Brush C++ API
A flexible interpretable machine learning framework
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Public Member Functions | Static Public Member Functions | Private Member Functions | Private Attributes | Static Private Attributes | List of all members
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_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
 

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 128 of file rnd.cpp.

Member Function Documentation

◆ destroy()

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

Definition at line 38 of file rnd.cpp.

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◆ gasdev()

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

Definition at line 93 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 91 of file rnd.cpp.

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◆ operator()() [2/2]

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

Definition at line 86 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 128 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 96 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 117 of file rnd.h.

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◆ rnd_dbl()

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

Definition at line 80 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 74 of file rnd.cpp.

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◆ rnd_int()

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

Definition at line 68 of file rnd.cpp.

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◆ select_randomly() [1/2]

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

Definition at line 61 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 73 of file rnd.h.

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◆ 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 49 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 121 of file rnd.cpp.

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Member Data Documentation

◆ instance

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

Definition at line 167 of file rnd.h.

◆ rg

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

Definition at line 163 of file rnd.h.

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