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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "distance_function.h"
#include "distance_function_factory.h"
#include <vespa/eval/eval/typed_cells.h>
#include <vespa/vespalib/util/typify.h>
#include <cmath>
namespace search::tensor {
/**
* Calculates the Hamming distance defined as
* "number of cells where the values are different"
* or (for int8 cells, aka binary data only)
* "number of bits that are different"
*/
template <typename FloatType>
class HammingDistanceFunctionFactory : public DistanceFunctionFactory {
public:
HammingDistanceFunctionFactory() = 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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