Move stuff from global newton to nifty

nifty5/domains/__init__.py

@@ -7,6 +7,8 @@ from .hp_space import HPSpace
 from .gl_space import GLSpace
 from .dof_space import DOFSpace
 from .power_space import PowerSpace
+from .log_rg_space import LogRGSpace
 
 __all__ = ["Domain", "UnstructuredDomain", "StructuredDomain", "RGSpace",
-           "LMSpace", "HPSpace", "GLSpace", "DOFSpace", "PowerSpace"]
+           "LMSpace", "HPSpace", "GLSpace", "DOFSpace", "PowerSpace",
+           "LogRGSpace"]

nifty5/domains/log_rg_space.py

+from functools import reduce
+from ..sugar import exp
+
+import numpy as np
+
+from ..dobj import ibegin
+from ..field import Field
+from .structured_domain import StructuredDomain
+
+
+class LogRGSpace(StructuredDomain):
+
+    _needed_for_hash = ['_shape', '_bindistances', '_t_0', '_harmonic']
+
+    def __init__(self, shape, bindistances, t_0, harmonic=False):
+        super(LogRGSpace, self).__init__()
+
+        self._harmonic = bool(harmonic)
+
+        if np.isscalar(shape):
+            shape = (shape,)
+        self._shape = tuple(int(i) for i in shape)
+
+        self._bindistances = tuple(bindistances)
+        self._t_0 = tuple(t_0)
+
+        self._dim = int(reduce(lambda x, y: x * y, self._shape))
+        self._dvol = float(reduce(lambda x, y: x * y, self._bindistances))
+
+    @property
+    def harmonic(self):
+        return self._harmonic
+
+    @property
+    def shape(self):
+        return self._shape
+
+    def scalar_dvol(self):
+        return self._dvol
+
+    @property
+    def bindistances(self):
+        return np.array(self._bindistances)
+
+    @property
+    def size(self):
+        return np.prod(self._shape)
+
+    @property
+    def t_0(self):
+        return np.array(self._t_0)
+
+    def __repr__(self):
+        return ("LogRGSpace(shape=%r, harmonic=%r)"
+                % (self.shape, self.harmonic))
+
+    def get_default_codomain(self):
+        if self._harmonic:
+            raise ValueError("only supported for nonharmonic space")
+        codomain_bindistances = 1. / (self.bindistances * self.shape)
+        return LogRGSpace(self.shape, codomain_bindistances,
+                          np.zeros(len(self.shape)), True)
+
+    def get_k_length_array(self):
+        out = Field(self, dtype=np.float64)
+        oloc = out.local_data
+        ib = ibegin(out.val)
+        res = np.arange(oloc.shape[0], dtype=np.float64) + ib[0]
+        res = np.minimum(res, self.shape[0]-res)*self.bindistances[0]
+        if len(self.shape) == 1:
+            oloc[()] = res
+            return out
+        res *= res
+        for i in range(1, len(self.shape)):
+            tmp = np.arange(oloc.shape[i], dtype=np.float64) + ib[i]
+            tmp = np.minimum(tmp, self.shape[i]-tmp)*self.bindistances[i]
+            tmp *= tmp
+            res = np.add.outer(res, tmp)
+        oloc[()] = np.sqrt(res)
+        return out
+
+    def get_expk_length_array(self):
+        # FIXME This is a hack! Only for plotting. Seems not to be the final version.
+        out = exp(self.get_k_length_array())
+        out.val[1:] = out.val[:-1]
+        out.val[0] = 0
+        return out

nifty5/library/__init__.py

+from .amplitude_model import make_amplitude_model
+from .apply_data import ApplyData
 from .los_response import LOSResponse
 from .noise_energy import NoiseEnergy
 from .nonlinear_power_energy import NonlinearPowerEnergy
 from .nonlinear_wiener_filter_energy import NonlinearWienerFilterEnergy
 from .nonlinearities import Exponential, Linear, PositiveTanh, Tanh
 from .poisson_energy import PoissonEnergy
-from .unit_log_gauss import UnitLogGauss
 from .poisson_log_likelihood import PoissonLogLikelihood
+from .smooth_sky import make_smooth_mf_sky_model, make_smooth_sky_model
+from .unit_log_gauss import UnitLogGauss
 from .wiener_filter_curvature import WienerFilterCurvature
 from .wiener_filter_energy import WienerFilterEnergy

nifty5/library/amplitude_model.py

+import numpy as np
+
+from ..domains import PowerSpace, UnstructuredDomain
+from ..field import Field
+from ..multi import MultiField
+from ..sugar import makeOp, sqrt
+
+
+def _ceps_kernel(dof_space, k, a, k0):
+    return a**2/(1+(k/(k0*dof_space.bindistances[0]))**2)**2
+
+
+def make_amplitude_model(s_space, Npixdof, ceps_a, ceps_k, sm, sv, im, iv,
+                         keys=['tau', 'phi']):
+    '''
+    Method for construction of amplitude model
+    Computes a smooth power spectrum.
+    Output lives in PowerSpace.
+
+    Parameters
+    ----------
+
+    Npixdof : #pix in dof_space
+
+    ceps_a, ceps_k0 : Smoothnessparameters in ceps_kernel
+                        eg. ceps_kernel(k) = (a/(1+(k/k0)**2))**2
+                        a = ceps_a,  k0 = ceps_k0
+
+    sm, sv : slope_mean = expected exponent of powerlaw (e.g. -4),
+                slope_variance (default=1)
+
+    im, iv : y-intercept_mean, y-intercept_variance  of power_slope
+    '''
+    from ..operators import (ExpTransform, QHTOperator, SlopeOperator,
+                             SymmetrizingOperator)
+    h_space = s_space.get_default_codomain()
+    p_space = PowerSpace(h_space)
+    exp_transform = ExpTransform(p_space, Npixdof)
+    logk_space = exp_transform.domain[0]
+    dof_space = logk_space.get_default_codomain()
+    param_space = UnstructuredDomain(2)
+    qht = QHTOperator(dof_space, logk_space)
+    sym = SymmetrizingOperator(logk_space)
+
+    phi_mean = np.array([sm, im])
+    phi_sig = np.array([sv, iv])
+
+    slope = SlopeOperator(param_space, logk_space, phi_sig)
+    norm_phi_mean = Field(param_space, val=phi_mean/phi_sig)
+
+    fields = {keys[0]: Field.from_random('normal', dof_space),
+              keys[1]: Field.from_random('normal', param_space)}
+
+    position = MultiField(fields)
+
+    dof_space = position[keys[0]].domain[0]
+    kern = lambda k: _ceps_kernel(dof_space, k, ceps_a, ceps_k)
+    cepstrum = create_cepstrum_amplitude_field(dof_space, kern)
+
+    ceps = makeOp(sqrt(cepstrum))
+    smooth_op = sym * qht * ceps
+    from ..models import Variable
+    smooth_spec = smooth_op(Variable(position)[keys[0]])
+    phi = Variable(position)[keys[1]] + norm_phi_mean
+    linear_spec = slope(phi)
+    loglog_spec = smooth_spec + linear_spec
+    from ..models import PointwiseExponential
+    xlog_ampl = PointwiseExponential(0.5*loglog_spec)
+
+    internals = {'loglog_spec': loglog_spec,
+                 'qht': qht,
+                 'ceps': ceps,
+                 'norm_phi_mean': norm_phi_mean}
+    return exp_transform(xlog_ampl), internals
+
+
+def create_cepstrum_amplitude_field(domain, cepstrum):
+    """Creates a ...
+    Writes the sum of all modes into the zero-mode.
+
+    Parameters
+    ----------
+    domain: ???
+        ???
+    cepstrum: Callable
+        ???
+    """
+
+    dim = len(domain.shape)
+    dist = domain.bindistances
+    shape = domain.shape
+
+    # Prepare q_array
+    q_array = np.zeros((dim,) + shape)
+    if dim == 1:
+        ks = domain.get_k_length_array().val
+        q_array = np.array([ks])
+    else:
+        for i in range(dim):
+            ks = np.minimum(shape[i] - np.arange(shape[i]) +
+                            1, np.arange(shape[i])) * dist[i]
+            fst_dims = (1,) * i
+            lst_dims = (1,) * (dim - i - 1)
+            q_array[i] += ks.reshape(fst_dims + (shape[i],) + lst_dims)
+
+    # Fill cepstrum field (all non-zero modes)
+    no_zero_modes = (slice(1, None),) * dim
+    ks = q_array[(slice(None),) + no_zero_modes]
+    cepstrum_field = np.zeros(shape)
+    cepstrum_field[no_zero_modes] = cepstrum(ks)
+
+    # Fill cepstrum field (zero-mode subspaces)
+    for i in range(dim):
+        # Prepare indices
+        fst_dims = (slice(None),) * i
+        lst_dims = (slice(None),) * (dim - i - 1)
+        sl = fst_dims + (slice(1, None),) + lst_dims
+        sl2 = fst_dims + (0,) + lst_dims
+
+        # Do summation
+        cepstrum_field[sl2] = np.sum(cepstrum_field[sl], axis=i)
+
+    return Field(domain, val=cepstrum_field)

nifty5/library/apply_data.py

+def ApplyData(data, var, model_data):
+    from .. import DiagonalOperator, Constant, sqrt
+    sqrt_n = DiagonalOperator(sqrt(var))
+    data = Constant(model_data.position, data)
+    return sqrt_n.inverse(model_data - data)

nifty5/library/point_sources.py

+import numpy as np
+from scipy.stats import invgamma, norm
+from ..field import Field
+from ..sugar import makeOp
+from ..multi import MultiField
+from ..model import Model
+
+from ..operators import SelectionOperator
+from ..utilities import memo
+
+
+class PointSources(Model):
+    def __init__(self, position, alpha, q):
+        super(PointSources, self).__init__(position)
+        self._alpha = alpha
+        self._q = q
+
+    def at(self, position):
+        return self.__class__(position, self._alpha, self._q)
+
+    @property
+    @memo
+    def value(self):
+        points = self.position['points'].to_global_data()
+        points = np.clip(points, None, 8.2)
+        points = Field(self.position['points'].domain, points)
+        return self.IG(points, self._alpha, self._q)
+
+    @property
+    @memo
+    def gradient(self):
+        u = self.position['points']
+        inner = norm.pdf(u.val)
+        outer_inv = invgamma.pdf(invgamma.ppf(norm.cdf(u.val),
+                                              self._alpha,
+                                              scale=self._q),
+                                 self._alpha, scale=self._q)
+        # FIXME
+        outer_inv = np.clip(outer_inv, 1e-20, None)
+        outer = 1/outer_inv
+        grad = Field(u.domain, val=inner*outer)
+        grad = makeOp(MultiField({'points': grad}))
+        return SelectionOperator(grad.target, 'points')*grad
+
+    @staticmethod
+    def IG(field, alpha, q):
+        foo = invgamma.ppf(norm.cdf(field.val), alpha, scale=q)
+        return Field(field.domain, val=foo)
+
+    @staticmethod
+    def IG_prime(field, alpha, q):
+        inner = norm.pdf(field.val)
+        outer = invgamma.pdf(invgamma.ppf(norm.cdf(field.val), alpha, scale=q), alpha, scale=q)
+        # # FIXME
+        # outer = np.clip(outer, 1e-20, None)
+        outer = 1/outer
+        return Field(field.domain, val=inner*outer)
+
+    @staticmethod
+    def inverseIG(u, alpha, q):
+        res = norm.ppf(invgamma.cdf(u, alpha, scale=q))
+        # # FIXME
+        # res = np.clip(res, 0, None)
+        return res

nifty5/library/smooth_sky.py

+
+
+def make_smooth_sky_model(s_space, amplitude_model):
+    '''
+    Method for construction of correlated sky model
+
+    Parameters
+    ----------
+    s_space : domain of sky model
+
+    amplitude_model : model for correlation structure
+    '''
+    from .. import (FFTOperator, Field, MultiField, PointwiseExponential,
+                    PowerDistributor, Variable)
+    h_space = s_space.get_default_codomain()
+    ht = FFTOperator(h_space, s_space)
+    p_space = amplitude_model.value.domain[0]
+    power_distributor = PowerDistributor(h_space, p_space)
+    position = {}
+    position['xi'] = Field.from_random('normal', h_space)
+    position['tau'] = amplitude_model.position['tau']
+    position['phi'] = amplitude_model.position['phi']
+    position = MultiField(position)
+
+    xi = Variable(position)['xi']
+    A = power_distributor(amplitude_model)
+    logsky_h = A * xi
+    logsky = ht(logsky_h)
+    internals = {'logsky_h': logsky_h,
+                 'power_distributor': power_distributor,
+                 'ht': ht}
+    return PointwiseExponential(logsky), internals
+
+
+def make_smooth_mf_sky_model(s_space_spatial, s_space_energy,
+                             amplitude_model_spatial, amplitude_model_energy):
+    '''
+    Method for construction of correlated sky model
+
+    Parameters
+    ----------
+    s_space : domain of sky model
+
+    amplitude_model : model for correlation structure
+    '''
+    from .. import (DomainTuple, Field, HarmonicTransformOperator, MultiField,
+                    PointwiseExponential, PowerDistributor, Variable)
+    from ..linear_operators import DomainDistributor
+    h_space_spatial = s_space_spatial.get_default_codomain()
+    h_space_energy = s_space_energy.get_default_codomain()
+    h_space = DomainTuple.make((h_space_spatial, h_space_energy))
+    ht1 = HarmonicTransformOperator(h_space, space=0)
+    ht2 = HarmonicTransformOperator(ht1.target, space=1)
+    ht = ht2*ht1
+
+    p_space_spatial = amplitude_model_spatial.value.domain[0]
+    p_space_energy = amplitude_model_energy.value.domain[0]
+
+    pd_spatial = PowerDistributor(h_space, p_space_spatial, 0)
+    pd_energy = PowerDistributor(pd_spatial.domain, p_space_energy, 1)
+    pd = pd_spatial*pd_energy
+
+    dom_distr_0 = DomainDistributor(pd.domain, 0)
+    dom_distr_1 = DomainDistributor(pd.domain, 1)
+    a_spatial = dom_distr_1(amplitude_model_spatial)
+    a_energy = dom_distr_0(amplitude_model_energy)
+    a = a_spatial*a_energy
+    A = pd(a)
+
+    position = MultiField({'xi': Field.from_random('normal', h_space)})
+    xi = Variable(position)['xi']
+    logsky_h = A*xi
+    logsky = ht(logsky_h)
+    return PointwiseExponential(logsky)

nifty5/operators/__init__.py

 from .diagonal_operator import DiagonalOperator
 from .dof_distributor import DOFDistributor
 from .endomorphic_operator import EndomorphicOperator
+from .exp_transform import ExpTransform
 from .fft_operator import FFTOperator
 from .fft_smoothing_operator import FFTSmoothingOperator
 from .geometry_remover import GeometryRemover
@@ -10,15 +11,20 @@ from .laplace_operator import LaplaceOperator
 from .linear_operator import LinearOperator
 from .multi_adaptor import MultiAdaptor
 from .power_distributor import PowerDistributor
+from .qht_operator import QHTOperator
 from .sampling_enabler import SamplingEnabler
 from .sandwich_operator import SandwichOperator
 from .scaling_operator import ScalingOperator
 from .selection_operator import SelectionOperator
+from .slope_operator import SlopeOperator
 from .smoothness_operator import SmoothnessOperator
+from .symmetrizing_operator import SymmetrizingOperator
 
 __all__ = ["LinearOperator", "EndomorphicOperator", "ScalingOperator",
            "DiagonalOperator", "HarmonicTransformOperator", "FFTOperator",
            "FFTSmoothingOperator", "GeometryRemover",
            "LaplaceOperator", "SmoothnessOperator", "PowerDistributor",
            "InversionEnabler", "SandwichOperator", "SamplingEnabler",
-           "DOFDistributor", "SelectionOperator", "MultiAdaptor"]
+           "DOFDistributor", "SelectionOperator", "MultiAdaptor",
+           "ExpTransform", "SymmetrizingOperator", "QHTOperator",
+           "SlopeOperator"]

nifty5/operators/exp_transform.py

+import numpy as np
+
+from ..domain_tuple import DomainTuple
+from ..domains import PowerSpace, RGSpace
+from ..field import Field
+from .linear_operator import LinearOperator
+
+
+class ExpTransform(LinearOperator):
+    def __init__(self, target, dof):
+
+        if not ((isinstance(target, RGSpace) and target.harmonic) or
+                isinstance(target, PowerSpace)):
+            raise ValueError(
+                "Target must be a harmonic RGSpace or a power space.")
+
+        if np.isscalar(dof):
+            dof = np.full(len(target.shape), int(dof), dtype=np.int)
+        dof = np.array(dof)
+        ndim = len(target.shape)
+
+        t_mins = np.empty(ndim)
+        bindistances = np.empty(ndim)
+        self._bindex = [None] * ndim
+        self._frac = [None] * ndim
+
+        for i in range(ndim):
+            if isinstance(target, RGSpace):
+                rng = np.arange(target.shape[i])
+                tmp = np.minimum(rng, target.shape[i] + 1 - rng)
+                k_array = tmp * target.distances[i]
+            else:
+                k_array = target.k_lengths
+
+            # avoid taking log of first entry
+            log_k_array = np.log(k_array[1:])
+
+            # Interpolate log_k_array linearly
+            t_max = np.max(log_k_array)
+            t_min = np.min(log_k_array)
+
+            # Save t_min for later
+            t_mins[i] = t_min
+
+            bindistances[i] = (t_max - t_min) / (dof[i] - 1)
+            coord = np.append(0., 1. + (log_k_array - t_min) / bindistances[i])
+            self._bindex[i] = np.floor(coord).astype(int)
+
+            # Interpolated value is computed via
+            # (1.-frac)*<value from this bin> + frac*<value from next bin>
+            # 0 <= frac < 1.
+            self._frac[i] = coord - self._bindex[i]
+
+        from ..domains import LogRGSpace
+        log_space = LogRGSpace(2 * dof + 1, bindistances,
+                               t_mins, harmonic=False)
+        self._target = DomainTuple.make(target)
+        self._domain = DomainTuple.make(log_space)
+
+    @property
+    def domain(self):
+        return self._domain
+
+    @property
+    def target(self):
+        return self._target
+
+    def apply(self, x, mode):
+        self._check_input(x, mode)
+        x = x.val
+        ndim = len(self.target.shape)
+        idx = ()
+        for d in range(ndim):
+            fst_dims = (1,) * d
+            lst_dims = (1,) * (ndim - d - 1)
+            wgt = self._frac[d].reshape(fst_dims + (-1,) + lst_dims)
+
+            # ADJOINT_TIMES
+            if mode == self.ADJOINT_TIMES:
+                shp = list(x.shape)
+                shp[d] = self._tgt(mode).shape[d]
+                xnew = np.zeros(shp, dtype=x.dtype)
+                np.add.at(xnew, idx + (self._bindex[d],), x * (1. - wgt))
+                np.add.at(xnew, idx + (self._bindex[d] + 1,), x * wgt)
+
+            # TIMES
+            else:
+                xnew = x[idx + (self._bindex[d],)] * (1. - wgt)
+                xnew += x[idx + (self._bindex[d] + 1,)] * wgt
+
+            x = xnew
+            idx = (slice(None),) + idx
+        return Field(self._tgt(mode), val=x)
+
+    @property
+    def capability(self):
+        return self.TIMES | self.ADJOINT_TIMES

nifty5/operators/qht_operator.py

+from ..domain_tuple import DomainTuple
+from ..field import Field
+from ..utilities import hartley
+from .linear_operator import LinearOperator
+
+
+class QHTOperator(LinearOperator):
+    def __init__(self, domain, target):
+        if not domain.harmonic:
+            raise TypeError(
+                "HarmonicTransformOperator only works on a harmonic space")
+        if target.harmonic:
+            raise TypeError("Target is not a codomain of domain")
+
+        from ..domains import LogRGSpace
+        if not isinstance(domain, LogRGSpace):
+            raise ValueError("Domain has to be a LogRGSpace!")
+        if not isinstance(target, LogRGSpace):
+            raise ValueError("Target has to be a LogRGSpace!")
+
+        self._domain = DomainTuple.make(domain)
+        self._target = DomainTuple.make(target)
+
+    @property
+    def domain(self):
+        return self._domain
+
+    @property
+    def target(self):
+        return self._target
+
+    def apply(self, x, mode):
+        self._check_input(x, mode)
+        x = x.val * self.domain[0].scalar_dvol()
+        n = len(self.domain[0].shape)
+        rng = range(n) if mode == self.TIMES else reversed(range(n))
+        for i in rng:
+            sl = (slice(None),)*i + (slice(1, None),)
+            x[sl] = hartley(x[sl], axes=(i,))
+
+        return Field(self._tgt(mode), val=x)
+
+    @property
+    def capability(self):
+        return self.TIMES | self.ADJOINT_TIMES

nifty5/operators/slope_operator.py

+import numpy as np
+
+from ..domain_tuple import DomainTuple
+from ..field import Field
+from .linear_operator import LinearOperator
+
+
+class SlopeOperator(LinearOperator):
+    def __init__(self, domain, target, sigmas):
+        self._domain = DomainTuple.make(domain)
+        self._target = DomainTuple.make(target)
+
+        if self.domain[0].shape != (len(self.target[0].shape) + 1,):
+            raise AssertionError("Shape mismatch!")
+
+        self._sigmas = sigmas
+        self.ndim = len(self.target[0].shape)
+        self.pos = np.zeros((self.ndim,) + self.target[0].shape)
+
+        if self.ndim == 1:
+            self.pos[0] = self.target[0].get_k_length_array().val
+        else:
+            shape = self.target[0].shape
+            for i in range(self.ndim):
+                rng = np.arange(target.shape[i])
+                tmp = np.minimum(
+                    rng, target.shape[i] + 1 - rng) * target.bindistances[i]
+                fst_dims = (1,) * i
+                lst_dims = (1,) * (self.ndim - i - 1)
+                self.pos[i] += tmp.reshape(fst_dims + (shape[i],) + lst_dims)
+
+    @property
+    def sigmas(self):
+        return self._sigmas
+
+    @property
+    def domain(self):
+        return self._domain
+