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Added some overloads of the randomize_samples() functions to take

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std vector objects and to take just one vector of things without
labels as well.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%402368
This commit is contained in:
Davis King 2008-07-04 16:44:37 +00:00
parent 828f7bbb87
commit f870b052d7
2 changed files with 140 additions and 1 deletions
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87
dlib/svm/svm.h
View File

@ -14,6 +14,7 @@
#include "../std_allocator.h"
#include "function.h"
#include "kernel.h"
#include "../enable_if.h"
namespace dlib
{
@ -1123,7 +1124,7 @@ namespace dlib
typename T,
typename U
>
void randomize_samples (
typename enable_if<is_matrix<T>,void>::type randomize_samples (
T& t,
U& u
)
@ -1147,6 +1148,90 @@ namespace dlib
}
}
// ----------------------------------------------------------------------------------------
template <
typename T,
typename U
>
typename disable_if<is_matrix<T>,void>::type randomize_samples (
T& t,
U& u
)
{
rand::kernel_1a r;
long n = t.size()-1;
while (n > 0)
{
// put a random integer into idx
unsigned long idx = r.get_random_32bit_number();
// make idx be less than n
idx %= n;
// swap our randomly selected index into the n position
exchange(t[idx], t[n]);
exchange(u[idx], u[n]);
--n;
}
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
typename enable_if<is_matrix<T>,void>::type randomize_samples (
T& t
)
{
rand::kernel_1a r;
long n = t.nr()-1;
while (n > 0)
{
// put a random integer into idx
unsigned long idx = r.get_random_32bit_number();
// make idx be less than n
idx %= n;
// swap our randomly selected index into the n position
exchange(t(idx), t(n));
--n;
}
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
typename disable_if<is_matrix<T>,void>::type randomize_samples (
T& t
)
{
rand::kernel_1a r;
long n = t.size()-1;
while (n > 0)
{
// put a random integer into idx
unsigned long idx = r.get_random_32bit_number();
// make idx be less than n
idx %= n;
// swap our randomly selected index into the n position
exchange(t[idx], t[n]);
--n;
}
}
// ----------------------------------------------------------------------------------------
}

54
dlib/svm/svm_abstract.h
View File

@ -201,6 +201,60 @@ namespace dlib
- #labels(r) == labels(i)
!*/
// ----------------------------------------------------------------------------------------
template <
typename T
>
void randomize_samples (
T& samples
);
/*!
requires
- T == a matrix object that contains a swappable type
- samples.nc() == 1
ensures
- randomizes the order of the elements inside samples
!*/
// ----------------------------------------------------------------------------------------
template <
typename T,
typename U
>
void randomize_samples (
T& samples,
U& labels
);
/*!
requires
- T == an object compatible with std::vector that contains a swappable type
- U == an object compatible with std::vector that contains a swappable type
- samples.size() == labels.size()
ensures
- randomizes the order of the samples and labels but preserves
the pairing between each sample and its label
- for all valid i:
- let r == the random index samples[i] was moved to. then:
- #labels[r] == labels[i]
!*/
// ----------------------------------------------------------------------------------------
template <
typename T
>
void randomize_samples (
T& samples
);
/*!
requires
- T == an object compatible with std::vector that contains a swappable type
ensures
- randomizes the order of the elements inside samples
!*/
// ----------------------------------------------------------------------------------------
}