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ift
NIFTy
Commits
69fbbd07
Commit
69fbbd07
authored
Oct 24, 2019
by
Philipp Arras
Browse files
Amplitude model with integrated Wiener process
parent
eccb2cbf
Changes
1
Show whitespace changes
Inline
Side-by-side
nifty5/library/wiener_process_integrated_amplitude.py
0 → 100644
View file @
69fbbd07
import
nifty5
as
ift
import
numpy
as
np
class
WienerProcessIntegratedAmplitude
(
ift
.
LinearOperator
):
def
__init__
(
self
,
target
):
# target is PowerSpace
self
.
_target
=
ift
.
makeDomain
(
target
)
self
.
_domain
=
ift
.
makeDomain
(
ift
.
UnstructuredDomain
(
self
.
target
.
shape
[
0
]
-
2
))
self
.
_capability
=
self
.
TIMES
|
self
.
ADJOINT_TIMES
def
apply
(
self
,
x
,
mode
):
self
.
_check_input
(
x
,
mode
)
if
mode
==
self
.
TIMES
:
x
=
x
.
to_global_data
()
res
=
np
.
empty
(
self
.
_target
.
shape
)
res
[
0
]
=
0
res
[
1
]
=
0
res
[
2
:]
=
np
.
cumsum
(
x
)
res
[
1
:]
=
np
.
cumsum
(
res
[
1
:])
return
ift
.
from_global_data
(
self
.
_target
,
res
)
else
:
x
=
x
.
to_global_data
()
res
=
np
.
empty
(
self
.
_target
.
shape
)
res
[
1
:]
=
np
.
cumsum
(
x
[
1
:][::
-
1
])[::
-
1
]
res
[
2
:]
=
np
.
cumsum
(
res
[
2
:][::
-
1
])[::
-
1
]
return
ift
.
from_global_data
(
self
.
_domain
,
res
[
2
:])
if
__name__
==
'__main__'
:
np
.
random
.
seed
(
42
)
ndim
=
1
sspace
=
ift
.
RGSpace
(
np
.
linspace
(
16
,
20
,
num
=
ndim
).
astype
(
np
.
int
),
np
.
linspace
(
2.3
,
7.99
,
num
=
ndim
))
hspace
=
sspace
.
get_default_codomain
()
target
=
ift
.
PowerSpace
(
hspace
)
op
=
WienerProcessIntegratedAmplitude
(
target
)
ift
.
extra
.
consistency_check
(
op
)
fld
=
ift
.
from_random
(
'normal'
,
op
.
domain
)
ift
.
single_plot
(
op
(
fld
)
+
100
,
name
=
'debug.png'
)
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