org.nd4j.linalg.api.rng

Interface Random

All Superinterfaces:

AutoCloseable

All Known Implementing Classes:

DefaultRandom

public interface Random
extends AutoCloseable

Random generation based on commons math. This is mean to be an independent.

Author:

Adam Gibson

Method Summary

Modifier and Type	Method and Description
long	getSeed() Gets the long seed of the underlying random number generator.
DataBuffer	getStateBuffer() This method returns pointer to RNG buffer
org.bytedeco.javacpp.Pointer	getStatePointer() This method returns pointer to RNG state structure.
boolean	nextBoolean() Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
void	nextBytes(byte[] bytes) Generates random bytes and places them into a user-supplied byte array.
double	nextDouble() Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
INDArray	nextDouble(char order, int[] shape) Generate a uniform number ndarray of the specified shape and order
INDArray	nextDouble(int[] shape) Generate a uniform number ndarray of the specified shape
float	nextFloat() Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
INDArray	nextFloat(char order, int[] shape) Generate a uniform number ndarray of the specified shape
INDArray	nextFloat(int[] shape) Generate a uniform number ndarray of the specified shape
double	nextGaussian() Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
INDArray	nextGaussian(char order, int[] shape) Generate a gaussian number ndarray of the specified shape and order
INDArray	nextGaussian(int[] shape) Generate a gaussian number ndarray of the specified shape
int	nextInt() Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
int	nextInt(int n) Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
INDArray	nextInt(int[] shape) Generate a random set of integers of the specified shape.
INDArray	nextInt(int n, int[] shape) Generate a random set of integers of the specified shape.
long	nextLong() Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.
void	reSeed() This method is similar to setSeed() but it doesn't really touches underlying buffer, if any.
void	reSeed(long seed) This method is similar to setSeed() but it doesn't really touches underlying buffer, if any.
void	setSeed(int seed) Sets the seed of the underlying random number generator using an int seed.
void	setSeed(int[] seed) Sets the seed of the underlying random number generator using an int seed.
void	setSeed(long seed) Sets the seed of the underlying random number generator using a long seed.

Methods inherited from interface java.lang.AutoCloseable

close

Method Detail

setSeed

void setSeed(int seed)

Sets the seed of the underlying random number generator using an int seed.

Sequences of values generated starting with the same seeds should be identical.

Parameters:

seed - the seed value

setSeed

void setSeed(int[] seed)

Sets the seed of the underlying random number generator using an int seed.

Sequences of values generated starting with the same seeds should be identical.

Parameters:

seed - the seed value

setSeed

void setSeed(long seed)

Sets the seed of the underlying random number generator using a long seed.

Sequences of values generated starting with the same seeds should be identical.

Parameters:

seed - the seed value

getSeed

long getSeed()

Gets the long seed of the underlying random number generator.

Returns:

the seed value

nextBytes

void nextBytes(byte[] bytes)

Generates random bytes and places them into a user-supplied byte array. The number of random bytes produced is equal to the length of the byte array.

Parameters:

bytes - the non-null byte array in which to put the random bytes

nextInt

int nextInt()

Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence. All 2³² possible int values should be produced with (approximately) equal probability.

Returns:

the next pseudorandom, uniformly distributed int value from this random number generator's sequence

nextInt

int nextInt(int n)

Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

Parameters:

n - the bound on the random number to be returned. Must be positive.

Returns:

a pseudorandom, uniformly distributed int value between 0 (inclusive) and n (exclusive).

Throws:

IllegalArgumentException - if n is not positive.

nextLong

long nextLong()

Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence. All 2⁶⁴ possible long values should be produced with (approximately) equal probability.

Returns:

the next pseudorandom, uniformly distributed long value from this random number generator's sequence

nextBoolean

boolean nextBoolean()

Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence

nextFloat

float nextFloat()

Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence

nextDouble

double nextDouble()

Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.

Returns:

the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence

nextGaussian

double nextGaussian()

Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.

Returns:

the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence

nextGaussian

INDArray nextGaussian(int[] shape)

Generate a gaussian number ndarray of the specified shape

Parameters:

shape - the shape to generate

Returns:

the generated gaussian numbers

nextGaussian

INDArray nextGaussian(char order,
                      int[] shape)

Generate a gaussian number ndarray of the specified shape and order

Parameters:

order - the order of the output array

shape - the shape to generate

Returns:

the generated gaussian numbers

nextDouble

INDArray nextDouble(int[] shape)

Generate a uniform number ndarray of the specified shape

Parameters:

shape - the shape to generate

Returns:

the generated gaussian numbers

nextDouble

INDArray nextDouble(char order,
                    int[] shape)

Generate a uniform number ndarray of the specified shape and order

Parameters:

order - order of the output array

shape - the shape to generate

Returns:

the generated gaussian numbers

nextFloat

INDArray nextFloat(int[] shape)

Generate a uniform number ndarray of the specified shape

Parameters:

shape - the shape to generate

Returns:

the generated uniform numbers

nextFloat

INDArray nextFloat(char order,
                   int[] shape)

Generate a uniform number ndarray of the specified shape

Parameters:

shape - the shape to generate

Returns:

the generated uniform numbers

nextInt

INDArray nextInt(int[] shape)

Generate a random set of integers of the specified shape. Note that these integers will not actually be integers but floats that happen to be whole numbers. The reason for this is due to ints having the same space usage as floats. This also plays nice with blas.

If the data type is set to double, then these will be whole doubles.

Parameters:

shape - the shape to generate

Returns:

the ndarray with the shape of only integers.

nextInt

INDArray nextInt(int n,
                 int[] shape)

Generate a random set of integers of the specified shape. Note that these integers will not actually be integers but floats that happen to be whole numbers. The reason for this is due to ints having the same space usage as floats. This also plays nice with blas.

If the data type is set to double, then these will be whole doubles.

Parameters:

shape - the shape to generate

n - the max number to generate trod a

Returns:

the ndarray with the shape of only integers.

getStatePointer

org.bytedeco.javacpp.Pointer getStatePointer()

This method returns pointer to RNG state structure. Please note: DefaultRandom implementation returns NULL here, making it impossible to use with RandomOps

Returns:

getStateBuffer

DataBuffer getStateBuffer()

This method returns pointer to RNG buffer

Returns:

reSeed

void reSeed()

This method is similar to setSeed() but it doesn't really touches underlying buffer, if any. So it acts as additional modifier to current RNG state. System.currentTimeMillis() will be used as modifier. PLEASE NOTE: Never use this method unless you're 100% sure what it does and why you would need it.

reSeed

void reSeed(long seed)

This method is similar to setSeed() but it doesn't really touches underlying buffer, if any. So it acts as additional modifier to current RNG state. PLEASE NOTE: Never use this method unless you're 100% sure what it does and why you would need it.

Parameters:

seed -