knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ > Class Template Reference

Perform a brute-force nearest neighbor search. More...

#include <Bruteforce.hpp>

Inheritance diagram for knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ >:

Collaboration diagram for knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ >:

Public Member Functions
	BruteforceBuilder (std::shared_ptr< const DistanceMetric_ > metric)
Prebuilt< Index_, Data_, Distance_ > *	build_raw (const Matrix_ &data) const
Public Member Functions inherited from knncolle::Builder< Index_, Data_, Distance_, Matrix_ >
std::shared_ptr< Prebuilt< Index_, Data_, Distance_ > >	build_shared (const Matrix_ &data) const
std::unique_ptr< Prebuilt< Index_, Data_, Distance_ > >	build_unique (const Matrix_ &data) const

Detailed Description

template<typename Index_, typename Data_, typename Distance_, class Matrix_ = Matrix<Index_, Data_>, class DistanceMetric_ = DistanceMetric<Data_, Distance_>>
class knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ >

Perform a brute-force nearest neighbor search.

The brute-force search computes all pairwise distances between data and query points to identify nearest neighbors of the latter. It has quadratic complexity and is theoretically the worst-performing method; however, it has effectively no overhead from constructing or querying indexing structures, potentially making it faster in cases where indexing provides little benefit (e.g., few data points, high dimensionality).

Template Parameters

Index_	Integer type for the indices.
Data_	Numeric type for the input and query data.
Distance_	Floating point type for the distances.
Matrix_	Class of the input data matrix. This should satisfy the Matrix interface.
DistanceMetric_	Class implementing the distance metric calculation. This should satisfy the DistanceMetric interface.

Constructor & Destructor Documentation

BruteforceBuilder()

template<typename Index_ , typename Data_ , typename Distance_ , class Matrix_ = Matrix<Index_, Data_>, class DistanceMetric_ = DistanceMetric<Data_, Distance_>>

knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ >::BruteforceBuilder ( std::shared_ptr< const DistanceMetric_ > metric )

inline

Parameters

metric

Pointer to a distance metric instance, e.g., EuclideanDistance.

Member Function Documentation

build_raw()

template<typename Index_ , typename Data_ , typename Distance_ , class Matrix_ = Matrix<Index_, Data_>, class DistanceMetric_ = DistanceMetric<Data_, Distance_>>

Prebuilt< Index_, Data_, Distance_ > * knncolle::BruteforceBuilder< Index_, Data_, Distance_, Matrix_, DistanceMetric_ >::build_raw ( const Matrix_ & data ) const

inlinevirtual

Creates a BruteforcePrebuilt instance.

Implements knncolle::Builder< Index_, Data_, Distance_, Matrix_ >.

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The documentation for this class was generated from the following file:

• knncolle/Bruteforce.hpp