dpnp.random.Philox4x3210

class dpnp.random.Philox4x3210(seed=None, *, counter=None, key=None, device=None, sycl_queue=None)

A Philox4x32-10 counter-based bit generator on the device.

The generator of Salmon et al. (2011), with a 64-bit key and a 128-bit counter, as implemented by the oneMKL device RNG API. It is not the same as numpy.random.Philox, which is Philox4x64-10.

Parameters:

seed{None, int, array_like[ints], SeedSequence}, optional

The entropy the key is derived from, unless key is given. See dpnp.random.BitGenerator.

Default: None.

counter{None, int}, optional

The initial 128-bit counter.

Default: None, which starts from 0.

key{None, int}, optional

The 64-bit key. Mutually exclusive with seed.

Default: None, which derives the key from seed.

device{None, string, SyclDevice, SyclQueue, Device}, optional

See dpnp.random.BitGenerator.

Default: None.

sycl_queue{None, SyclQueue}, optional

See dpnp.random.BitGenerator.

Default: None.

Notes

Every call that produces n values takes ceil(n / 8) blocks of 2**64 counter values, one for each work-item of the kernel, and every work-item draws as many values as its rejection samplers need from its own block. Element i comes from the block i % ceil(n / 8), so the values depend on the output size: a draw is not a prefix of a larger one. For a given state, output size and data type, the raw bits and the uniform floats are the same on every device, while the samplers built on transcendental functions agree to a few ULP, or differ where a rejection sampler then takes another candidate.