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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "distance_function.h"
#include "bound_distance_function.h"
#include "distance_function_factory.h"
#include <vespa/eval/eval/typed_cells.h>
#include <vespa/vespalib/hwaccelrated/iaccelrated.h>
namespace search::tensor {
/**
* Calculates inner-product "distance" between vectors assuming a common norm.
* Should give same ordering as Angular distance, but is less expensive.
*/
template <typename FloatType>
class PrenormalizedAngularDistanceFunctionFactory : public DistanceFunctionFactory {
public:
PrenormalizedAngularDistanceFunctionFactory() = default;
BoundDistanceFunction::UP for_query_vector(const vespalib::eval::TypedCells& lhs) override;
BoundDistanceFunction::UP for_insertion_vector(const vespalib::eval::TypedCells& lhs) override;
};
}
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