGraphToModel(graph, source, modelType);
}
}
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