test_power.py 2.96 KB
Newer Older
Philipp Arras's avatar
Philipp Arras committed
1
2
3
4
5
6
7
8
9
10
11
12
13
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
Martin Reinecke's avatar
Martin Reinecke committed
14
# Copyright(C) 2013-2018 Max-Planck-Society
Philipp Arras's avatar
Philipp Arras committed
15
16
17
18
19
20
21
22
23
24
25
26
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
# and financially supported by the Studienstiftung des deutschen Volkes.

import unittest
import nifty4 as ift
import numpy as np
from itertools import product
from test.common import expand
from numpy.testing import assert_allclose


Martin Reinecke's avatar
Martin Reinecke committed
27
28
29
30
def _flat_PS(k):
    return np.ones_like(k)


31
class Energy_Tests(unittest.TestCase):
Philipp Arras's avatar
Philipp Arras committed
32
33
    @expand(product([ift.RGSpace(64, distances=.789),
                     ift.RGSpace([32, 32], distances=.789)],
34
35
36
37
                    [ift.library.Exponential, ift.library.Linear],
                    [132, 42, 3]))
    def testNonlinearPower(self, space, nonlinearity, seed):
        np.random.seed(seed)
Philipp Arras's avatar
Philipp Arras committed
38
39
        f = nonlinearity()
        dim = len(space.shape)
40
41
        hspace = space.get_default_codomain()
        ht = ift.HarmonicTransformOperator(hspace, space)
Philipp Arras's avatar
Philipp Arras committed
42
43
        binbounds = ift.PowerSpace.useful_binbounds(hspace, logarithmic=True)
        pspace = ift.PowerSpace(hspace, binbounds=binbounds)
Martin Reinecke's avatar
Martin Reinecke committed
44
        Dist = ift.PowerDistributor(target=hspace, power_space=pspace)
Philipp Arras's avatar
Philipp Arras committed
45
46
47
48
        xi = ift.Field.from_random(domain=hspace, random_type='normal')

        def pspec(k): return 1 / (1 + k**2)**dim
        tau0 = ift.PS_field(pspace, pspec)
Martin Reinecke's avatar
Martin Reinecke committed
49
        A = Dist(ift.sqrt(tau0))
Philipp Arras's avatar
Philipp Arras committed
50
        n = ift.Field.from_random(domain=space, random_type='normal')
51
        s = ht(xi * A)
Martin Reinecke's avatar
Martin Reinecke committed
52
        R = ift.ScalingOperator(10., space)
Philipp Arras's avatar
Philipp Arras committed
53
54
55
56
57
58
59
60
61
        diag = ift.Field.ones(space)
        N = ift.DiagonalOperator(diag)
        d = R(f(s)) + n

        IC = ift.GradientNormController(
            iteration_limit=100,
            tol_abs_gradnorm=1e-5)
        inverter = ift.ConjugateGradient(IC)

Martin Reinecke's avatar
Martin Reinecke committed
62
        S = ift.create_power_operator(hspace, power_spectrum=_flat_PS)
Philipp Arras's avatar
Philipp Arras committed
63
64
65
66
67
68
69
70
        D = ift.library.NonlinearWienerFilterEnergy(
            position=xi,
            d=d,
            Instrument=R,
            nonlinearity=f,
            power=A,
            N=N,
            S=S,
71
            ht=ht,
Philipp Arras's avatar
Philipp Arras committed
72
73
            inverter=inverter).curvature

74
        energy = ift.library.NonlinearPowerEnergy(
Philipp Arras's avatar
Philipp Arras committed
75
76
            position=tau0,
            d=d,
Philipp Arras's avatar
Philipp Arras committed
77
            xi=xi,
Philipp Arras's avatar
Philipp Arras committed
78
79
            D=D,
            Instrument=R,
Martin Reinecke's avatar
Martin Reinecke committed
80
            Distributor=Dist,
Philipp Arras's avatar
Philipp Arras committed
81
            nonlinearity=f,
82
            ht=ht,
Philipp Arras's avatar
Philipp Arras committed
83
            N=N,
84
            samples=10)
Martin Reinecke's avatar
Martin Reinecke committed
85
        ift.extra.check_value_gradient_consistency(energy, tol=1e-5, ntries=10)