diff options
Diffstat (limited to 'fg21sim')
| -rw-r--r-- | fg21sim/configs/manager.py | 48 | ||||
| -rw-r--r-- | fg21sim/foregrounds.py | 56 | ||||
| -rw-r--r-- | fg21sim/galactic/synchrotron.py | 134 |
3 files changed, 121 insertions, 117 deletions
diff --git a/fg21sim/configs/manager.py b/fg21sim/configs/manager.py index 1cddb75..172811a 100644 --- a/fg21sim/configs/manager.py +++ b/fg21sim/configs/manager.py @@ -47,7 +47,8 @@ def _get_configspec(): def _flatten_dict(d, sep="/", parent_key=""): - """Recursively flatten a nested dictionary with keys compressed. + """ + Recursively flatten a nested dictionary with keys compressed. The dictionary is recursively flattened into a one-level dictionary, i.e., all the leaves are raised to the top level. @@ -104,7 +105,8 @@ def _flatten_dict(d, sep="/", parent_key=""): class ConfigManager: - """Manage the default configurations with specifications, as well as + """ + Manage the default configurations with specifications, as well as the user configurations. Both the default configurations and user configurations are validated @@ -139,7 +141,8 @@ class ConfigManager: userconfig = None def __init__(self, userconfig=None): - """Load the bundled default configurations and specifications. + """ + Load the bundled default configurations and specifications. If the ``userconfig`` provided, the user configurations is also loaded, validated, and merged. """ @@ -156,7 +159,8 @@ class ConfigManager: self.read_userconfig(userconfig) def merge(self, config): - """Simply merge the given configurations without validation. + """ + Simply merge the given configurations without validation. Parameters ---------- @@ -172,7 +176,8 @@ class ConfigManager: self._config.merge(config) def read_config(self, config): - """Read, validate and merge the input config. + """ + Read, validate and merge the input config. Parameters ---------- @@ -191,7 +196,8 @@ class ConfigManager: logger.info("Loaded additional config") def read_userconfig(self, userconfig): - """Read user configuration file, validate, and merge into the + """ + Read user configuration file, validate, and merge into the default configurations. Parameters @@ -235,7 +241,8 @@ class ConfigManager: logger.warning("Reset the configurations to the copy of defaults!") def _validate(self, config): - """Validate the config against the specification using a default + """ + Validate the config against the specification using a default validator. The validated config values are returned if success, otherwise, the ``ConfigError`` raised with details. """ @@ -265,7 +272,8 @@ class ConfigManager: return config def check_all(self, raise_exception=True): - """Further check the whole configurations through a set of custom + """ + Further check the whole configurations through a set of custom checker functions, which may check one config option against its context if necessary to determine whether it has a valid value. @@ -303,7 +311,8 @@ class ConfigManager: return config.get(key, fallback) def getn(self, key, from_default=False): - """Get the value of a config option specified by the input key from + """ + Get the value of a config option specified by the input key from from the configurations which is a nested dictionary. Parameters @@ -343,7 +352,8 @@ class ConfigManager: raise KeyError("%s: invalid key" % "/".join(key)) def setn(self, key, value): - """Set the value of config option specified by a list of keys or a + """ + Set the value of config option specified by a list of keys or a "/"-separated keys string. The supplied key-value config pair is first used to create a @@ -408,7 +418,8 @@ class ConfigManager: key="/".join(key), val_new=val_new, val_old=val_old)) def get_path(self, key): - """Return the absolute path of the file/directory specified by the + """ + Return the absolute path of the file/directory specified by the config keys. Parameters @@ -456,7 +467,8 @@ class ConfigManager: @property def foregrounds(self): - """Get all available and enabled foreground components. + """ + Get all available and enabled foreground components. Returns ------- @@ -472,7 +484,8 @@ class ConfigManager: @property def frequencies(self): - """Get or calculate if ``frequency/type = custom`` the frequencies + """ + Get or calculate if ``frequency/type = custom`` the frequencies where to perform the simulations. Returns @@ -494,7 +507,8 @@ class ConfigManager: @property def logging(self): - """Get and prepare the logging configurations for + """ + Get and prepare the logging configurations for ``logging.basicConfig()`` to initialize the logging module. NOTE @@ -528,7 +542,8 @@ class ConfigManager: return logconf def dump(self, from_default=False, flatten=False): - """Dump the configurations as plain Python dictionary. + """ + Dump the configurations as plain Python dictionary. Parameters ---------- @@ -559,7 +574,8 @@ class ConfigManager: return data def save(self, outfile=None, clobber=False, backup=True): - """Save the configurations to file. + """ + Save the configurations to file. Parameters ---------- diff --git a/fg21sim/foregrounds.py b/fg21sim/foregrounds.py index 85242c1..2fceef6 100644 --- a/fg21sim/foregrounds.py +++ b/fg21sim/foregrounds.py @@ -21,7 +21,6 @@ from collections import OrderedDict import numpy as np import astropy.units as au from astropy.io import fits -import healpy as hp from .galactic import (Synchrotron as GalacticSynchrotron, FreeFree as GalacticFreeFree, @@ -29,14 +28,15 @@ from .galactic import (Synchrotron as GalacticSynchrotron, from .extragalactic import (GalaxyClusters as EGGalaxyClusters, PointSources as EGPointSources) from .products import Products -from .utils.fits import write_fits_healpix +from .sky import get_sky logger = logging.getLogger(__name__) class Foregrounds: - """Interface to the simulations of supported foreground components. + """ + Interface to the simulations of supported foreground components. All the enabled components are also combined to make the total foreground map, as controlled by the configurations. @@ -108,14 +108,15 @@ class Foregrounds: # self.filename_pattern = self.configs.getn("output/filename_pattern") self.use_float = self.configs.getn("output/use_float") + self.checksum = self.configs.getn("output/checksum") self.clobber = self.configs.getn("output/clobber") self.combine = self.configs.getn("output/combine") self.prefix = self.configs.getn("output/combine_prefix") self.output_dir = self.configs.get_path("output/output_dir") - self.nside = self.configs.getn("common/nside") def _make_filepath(self, **kwargs): - """Make the path of output file according to the filename pattern + """ + Make the path of output file according to the filename pattern and output directory loaded from configurations. """ data = { @@ -127,12 +128,12 @@ class Foregrounds: return filepath def _make_header(self): - """Make the header with detail information (e.g., parameters and + """ + Make the header with detail information (e.g., parameters and history) for the simulated products. """ header = fits.Header() - header["COMP"] = ("Combined foreground", - "Emission component") + header["COMP"] = ("Combined foreground", "Emission component") header.add_comment("COMPONENTS: " + ", ".join(self.components_id)) header["UNIT"] = ("Kelvin", "Map unit") header["CREATOR"] = (__name__, "File creator") @@ -146,20 +147,17 @@ class Foregrounds: self.header = header logger.info("Created FITS header") - def _output(self, hpmap, frequency): - """Write the simulated free-free map to disk with proper header + def _output(self, skymap, frequency): + """ + Write the simulated free-free map to disk with proper header keywords and history. Returns ------- - filepath : str - The (absolute) path to the output HEALPix map file. + outfile : str + The (absolute) path to the output sky map file. """ - if not os.path.exists(self.output_dir): - os.mkdir(self.output_dir) - logger.info("Created output dir: {0}".format(self.output_dir)) - # - filepath = self._make_filepath(frequency=frequency) + outfile = self._make_filepath(frequency=frequency) if not hasattr(self, "header"): self._make_header() header = self.header.copy() @@ -169,11 +167,12 @@ class Foregrounds: "File creation date" ) if self.use_float: - hpmap = hpmap.astype(np.float32) - write_fits_healpix(filepath, hpmap, header=header, - clobber=self.clobber) - logger.info("Write combined foreground to file: {0}".format(filepath)) - return filepath + skymap = skymap.astype(np.float32) + sky = get_sky(configs=self.configs) + sky.data = skymap + sky.header = header + sky.write(outfile, clobber=self.clobber, checksum=self.checksum) + return outfile def preprocess(self): """Perform the preparation procedures for the final simulations.""" @@ -183,7 +182,8 @@ class Foregrounds: comp_obj.preprocess() def simulate(self): - """Simulate the enabled components, as well as combine all the + """ + Simulate the enabled components, as well as combine all the simulated components to make up the total foregrounds. This is the *main interface* to the foreground simulations. @@ -195,22 +195,22 @@ class Foregrounds: In this way, less memory is required, since the number of components are generally much less than the number of frequency bins. """ - npix = hp.nside2npix(self.nside) + sky = get_sky(configs=self.configs) nfreq = len(self.frequencies) for freq_id, freq in enumerate(self.frequencies): logger.info("[#{0}/{1}] ".format(freq_id+1, nfreq) + "Simulating components at {freq} {unit} ...".format( freq=freq, unit=self.freq_unit)) if self.combine: - hpmap_comb = np.zeros(npix) + skymap_comb = np.zeros(shape=sky.shape) for comp_id, comp_obj in self.components.items(): - hpmap, filepath = comp_obj.simulate_frequency(freq) + skymap, filepath = comp_obj.simulate_frequency(freq) if filepath is not None: self.products.add_product(comp_id, freq_id, filepath) if self.combine: - hpmap_comb += hpmap + skymap_comb += skymap if self.combine: - filepath_comb = self._output(hpmap_comb, freq) + filepath_comb = self._output(skymap_comb, freq) self.products.add_product("combined", freq_id, filepath_comb) def postprocess(self): diff --git a/fg21sim/galactic/synchrotron.py b/fg21sim/galactic/synchrotron.py index af59539..7af9088 100644 --- a/fg21sim/galactic/synchrotron.py +++ b/fg21sim/galactic/synchrotron.py @@ -1,4 +1,4 @@ -# Copyright (c) 2016 Weitian LI <liweitianux@live.com> +# Copyright (c) 2016-2017 Weitian LI <weitian@aaronly.me> # MIT license """ @@ -14,7 +14,7 @@ from astropy.io import fits import astropy.units as au import healpy as hp -from ..utils.fits import read_fits_healpix, write_fits_healpix +from ..sky import get_sky logger = logging.getLogger(__name__) @@ -54,7 +54,8 @@ class Synchrotron: self.template_unit = au.Unit( self.configs.getn(comp+"/template_unit")) self.indexmap_path = self.configs.get_path(comp+"/indexmap") - self.smallscales = self.configs.getn(comp+"/add_smallscales") + self.add_smallscales = self.configs.getn(comp+"/add_smallscales") + self.smallscales_added = False self.lmin = self.configs.getn(comp+"/lmin") self.lmax = self.configs.getn(comp+"/lmax") self.prefix = self.configs.getn(comp+"/prefix") @@ -65,43 +66,24 @@ class Synchrotron: self.use_float = self.configs.getn("output/use_float") self.checksum = self.configs.getn("output/checksum") self.clobber = self.configs.getn("output/clobber") - self.nside = self.configs.getn("common/nside") self.freq_unit = au.Unit(self.configs.getn("frequency/unit")) # logger.info("Loaded and setup configurations") - def _load_template(self): - """Load the template map, and upgrade/downgrade the resolution - to match the output Nside. - """ - self.template, self.template_header = read_fits_healpix( - self.template_path) - template_nside = self.template_header["NSIDE"] - logger.info("Loaded template map from {0} (Nside={1})".format( - self.template_path, template_nside)) - # Upgrade/downgrade resolution - if template_nside != self.nside: - self.template = hp.ud_grade(self.template, nside_out=self.nside) - logger.info("Upgrade/downgrade template map from Nside " - "{0} to {1}".format(template_nside, self.nside)) + def _load_maps(self): + """Load the template map and spectral index map.""" + sky = get_sky(self.configs) + self.template = sky.load(self.template_path) + self.indexmap = sky.load(self.indexmap_path) - def _load_indexmap(self): - """Load the spectral index map, and upgrade/downgrade the resolution - to match the output Nside. + def _add_smallscales(self): """ - self.indexmap, self.indexmap_header = read_fits_healpix( - self.indexmap_path) - indexmap_nside = self.indexmap_header["NSIDE"] - logger.info("Loaded spectral index map from {0} (Nside={1})".format( - self.indexmap_path, indexmap_nside)) - # Upgrade/downgrade resolution - if indexmap_nside != self.nside: - self.indexmap = hp.ud_grade(self.indexmap, nside_out=self.nside) - logger.info("Upgrade/downgrade spectral index map from Nside " - "{0} to {1}".format(indexmap_nside, self.nside)) + Add fluctuations on small scales to the template map. - def _add_smallscales(self): - """Add fluctuations on small scales to the template map. + NOTE: + Only when the input template is a HEALPix map, this function + will be applied to add the small-scale fluctuations, which assuming + a angular power spectrum model. XXX/TODO: * Support using different models. @@ -114,7 +96,11 @@ class Synchrotron: "An improved source-subtracted and destriped 408-MHz all-sky map" Sec. 4.2: Small-scale fluctuations """ - if (not self.smallscales) or (hasattr(self, "hpmap_smallscales")): + if (not self.add_smallscales) or (self.smallscales_added): + return + if self.template.type_ != "healpix": + logger.warning("Input template map is NOT a HEALPix map; " + + "skip adding small-scale fluctuations!") return # To add small scale fluctuations # model: Remazeilles15 @@ -130,15 +116,16 @@ class Synchrotron: 1.0 - np.exp(-ell[ell_idx]**2 * sigma_tp**2)) cl[ell < self.lmin] = cl[self.lmin] # generate a realization of the Gaussian random field - gss = hp.synfast(cls=cl, nside=self.nside, new=True) + gss = hp.synfast(cls=cl, nside=self.template.nside, new=True) # whiten the Gaussian random field gss = (gss - gss.mean()) / gss.std() - self.hpmap_smallscales = alpha * gss * self.template**beta - self.template += self.hpmap_smallscales - logger.info("Added small-scale fluctuations") + hpmap_smallscales = alpha * gss * self.template.data**beta + self.template.data += hpmap_smallscales + logger.info("Added small-scale fluctuations to template map") def _make_filepath(self, **kwargs): - """Make the path of output file according to the filename pattern + """ + Make the path of output file according to the filename pattern and output directory loaded from configurations. """ data = { @@ -150,7 +137,8 @@ class Synchrotron: return filepath def _make_header(self): - """Make the header with detail information (e.g., parameters and + """ + Make the header with detail information (e.g., parameters and history) for the simulated products. """ header = fits.Header() @@ -168,20 +156,17 @@ class Synchrotron: self.header = header logger.info("Created FITS header") - def output(self, hpmap, frequency): - """Write the simulated synchrotron map to disk with proper + def output(self, skymap, frequency): + """ + Write the simulated synchrotron map to disk with proper header keywords and history. Returns ------- - filepath : str - The (absolute) path to the output HEALPix map file. + outfile : str + The (absolute) path to the output sky map file. """ - if not os.path.exists(self.output_dir): - os.mkdir(self.output_dir) - logger.info("Created output dir: {0}".format(self.output_dir)) - # - filepath = self._make_filepath(frequency=frequency) + outfile = self._make_filepath(frequency=frequency) if not hasattr(self, "header"): self._make_header() header = self.header.copy() @@ -191,14 +176,16 @@ class Synchrotron: "File creation date" ) if self.use_float: - hpmap = hpmap.astype(np.float32) - write_fits_healpix(filepath, hpmap, header=header, - clobber=self.clobber, checksum=self.checksum) - logger.info("Write simulated map to file: {0}".format(filepath)) - return filepath + skymap = skymap.astype(np.float32) + sky = self.template.copy() + sky.data = skymap + sky.header = header + sky.write(outfile, clobber=self.clobber, checksum=self.checksum) + return outfile def preprocess(self): - """Perform the preparation procedures for the final simulations. + """ + Perform the preparation procedures for the final simulations. Attributes ---------- @@ -211,54 +198,55 @@ class Synchrotron: return # logger.info("{name}: preprocessing ...".format(name=self.name)) - self._load_template() - self._load_indexmap() + self._load_maps() self._add_smallscales() # self._preprocessed = True def simulate_frequency(self, frequency): - """Transform the template map to the requested frequency, + """ + Transform the template map to the requested frequency, according to the spectral model and using an spectral index map. Returns ------- - hpmap_f : 1D `~numpy.ndarray` - The HEALPix map (RING ordering) at the input frequency. + skymap_f : 1D `~numpy.ndarray` + The sky map at the input frequency. filepath : str - The (absolute) path to the output HEALPix file if saved, + The (absolute) path to the output file if saved, otherwise ``None``. """ self.preprocess() # logger.info("Simulating {name} map at {freq} ({unit}) ...".format( name=self.name, freq=frequency, unit=self.freq_unit)) - hpmap_f = (self.template * - (frequency / self.template_freq) ** self.indexmap) + skymap_f = (self.template.data * + (frequency / self.template_freq) ** self.indexmap.data) # if self.save: - filepath = self.output(hpmap_f, frequency) + filepath = self.output(skymap_f, frequency) else: filepath = None - return (hpmap_f, filepath) + return (skymap_f, filepath) def simulate(self, frequencies): - """Simulate the synchrotron map at the specified frequencies. + """ + Simulate the synchrotron map at the specified frequencies. Returns ------- - hpmaps : list[1D `~numpy.ndarray`] - List of HEALPix maps (in RING ordering) at each frequency. + skymaps : list[1D `~numpy.ndarray`] + List of sky maps at each frequency. paths : list[str] - List of (absolute) path to the output HEALPix maps. + List of (absolute) path to the output sky maps. """ - hpmaps = [] + skymaps = [] paths = [] for f in np.array(frequencies, ndmin=1): - hpmap_f, filepath = self.simulate_frequency(f) - hpmaps.append(hpmap_f) + skymap_f, filepath = self.simulate_frequency(f) + skymaps.append(skymap_f) paths.append(filepath) - return (hpmaps, paths) + return (skymaps, paths) def postprocess(self): """Perform the post-simulation operations before the end.""" |