coco
130 lines
3.0 KiB
C++
130 lines
3.0 KiB
C++
// Copyright (C) 2010 Davis E. King (davis@dlib.net)
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// License: Boost Software License See LICENSE.txt for the full license.
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#ifndef DLIB_MR_FUNCTION_ObJECTS_Hh_
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#define DLIB_MR_FUNCTION_ObJECTS_Hh_
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#include "function_objects_abstract.h"
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#include "../matrix.h"
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#include "../svm/sparse_vector.h"
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#include <cmath>
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#include <limits>
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namespace dlib
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{
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// ----------------------------------------------------------------------------------------
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struct squared_euclidean_distance
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{
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squared_euclidean_distance (
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) :
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lower(0),
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upper(std::numeric_limits<double>::infinity())
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{}
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squared_euclidean_distance (
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const double l,
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const double u
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) :
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lower(l),
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upper(u)
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{}
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const double lower;
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const double upper;
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template <typename sample_type>
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double operator() (
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const sample_type& a,
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const sample_type& b
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) const
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{
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const double len = length_squared(a-b);
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if (lower <= len && len <= upper)
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return len;
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else
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return std::numeric_limits<double>::infinity();
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}
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};
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// ----------------------------------------------------------------------------------------
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struct cosine_distance
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{
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template <typename sample_type>
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double operator() (
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const sample_type& a,
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const sample_type& b
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) const
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{
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const double temp = length(a)*length(b);
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if (temp == 0)
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return 0;
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else
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return 1-dot(a,b)/temp;
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}
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};
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// ----------------------------------------------------------------------------------------
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struct negative_dot_product_distance
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{
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template <typename sample_type>
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double operator() (
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const sample_type& a,
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const sample_type& b
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) const
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{
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return -dot(a,b);
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}
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};
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// ----------------------------------------------------------------------------------------
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struct use_weights_of_one
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{
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template <typename edge_type>
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double operator() (
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const edge_type&
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) const
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{
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return 1;
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}
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};
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// ----------------------------------------------------------------------------------------
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struct use_gaussian_weights
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{
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use_gaussian_weights (
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)
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{
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gamma = 0.1;
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}
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use_gaussian_weights (
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double g
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)
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{
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gamma = g;
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}
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double gamma;
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template <typename edge_type>
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double operator() (
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const edge_type& e
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) const
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{
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return std::exp(-gamma*e.distance());
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}
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};
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// ----------------------------------------------------------------------------------------
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}
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#endif // DLIB_MR_FUNCTION_ObJECTS_Hh_
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