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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.rankingexpression.rule;
import com.yahoo.searchlib.rankingexpression.Reference;
import com.yahoo.searchlib.rankingexpression.evaluation.Context;
import com.yahoo.searchlib.rankingexpression.evaluation.MapContext;
import com.yahoo.searchlib.rankingexpression.evaluation.Value;
import com.yahoo.tensor.TensorType;
import com.yahoo.tensor.evaluation.TypeContext;
import java.util.Collections;
import java.util.Deque;
import java.util.List;
import java.util.Objects;
/**
* A tensor generating function, whose arguments are determined by a tensor type
*
* @author bratseth
*/
public class GeneratorLambdaFunctionNode extends CompositeNode {
private final TensorType type;
private final ExpressionNode generator;
public GeneratorLambdaFunctionNode(TensorType type, ExpressionNode generator) {
if ( ! type.dimensions().stream().allMatch(d -> d.size().isPresent()))
throw new IllegalArgumentException("A tensor generator function can only generate tensors with bound " +
"dimensions, but tried to generate " + type);
// TODO: Verify that the function only accesses the given arguments
this.type = type;
this.generator = generator;
}
/** Returns this as an operator which converts a list of integers into a double. */
public LongListToDoubleLambda asLongListToDoubleOperator() {
return new LongListToDoubleLambda();
}
@Override
public List<ExpressionNode> children() {
return Collections.singletonList(generator);
}
@Override
public CompositeNode setChildren(List<ExpressionNode> children) {
if ( children.size() != 1)
throw new IllegalArgumentException("A lambda function must have a single child expression");
return new GeneratorLambdaFunctionNode(type, children.get(0));
}
@Override
public StringBuilder toString(StringBuilder string, SerializationContext context, Deque<String> path, CompositeNode parent) {
return generator.toString(string, context, path, this);
}
@Override
public TensorType type(TypeContext<Reference> context) { return type; }
/** Evaluate this in a context which must have the arguments bound */
@Override
public Value evaluate(Context context) {
return generator.evaluate(context);
}
@Override
public int hashCode() { return Objects.hash("generator", type, generator); }
private class LongListToDoubleLambda implements java.util.function.Function<List<Long>, Double> {
@Override
public Double apply(List<Long> arguments) {
MapContext context = new MapContext();
for (int i = 0; i < type.dimensions().size(); i++)
context.put(type.dimensions().get(i).name(), arguments.get(i));
return evaluate(context).asDouble();
}
@Override
public String toString() {
return GeneratorLambdaFunctionNode.this.toString();
}
}
}
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