// Copyright (C) 2009 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_SVm_SPARSE_VECTOR
#define DLIB_SVm_SPARSE_VECTOR
#include "sparse_vector_abstract.h"
#include <cmath>
#include <limits>
#include "../algs.h"
#include <vector>
#include <map>
#include "../graph_utils/edge_list_graphs.h"
#include "../matrix.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
template <typename T, typename U>
typename T::value_type::second_type distance_squared (
const T& a,
const U& b
)
{
typedef typename T::value_type::second_type scalar_type;
typedef typename U::value_type::second_type scalar_typeU;
// Both T and U must contain the same kinds of elements
COMPILE_TIME_ASSERT((is_same_type<scalar_type, scalar_typeU>::value));
typename T::const_iterator ai = a.begin();
typename U::const_iterator bi = b.begin();
scalar_type sum = 0, temp = 0;
while (ai != a.end() && bi != b.end())
{
if (ai->first == bi->first)
{
temp = ai->second - bi->second;
++ai;
++bi;
}
else if (ai->first < bi->first)
{
temp = ai->second;
++ai;
}
else
{
temp = bi->second;
++bi;
}
sum += temp*temp;
}
while (ai != a.end())
{
sum += ai->second*ai->second;
++ai;
}
while (bi != b.end())
{
sum += bi->second*bi->second;
++bi;
}
return sum;
}
// ------------------------------------------------------------------------------------
template <typename T, typename U, typename V, typename W>
typename T::value_type::second_type distance_squared (
const V& a_scale,
const T& a,
const W& b_scale,
const U& b
)
{
typedef typename T::value_type::second_type scalar_type;
typedef typename U::value_type::second_type scalar_typeU;
// Both T and U must contain the same kinds of elements
COMPILE_TIME_ASSERT((is_same_type<scalar_type, scalar_typeU>::value));
typename T::const_iterator ai = a.begin();
typename U::const_iterator bi = b.begin();
scalar_type sum = 0, temp = 0;
while (ai != a.end() && bi != b.end())
{
if (ai->first == bi->first)
{
temp = a_scale*ai->second - b_scale*bi->second;
++ai;
++bi;
}
else if (ai->first < bi->first)
{
temp = a_scale*ai->second;
++ai;
}
else
{
temp = b_scale*bi->second;
++bi;
}
sum += temp*temp;
}
while (ai != a.end())
{
sum += a_scale*a_scale*ai->second*ai->second;
++ai;
}
while (bi != b.end())
{
sum += b_scale*b_scale*bi->second*bi->second;
++bi;
}
return sum;
}
// ------------------------------------------------------------------------------------
template <typename T, typename U>
typename T::value_type::second_type distance (
const T& a,
const U& b
)
{
return std::sqrt(distance_squared(a,b));
}
// ------------------------------------------------------------------------------------
template <typename T, typename U, typename V, typename W>
typename T::value_type::second_type distance (
const V& a_scale,
const T& a,
const W& b_scale,
const U& b
)
{
return std::sqrt(distance_squared(a_scale,a,b_scale,b));
}
// ------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------
template <typename T, typename EXP>
typename enable_if<is_matrix<T> >::type assign (
T& dest,
const matrix_exp<EXP>& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(src),
"\t void assign(dest,src)"
<< "\n\t the src matrix must be a row or column vector"
);
dest = src;
}
template <typename T, typename EXP>
typename disable_if<is_matrix<T> >::type assign (
T& dest,
const matrix_exp<EXP>& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(src),
"\t void assign(dest,src)"
<< "\n\t the src matrix must be a row or column vector"
);
dest.clear();
typedef typename T::value_type item_type;
for (long i = 0; i < src.size(); ++i)
{
dest.insert(dest.end(),item_type(i, src(i)));
}
}
template <typename T, typename U>
typename disable_if_c<is_matrix<T>::value || is_matrix<U>::value>::type assign (
T& dest, // sparse
const U& src // sparse
)
{
dest.assign(src.begin(), src.end());
}
template <typename T, typename U, typename Comp, typename Alloc, typename S>
typename disable_if<is_matrix<S> >::type assign (
std::map<T,U,Comp,Alloc>& dest, // sparse
const S& src // sparse
)
{
dest.clear();
dest.insert(src.begin(), src.end());
}
// ------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------
template <typename T>
struct has_unsigned_keys
{
static const bool value = is_unsigned_type<typename T::value_type::first_type>::value;
};
// ------------------------------------------------------------------------------------
namespace impl
{
template <typename T, typename U>
typename T::value_type::second_type general_dot (
const T& a,
const U& b
)
{
typedef typename T::value_type::second_type scalar_type;
typename T::const_iterator ai = a.begin();
typename U::const_iterator bi = b.begin();
scalar_type sum = 0;
while (ai != a.end() && bi != b.end())
{
if (ai->first == bi->first)
{
sum += ai->second * bi->second;
++ai;
++bi;
}
else if (ai->first < bi->first)
{
++ai;
}
else
{
++bi;
}
}
return sum;
}
template <typename T, typename U>
inline typename T::value_type::second_type dot (
const T& a,
const U& b
)
{
return general_dot(a,b);
}
template <typename T, typename U, typename alloc>
U dot (
const std::vector<std::pair<T,U>,alloc>& a,
const std::vector<std::pair<T,U>,alloc>& b
)
{
// You are getting this error because you are attempting to use sparse sample vectors
// but you aren't using an unsigned integer as your key type in the sparse vectors.
COMPILE_TIME_ASSERT(is_unsigned_type<T>::value);
if (a.size() == 0 || b.size() == 0)
return 0;
// if a is really a dense vector but just represented in a sparse container
if (a.back().first == a.size()-1)
{
double sum = 0;
for (unsigned long i = 0; i < b.size(); ++i)
{
if (b[i].first >= a.size())
break;
sum += a[b[i].first].second * b[i].second;
}
return sum;
}
// if b is really a dense vector but just represented in a sparse container
else if (b.back().first == b.size()-1)
{
double sum = 0;
for (unsigned long i = 0; i < a.size(); ++i)
{
if (a[i].first >= b.size())
break;
sum += b[a[i].first].second * a[i].second;
}
return sum;
}
else
{
return general_dot(a,b);
}
}
}
template <typename T>
inline typename T::value_type::second_type dot (
const T& a,
const T& b
)
{
return impl::dot(a,b);
}
template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
inline T4 dot (
const std::vector<T1,T2>& a,
const std::map<T3,T4,T5,T6>& b
)
{
return impl::dot(a,b);
}
template <typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
inline T4 dot (
const std::map<T3,T4,T5,T6>& a,
const std::vector<T1,T2>& b
)
{
return impl::dot(a,b);
}
// ------------------------------------------------------------------------------------
template <typename T, typename EXP>
typename T::value_type::second_type dot (
const T& a,
const matrix_exp<EXP>& b
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(b),
"\t scalar_type dot(sparse_vector a, dense_vector b)"
<< "\n\t 'b' must be a vector to be used in a dot product."
);
typedef typename T::value_type::second_type scalar_type;
typedef typename T::value_type::first_type first_type;
scalar_type sum = 0;
for (typename T::const_iterator ai = a.begin();
(ai != a.end()) && (ai->first < static_cast<first_type>(b.size()));
++ai)
{
sum += ai->second * b(ai->first);
}
return sum;
}
// ------------------------------------------------------------------------------------
template <typename T, typename EXP>
typename T::value_type::second_type dot (
const matrix_exp<EXP>& b,
const T& a
)
{
return dot(a,b);
}
// ------------------------------------------------------------------------------------
template <typename T>
typename T::value_type::second_type length_squared (
const T& a
)
{
typedef typename T::value_type::second_type scalar_type;
typename T::const_iterator i;
scalar_type sum = 0;
for (i = a.begin(); i != a.end(); ++i)
{
sum += i->second * i->second;
}
return sum;
}
// ------------------------------------------------------------------------------------
template <typename T>
typename T::value_type::second_type length (
const T& a
)
{
return std::sqrt(length_squared(a));
}
// ------------------------------------------------------------------------------------
template <typename T, typename U>
typename disable_if<is_matrix<T>,void>::type scale_by (
T& a,
const U& value
)
{
for (typename T::iterator i = a.begin(); i != a.end(); ++i)
{
i->second *= value;
}
}
template <typename T, typename U>
typename enable_if<is_matrix<T>,void>::type scale_by (
T& a,
const U& value
)
{
a *= value;
}
// ------------------------------------------------------------------------------------
template <typename T>
typename disable_if<is_matrix<T>,T>::type add (
const T& a,
const T& b
)
{
T temp;
typename T::const_iterator i = a.begin();
typename T::const_iterator j = b.begin();
while (i != a.end() && j != b.end())
{
if (i->first == j->first)
{
temp.insert(temp.end(), std::make_pair(i->first, i->second + j->second));
++i;
++j;
}
else if (i->first < j->first)
{
temp.insert(temp.end(), *i);
++i;
}
else
{
temp.insert(temp.end(), *j);
++j;
}
}
while (i != a.end())
{
temp.insert(temp.end(), *i);
++i;
}
while (j != b.end())
{
temp.insert(temp.end(), *j);
++j;
}
return temp;
}
template <typename T, typename U>
typename enable_if_c<is_matrix<T>::value && is_matrix<U>::value, matrix_add_exp<T,U> >::type add (
const T& a,
const U& b
)
{
return matrix_add_exp<T,U>(a.ref(),b.ref());
}
// ------------------------------------------------------------------------------------
template <typename T>
typename disable_if<is_matrix<T>,T>::type subtract (
const T& a,
const T& b
)
{
T temp;
typename T::const_iterator i = a.begin();
typename T::const_iterator j = b.begin();
while (i != a.end() && j != b.end())
{
if (i->first == j->first)
{
temp.insert(temp.end(), std::make_pair(i->first, i->second - j->second));
++i;
++j;
}
else if (i->first < j->first)
{
temp.insert(temp.end(), *i);
++i;
}
else
{
temp.insert(temp.end(), std::make_pair(j->first, -j->second));
++j;
}
}
while (i != a.end())
{
temp.insert(temp.end(), *i);
++i;
}
while (j != b.end())
{
temp.insert(temp.end(), std::make_pair(j->first, -j->second));
++j;
}
return temp;
}
template <typename T, typename U>
typename enable_if_c<is_matrix<T>::value && is_matrix<U>::value, matrix_subtract_exp<T,U> >::type subtract (
const T& a,
const U& b
)
{
return matrix_subtract_exp<T,U>(a.ref(),b.ref());
}
// ------------------------------------------------------------------------------------
// ------------------------------------------------------------------------------------
namespace impl
{
template <typename T>
typename enable_if<is_matrix<typename T::type>,unsigned long>::type max_index_plus_one (
const T& samples
)
{
if (samples.size() > 0)
return samples(0).size();
else
return 0;
}
template <typename T>
typename enable_if<is_built_in_scalar_type<typename T::type>,unsigned long>::type max_index_plus_one (
const T& sample
)
{
return sample.size();
}
// This !is_built_in_scalar_type<typename T::type>::value is here to avoid an inexplicable bug in Vistual Studio 2005
template <typename T>
typename enable_if_c<(!is_built_in_scalar_type<typename T::type>::value) && (is_pair<typename T::type::value_type>::value) ,unsigned long>::type
max_index_plus_one (
const T& samples
)
{
typedef typename T::type sample_type;
// You are getting this error because you are attempting to use sparse sample vectors
// but you aren't using an unsigned integer as your key type in the sparse vectors.
COMPILE_TIME_ASSERT(has_unsigned_keys<sample_type>::value);
// these should be sparse samples so look over all them to find the max index.
unsigned long max_dim = 0;
for (long i = 0; i < samples.size(); ++i)
{
if (samples(i).size() > 0)
max_dim = std::max<unsigned long>(max_dim, (--samples(i).end())->first + 1);
}
return max_dim;
}
}
template <typename T>
typename enable_if<is_pair<typename T::value_type>,unsigned long>::type max_index_plus_one (
const T& sample
)
{
if (sample.size() > 0)
return (--sample.end())->first + 1;
return 0;
}
template <typename T>
typename disable_if_c<is_pair<typename T::value_type>::value ||
is_same_type<typename T::value_type,sample_pair>::value ||
is_same_type<typename T::value_type,ordered_sample_pair>::value , unsigned long>::type
max_index_plus_one (
const T& samples
)
{
return impl::max_index_plus_one(mat(samples));
}
// ------------------------------------------------------------------------------------
template <typename T, long NR, long NC, typename MM, typename L, typename EXP>
inline void add_to (
matrix<T,NR,NC,MM,L>& dest,
const matrix_exp<EXP>& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void add_to(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (long r = 0; r < src.size(); ++r)
dest(r) += src(r);
}
template <typename T, long NR, long NC, typename MM, typename L, typename EXP>
inline typename disable_if<is_matrix<EXP> >::type add_to (
matrix<T,NR,NC,MM,L>& dest,
const EXP& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void add_to(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (typename EXP::const_iterator i = src.begin(); i != src.end(); ++i)
dest(i->first) += i->second;
}
// ------------------------------------------------------------------------------------
template <typename T, long NR, long NC, typename MM, typename L, typename EXP, typename U>
inline void add_to (
matrix<T,NR,NC,MM,L>& dest,
const matrix_exp<EXP>& src,
const U& C
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void add_to(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (long r = 0; r < src.size(); ++r)
dest(r) += C*src(r);
}
template <typename T, long NR, long NC, typename MM, typename L, typename EXP, typename U>
inline typename disable_if<is_matrix<EXP> >::type add_to (
matrix<T,NR,NC,MM,L>& dest,
const EXP& src,
const U& C
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void add_to(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (typename EXP::const_iterator i = src.begin(); i != src.end(); ++i)
dest(i->first) += C*i->second;
}
// ------------------------------------------------------------------------------------
template <typename T, long NR, long NC, typename MM, typename L, typename EXP>
inline void subtract_from (
matrix<T,NR,NC,MM,L>& dest,
const matrix_exp<EXP>& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void subtract_from(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (long r = 0; r < src.size(); ++r)
dest(r) -= src(r);
}
template <typename T, long NR, long NC, typename MM, typename L, typename EXP>
inline typename disable_if<is_matrix<EXP> >::type subtract_from (
matrix<T,NR,NC,MM,L>& dest,
const EXP& src
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void subtract_from(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (typename EXP::const_iterator i = src.begin(); i != src.end(); ++i)
dest(i->first) -= i->second;
}
// ------------------------------------------------------------------------------------
template <typename T, long NR, long NC, typename MM, typename L, typename EXP, typename U>
inline void subtract_from (
matrix<T,NR,NC,MM,L>& dest,
const matrix_exp<EXP>& src,
const U& C
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void subtract_from(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (long r = 0; r < src.size(); ++r)
dest(r) -= C*src(r);
}
template <typename T, long NR, long NC, typename MM, typename L, typename EXP, typename U>
inline typename disable_if<is_matrix<EXP> >::type subtract_from (
matrix<T,NR,NC,MM,L>& dest,
const EXP& src,
const U& C
)
{
// make sure requires clause is not broken
DLIB_ASSERT(is_vector(dest) && max_index_plus_one(src) <= static_cast<unsigned long>(dest.size()),
"\t void subtract_from(dest,src)"
<< "\n\t dest must be a vector large enough to hold the src vector."
<< "\n\t is_vector(dest): " << is_vector(dest)
<< "\n\t max_index_plus_one(src): " << max_index_plus_one(src)
<< "\n\t dest.size(): " << dest.size()
);
for (typename EXP::const_iterator i = src.begin(); i != src.end(); ++i)
dest(i->first) -= C*i->second;
}
// ------------------------------------------------------------------------------------
template <typename T>
typename T::value_type::second_type min (
const T& a
)
{
typedef typename T::value_type::second_type type;
type temp = 0;
for (typename T::const_iterator i = a.begin(); i != a.end(); ++i)
{
if (temp > i->second)
temp = i->second;
}
return temp;
}
// ------------------------------------------------------------------------------------
template <typename T>
typename T::value_type::second_type max (
const T& a
)
{
typedef typename T::value_type::second_type type;
type temp = 0;
for (typename T::const_iterator i = a.begin(); i != a.end(); ++i)
{
if (temp < i->second)
temp = i->second;
}
return temp;
}
// ----------------------------------------------------------------------------------------
namespace impl
{
template <typename sparse_vector_type>
inline matrix<typename sparse_vector_type::value_type::second_type,0,1> sparse_to_dense (
const sparse_vector_type& vect,
unsigned long num_dimensions
)
{
// You must use unsigned integral key types in your sparse vectors
typedef typename sparse_vector_type::value_type::first_type idx_type;
typedef typename sparse_vector_type::value_type::second_type value_type;
COMPILE_TIME_ASSERT(is_unsigned_type<idx_type>::value);
matrix<value_type,0,1> result;
if (vect.size() == 0)
return result;
result.set_size(num_dimensions);
result = 0;
for (typename sparse_vector_type::const_iterator j = vect.begin(); j != vect.end(); ++j)
{
if ((long)(j->first) < result.size())
{
result(j->first) += j->second;
}
}
return result;
}
}
// ----------------------------------------------------------------------------------------
template <typename idx_type, typename value_type, typename alloc>
matrix<value_type,0,1> sparse_to_dense (
const std::vector<std::pair<idx_type,value_type>,alloc>& vect,
unsigned long num_dimensions
)
{
return impl::sparse_to_dense(vect,num_dimensions);
}
// ----------------------------------------------------------------------------------------
template <typename idx_type, typename value_type, typename alloc>
matrix<value_type,0,1> sparse_to_dense (
const std::vector<std::pair<idx_type,value_type>,alloc>& vect
)
{
return impl::sparse_to_dense(vect, max_index_plus_one(vect));
}
// ----------------------------------------------------------------------------------------
template <typename T1, typename T2, typename T3, typename T4>
matrix<T2,0,1> sparse_to_dense (
const std::map<T1,T2,T3,T4>& vect,
unsigned long num_dimensions
)
{
return impl::sparse_to_dense(vect,num_dimensions);
}
// ----------------------------------------------------------------------------------------
template <typename T1, typename T2, typename T3, typename T4>
matrix<T2,0,1> sparse_to_dense (
const std::map<T1,T2,T3,T4>& vect
)
{
return impl::sparse_to_dense(vect, max_index_plus_one(vect));
}
// ----------------------------------------------------------------------------------------
template <typename T>
typename enable_if<is_matrix<T>,T&>::type sparse_to_dense(
T& item
) { return item; }
template <typename EXP>
matrix<typename EXP::type,0,1> sparse_to_dense(
const matrix_exp<EXP>& item,
unsigned long num
)
{
typedef typename EXP::type type;
if (item.size() == (long)num)
return item;
else if (item.size() < (long)num)
return join_cols(item, zeros_matrix<type>((long)num-item.size(),1));
else
return colm(item,0,(long)num);
}
// ----------------------------------------------------------------------------------------
template <typename sample_type, typename alloc>
std::vector<matrix<typename sample_type::value_type::second_type,0,1> > sparse_to_dense (
const std::vector<sample_type, alloc>& samples,
unsigned long num_dimensions
)
{
typedef typename sample_type::value_type pair_type;
typedef typename pair_type::second_type value_type;
std::vector< matrix<value_type,0,1> > result;
// now turn all the samples into dense samples
result.resize(samples.size());
for (unsigned long i = 0; i < samples.size(); ++i)
{
result[i] = sparse_to_dense(samples[i],num_dimensions);
}
return result;
}
// ----------------------------------------------------------------------------------------
template <typename sample_type, typename alloc>
std::vector<matrix<typename sample_type::value_type::second_type,0,1> > sparse_to_dense (
const std::vector<sample_type, alloc>& samples
)
{
return sparse_to_dense(samples, max_index_plus_one(samples));
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
T make_sparse_vector (
const T& v
)
{
// You must use unsigned integral key types in your sparse vectors
typedef typename T::value_type::first_type idx_type;
typedef typename T::value_type::second_type value_type;
COMPILE_TIME_ASSERT(is_unsigned_type<idx_type>::value);
std::map<idx_type,value_type> temp;
for (typename T::const_iterator i = v.begin(); i != v.end(); ++i)
{
temp[i->first] += i->second;
}
return T(temp.begin(), temp.end());
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
void make_sparse_vector_inplace(
T& vect
)
{
vect = make_sparse_vector(vect);
}
// ----------------------------------------------------------------------------------------
template <
typename T,
typename U,
typename alloc
>
void make_sparse_vector_inplace (
std::vector<std::pair<T,U>,alloc>& vect
)
{
if (vect.size() > 0)
{
std::sort(vect.begin(), vect.end());
// merge duplicates
for (unsigned long i = 1; i < vect.size(); ++i)
{
// if we found a duplicate
if (vect[i-1].first == vect[i].first)
{
// now start collapsing and merging the vector
unsigned long j = i-1;
for (unsigned long k = i; k < vect.size(); ++k)
{
if (vect[j].first == vect[k].first)
{
vect[j].second += vect[k].second;
}
else
{
++j;
vect[j] = vect[k];
}
}
// we removed elements when we merged so we need to adjust the size.
vect.resize(j+1);
return;
}
}
}
}
// ----------------------------------------------------------------------------------------
template <typename EXP, typename T, long NR, long NC, typename MM, typename L>
void sparse_matrix_vector_multiply (
const std::vector<sample_pair>& edges,
const matrix_exp<EXP>& v,
matrix<T,NR,NC,MM,L>& result
)
{
// make sure requires clause is not broken
DLIB_ASSERT(max_index_plus_one(edges) <= (unsigned long)v.size() &&
is_col_vector(v),
"\t void sparse_matrix_vector_multiply()"
<< "\n\t Invalid inputs were given to this function"
<< "\n\t max_index_plus_one(edges): " << max_index_plus_one(edges)
<< "\n\t v.size(): " << v.size()
<< "\n\t is_col_vector(v): " << is_col_vector(v)
);
result.set_size(v.nr(),v.nc());
result = 0;
for (unsigned long k = 0; k < edges.size(); ++k)
{
const long i = edges[k].index1();
const long j = edges[k].index2();
const double d = edges[k].distance();
result(i) += v(j)*d;
if (i != j)
result(j) += v(i)*d;
}
}
// ----------------------------------------------------------------------------------------
template <typename EXP>
matrix<typename EXP::type,0,1> sparse_matrix_vector_multiply (
const std::vector<sample_pair>& edges,
const matrix_exp<EXP>& v
)
{
matrix<typename EXP::type,0,1> result;
sparse_matrix_vector_multiply(edges,v,result);
return result;
}
// ----------------------------------------------------------------------------------------
template <typename EXP, typename T, long NR, long NC, typename MM, typename L>
void sparse_matrix_vector_multiply (
const std::vector<ordered_sample_pair>& edges,
const matrix_exp<EXP>& v,
matrix<T,NR,NC,MM,L>& result
)
{
// make sure requires clause is not broken
DLIB_ASSERT(max_index_plus_one(edges) <= (unsigned long)v.size() &&
is_col_vector(v),
"\t void sparse_matrix_vector_multiply()"
<< "\n\t Invalid inputs were given to this function"
<< "\n\t max_index_plus_one(edges): " << max_index_plus_one(edges)
<< "\n\t v.size(): " << v.size()
<< "\n\t is_col_vector(v): " << is_col_vector(v)
);
result.set_size(v.nr(),v.nc());
result = 0;
for (unsigned long k = 0; k < edges.size(); ++k)
{
const long i = edges[k].index1();
const long j = edges[k].index2();
const double d = edges[k].distance();
result(i) += v(j)*d;
}
}
// ----------------------------------------------------------------------------------------
template <typename EXP>
matrix<typename EXP::type,0,1> sparse_matrix_vector_multiply (
const std::vector<ordered_sample_pair>& edges,
const matrix_exp<EXP>& v
)
{
matrix<typename EXP::type,0,1> result;
sparse_matrix_vector_multiply(edges,v,result);
return result;
}
// ----------------------------------------------------------------------------------------
template <
typename EXP,
typename sparse_vector_type,
typename T,
long NR,
long NC,
typename MM,
typename L
>
void sparse_matrix_vector_multiply (
const matrix_exp<EXP>& m,
const sparse_vector_type& v,
matrix<T,NR,NC,MM,L>& result
)
{
// make sure requires clause is not broken
DLIB_ASSERT(max_index_plus_one(v) <= (unsigned long)m.nc(),
"\t void sparse_matrix_vector_multiply()"
<< "\n\t Invalid inputs were given to this function"
<< "\n\t max_index_plus_one(v): " << max_index_plus_one(v)
<< "\n\t m.size(): " << m.size()
);
result.set_size(m.nr(),1);
result = 0;
for (typename sparse_vector_type::const_iterator i = v.begin(); i != v.end(); ++i)
{
for (long r = 0; r < result.nr(); ++r)
{
result(r) += m(r, i->first)*i->second;
}
}
}
// ----------------------------------------------------------------------------------------
template <
typename EXP,
typename sparse_vector_type
>
matrix<typename EXP::type,0,1> sparse_matrix_vector_multiply (
const matrix_exp<EXP>& m,
const sparse_vector_type& v
)
{
matrix<typename EXP::type,0,1> result;
sparse_matrix_vector_multiply(m,v,result);
return result;
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_SVm_SPARSE_VECTOR