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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 <vespa/searchlib/fef/blueprint.h>
#include <vespa/searchcommon/attribute/attributecontent.h>
namespace search::features {
/**
* Implements the executor for the eucledian distance feature.
*/
template <typename DataType>
class EuclideanDistanceExecutor : public fef::FeatureExecutor {
public:
using BufferType = search::attribute::AttributeContent<DataType>;
using QueryVectorType = std::vector<DataType>;
private:
const search::attribute::IAttributeVector &_attribute;
const QueryVectorType _vector;
BufferType _attributeBuffer;
feature_t euclideanDistance(const BufferType &v1, const QueryVectorType &v2);
public:
EuclideanDistanceExecutor(const search::attribute::IAttributeVector &attribute, QueryVectorType vector);
void execute(uint32_t docId) override;
};
/**
* Implements the blueprint for the euclidean distance executor.
*/
class EuclideanDistanceBlueprint : public fef::Blueprint {
private:
vespalib::string _attributeName;
vespalib::string _queryVector;
public:
EuclideanDistanceBlueprint();
~EuclideanDistanceBlueprint();
void visitDumpFeatures(const fef::IIndexEnvironment &env, fef::IDumpFeatureVisitor &visitor) const override;
fef::Blueprint::UP createInstance() const override;
fef::ParameterDescriptions getDescriptions() const override {
return fef::ParameterDescriptions().desc().attribute(fef::ParameterCollection::ANY).string();
}
bool setup(const fef::IIndexEnvironment &env, const fef::ParameterList ¶ms) override;
fef::FeatureExecutor &createExecutor(const fef::IQueryEnvironment &env, vespalib::Stash &stash) const override;
};
}
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