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#######################################################
# Copyright (c) 2015, ArrayFire
# All rights reserved.
#
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# http://arrayfire.com/licenses/BSD-3-Clause
########################################################
"""
Random engine class and functions to generate random numbers.
"""
from
.
library
import
*
from
.
array
import
*
import
numbers
class
Random_Engine
(
object
):
"""
Class to handle random number generator engines.
Parameters
----------
engine_type : optional: RANDOME_ENGINE. default: RANDOM_ENGINE.PHILOX
- Specifies the type of random engine to be created. Can be one of:
- RANDOM_ENGINE.PHILOX_4X32_10
- RANDOM_ENGINE.THREEFRY_2X32_16
- RANDOM_ENGINE.MERSENNE_GP11213
- RANDOM_ENGINE.PHILOX (same as RANDOM_ENGINE.PHILOX_4X32_10)
- RANDOM_ENGINE.THREEFRY (same as RANDOM_ENGINE.THREEFRY_2X32_16)
- RANDOM_ENGINE.DEFAULT
- Not used if engine is not None
seed : optional int. default: 0
- Specifies the seed for the random engine
- Not used if engine is not None
engine : optional ctypes.c_void_p. default: None.
- Used a handle created by the C api to create the Random_Engine.
"""
def
__init__
(
self
,
engine_type
=
RANDOM_ENGINE
.
PHILOX
,
seed
=
0
,
engine
=
None
):
if
(
engine
is
None
):
self
.
engine
=
c_void_ptr_t
(
0
)
safe_call
(
backend
.
get
().
af_create_random_engine
(
c_pointer
(
self
.
engine
),
engine_type
.
value
,
c_longlong_t
(
seed
)))
else
:
self
.
engine
=
engine
def
__del__
(
self
):
safe_call
(
backend
.
get
().
af_release_random_engine
(
self
.
engine
))
def
set_type
(
self
,
engine_type
):
"""
Set the type of the random engine.
"""
safe_call
(
backend
.
get
().
af_random_engine_set_type
(
c_pointer
(
self
.
engine
),
engine_type
.
value
))
def
get_type
(
self
):
"""
Get the type of the random engine.
"""
__to_random_engine_type
=
[
RANDOM_ENGINE
.
PHILOX_4X32_10
,
RANDOM_ENGINE
.
THREEFRY_2X32_16
,
RANDOM_ENGINE
.
MERSENNE_GP11213
]
rty
=
c_int_t
(
RANDOM_ENGINE
.
PHILOX
.
value
)
safe_call
(
backend
.
get
().
af_random_engine_get_type
(
c_pointer
(
rty
),
self
.
engine
))
return
__to_random_engine_type
[
rty
]
def
set_seed
(
self
,
seed
):
"""
Set the seed for the random engine.
"""
safe_call
(
backend
.
get
().
af_random_engine_set_seed
(
c_pointer
(
self
.
engine
),
c_longlong_t
(
seed
)))
def
get_seed
(
self
):
"""
Get the seed for the random engine.
"""
seed
=
c_longlong_t
(
0
)
safe_call
(
backend
.
get
().
af_random_engine_get_seed
(
c_pointer
(
seed
),
self
.
engine
))
return
seed
.
value
def
randu
(
d0
,
d1
=
None
,
d2
=
None
,
d3
=
None
,
dtype
=
Dtype
.
f32
,
engine
=
None
):
"""
Create a multi dimensional array containing values from a uniform distribution.
Parameters
----------
d0 : int.
Length of first dimension.
d1 : optional: int. default: None.
Length of second dimension.
d2 : optional: int. default: None.
Length of third dimension.
d3 : optional: int. default: None.
Length of fourth dimension.
dtype : optional: af.Dtype. default: af.Dtype.f32.
Data type of the array.
engine : optional: Random_Engine. default: None.
If engine is None, uses a default engine created by arrayfire.
Returns
-------
out : af.Array
Multi dimensional array whose elements are sampled uniformly between [0, 1].
- If d1 is None, `out` is 1D of size (d0,).
- If d1 is not None and d2 is None, `out` is 2D of size (d0, d1).
- If d1 and d2 are not None and d3 is None, `out` is 3D of size (d0, d1, d2).
- If d1, d2, d3 are all not None, `out` is 4D of size (d0, d1, d2, d3).
"""
out
=
Array
()
dims
=
dim4
(
d0
,
d1
,
d2
,
d3
)
if
engine
is
None
:
safe_call
(
backend
.
get
().
af_randu
(
c_pointer
(
out
.
arr
),
4
,
c_pointer
(
dims
),
dtype
.
value
))
else
:
safe_call
(
backend
.
get
().
af_random_uniform
(
c_pointer
(
out
.
arr
),
4
,
c_pointer
(
dims
),
dtype
.
value
,
engine
.
engine
))
return
out
def
randn
(
d0
,
d1
=
None
,
d2
=
None
,
d3
=
None
,
dtype
=
Dtype
.
f32
,
engine
=
None
):
"""
Create a multi dimensional array containing values from a normal distribution.
Parameters
----------
d0 : int.
Length of first dimension.
d1 : optional: int. default: None.
Length of second dimension.
d2 : optional: int. default: None.
Length of third dimension.
d3 : optional: int. default: None.
Length of fourth dimension.
dtype : optional: af.Dtype. default: af.Dtype.f32.
Data type of the array.
engine : optional: Random_Engine. default: None.
If engine is None, uses a default engine created by arrayfire.
Returns
-------
out : af.Array
Multi dimensional array whose elements are sampled from a normal distribution with mean 0 and sigma of 1.
- If d1 is None, `out` is 1D of size (d0,).
- If d1 is not None and d2 is None, `out` is 2D of size (d0, d1).
- If d1 and d2 are not None and d3 is None, `out` is 3D of size (d0, d1, d2).
- If d1, d2, d3 are all not None, `out` is 4D of size (d0, d1, d2, d3).
"""
out
=
Array
()
dims
=
dim4
(
d0
,
d1
,
d2
,
d3
)
if
engine
is
None
:
safe_call
(
backend
.
get
().
af_randn
(
c_pointer
(
out
.
arr
),
4
,
c_pointer
(
dims
),
dtype
.
value
))
else
:
safe_call
(
backend
.
get
().
af_random_normal
(
c_pointer
(
out
.
arr
),
4
,
c_pointer
(
dims
),
dtype
.
value
,
engine
.
engine
))
return
out
def
set_seed
(
seed
=
0
):
"""
Set the seed for the random number generator.
Parameters
----------
seed: int.
Seed for the random number generator
"""
safe_call
(
backend
.
get
().
af_set_seed
(
c_ulonglong_t
(
seed
)))
def
get_seed
():
"""
Get the seed for the random number generator.
Returns
-------
seed: int.
Seed for the random number generator
"""
seed
=
c_ulonglong_t
(
0
)
safe_call
(
backend
.
get
().
af_get_seed
(
c_pointer
(
seed
)))
return
seed
.
value
def
set_default_random_engine_type
(
engine_type
):
"""
Set random engine type for default random engine.
Parameters
----------
engine_type : RANDOME_ENGINE.
- Specifies the type of random engine to be created. Can be one of:
- RANDOM_ENGINE.PHILOX_4X32_10
- RANDOM_ENGINE.THREEFRY_2X32_16
- RANDOM_ENGINE.MERSENNE_GP11213
- RANDOM_ENGINE.PHILOX (same as RANDOM_ENGINE.PHILOX_4X32_10)
- RANDOM_ENGINE.THREEFRY (same as RANDOM_ENGINE.THREEFRY_2X32_16)
- RANDOM_ENGINE.DEFAULT
Note
----
This only affects randu and randn when a random engine is not specified.
"""
safe_call
(
backend
.
get
().
af_set_default_random_engine_type
(
c_pointer
(
self
.
engine
),
engine_type
.
value
))
def
get_default_random_engine
():
"""
Get the default random engine
Returns
-------
The default random engine used by randu and randn
"""
engine
=
c_void_ptr_t
(
0
)
default_engine
=
c_void_ptr_t
(
0
)
safe_call
(
backend
.
get
().
af_get_default_random_engine
(
c_pointer
(
default_engine
)))
safe_call
(
backend
.
get
().
af_retain_random_engine
(
c_pointer
(
engine
),
default_engine
))
return
Random_Engine
(
engine
=
engine
)
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