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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.models.evaluation;
import com.yahoo.searchlib.rankingexpression.ExpressionFunction;
import com.yahoo.searchlib.rankingexpression.Reference;
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.rule.TensorFunctionNode;
import com.yahoo.tensor.functions.DynamicTensor;
import com.yahoo.tensor.functions.Generate;
import com.yahoo.tensor.functions.Slice;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import static com.yahoo.searchlib.rankingexpression.Reference.RANKING_EXPRESSION_WRAPPER;
/**
* extract information about needed bindings, arguments, and onnx models from expression functions
*/
class BindingExtractor {
private final Map<FunctionReference, ExpressionFunction> referencedFunctions;
private final List<OnnxModel> onnxModels;
public BindingExtractor(Map<FunctionReference, ExpressionFunction> referencedFunctions, List<OnnxModel> onnxModels) {
this.referencedFunctions = referencedFunctions;
this.onnxModels = onnxModels;
}
static class FunctionInfo {
/** The names which may be bound externally */
final Set<String> bindTargets = new LinkedHashSet<>();
/** The names which needs to be bound externally, subset of the above */
final Set<String> arguments = new LinkedHashSet<>();
/** ONNX models in use */
final Map<String, OnnxModel> onnxModelsInUse = new LinkedHashMap<>();
void merge(FunctionInfo other) {
bindTargets.addAll(other.bindTargets);
arguments.addAll(other.arguments);
onnxModelsInUse.putAll(other.onnxModelsInUse);
}
void removeTarget(String name) {
bindTargets.remove(name);
arguments.remove(name);
}
}
private final Map<FunctionReference, FunctionInfo> functionsInfo = new LinkedHashMap<>();
FunctionInfo extractFrom(FunctionReference ref) {
if (functionsInfo.containsKey(ref))
return functionsInfo.get(ref);
ExpressionFunction function = referencedFunctions.get(ref);
FunctionInfo result = extractFrom(function);
functionsInfo.put(ref, result);
return result;
}
FunctionInfo extractFrom(ExpressionFunction function) {
if (function == null)
return null;
ExpressionNode functionNode = function.getBody().getRoot();
return extractBindTargets(functionNode);
}
private FunctionInfo extractBindTargets(ExpressionNode node) {
var result = new FunctionInfo();
if (isFunctionReference(node)) {
var opt = FunctionReference.fromSerial(node.toString());
if (opt.isEmpty()) {
throw new IllegalArgumentException("Could not extract function " + node + " from serialized form '" + node.toString() +"'");
}
FunctionReference reference = opt.get();
result.bindTargets.add(reference.serialForm());
FunctionInfo subInfo = extractFrom(reference);
if (subInfo == null) {
// not available, must be supplied as input
result.arguments.add(reference.serialForm());
} else {
result.merge(subInfo);
}
return result;
}
else if (node instanceof TensorFunctionNode tfn) {
for (ExpressionNode child : tfn.children()) {
result.merge(extractBindTargets(child));
}
// ignore return value:
tfn.withTransformedExpressions(expr -> {
result.merge(extractBindTargets(expr));
return expr;
});
var f = tfn.function();
if (f instanceof Generate) {
var tt = f.type(null);
for (var dim : tt.dimensions()) {
result.removeTarget(dim.name());
}
}
return result;
}
else if (isOnnx(node)) {
return extractOnnxTargets(node);
}
else if (isConstant(node)) {
result.bindTargets.add(node.toString());
return result;
}
else if (node instanceof ReferenceNode) {
result.bindTargets.add(node.toString());
result.arguments.add(node.toString());
return result;
}
else if (node instanceof CompositeNode cNode) {
for (ExpressionNode child : cNode.children()) {
result.merge(extractBindTargets(child));
}
return result;
}
if (node instanceof ConstantNode) {
return result;
}
// TODO check if more node types need consideration here
return result;
}
/**
* Extract the feature used to evaluate the onnx model. e.g. onnx(name) and add
* that as a bind target and argument. During evaluation, this will be evaluated before
* the rest of the expression and the result is added to the context. Also extract the
* inputs to the model and add them as bind targets and arguments.
*/
private FunctionInfo extractOnnxTargets(ExpressionNode node) {
var result = new FunctionInfo();
String onnxFeature = node.toString();
result.bindTargets.add(onnxFeature);
Optional<String> modelName = getArgument(node);
if (modelName.isPresent()) {
for (OnnxModel onnxModel : onnxModels) {
if (onnxModel.name().equals(modelName.get())) {
// Load the model (if not already loaded) to extract inputs
onnxModel.load();
for(String input : onnxModel.inputs().keySet()) {
result.bindTargets.add(input);
result.arguments.add(input);
}
result.onnxModelsInUse.put(onnxFeature, onnxModel);
return result;
}
}
}
// not found, must be supplied as argument
result.arguments.add(onnxFeature);
return result;
}
private Optional<String> getArgument(ExpressionNode node) {
if (node instanceof ReferenceNode reference) {
if (reference.getArguments().size() > 0) {
var arg = reference.getArguments().expressions().get(0);
if (arg instanceof ConstantNode) {
return Optional.of(stripQuotes(arg.toString()));
}
if (arg instanceof ReferenceNode refNode) {
return Optional.of(refNode.getName());
}
}
}
return Optional.empty();
}
public static String stripQuotes(String s) {
if (s.length() < 3) {
return s;
}
int lastIdx = s.length() - 1;
char first = s.charAt(0);
char last = s.charAt(lastIdx);
if (first == '"' && last == '"') return s.substring(1, lastIdx);
if (first == '\'' && last == '\'') return s.substring(1, lastIdx);
return s;
}
private boolean isFunctionReference(ExpressionNode node) {
if ( ! (node instanceof ReferenceNode reference)) return false;
return reference.getName().equals(RANKING_EXPRESSION_WRAPPER) && reference.getArguments().size() == 1;
}
private boolean isOnnx(ExpressionNode node) {
if ( ! (node instanceof ReferenceNode reference)) return false;
return reference.getName().equals("onnx") || reference.getName().equals("onnxModel");
}
private boolean isConstant(ExpressionNode node) {
if ( ! (node instanceof ReferenceNode reference)) return false;
return reference.getName().equals("constant") && reference.getArguments().size() == 1;
}
}
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