rocRAND data type support

rocRAND data type support#

Host API#

Generator types#

Table 11 Supported generators on the host#

Generator

rocRAND support

cuRAND support

XORWOW

✅

✅

MRG32K3A

✅

✅

MTGP32

✅

✅

Philox 4x32-10

✅

✅

MT19937

✅

✅

MRG31K3P

✅

❌

LFSR113

✅

❌

ThreeFry 2x32-20

✅

❌

ThreeFry 4x32-20

✅

❌

ThreeFry 2x64-20

✅

❌

ThreeFry 4x64-20

✅

❌

Sobol32

✅

✅

Scrambled Sobol32

✅

✅

Sobol64

✅

✅

Scrambled Sobol64

✅

✅

Only Sobol64, Scrambled Sobol64, ThreeFry 2x64-20 and ThreeFry 4x64-20 support generation of 64 bit unsigned long long int integers, the other generators generate 32 bit unsigned int integers.

Seed types#

All generators can be seeded with unsigned long long, however LFSR113 can additionally be seeded using an uint4.

Output types#

The generators produce pseudo-random numbers chosen from a given distribution. The following distributions and corresponding output types are supported for the host API:

Uniform distribution#

Table 12 Supported types for uniform distributions on the host#

Type

Size of type

rocRAND support

cuRAND support

unsigned char

8 bit

✅

❌

unsigned short

16 bit

✅

❌

unsigned int

32 bit

✅

✅

unsigned long long

64 bit [1]

✅

✅

half

16 bit

✅

❌

float

32 bit

✅

✅

double

64 bit

✅

✅

Uniform distributions of integral types return a number between 0 and 2^(size in bits) - 1, whereas floating-point types return a number between 0.0 and 1.0, excluding 1.0.

Poisson distribution#

Table 13 Supported types for the poisson distribution on the host#

Type

Size of type

rocRAND support

cuRAND support

unsigned int

32 bit

✅

✅

Normal distribution#

Table 14 Supported types for normal distributions on the host#

Type

Size of type

rocRAND support

cuRAND support

half

16 bit

✅

❌

float

32 bit

✅

✅

double

64 bit

✅

✅

Log-normal distributions#

Table 15 Supported types for log-normal distributions on the host#

Type

Size of type

rocRAND support

cuRAND support

half

16 bit

✅

❌

float

32 bit

✅

✅

double

64 bit

✅

✅

Device API#

Generator types#

Table 16 Supported generators on the device#

Generator

rocRAND support

cuRAND support

XORWOW

✅

✅

MRG32K3A

✅

✅

MTGP32

✅

✅

Philox 4x32-10

✅

✅

MT19937

❌

❌

MRG31K3P

✅

❌

LFSR113

✅

❌

ThreeFry 2x32-20

✅

❌

ThreeFry 4x32-20

✅

❌

ThreeFry 2x64-20

✅

❌

ThreeFry 4x64-20

✅

❌

Sobol32

✅

✅

Scrambled Sobol32

✅

✅

Sobol64

✅

✅

Scrambled Sobol64

✅

✅

Seed types#

All generators can be seeded with unsigned long long, however LFSR113 can additionally be seeded using an uint4.

Output types#

The generators produce pseudo-random numbers chosen from a given distribution. The following distributions and corresponding output types are supported for the device API, however not all generators support all types:

Uniform distribution#

Table 17 Supported types for uniform distributions on the device#

Type

rocRAND support

supported rocRAND generators

cuRAND support

unsigned int

✅

all native 32-bit generators

✅

unsigned long long int

✅

all native 64-bit generators

✅

float

✅

all generators

✅

float2

✅

Philox 4x32-10

❌

float4

✅

Philox 4x32-10

✅

double

✅

all generators

✅

double2

✅

Philox 4x32-10

✅

double4

✅

Philox 4x32-10

❌

Normal distribution#

Table 18 Supported types for normal distributions on the device#

Type

rocRAND support

supported rocRAND generators

cuRAND support

float

✅

all generators

✅

float2

✅

Philox 4x32-10, MRG31K3P, MRG32K3A, XORWOW, LFSR113, all ThreeFry generators

✅

float4

✅

Philox 4x32-10

✅

double

✅

all generators

✅

double2

✅

Philox 4x32-10, MRG31K3P, MRG32K3A, XORWOW, LFSR113, all ThreeFry generators

✅

double4

✅

Philox 4x32-10

❌

Log-normal distributions#

Table 19 Supported types for log-normal distributions on the device#

Type

rocRAND support

supported rocRAND generators

cuRAND support

float

✅

all generators

✅

float2

✅

Philox 4x32-10, MRG31K3P, MRG32K3A, XORWOW, LFSR113, all ThreeFry generators

✅

float4

✅

Philox 4x32-10

✅

double

✅

all generators

✅

double2

✅

Philox 4x32-10, MRG31K3P, MRG32K3A, XORWOW, LFSR113, all ThreeFry generators

✅

double4

✅

Philox 4x32-10

❌

Poisson distributions#

Table 20 Supported types for poisson distributions on the device#

Type

rocRAND support

supported rocRAND generators

cuRAND support

unsigned int

✅

Philox 4x32-10, MRG31k3p, MRG32K3A, XORWOW, MTGP32, Sobol32, Scrambled Sobol32, LFSR113, all ThreeFry generators

✅

unsigned long long int

✅

Sobol64, Scrambled sobol64

❌

uint4

✅

Philox 4x32-10

✅

Discrete distributions#

Table 21 Supported types for discrete distributions on the device#

Type

rocRAND support

supported rocRAND generators

cuRAND support

unsigned int

✅

all generators

✅

uint4

✅

Philox 4x32-10

✅ - only Philox - 4x32-10

Footnotes

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