test_model_gradients.py 4.1 KB
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# 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/>.
#
# Copyright(C) 2013-2019 Max-Planck-Society
#
# NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik.

import numpy as np
import pytest

import nifty5 as ift

from .common import list2fixture

pmp = pytest.mark.parametrize
space = list2fixture([
    ift.GLSpace(15),
    ift.RGSpace(64, distances=.789),
    ift.RGSpace([32, 32], distances=.789)
])
space1 = space
seed = list2fixture([4, 78, 23])


def _make_linearization(type, space, seed):
    np.random.seed(seed)
    S = ift.ScalingOperator(1., space)
    s = S.draw_sample()
    if type == "Constant":
        return ift.Linearization.make_const(s)
    elif type == "Variable":
        return ift.Linearization.make_var(s)
    raise ValueError('unknown type passed')


def testBasics(space, seed):
    var = _make_linearization("Variable", space, seed)
    model = ift.ScalingOperator(6., var.target)
    ift.extra.check_value_gradient_consistency(model, var.val)


@pmp('type1', ['Variable', 'Constant'])
@pmp('type2', ['Variable'])
def testBinary(type1, type2, space, seed):
    dom1 = ift.MultiDomain.make({'s1': space})
    # FIXME Remove?
    lin1 = _make_linearization(type1, dom1, seed)
    dom2 = ift.MultiDomain.make({'s2': space})
    # FIXME Remove?
    lin2 = _make_linearization(type2, dom2, seed)

    dom = ift.MultiDomain.union((dom1, dom2))
    select_s1 = ift.ducktape(None, dom, "s1")
    select_s2 = ift.ducktape(None, dom, "s2")
    model = select_s1*select_s2
    pos = ift.from_random("normal", dom)
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)
    model = select_s1 + select_s2
    pos = ift.from_random("normal", dom)
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)
    model = select_s1.scale(3.)
    pos = ift.from_random("normal", dom1)
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)
    model = ift.ScalingOperator(2.456, space)(select_s1*select_s2)
    pos = ift.from_random("normal", dom)
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)
    model = ift.positive_tanh(
        ift.ScalingOperator(2.456, space)(select_s1*select_s2))
    pos = ift.from_random("normal", dom)
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)
    pos = ift.from_random("normal", dom)
    model = ift.OuterProduct(pos['s1'], ift.makeDomain(space))
    ift.extra.check_value_gradient_consistency(model, pos['s2'], ntries=20)
    if isinstance(space, ift.RGSpace):
        model = ift.FFTOperator(space)(select_s1*select_s2)
        pos = ift.from_random("normal", dom)
        ift.extra.check_value_gradient_consistency(model, pos, ntries=20)


def testModelLibrary(space, seed):
    # Tests amplitude model and coorelated field model
    Npixdof, ceps_a, ceps_k, sm, sv, im, iv = 4, 0.5, 2., 3., 1.5, 1.75, 1.3
    np.random.seed(seed)
    model = ift.AmplitudeModel(space, Npixdof, ceps_a, ceps_k, sm, sv, im, iv)
    S = ift.ScalingOperator(1., model.domain)
    pos = S.draw_sample()
    ift.extra.check_value_gradient_consistency(model, pos, ntries=20)

    model2 = ift.CorrelatedField(space, model)
    S = ift.ScalingOperator(1., model2.domain)
    pos = S.draw_sample()
    ift.extra.check_value_gradient_consistency(model2, pos, ntries=20)


def testPointModel(space, seed):
    S = ift.ScalingOperator(1., space)
    pos = S.draw_sample()
    alpha = 1.5
    q = 0.73
    model = ift.InverseGammaModel(space, alpha, q)
    # FIXME All those cdfs and ppfs are not very accurate
    ift.extra.check_value_gradient_consistency(model, pos, tol=1e-2, ntries=20)