def __init__(self,
thread_count=1,
fast_inverse=True,
second_gen=False,
show_pysap_plots=False,
force_no_pysap=False):
"""
Load pySAP package if found, and initialize the Starlet transform.
:param thread_count: number of threads used for pySAP computations
:param fast_inverse: if True, reconstruction is simply the sum of each scale (only for 1st generation starlet transform)
:param second_gen: if True, uses the second generation of starlet transform
:param show_pysap_plots: if True, displays pySAP plots when calling the decomposition method
:param force_no_pysap: if True, does not load pySAP and computes starlet transforms in python.
"""
self.use_pysap, pysap = self._load_pysap(force_no_pysap)
if self.use_pysap:
self._transf_class = pysap.load_transform(
'BsplineWaveletTransformATrousAlgorithm')
else:
warnings.warn(
"The python package pySAP is not used for starlet operations. "
"They will be performed using (slower) python routines.")
self._fast_inverse = fast_inverse
self._second_gen = second_gen
self._show_pysap_plots = show_pysap_plots
self.interpol = Interpol()
self.thread_count = thread_count
def test_delete_cache(self):
x, y = util.make_grid(numPix=20, deltapix=1.)
gauss = Gaussian()
flux = gauss.function(x, y, amp=1., center_x=0., center_y=0., sigma=1.)
image = util.array2image(flux)
interp = Interpol()
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 0.,
'center_y': 0.
}
output = interp.function(x, y, **kwargs_interp)
assert hasattr(interp, '_image_interp')
interp.delete_cache()
assert not hasattr(interp, '_image_interp')
def test_function(self):
"""
:return:
"""
x, y = util.make_grid(numPix=20, deltapix=1.)
gauss = Gaussian()
flux = gauss.function(x, y, amp=1., center_x=0., center_y=0., sigma=1.)
image = util.array2image(flux)
interp = Interpol()
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 0.,
'center_y': 0.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_almost_equal(output, flux, decimal=0)
flux = gauss.function(x - 1.,
y,
amp=1.,
center_x=0.,
center_y=0.,
sigma=1.)
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 1.,
'center_y': 0.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_almost_equal(output, flux, decimal=0)
flux = gauss.function(x - 1.,
y - 1.,
amp=1,
center_x=0.,
center_y=0.,
sigma=1.)
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 1.,
'center_y': 1.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_almost_equal(output, flux, decimal=0)
out = interp.function(x=1000, y=0, **kwargs_interp)
assert out == 0
def __init__(self, light_model_list, smoothing=0.001):
"""
:param light_model_list: list of light models
:param smoothing: smoothing factor for certain models (deprecated)
"""
self.profile_type_list = light_model_list
self.func_list = []
for profile_type in light_model_list:
if profile_type == 'GAUSSIAN':
from lenstronomy.LightModel.Profiles.gaussian import Gaussian
self.func_list.append(Gaussian())
elif profile_type == 'GAUSSIAN_ELLIPSE':
from lenstronomy.LightModel.Profiles.gaussian import GaussianEllipse
self.func_list.append(GaussianEllipse())
elif profile_type == 'ELLIPSOID':
from lenstronomy.LightModel.Profiles.ellipsoid import Ellipsoid
self.func_list.append(Ellipsoid())
elif profile_type == 'MULTI_GAUSSIAN':
from lenstronomy.LightModel.Profiles.gaussian import MultiGaussian
self.func_list.append(MultiGaussian())
elif profile_type == 'MULTI_GAUSSIAN_ELLIPSE':
from lenstronomy.LightModel.Profiles.gaussian import MultiGaussianEllipse
self.func_list.append(MultiGaussianEllipse())
elif profile_type == 'SERSIC':
from lenstronomy.LightModel.Profiles.sersic import Sersic
self.func_list.append(Sersic(smoothing=smoothing))
elif profile_type == 'SERSIC_ELLIPSE':
from lenstronomy.LightModel.Profiles.sersic import SersicElliptic
self.func_list.append(
SersicElliptic(smoothing=smoothing,
sersic_major_axis=sersic_major_axis_conf))
elif profile_type == 'CORE_SERSIC':
from lenstronomy.LightModel.Profiles.sersic import CoreSersic
self.func_list.append(CoreSersic(smoothing=smoothing))
elif profile_type == 'SHAPELETS':
from lenstronomy.LightModel.Profiles.shapelets import ShapeletSet
self.func_list.append(ShapeletSet())
elif profile_type == 'SHAPELETS_POLAR':
from lenstronomy.LightModel.Profiles.shapelets_polar import ShapeletSetPolar
self.func_list.append(ShapeletSetPolar(exponential=False))
elif profile_type == 'SHAPELETS_POLAR_EXP':
from lenstronomy.LightModel.Profiles.shapelets_polar import ShapeletSetPolar
self.func_list.append(ShapeletSetPolar(exponential=True))
elif profile_type == 'HERNQUIST':
from lenstronomy.LightModel.Profiles.hernquist import Hernquist
self.func_list.append(Hernquist())
elif profile_type == 'HERNQUIST_ELLIPSE':
from lenstronomy.LightModel.Profiles.hernquist import HernquistEllipse
self.func_list.append(HernquistEllipse())
elif profile_type == 'PJAFFE':
from lenstronomy.LightModel.Profiles.p_jaffe import PJaffe
self.func_list.append(PJaffe())
elif profile_type == 'PJAFFE_ELLIPSE':
from lenstronomy.LightModel.Profiles.p_jaffe import PJaffe_Ellipse
self.func_list.append(PJaffe_Ellipse())
elif profile_type == 'UNIFORM':
from lenstronomy.LightModel.Profiles.uniform import Uniform
self.func_list.append(Uniform())
elif profile_type == 'POWER_LAW':
from lenstronomy.LightModel.Profiles.power_law import PowerLaw
self.func_list.append(PowerLaw())
elif profile_type == 'NIE':
from lenstronomy.LightModel.Profiles.nie import NIE
self.func_list.append(NIE())
elif profile_type == 'CHAMELEON':
from lenstronomy.LightModel.Profiles.chameleon import Chameleon
self.func_list.append(Chameleon())
elif profile_type == 'DOUBLE_CHAMELEON':
from lenstronomy.LightModel.Profiles.chameleon import DoubleChameleon
self.func_list.append(DoubleChameleon())
elif profile_type == 'TRIPLE_CHAMELEON':
from lenstronomy.LightModel.Profiles.chameleon import TripleChameleon
self.func_list.append(TripleChameleon())
elif profile_type == 'INTERPOL':
from lenstronomy.LightModel.Profiles.interpolation import Interpol
self.func_list.append(Interpol())
elif profile_type == 'SLIT_STARLETS':
from lenstronomy.LightModel.Profiles.starlets import SLIT_Starlets
self.func_list.append(
SLIT_Starlets(fast_inverse=True, second_gen=False))
elif profile_type == 'SLIT_STARLETS_GEN2':
from lenstronomy.LightModel.Profiles.starlets import SLIT_Starlets
self.func_list.append(SLIT_Starlets(second_gen=True))
else:
raise ValueError(
'No light model of type %s found! Supported are the following models: %s'
% (profile_type, _MODELS_SUPPORTED))
self._num_func = len(self.func_list)
def test_function(self):
"""
:return:
"""
for len_x, len_y in [(20, 20), (14, 20)]:
x, y = util.make_grid(numPix=(len_x, len_y), deltapix=1.)
gauss = Gaussian()
flux = gauss.function(x,
y,
amp=1.,
center_x=0.,
center_y=0.,
sigma=1.)
image = util.array2image(flux, nx=len_y, ny=len_x)
interp = Interpol()
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 0.,
'center_y': 0.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_equal(output, flux)
flux = gauss.function(x - 1.,
y,
amp=1.,
center_x=0.,
center_y=0.,
sigma=1.)
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 1.,
'center_y': 0.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_almost_equal(output, flux, decimal=0)
flux = gauss.function(x - 1.,
y - 1.,
amp=1,
center_x=0.,
center_y=0.,
sigma=1.)
kwargs_interp = {
'image': image,
'scale': 1.,
'phi_G': 0.,
'center_x': 1.,
'center_y': 1.
}
output = interp.function(x, y, **kwargs_interp)
npt.assert_almost_equal(output, flux, decimal=0)
out = interp.function(x=1000, y=0, **kwargs_interp)
assert out == 0
# test change of center without re-doing interpolation
out = interp.function(x=0,
y=0,
image=image,
scale=1.,
phi_G=0,
center_x=0,
center_y=0)
out_shift = interp.function(x=1,
y=0,
image=image,
scale=1.,
phi_G=0,
center_x=1,
center_y=0)
assert out_shift == out
# function must give a single value when evaluated at a single point
assert isinstance(out, float)
# test change of scale without re-doing interpolation
out = interp.function(x=1.,
y=0,
image=image,
scale=1.,
phi_G=0,
center_x=0,
center_y=0)
out_scaled = interp.function(x=2.,
y=0,
image=image,
scale=2,
phi_G=0,
center_x=0,
center_y=0)
assert out_scaled == out
def __init__(self,
light_model_list,
deflection_scaling_list=None,
source_redshift_list=None,
smoothing=0.0000001):
"""
:param light_model_list: list of light models
:param deflection_scaling_list: list of floats, rescales the original reduced deflection angles from the lens model
to enable different models to be placed at different optical (redshift) distances. None means they are all
:param source_redshift_list: list of redshifts of the model components
:param smoothing: smoothing factor for certain models (deprecated)
"""
self.profile_type_list = light_model_list
self.deflection_scaling_list = deflection_scaling_list
self.redshift_list = source_redshift_list
self.func_list = []
for profile_type in light_model_list:
if profile_type == 'GAUSSIAN':
from lenstronomy.LightModel.Profiles.gaussian import Gaussian
self.func_list.append(Gaussian())
elif profile_type == 'GAUSSIAN_ELLIPSE':
from lenstronomy.LightModel.Profiles.gaussian import GaussianEllipse
self.func_list.append(GaussianEllipse())
elif profile_type == 'MULTI_GAUSSIAN':
from lenstronomy.LightModel.Profiles.gaussian import MultiGaussian
self.func_list.append(MultiGaussian())
elif profile_type == 'MULTI_GAUSSIAN_ELLIPSE':
from lenstronomy.LightModel.Profiles.gaussian import MultiGaussianEllipse
self.func_list.append(MultiGaussianEllipse())
elif profile_type == 'SERSIC':
from lenstronomy.LightModel.Profiles.sersic import Sersic
self.func_list.append(Sersic(smoothing=smoothing))
elif profile_type == 'SERSIC_ELLIPSE':
from lenstronomy.LightModel.Profiles.sersic import SersicElliptic
self.func_list.append(SersicElliptic(smoothing=smoothing))
elif profile_type == 'CORE_SERSIC':
from lenstronomy.LightModel.Profiles.sersic import CoreSersic
self.func_list.append(CoreSersic(smoothing=smoothing))
elif profile_type == 'SHAPELETS':
from lenstronomy.LightModel.Profiles.shapelets import ShapeletSet
self.func_list.append(ShapeletSet())
elif profile_type == 'HERNQUIST':
from lenstronomy.LightModel.Profiles.hernquist import Hernquist
self.func_list.append(Hernquist())
elif profile_type == 'HERNQUIST_ELLIPSE':
from lenstronomy.LightModel.Profiles.hernquist import HernquistEllipse
self.func_list.append(HernquistEllipse())
elif profile_type == 'PJAFFE':
from lenstronomy.LightModel.Profiles.p_jaffe import PJaffe
self.func_list.append(PJaffe())
elif profile_type == 'PJAFFE_ELLIPSE':
from lenstronomy.LightModel.Profiles.p_jaffe import PJaffe_Ellipse
self.func_list.append(PJaffe_Ellipse())
elif profile_type == 'UNIFORM':
from lenstronomy.LightModel.Profiles.uniform import Uniform
self.func_list.append(Uniform())
elif profile_type == 'POWER_LAW':
from lenstronomy.LightModel.Profiles.power_law import PowerLaw
self.func_list.append(PowerLaw())
elif profile_type == 'NIE':
from lenstronomy.LightModel.Profiles.nie import NIE
self.func_list.append(NIE())
elif profile_type == 'CHAMELEON':
from lenstronomy.LightModel.Profiles.chameleon import Chameleon
self.func_list.append(Chameleon())
elif profile_type == 'DOUBLE_CHAMELEON':
from lenstronomy.LightModel.Profiles.chameleon import DoubleChameleon
self.func_list.append(DoubleChameleon())
elif profile_type == 'INTERPOL':
from lenstronomy.LightModel.Profiles.interpolation import Interpol
self.func_list.append(Interpol())
else:
raise ValueError('Warning! No light model of type',
profile_type, ' found!')
class SLIT_Starlets(object):
"""
Decomposition of an image using the Isotropic Undecimated Walevet Transform,
also known as "starlet" or "B-spline", using the 'a trous' algorithm.
Astronomical data (galaxies, stars, ...) are often very sparsely represented in the starlet basis.
Based on Starck et al. : https://ui.adsabs.harvard.edu/abs/2007ITIP...16..297S/abstract
"""
param_names = [
'amp', 'n_scales', 'n_pixels', 'scale', 'center_x', 'center_y'
]
lower_limit_default = {
'amp': [0],
'n_scales': 2,
'n_pixels': 5,
'center_x': -1000,
'center_y': -1000,
'scale': 0.000000001
}
upper_limit_default = {
'amp': [1e8],
'n_scales': 20,
'n_pixels': 1e10,
'center_x': 1000,
'center_y': 1000,
'scale': 10000000000
}
def __init__(self,
thread_count=1,
fast_inverse=True,
second_gen=False,
show_pysap_plots=False,
force_no_pysap=False):
"""
Load pySAP package if found, and initialize the Starlet transform.
:param thread_count: number of threads used for pySAP computations
:param fast_inverse: if True, reconstruction is simply the sum of each scale (only for 1st generation starlet transform)
:param second_gen: if True, uses the second generation of starlet transform
:param show_pysap_plots: if True, displays pySAP plots when calling the decomposition method
:param force_no_pysap: if True, does not load pySAP and computes starlet transforms in python.
"""
self.use_pysap, pysap = self._load_pysap(force_no_pysap)
if self.use_pysap:
self._transf_class = pysap.load_transform(
'BsplineWaveletTransformATrousAlgorithm')
else:
warnings.warn(
"The python package pySAP is not used for starlet operations. "
"They will be performed using (slower) python routines.")
self._fast_inverse = fast_inverse
self._second_gen = second_gen
self._show_pysap_plots = show_pysap_plots
self.interpol = Interpol()
self.thread_count = thread_count
def function(self,
x,
y,
amp=None,
n_scales=None,
n_pixels=None,
scale=1,
center_x=0,
center_y=0):
"""
1D inverse starlet transform from starlet coefficients stored in coeffs
Follows lenstronomy conventions for light profiles.
:param amp: decomposition coefficients ('amp' to follow conventions in other light profile)
This is an ndarray with shape (n_scales, sqrt(n_pixels), sqrt(n_pixels)) or (n_scales*n_pixels,)
:param n_scales: number of decomposition scales
:param n_pixels: number of pixels in a single scale
:return: reconstructed signal as 1D array of shape (n_pixels,)
"""
if len(amp.shape) == 1:
coeffs = util.array2cube(amp, n_scales, n_pixels)
elif len(amp.shape) == 3:
coeffs = amp
else:
raise ValueError(
"Starlets 'amp' has not the right shape (1D or 3D arrays are supported)"
)
image = self.function_2d(coeffs, n_scales, n_pixels)
image = self.interpol.function(x,
y,
image=image,
scale=scale,
center_x=center_x,
center_y=center_y,
amp=1,
phi_G=0)
return image
def function_2d(self, coeffs, n_scales, n_pixels):
"""
2D inverse starlet transform from starlet coefficients stored in coeffs
:param coeffs: decomposition coefficients,
ndarray with shape (n_scales, sqrt(n_pixels), sqrt(n_pixels))
:param n_scales: number of decomposition scales
:return: reconstructed signal as 2D array of shape (sqrt(n_pixels), sqrt(n_pixels))
"""
if self.use_pysap and not self._second_gen:
return self._inverse_transform(coeffs, n_scales, n_pixels)
else:
return starlets_util.inverse_transform(coeffs,
fast=self._fast_inverse,
second_gen=self._second_gen)
def decomposition(self, image, n_scales):
"""
1D starlet transform from starlet coefficients stored in coeffs
:param image: 2D image to be decomposed, ndarray with shape (sqrt(n_pixels), sqrt(n_pixels))
:param n_scales: number of decomposition scales
:return: reconstructed signal as 1D array of shape (n_scales*n_pixels,)
"""
if len(image.shape) == 1:
image_2d = util.array2image(image)
elif len(image.shape) == 2:
image_2d = image
else:
raise ValueError(
"image has not the right shape (1D or 2D arrays are supported for starlets decomposition)"
)
return util.cube2array(self.decomposition_2d(image_2d, n_scales))
def decomposition_2d(self, image, n_scales):
"""
2D starlet transform from starlet coefficients stored in coeffs
:param image: 2D image to be decomposed, ndarray with shape (sqrt(n_pixels), sqrt(n_pixels))
:param n_scales: number of decomposition scales
:return: reconstructed signal as 2D array of shape (n_scales, sqrt(n_pixels), sqrt(n_pixels))
"""
if self.use_pysap and not self._second_gen:
coeffs = self._transform(image, n_scales)
else:
coeffs = starlets_util.transform(image,
n_scales,
second_gen=self._second_gen)
return coeffs
def _inverse_transform(self, coeffs, n_scales, n_pixels):
"""reconstructs image from starlet coefficients"""
self._check_transform_pysap(n_scales, n_pixels)
if self._fast_inverse and not self._second_gen:
# for 1st gen starlet the reconstruction can be performed by summing all scales
image = np.sum(coeffs, axis=0)
else:
coeffs = self._coeffs2pysap(coeffs)
self._transf.analysis_data = coeffs
result = self._transf.synthesis()
if self._show_pysap_plots:
result.show()
image = result.data
return image
def _transform(self, image, n_scales):
"""decomposes an image into starlets coefficients"""
self._check_transform_pysap(n_scales, image.size)
self._transf.data = image
self._transf.analysis()
if self._show_pysap_plots:
self._transf.show()
coeffs = self._transf.analysis_data
coeffs = self._pysap2coeffs(coeffs)
return coeffs
def _check_transform_pysap(self, n_scales, n_pixels):
"""if needed, update the loaded pySAP transform to correct number of scales"""
if not hasattr(
self, '_transf'
) or n_scales != self._n_scales or n_pixels != self._n_pixels:
self._transf = self._transf_class(nb_scale=n_scales,
verbose=False,
nb_procs=self.thread_count)
self._n_scales = n_scales
self._n_pixels = n_pixels
def _pysap2coeffs(self, coeffs):
"""convert pySAP decomposition coefficients to numpy array"""
return np.asarray(coeffs)
def _coeffs2pysap(self, coeffs):
"""convert coefficients stored in numpy array to list required by pySAP"""
coeffs_list = []
for i in range(coeffs.shape[0]):
coeffs_list.append(coeffs[i, :, :])
return coeffs_list
def _load_pysap(self, force_no_pysap):
"""load pySAP module"""
if force_no_pysap:
return False, None
try:
import pysap
except ImportError:
return False, None
else:
return True, pysap
def delete_cache(self):
"""delete the cached interpolated image"""
self.interpol.delete_cache()
image_reconstructed = shapeletSet.function(x, y, coeff_ngc, n_max, beta, center_x=0, center_y=0)
image_reconstructed_2d = util.array2image(image_reconstructed)
theta_x_high_res, theta_y_high_res = util.make_grid(numPix=numPix*high_res_factor,
deltapix=deltaPix/high_res_factor)
beta_x_high_res, beta_y_high_res = lensModel.ray_shooting(theta_x_high_res, theta_y_high_res,
kwargs=kwargs_lens_list)
source_lensed = shapeletSet.function(beta_x_high_res, beta_y_high_res,
coeff_ngc, n_max, beta=.05,
center_x=cen[ii], center_y=0)
source_lensed = util.array2image(source_lensed)
kwargs_interp = {'image': ngc_data_resized, 'center_x': 0, 'center_y': 0, 'scale': 0.005, 'phi_G':0.2}
interp_light = Interpol()
source_lensed_interp = interp_light.function(beta_x_high_res, beta_y_high_res, **kwargs_interp)
source_lensed_interp = util.array2image(source_lensed_interp)
light_model_list = ['SERSIC_ELLIPSE', 'SERSIC_ELLIPSE','NIE']
kwargs_lens_light = [
{'amp': .3, 'R_sersic': 0.04, 'n_sersic': 0.3, 'e1': 0, 'e2': 0, 'center_x': 0, 'center_y': 0},
{'amp': .01, 'R_sersic': 0.05, 'n_sersic': 0.2, 'e1': 0, 'e2': 0, 'center_x': 0, 'center_y': 0},
{'amp': .05, 'e1':.5, 'e2':.4, 's_scale':1}
]
lensLightModel = LightModel(light_model_list=light_model_list)
flux_lens_light = lensLightModel.surface_brightness(theta_x_high_res, theta_y_high_res, kwargs_lens_light)
flux_lens_light = util.array2image(flux_lens_light)
image_combined = source_lensed_interp + flux_lens_light
