Commit aa085b33 authored by Philipp Arras's avatar Philipp Arras
Browse files

Add Uniform distribution operator

parent 9fb21e4b
Pipeline #47037 passed with stages
in 16 minutes and 36 seconds
......@@ -76,7 +76,8 @@ from .plot import Plot
from .library.smooth_linear_amplitude import (
SLAmplitude, LinearSLAmplitude, CepstrumOperator)
from .library.inverse_gamma_operator import InverseGammaOperator
from .library.probability_transform_operators import (InverseGammaOperator,
from .library.los_response import LOSResponse
from .library.dynamic_operator import (dynamic_operator,
......@@ -104,3 +104,45 @@ class InverseGammaOperator(Operator):
def q(self):
return self._q
class UniformOperator(Operator):
"""Transforms a Gaussian into a uniform distribution in the interval [0,1].
domain : Domain, tuple of Domain or DomainTuple
The domain on which the field shall be defined. This is at the same
time the domain and the target of the operator.
scale : float
Scales the output, default: 1.
offset : float
Shifts the output. The shift is applied after the scaling, default: 0.
def __init__(self, domain, scale=1, offset=0):
self._domain = self._target = DomainTuple.make(domain)
self._scale, self._offset = float(scale), float(offset)
if self._scale == 0.:
raise ValueError
def apply(self, x):
lin = isinstance(x, Linearization)
val = x.val.local_data if lin else x.local_data
res = norm.cdf(val)
if self._scale != 1.:
res *= self._scale
if self._offset != 0.:
res += self._offset
resfld = Field.from_local_data(self._domain, res)
if not lin:
return resfld
der = norm.pdf(val)
if self._scale != 1.:
der *= self._scale
jac = makeOp(Field.from_local_data(self._domain, der))
jac = jac(x.jac)
return, jac)
......@@ -130,6 +130,15 @@ def testPointModel(space, seed):
ift.extra.check_jacobian_consistency(model, pos, tol=1e-2, ntries=20)
@pmp('scale', [1, 2.2])
@pmp('offset', [0, 127.46])
def testUniformOperator(space, seed, scale, offset):
S = ift.ScalingOperator(1., space)
pos = S.draw_sample()
model = ift.UniformOperator(space, scale, offset)
ift.extra.check_jacobian_consistency(model, pos, ntries=20)
@pmp('target', [
ift.RGSpace(64, distances=.789, harmonic=True),
ift.RGSpace([32, 32], distances=.789, harmonic=True),
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