Brush C++ API
A flexible interpretable machine learning framework
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Brush::Util::Rnd Class Reference

Defines a multi-core random number generator and its operators. More...

#include <rnd.h>

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Public Member Functions

void set_seed (unsigned int seed)
int rnd_int (int lowerLimit, int upperLimit)
float rnd_flt (float min=0.0, float max=1.0)
float rnd_alpha_beta (float alpha, float beta)
float rnd_dbl (float min=0.0, float max=1.0)
float operator() (unsigned i)
float operator() ()
template<class RandomAccessIterator>
void shuffle (RandomAccessIterator first, RandomAccessIterator last)
vector< size_t > shuffled_index (size_t n)
 returns a shuffled index vector of length n
template<typename Iter>
Iter select_randomly (Iter start, Iter end)
template<typename Iter, typename Iter2>
Iter select_randomly (Iter start, Iter end, Iter2 wstart, Iter2 wend)
 select randomly with weighted distribution.
template<typename T>
T random_choice (const map< T, float > &m)
template<class V, class T>
T random_choice (const V &v)
template<template< class, class > class C, class T>
T random_choice (const C< T, std::allocator< T > > &v, const vector< float > &w)
float gasdev ()

Static Public Member Functions

static Rnd * initRand ()
static void destroy ()

Private Member Functions

 Rnd ()
 ~Rnd ()

Private Attributes

vector< std::mt19937 > rg
bool has_spare_normal = false
float spare_normal = 0.0f

Static Private Attributes

static Rnd * instance = NULL

Detailed Description

Defines a multi-core random number generator and its operators.

Definition at line 28 of file rnd.h.

Constructor & Destructor Documentation

◆ Rnd()

Brush::Util::Rnd::Rnd ( )
private

need a random generator for each core to do multiprocessing. The constructor will resize the random generators based on the number of available cores.

Definition at line 12 of file rnd.cpp.

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◆ ~Rnd()

Brush::Util::Rnd::~Rnd ( )
private

Definition at line 162 of file rnd.cpp.

Member Function Documentation

◆ destroy()

void Brush::Util::Rnd::destroy ( )
static

Definition at line 38 of file rnd.cpp.

◆ gasdev()

float Brush::Util::Rnd::gasdev ( )

Definition at line 122 of file rnd.cpp.

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◆ initRand()

Rnd * Brush::Util::Rnd::initRand ( )
static

Definition at line 26 of file rnd.cpp.

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◆ operator()() [1/2]

float Brush::Util::Rnd::operator() ( )

Definition at line 120 of file rnd.cpp.

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◆ operator()() [2/2]

float Brush::Util::Rnd::operator() ( unsigned i)

Definition at line 115 of file rnd.cpp.

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◆ random_choice() [1/3]

template<template< class, class > class C, class T>
T Brush::Util::Rnd::random_choice ( const C< T, std::allocator< T > > & v,
const vector< float > & w )
inline

return a weighted random element of an STL container

Definition at line 130 of file rnd.h.

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◆ random_choice() [2/3]

template<typename T>
T Brush::Util::Rnd::random_choice ( const map< T, float > & m)
inline

return a weighted random key of a map, where the values are weights.

Definition at line 98 of file rnd.h.

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◆ random_choice() [3/3]

template<class V, class T>
T Brush::Util::Rnd::random_choice ( const V & v)
inline

return a random element of a vector.

Definition at line 119 of file rnd.h.

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◆ rnd_alpha_beta()

float Brush::Util::Rnd::rnd_alpha_beta ( float alpha,
float beta )

Definition at line 83 of file rnd.cpp.

◆ rnd_dbl()

float Brush::Util::Rnd::rnd_dbl ( float min = 0.0,
float max = 1.0 )

Definition at line 109 of file rnd.cpp.

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◆ rnd_flt()

float Brush::Util::Rnd::rnd_flt ( float min = 0.0,
float max = 1.0 )

Definition at line 77 of file rnd.cpp.

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◆ rnd_int()

int Brush::Util::Rnd::rnd_int ( int lowerLimit,
int upperLimit )

Definition at line 71 of file rnd.cpp.

◆ select_randomly() [1/2]

template<typename Iter>
Iter Brush::Util::Rnd::select_randomly ( Iter start,
Iter end )
inline

Definition at line 63 of file rnd.h.

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◆ select_randomly() [2/2]

template<typename Iter, typename Iter2>
Iter Brush::Util::Rnd::select_randomly ( Iter start,
Iter end,
Iter2 wstart,
Iter2 wend )
inline

select randomly with weighted distribution.

Definition at line 75 of file rnd.h.

◆ set_seed()

void Brush::Util::Rnd::set_seed ( unsigned int seed)

set seeds for each core's random number generator.

Definition at line 46 of file rnd.cpp.

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◆ shuffle()

template<class RandomAccessIterator>
void Brush::Util::Rnd::shuffle ( RandomAccessIterator first,
RandomAccessIterator last )
inline

Definition at line 51 of file rnd.h.

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◆ shuffled_index()

vector< size_t > Brush::Util::Rnd::shuffled_index ( size_t n)

returns a shuffled index vector of length n

Definition at line 155 of file rnd.cpp.

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Member Data Documentation

◆ has_spare_normal

bool Brush::Util::Rnd::has_spare_normal = false
private

Definition at line 173 of file rnd.h.

◆ instance

Rnd * Brush::Util::Rnd::instance = NULL
staticprivate

Definition at line 178 of file rnd.h.

◆ rg

vector<std::mt19937> Brush::Util::Rnd::rg
private

Definition at line 165 of file rnd.h.

◆ spare_normal

float Brush::Util::Rnd::spare_normal = 0.0f
private

Definition at line 174 of file rnd.h.

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