def drun(self, dlogz=0.1, ndim=4):
""" simple main function for sampling. """
# initialize our nested sampler
sampler = dynesty.NestedSampler(self.log_likelihood, likemod.pt_te,
ndim)
sampler.run_nested(dlogz=dlogz)
self.res = sampler.results
self.res.summary()
fig, _ = dyplot.runplot(self.res, lnz_error=False)
fig1, _ = dyplot.traceplot(self.res, truths=np.zeros(ndim), \
truth_color='black', show_titles=True, \
trace_cmap='viridis', connect=True, \
connect_highlight=range(10))
fig2, _ = dyplot.cornerplot(self.res, color='blue', \
truth_color='black', show_titles=True, \
max_n_ticks=3, quantiles=None)
fig.savefig('./output/evidence.png')
fig1.savefig('./output/tracers.png')
fig2.savefig('./output/cornerplot.png')
def fit(self,
log_likelihood,
start,
num_dim,
prior_transform,
save_dims=None,
uid=None):
import dynesty
filename = self.get_filename(uid)
if os.path.exists(filename):
self.logger.info("Not sampling, returning result from file.")
return self.load_file(filename)
self.logger.info("Sampling posterior now")
if save_dims is None:
save_dims = num_dim
self.logger.debug("Fitting framework with %d dimensions" % num_dim)
self.logger.info("Using dynesty Sampler")
sampler = dynesty.NestedSampler(log_likelihood,
prior_transform,
num_dim,
nlive=self.nlive)
sampler.run_nested(maxiter=self.max_iter, print_progress=False)
self.logger.debug("Fit finished")
dresults = sampler.results
chain = dresults["samples"]
weights = np.exp(dresults["logwt"] - dresults["logz"][-1])
max_weight = weights.max()
trim = max_weight / 1e5
mask = weights > trim
likelihood = dresults["logl"]
self._save(chain[mask, :], weights[mask], likelihood[mask], filename,
save_dims)
return {
"chain": chain[mask, :],
"weights": weights[mask],
"posterior": likelihood[mask]
}
def __call__(self, kwargs=dict()):
"""
Parameters
----------
kwargs : dict
extra input argument controlling sampling process
i.e., 'dlogz' for stopping criteria
Returns
-------
Dynesty sampling results
"""
log.debug('@ dynesty_pipeline::__call__')
# init dynesty
sampler = dynesty.NestedSampler(self._mpi_likelihood,
self.prior,
len(self._active_parameters),
**self._sampling_controllers)
sampler.run_nested(**kwargs)
return sampler.results
def run(self, dlogz=10):
"""Main method to combine short nested sampling and Emcee"""
ndim = len(self.labels)
print('Initial Nested sampling')
sampler = dynesty.NestedSampler(self._log_likelihood,
likemod.pt_te,
ndim,
nlive=100)
sampler.run_nested(dlogz=dlogz)
res = sampler.results
print("\nStarting Emcee")
initial_value = res['samples'][-1]
print("Initial values are:")
print("{:s} = {:f}".format(self.labels[0], initial_value[0]))
print("{:s} = {:f}".format(self.labels[1], initial_value[1]))
print("{:s} = {:f}".format(self.labels[2], initial_value[2]))
print("{:s} = {:f}".format(self.labels[3], initial_value[3]))
self._emcee_fit(initial_value)
def _run_test(self):
import dynesty
import pandas as pd
self.sampler = dynesty.NestedSampler(
loglikelihood=self.log_likelihood,
prior_transform=self.prior_transform,
ndim=self.ndim, **self.sampler_init_kwargs)
sampler_kwargs = self.sampler_function_kwargs.copy()
sampler_kwargs['maxiter'] = 2
self.sampler.run_nested(**sampler_kwargs)
N = 100
self.result.samples = pd.DataFrame(
self.priors.sample(N))[self.search_parameter_keys].values
self.result.nested_samples = self.result.samples
self.result.log_likelihood_evaluations = np.ones(N)
self.result.log_evidence = 1
self.result.log_evidence_err = 0.1
return self.result
def test_gaussianx(bound):
ndim = 3
rstate = get_rstate()
g = Gaussian(ndim=ndim)
sampler = dynesty.NestedSampler(g.loglikelihood,
g.prior_transform,
g.ndim,
nlive=nlive,
rstate=rstate,
bound=bound)
sampler.run_nested(print_progress=printing)
results = sampler.results
dyplot.boundplot(results,
dims=(0, 1)[:min(ndim, 2)],
it=1000,
prior_transform=g.prior_transform,
show_live=False)
dyplot.cornerbound(results,
it=3000,
prior_transform=g.prior_transform,
show_live=False)
def test_unravel():
# test unravel_run
ndim = 2
rstate = get_rstate()
sampler = dynesty.NestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
rstate=rstate)
sampler.run_nested(print_progress=printing)
dyutil.unravel_run(sampler.results)
sampler = dynesty.DynamicNestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
rstate=rstate)
sampler.run_nested(dlogz_init=1, maxcall=1000, print_progress=printing)
dyutil.unravel_run(sampler.results)
logps = sampler.results.logl
dyutil.reweight_run(sampler.results, logps / 4.)
def test_periodic():
# hard test of dynamic sampler with high dlogz_init and small number
# of live points
logz_true = np.log(np.sqrt(2 * np.pi) * erf(win / np.sqrt(2)) / (2 * win))
thresh = 5
ndim = 2
sampler = dynesty.DynamicNestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
periodic=[0])
sampler.run_nested(dlogz_init=1, print_progress=printing)
assert (np.abs(sampler.results.logz[-1] - logz_true) <
thresh * sampler.results.logzerr[-1])
sampler = dynesty.NestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
periodic=[0])
sampler.run_nested(dlogz=1, print_progress=printing)
assert (np.abs(sampler.results.logz[-1] - logz_true) <
thresh * sampler.results.logzerr[-1])
def test_unravel():
# hard test of dynamic sampler with high dlogz_init and small number
# of live points
ndim = 2
rstate = get_rstate()
sampler = dynesty.NestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
rstate=rstate)
sampler.run_nested()
dyutil.unravel_run(sampler.results)
sampler = dynesty.DynamicNestedSampler(loglike,
prior_transform,
ndim,
nlive=nlive,
rstate=rstate)
sampler.run_nested(dlogz_init=1, maxcall=1000)
dyutil.unravel_run(sampler.results)
logps = sampler.results.logl
dyutil.reweight_run(sampler.results, logps / 4.)
def run_sampler(self):
import dynesty
self.sampler = dynesty.NestedSampler(
loglikelihood=self.log_likelihood,
prior_transform=self.prior_transform,
ndim=self.ndim,
**self.sampler_init_kwargs)
if self.check_point:
out = self._run_external_sampler_with_checkpointing()
else:
out = self._run_external_sampler_without_checkpointing()
# Flushes the output to force a line break
if self.kwargs["verbose"]:
print("")
# self.result.sampler_output = out
weights = np.exp(out['logwt'] - out['logz'][-1])
nested_samples = DataFrame(out.samples,
columns=self.search_parameter_keys)
nested_samples['weights'] = weights
nested_samples['log_likelihood'] = out.logl
self.result.samples = dynesty.utils.resample_equal(
out.samples, weights)
self.result.nested_samples = nested_samples
self.result.log_likelihood_evaluations = self.reorder_loglikelihoods(
unsorted_loglikelihoods=out.logl,
unsorted_samples=out.samples,
sorted_samples=self.result.samples)
self.result.log_evidence = out.logz[-1]
self.result.log_evidence_err = out.logzerr[-1]
if self.plot:
self.generate_trace_plots(out)
return self.result
def test_gaussian():
sig = 5
rstate = get_rstate()
g = Gaussian()
sampler = dynesty.NestedSampler(g.loglikelihood,
g.prior_transform,
g.ndim,
nlive=nlive,
rstate=rstate)
sampler.run_nested(print_progress=printing)
# check that jitter/resample work
# for not dynamic sampler
dyfunc.jitter_run(sampler.results, rstate=rstate)
dyfunc.resample_run(sampler.results, rstate=rstate)
# add samples
# check continuation behavior
sampler.run_nested(dlogz=0.1, print_progress=printing)
# get errors
nerr = 3
result_list = []
for i in range(nerr):
sampler.reset()
sampler.run_nested(print_progress=False)
results = sampler.results
result_list.append(results)
pos = results.samples
wts = np.exp(results.logwt - results.logz[-1])
mean, cov = dyfunc.mean_and_cov(pos, wts)
logz = results.logz[-1]
assert (np.abs(logz - g.logz_truth) < sig * results.logzerr[-1])
res_comb = dyfunc.merge_runs(result_list)
assert (np.abs(res_comb.logz[-1] - g.logz_truth) <
sig * results.logzerr[-1])
# check summary
res = sampler.results
res.summary()
def test_bounding_sample(bound, sample):
# check various bounding methods
rstate = get_rstate()
if bound == 'none':
if sample != 'unif':
g = Gaussian(0.1)
else:
g = Gaussian(corr=0., prior_win=10)
# make live easy if bound is none
# but also not too easy so propose_point() is exercised
else:
g = Gaussian()
sampler = dynesty.NestedSampler(g.loglikelihood,
g.prior_transform,
g.ndim,
nlive=nlive,
bound=bound,
sample=sample,
rstate=rstate)
sampler.run_nested(print_progress=printing)
check_results_gau(sampler.results, g, rstate)
print(sampler.citations)
def plot(N1, prior_dist, H, dlogz_val, nlive_val, **prior_kwargs):
plt.figure(figsize=(15, 10))
plt.suptitle(' dlogz = ' + str(dlogz_val) + ', nlive = ' \
+ str(nlive_val), fontsize = 25, ha = 'center')
#prior transform (constant)
for i, n_values in enumerate(N1):
sum_val = generator(H, n_values) #total sum of Hval
def log_likelyhood(H):
return np.log(like_func(n_values, sum_val, H[0]))
#same as found in documentation:
ndim = 1 #number of dimensions in the problem
sampler = dynesty.NestedSampler(log_likelyhood, prior_dist, ndim, \
bound='single', nlive=nlive_val)
sampler.run_nested(dlogz=dlogz_val, print_progress=False)
results = sampler.results
x_axis = results.samples
y_axis = np.exp(results.logl)
plt.subplot(4, 4, i + 1)
plt.plot(x_axis, y_axis, '.', color="b")
plt.title('n_values = ' + str(n_values))
plt.xlabel('likelihood')
plt.ylabel('N0 of heads')
plt.tight_layout(rect=[0, 0.03, 1, 0.95])
#plt.savefig( "gaussian_0.5_0.2" + str(dlogz_val) +str(nlive_val) +".png", \
# dpi =300, bbox_inches = 'tight')
plt.show()
def test_gaussian():
logz_tol = 1
sampler = dynesty.NestedSampler(loglikelihood_gau,
prior_transform_gau,
ntotdim,
nlive=nlive,
ncdim=ndim_gau)
sampler.run_nested(print_progress=printing)
# check that jitter/resample/simulate_run work
# for not dynamic sampler
dyfunc.jitter_run(sampler.results)
dyfunc.resample_run(sampler.results)
dyfunc.simulate_run(sampler.results)
# add samples
# check continuation behavior
sampler.run_nested(dlogz=0.1, print_progress=printing)
# get errors
nerr = 2
result_list = []
for i in range(nerr):
sampler.reset()
sampler.run_nested(print_progress=False)
results = sampler.results
result_list.append(results)
pos = results.samples
wts = np.exp(results.logwt - results.logz[-1])
mean, cov = dyfunc.mean_and_cov(pos, wts)
logz = results.logz[-1]
assert (np.abs(logz - logz_truth_gau) < logz_tol)
res_comb = dyfunc.merge_runs(result_list)
assert (np.abs(res_comb.logz[-1] - logz_truth_gau) < logz_tol)
# check summary
res = sampler.results
res.summary()
def fit_gaia_data(name, gaia_data, clobber=False):
# We will fit for jitter parameters for each magnitude
jitter_vars = ["G", "BP", "RP"]
# Set up an isochrones model using the MIST tracks
mist = isochrones.get_ichrone("mist", bands=["G", "BP", "RP"])
mod = isochrones.SingleStarModel(mist, **gaia_data)
# Return the existing samples if not clobbering
output_dir = os.path.join(OUTPUT_DIR, __version__, name)
os.makedirs(output_dir, exist_ok=True)
fn = os.path.join(output_dir, "star.h5")
if (not clobber) and os.path.exists(fn):
mod._samples = pd.read_hdf(fn, "samples")
mod._derived_samples = pd.read_hdf(fn, "derived_samples")
return mod
with open(os.path.join(output_dir, "gaia.json"), "w") as f:
json.dump(
dict((k, v.tolist()) for k, v in gaia_data.items()),
f,
indent=2,
sort_keys=True,
)
# These functions wrap isochrones so that they can be used with dynesty:
def prior_transform(u):
cube = np.copy(u)
mod.mnest_prior(cube[: mod.n_params], None, None)
cube[mod.n_params :] = -10 + 20 * cube[mod.n_params :]
return cube
def loglike(theta):
ind0 = mod.n_params
lp0 = 0.0
for i, k in enumerate(jitter_vars):
err = np.sqrt(gaia_data[k][1] ** 2 + np.exp(theta[ind0 + i]))
lp0 -= 2 * np.log(err) # This is to fix a bug in isochrones
mod.kwargs[k] = (gaia_data[k][0], err)
lp = lp0 + mod.lnpost(theta[: mod.n_params])
if np.isfinite(lp):
return np.clip(lp, -1e10, np.inf)
return -1e10
# Run nested sampling on this model
sampler = dynesty.NestedSampler(
loglike, prior_transform, mod.n_params + len(jitter_vars)
)
strt = time.time()
sampler.run_nested()
total_time = (time.time() - strt) / 60.0
print("Sampling took {0} minutes".format(total_time))
# Resample the chain to get unit weight samples and update the isochrones
# model
results = sampler.results
samples = dynesty.utils.resample_equal(
results.samples, np.exp(results.logwt - results.logz[-1])
)
df = mod._samples = pd.DataFrame(
dict(
zip(
list(mod.param_names)
+ ["log_jitter_" + k for k in jitter_vars],
samples.T,
)
)
)
mod._derived_samples = mod.ic(*[df[c].values for c in mod.param_names])
mod._derived_samples["parallax"] = 1000.0 / df["distance"]
mod._derived_samples["distance"] = df["distance"]
mod._derived_samples["AV"] = df["AV"]
# Save these results to disk
mod._samples.to_hdf(fn, "samples")
mod._derived_samples.to_hdf(fn, "derived_samples")
# Save the summary to disk
mod._derived_samples.describe().transpose().to_csv(
os.path.join(output_dir, "star_summary.csv")
)
# Summarize the sampling performance
summary = dict(
nlive=int(results.nlive),
niter=int(results.niter),
ncall=int(sum(results.ncall)),
eff=float(results.eff),
logz=float(results.logz[-1]),
logzerr=float(results.logzerr[-1]),
total_time=float(total_time),
)
with open(
os.path.join(output_dir, "star_sampling_summary.json"), "w"
) as f:
json.dump(summary, f, indent=True, sort_keys=True)
return mod, sampler
def ns_fit(datadir):
#::: init
config.init(datadir)
#::: settings
nlive = config.BASEMENT.settings[
'ns_nlive'] # (default 500) number of live points
bound = config.BASEMENT.settings[
'ns_bound'] # (default 'single') use MutliNest algorithm for bounds
ndim = config.BASEMENT.ndim # number of parameters
sample = config.BASEMENT.settings[
'ns_sample'] # (default 'auto') random walk sampling
tol = config.BASEMENT.settings[
'ns_tol'] # (defualt 0.01) the stopping criterion
#::: run
if config.BASEMENT.settings['ns_modus'] == 'static':
logprint('\nRunning Static Nested Sampler...')
logprint('--------------------------')
t0 = timer()
if config.BASEMENT.settings['multiprocess']:
with closing(
Pool(processes=(config.BASEMENT.
settings['multiprocess_cores']))) as pool:
logprint('\nRunning on',
config.BASEMENT.settings['multiprocess_cores'],
'CPUs.')
sampler = dynesty.NestedSampler(
ns_lnlike,
ns_prior_transform,
ndim,
pool=pool,
queue_size=config.BASEMENT.settings['multiprocess_cores'],
bound=bound,
sample=sample,
nlive=nlive)
sampler.run_nested(
dlogz=tol,
print_progress=config.BASEMENT.settings['print_progress'])
else:
sampler = dynesty.NestedSampler(ns_lnlike,
ns_prior_transform,
ndim,
bound=bound,
sample=sample,
nlive=nlive)
sampler.run_nested(
dlogz=tol,
print_progress=config.BASEMENT.settings['print_progress'])
t1 = timer()
timedynesty = (t1 - t0)
logprint("\nTime taken to run 'dynesty' (in static mode) is {} hours".
format(int(timedynesty / 60. / 60.)))
elif config.BASEMENT.settings['ns_modus'] == 'dynamic':
logprint('\nRunning Dynamic Nested Sampler...')
logprint('--------------------------')
t0 = timer()
if config.BASEMENT.settings['multiprocess']:
with closing(
Pool(processes=config.BASEMENT.
settings['multiprocess_cores'])) as pool:
logprint('\nRunning on',
config.BASEMENT.settings['multiprocess_cores'],
'CPUs.')
sampler = dynesty.DynamicNestedSampler(
ns_lnlike,
ns_prior_transform,
ndim,
pool=pool,
queue_size=config.BASEMENT.settings['multiprocess_cores'],
bound=bound,
sample=sample)
sampler.run_nested(
nlive_init=nlive,
dlogz_init=tol,
print_progress=config.BASEMENT.settings['print_progress'])
else:
sampler = dynesty.DynamicNestedSampler(ns_lnlike,
ns_prior_transform,
ndim,
bound=bound,
sample=sample)
sampler.run_nested(
nlive_init=nlive,
print_progress=config.BASEMENT.settings['print_progress'])
t1 = timer()
timedynestydynamic = (t1 - t0)
logprint(
"\nTime taken to run 'dynesty' (in dynamic mode) is {:.2f} hours".
format(timedynestydynamic / 60. / 60.))
#::: pickle-save the 'results' class
results = sampler.results
f = gzip.GzipFile(
os.path.join(config.BASEMENT.outdir, 'save_ns.pickle.gz'), 'wb')
pickle.dump(results, f)
f.close()
#::: return a German saying
try:
with open(
os.path.join(os.path.dirname(__file__), 'utils',
'quotes2.txt')) as dataset:
return (np.random.choice([l for l in dataset]))
except:
return ('42')
def pyorbit_dynesty(config_in, input_datasets=None, return_output=None):
output_directory = './' + config_in['output'] + '/dynesty/'
mc = ModelContainerDynesty()
pars_input(config_in, mc, input_datasets)
if mc.nested_sampling_parameters['shutdown_jitter']:
for dataset in mc.dataset_dict.itervalues():
dataset.shutdown_jitter()
mc.model_setup()
mc.create_variables_bounds()
mc.initialize_logchi2()
mc.create_starting_point()
results_analysis.results_resumen(mc, None, skip_theta=True)
mc.output_directory = output_directory
print()
print('Reference Time Tref: ', mc.Tref)
print()
print('*************************************************************')
print()
import dynesty
# "Standard" nested sampling.
sampler = dynesty.NestedSampler(mc.dynesty_call, mc.dynesty_priors,
mc.ndim)
sampler.run_nested()
results = sampler.results
# "Dynamic" nested sampling.
dsampler = dynesty.DynamicNestedSampler(mc.dynesty_call, mc.dynesty_priors,
mc.ndim)
dsampler.run_nested()
dresults = dsampler.results
from dynesty import plotting as dyplot
# Plot a summary of the run.
rfig, raxes = dyplot.runplot(results)
# Plot traces and 1-D marginalized posteriors.
tfig, taxes = dyplot.traceplot(results)
# Plot the 2-D marginalized posteriors.
cfig, caxes = dyplot.cornerplot(results)
from dynesty import utils as dyfunc
# Extract sampling results.
samples = results.samples # samples
weights = np.exp(results.logwt - results.logz[-1]) # normalized weights
# Compute 5%-95% quantiles.
quantiles = dyfunc.quantile(samples, [0.05, 0.95], weights=weights)
# Compute weighted mean and covariance.
mean, cov = dyfunc.mean_and_cov(samples, weights)
# Resample weighted samples.
samples_equal = dyfunc.resample_equal(samples, weights)
# Generate a new set of results with statistical+sampling uncertainties.
results_sim = dyfunc.simulate_run(results)
""" A dummy file is created to let the cpulimit script to proceed with the next step"""
nested_sampling_create_dummy_file(mc)
if return_output:
return mc
else:
return
mass_sum = np.sum(param_vector)
loglikeli = log_pdf(msqr1, DATA.m21_sqr,
DATA.m21_sqr_error) # Smaller mass gap
loglikeli += log_pdf(msqr2, DATA.m31_sqr,
DATA.m31_sqr_error) # Larger mass gap
loglikeli += log_pdf(mass_sum, DATA.sum_of_masses_offset,
DATA.sum_of_masses_one_sigma)
return loglikeli
# Move to separate script
sampler = dy.NestedSampler(loglikelihood=evaluate_log_likelihood_of_parameters,
prior_transform=prior_map,
ndim=3,
nlive=1_000,
bound='multi',
sample='auto')
sampler.run_nested(dlogz=0.01, maxiter=100_000)
sampler.results.summary()
# iter: 23487 | +1000 | bound: 65 | nc: 1 | ncall: 102516 | eff(%): 23.886 | loglstar: -inf < 22.634 < inf | logz: 3.769 +/- nan | dlogz: 0.000 > 0.010 Summary
# =======
# nlive: 1000
# niter: 23487
# ncall: 102516
# eff(%): 23.886
# logz: 3.769
def runsampler(self, samplerdict):
# pull out user defined sampler variables
npoints = samplerdict.get('npoints', 200)
samplertype = samplerdict.get('samplertype', 'multi')
bootstrap = samplerdict.get('bootstrap', 0)
update_interval = samplerdict.get('update_interval', 0.6)
samplemethod = samplerdict.get('samplemethod', 'unif')
delta_logz_final = samplerdict.get('delta_logz_final', 0.01)
flushnum = samplerdict.get('flushnum', 10)
maxiter = samplerdict.get('maxiter', sys.maxint)
# set start time
starttime = datetime.now()
if self.verbose:
print(
'Start Dynesty w/ {0} number of samples, Ndim = {1}, and w/ stopping criteria of dlog(z) = {2}: {3}'
.format(npoints, self.ndim, delta_logz_final, starttime))
sys.stdout.flush()
# initialize sampler object
dy_sampler = dynesty.NestedSampler(
lnprobfn,
self.priorobj.priortrans,
self.ndim,
logl_args=[self.likeobj, self.priorobj],
nlive=npoints,
bound=samplertype,
sample=samplemethod,
update_interval=update_interval,
bootstrap=bootstrap,
)
sys.stdout.flush()
ncall = 0
nit = 0
# start sampling
for it, results in enumerate(
dy_sampler.sample(dlogz=delta_logz_final)):
(worst, ustar, vstar, loglstar, logvol, logwt, logz, logzvar, h,
nc, worst_it, propidx, propiter, eff, delta_logz) = results
self.outff.write('{0} '.format(it))
self.outff.write(' '.join([str(q) for q in vstar]))
self.outff.write(' {0} {1} {2} {3} {4} {5} {6} '.format(
loglstar, logvol, logwt, h, nc, logz, delta_logz))
self.outff.write('\n')
ncall += nc
nit = it
if ((it % flushnum) == 0) or (it == maxiter):
self.outff.flush()
if self.verbose:
# format/output results
if logz < -1e6:
logz = -np.inf
if delta_logz > 1e6:
delta_logz = np.inf
if logzvar >= 0.:
logzerr = np.sqrt(logzvar)
else:
logzerr = np.nan
if logzerr > 1e6:
logzerr = np.inf
sys.stdout.write(
"\riter: {0:d} | nc: {1:d} | ncall: {2:d} | eff(%): {3:6.3f} | "
"logz: {4:6.3f} +/- {5:6.3f} | dlogz: {6:6.3f} > {7:6.3f} "
.format(nit, nc, ncall, eff, logz, logzerr, delta_logz,
delta_logz_final))
sys.stdout.flush()
if (it == maxiter):
break
# add live points to sampler object
for it2, results in enumerate(dy_sampler.add_live_points()):
# split up results
(worst, ustar, vstar, loglstar, logvol, logwt, logz, logzvar, h,
nc, worst_it, boundidx, bounditer, eff, delta_logz) = results
self.outff.write('{0} '.format(nit + it2))
self.outff.write(' '.join([str(q) for q in vstar]))
self.outff.write(' {0} {1} {2} {3} {4} {5} {6} '.format(
loglstar, logvol, logwt, h, nc, logz, delta_logz))
self.outff.write('\n')
ncall += nc
ncall += nc
if self.verbose:
# format/output results
if logz < -1e6:
logz = -np.inf
if delta_logz > 1e6:
delta_logz = np.inf
if logzvar >= 0.:
logzerr = np.sqrt(logzvar)
else:
logzerr = np.nan
if logzerr > 1e6:
logzerr = np.inf
sys.stdout.write(
"\riter: {:d} | nc: {:d} | ncall: {:d} | eff(%): {:6.3f} | "
"logz: {:6.3f} +/- {:6.3f} | dlogz: {:6.3f} > {:6.3f} "
.format(nit + it2, nc, ncall, eff, logz, logzerr,
delta_logz, delta_logz_final))
sys.stdout.flush()
self.outff.close()
sys.stdout.write('\n')
finishtime = datetime.now()
if self.verbose:
print('RUN TIME: {0}'.format(finishtime - starttime))
return dy_sampler
# global print_number
# if print_number < 100:
# print_number += 1
# print('parameter values:', x)
return x
# plot = True
from multiprocessing import Pool
ndim = len(theta_h2o)
full_results = []
with Pool() as pool:
for transit_data in noisey_transit_depth:
sampler = dynesty.NestedSampler(log_likelihood_h2o, prior_trans, ndim,
nlive=500, pool=pool, queue_size=pool._processes, logl_args=(transit_data, fixed_h2o))
sampler.run_nested()
full_results.append(sampler.results)
if plot:
# make a plot of results
labels = ["Rad_planet", "T", "log H2O"]
truths = [rad_planet, T, log_fh2o]
for result in full_results:
fig, axes = dyplot.cornerplot(result, truths=truths, show_titles=True,
title_kwargs={'y': 1.04}, labels=labels,
fig=plt.subplots(len(truths), len(truths), figsize=(10, 10)))
fig.suptitle('Red lines are true values', fontsize=14)
# fig.savefig('/test/my_first_cornerplot.png')
ifit = np.abs(imjdobs - t0_est) < 365
kfit = np.abs(kmjdobs - t0_est) < 365
model_kwargs = {
'step': 0.02,
't0': t0_est,
'ra': ra,
'dec': dec,
'motion_mode': 'parallactic',
'occulter_mode': 'solid',
}
ecl_model_V = model_eclipse(mjd_points=vmjdobs[vfit], mu=1.20, **model_kwargs)
ecl_model_I = model_eclipse(mjd_points=imjdobs[ifit], mu=1.10, **model_kwargs)
ecl_model_K = model_eclipse(mjd_points=kmjdobs[kfit], mu=1.05, **model_kwargs)
with Pool(processes=nproc) as pool:
dsampler = dynesty.NestedSampler(
lnprob,
prior_transform,
ndim=11,
periodic=[7],
pool=pool,
queue_size=nproc,
logl_args=[[ecl_model_V, ecl_model_I, ecl_model_K],
[vflux[vfit], iflux[ifit], kflux[kfit]],
[vflux_error[vfit], iflux_error[ifit], kflux_error[kfit]]])
dsampler.run_nested()
dres = dsampler.results
pickle.dump(dres, open("dres_advanced_solid_corner.p", "wb"))
def fit_source(ra=53.115295, dec=-27.803501, dofit=True, nlive=100):
# --- Build the postage stamp ----
ra_init, dec_init = ra, dec
pos_init = (ra_init, dec_init)
stamps = [
make_stamp(im,
pos_init,
center_type='celestial',
size=(50, 50),
psfname=psfname) for im in imnames
]
# override the psf to reflect in both directions
T = -1.0 * np.eye(2)
for s in stamps:
s.psf.covariances = np.matmul(T, np.matmul(s.psf.covariances, T.T))
s.psf.means = np.matmul(s.psf.means, T)
# --- get the Scene ---
source = Star(filters=["F090W"])
scene = Scene([source])
label = ['Counts', 'RA', 'Dec']
plans = [WorkPlan(stamp) for stamp in stamps]
lnlike = argfix(lnlike_multi, scene=scene, plans=plans, grad=False)
# --- Initialize ---
theta_init = np.array(
[stamps[0].pixel_values.sum() * 1.0, ra_init, dec_init])
# a rough measure of dcoordinate/dpix
plate_scale, _ = np.linalg.eig(np.linalg.inv(stamps[0].dpix_dsky))
# make the prior ~10 pixels wide, and 50% of counts
theta_width = np.array(
[0.5 * theta_init[0], 10 * plate_scale[0], 10 * plate_scale[1]])
#print(theta_init, theta_width)
# --- Nested sampling ---
ndim = 3
def prior_transform(unit_coords):
# convert to uniform -1 to 1
u = (2 * unit_coords - 1.)
# now scale and shift
theta = theta_init + theta_width * u
return theta
if dofit:
import dynesty, time
# "Standard" nested sampling.
sampler = dynesty.NestedSampler(lnlike,
prior_transform,
ndim,
nlive=nlive,
bootstrap=0)
t0 = time.time()
sampler.run_nested()
dur = time.time() - t0
results = sampler.results
results['duration'] = dur
indmax = results['logl'].argmax()
theta_max = results['samples'][indmax, :]
else:
results = None
theta_max = np.zeros(3)
stamps = None
return results, theta_max, stamps, scene
PC= Full_scale(Gs, Pmfl)
Gchi, Pchi = Full_fit(Gs, PC * Gmfl, PC * Pmfl)
return -0.5 * (Gchi + Pchi)
############## ############
############## redshift run ############
sp = fsps.StellarPopulation(imf_type = 2, tpagb_norm_type=0, zcontinuous = 1, logzsol = np.log10(1), sfh = 4, tau = 0.1)
Gs = Gen_spec(field, galaxy, 1, g102_lims=[8300, 11288], g141_lims=[11288, 16500],mdl_err = False,
phot_errterm = 0.03, decontam = True)
wvs, flxs, errs, beams, trans = Gather_grism_data(Gs)
zsampler = dynesty.NestedSampler( rshift_loglikelihood, rshift_prior, ndim = 5, sample = 'rwalk', bound = 'balls')
zsampler.run_nested(print_progress=False)
zres = zsampler.results
t,pt = Get_posterior(zres.samples[:,3 ],zres.logwt,zres.logz)
specz = t[pt == max(pt)][0]
agelim = Oldest_galaxy(specz)
LBT = Time_bins(agelim)
############## ############
############## bestfit run ############
sp = fsps.StellarPopulation(imf_type = 2, tpagb_norm_type=0, zcontinuous = 1, logzsol = np.log10(1), sfh = 3, dust_type = 1)
Gs = Gen_spec(field, galaxy, 1, g102_lims=[8300, 11288], g141_lims=[11288, 16500],mdl_err = False,
phot_errterm = 0.0, decontam = True)
def ns_fit(datadir):
#::: init
config.init(datadir)
#::: show initial guess
show_initial_guess()
#::: settings
nlive = config.BASEMENT.settings[
'ns_nlive'] # (default 500) number of live points
bound = config.BASEMENT.settings[
'ns_bound'] # (default 'single') use MutliNest algorithm for bounds
ndim = config.BASEMENT.ndim # number of parameters
sample = config.BASEMENT.settings[
'ns_sample'] # (default 'auto') random walk sampling
tol = config.BASEMENT.settings[
'ns_tol'] # (defualt 0.01) the stopping criterion
#::: run
if config.BASEMENT.settings['ns_modus'] == 'static':
logprint('\nRunning Static Nested Sampler...')
logprint('--------------------------')
t0 = timer()
if config.BASEMENT.settings['multiprocess']:
with closing(
Pool(processes=(config.BASEMENT.
settings['multiprocess_cores']))) as pool:
logprint('\nRunning on',
config.BASEMENT.settings['multiprocess_cores'],
'CPUs.')
sampler = dynesty.NestedSampler(
ns_lnlike,
ns_prior_transform,
ndim,
pool=pool,
queue_size=config.BASEMENT.settings['multiprocess_cores'],
bound=bound,
sample=sample,
nlive=nlive)
sampler.run_nested(dlogz=tol, print_progress=True)
else:
sampler = dynesty.NestedSampler(ns_lnlike,
ns_prior_transform,
ndim,
bound=bound,
sample=sample,
nlive=nlive)
sampler.run_nested(dlogz=tol, print_progress=True)
t1 = timer()
timedynesty = (t1 - t0)
logprint("\nTime taken to run 'dynesty' (in static mode) is {} hours".
format(int(timedynesty / 60. / 60.)))
elif config.BASEMENT.settings['ns_modus'] == 'dynamic':
logprint('\nRunning Dynamic Nested Sampler...')
logprint('--------------------------')
t0 = timer()
if config.BASEMENT.settings['multiprocess']:
with closing(
Pool(processes=config.BASEMENT.
settings['multiprocess_cores'])) as pool:
logprint('\nRunning on',
config.BASEMENT.settings['multiprocess_cores'],
'CPUs.')
sampler = dynesty.DynamicNestedSampler(
ns_lnlike,
ns_prior_transform,
ndim,
pool=pool,
queue_size=config.BASEMENT.settings['multiprocess_cores'],
bound=bound,
sample=sample)
sampler.run_nested(nlive_init=nlive,
dlogz_init=tol,
print_progress=True)
else:
sampler = dynesty.DynamicNestedSampler(ns_lnlike,
ns_prior_transform,
ndim,
bound=bound,
sample=sample)
sampler.run_nested(nlive_init=nlive, print_progress=True)
t1 = timer()
timedynestydynamic = (t1 - t0)
logprint("\nTime taken to run 'dynesty' (in dynamic mode) is {} hours".
format(int(timedynestydynamic / 60. / 60.)))
#::: pickle-save the 'results' class
results = sampler.results
with open(os.path.join(config.BASEMENT.outdir, 'save_ns.pickle'),
'wb') as f:
pickle.dump(results, f)
def _runsampler(self,samplerdict):
# pull out user defined sampler variables
npoints = samplerdict.get('npoints',200)
samplertype = samplerdict.get('samplerbounds','multi')
bootstrap = samplerdict.get('bootstrap',0)
update_interval = samplerdict.get('update_interval',0.6)
samplemethod = samplerdict.get('samplemethod','unif')
delta_logz_final = samplerdict.get('delta_logz_final',0.01)
flushnum = samplerdict.get('flushnum',10)
numslice = samplerdict.get('slices',5)
numwalks = samplerdict.get('walks',25)
reflective_list = samplerdict.get('reflective',[])
# calc index of reflective prior par
reflective = []
for ii,par in enumerate(self.likeobj.fitpars_i):
if self.fitpars_bool[par] and (par in reflective_list):
reflective.append(ii)
try:
# Python 2.x
maxiter = samplerdict.get('maxiter',sys.maxint)
except AttributeError:
# Python 3.x
maxiter = samplerdict.get('maxiter',sys.maxsize)
try:
# Python 2.x
maxcall = samplerdict.get('maxcall',sys.maxint)
except AttributeError:
# Python 3.x
maxcall = samplerdict.get('maxcall',sys.maxsize)
n_effective = samplerdict.get('n_effective',np.inf)
if samplemethod == 'rwalk':
numws = numwalks
elif samplemethod == 'slice':
numws = numslice
else:
numws = numwalks
# set start time
starttime = datetime.now()
if self.verbose:
print(
'Static Dynesty w/ {0} sampler, {1} walks/slices, {2} number of samples, Ndim = {3}, and w/ stopping criteria of dlog(z) = {4}: {5}'.format(
samplemethod,numws,npoints,self.ndim,delta_logz_final,starttime))
print('Max Iter: {0} / Max Call: {1}'.format(maxiter,maxcall))
sys.stdout.flush()
# initialize sampler object
dy_sampler = dynesty.NestedSampler(
lnprobfn,
self.priorobj.priortrans,
self.ndim,
logl_args=[self.likeobj,self.priorobj],
nlive=npoints,
bound=samplertype,
sample=samplemethod,
# update_interval=update_interval,
bootstrap=bootstrap,
walks=numwalks,
slices=numslice,
# reflective=reflective,
# update_interval=10,
# first_update={'min_eff':5.0,'min_ncall':1000},
# vol_dec=4.0,
# vol_check=0.1,
)
sys.stdout.flush()
ncall = 0
nit = 0
iter_starttime = datetime.now()
deltaitertime_arr = []
# start sampling
print('Start Sampling @ {}'.format(iter_starttime))
for it, results in enumerate(dy_sampler.sample(
dlogz=delta_logz_final,
maxiter=maxiter,
maxcall=maxcall,
)):
(worst, ustar, vstar, loglstar, logvol, logwt, logz, logzvar,
h, nc, worst_it, propidx, propiter, eff, delta_logz) = results
if it == 0:
# initialize the output file
parnames = self.likeobj.parsdict.keys()
self._initoutput(parnames)
self.outff.write('{0} '.format(it))
# self.outff.write(' '.join([str(q) for q in vstar]))
try:
self.outff.write(
' '.join(
[str(self.likeobj.parsdict[q])
if (isinstance(self.likeobj.parsdict[q],float) or isinstance(self.likeobj.parsdict[q],int))
else 'nan' for q in parnames]))
except:
print('Sampling broke')
print('worst:',worst)
print('ustar:',ustar)
print('vstar:',vstar)
print('loglstar:',loglstar)
print('logvol:',logvol)
print('logwt:',logwt)
print('logz:',logz)
print('logzvar:',logzvar)
print('h:',h)
print('nc:',nc)
print('worst_it:',worst_it)
print('propidx:',propidx)
print('propiter:',propiter)
print('eff:',eff)
print('delta_logz:',delta_logz)
print(self.likeobj.parsdict)
raise
self.outff.write(' {0} {1} {2} {3} {4} {5} {6} '.format(
loglstar,logvol,logwt,h,nc,logz,delta_logz))
self.outff.write('\n')
ncall += nc
nit = it
deltaitertime_arr.append((datetime.now()-iter_starttime).total_seconds()/float(nc))
iter_starttime = datetime.now()
if ((it%flushnum) == 0) or (it == maxiter):
self.outff.flush()
if self.verbose:
# format/output results
if logz < -1e6:
logz = -np.inf
if delta_logz > 1e8:
delta_logz = np.inf
if logzvar > 0.:
logzerr = np.sqrt(logzvar)
else:
logzerr = np.nan
if logzerr > 1e8:
logzerr = np.inf
if loglstar < -1e6:
loglstar = -np.inf
try:
sys.stdout.write("\riter: {0:d} | nc: {1:d} | ncall: {2:d} | eff(%): {3:6.3f} | "
"logz: {4:6.3f} +/- {5:6.3f} | loglk: {6:6.3f} | dlogz: {7:6.3f} > {8:6.3f} | mean(time): {9:7.5f} | time: {10} \n"
.format(nit, nc, ncall, eff,
logz, logzerr, loglstar, delta_logz, delta_logz_final,np.mean(deltaitertime_arr),datetime.now()))
except:
print(nit, nc, ncall, eff, logz, logzerr)
sys.stdout.flush()
deltaitertime_arr = []
if (it == maxiter):
break
print('Add live points to output file')
# add live points to sampler object
for it2, results in enumerate(dy_sampler.add_live_points()):
# split up results
(worst, ustar, vstar, loglstar, logvol, logwt, logz, logzvar,
h, nc, worst_it, boundidx, bounditer, eff, delta_logz) = results
self.outff.write('{0} '.format(nit+it2))
# self.outff.write(' '.join([str(q) for q in vstar]))
self.likeobj.lnlikefn(vstar)
self.outff.write(
' '.join(
[str(self.likeobj.parsdict[q])
if (isinstance(self.likeobj.parsdict[q],float) or isinstance(self.likeobj.parsdict[q],int))
else 'nan' for q in parnames]))
# self.outff.write(' '.join([str(self.likeobj.parsdict[q]) for q in parnames]))
self.outff.write(' {0} {1} {2} {3} {4} {5} {6} '.format(
loglstar,logvol,logwt,h,nc,logz,delta_logz))
self.outff.write('\n')
ncall += nc
if self.verbose:
# format/output results
if logz < -1e6:
logz = -np.inf
if delta_logz > 1e6:
delta_logz = np.inf
if logzvar > 0.:
logzerr = np.sqrt(logzvar)
else:
logzerr = np.nan
if logzerr > 1e6:
logzerr = np.inf
sys.stdout.write("\riter: {:d} | nc: {:d} | ncall: {:d} | eff(%): {:6.3f} | "
"logz: {:6.3f} +/- {:6.3f} | dlogz: {:6.3f} > {:6.3f} "
.format(nit + it2, nc, ncall, eff,
logz, logzerr, delta_logz, delta_logz_final))
sys.stdout.flush()
self.outff.close()
sys.stdout.write('\n')
finishtime = datetime.now()
if self.verbose:
print('RUN TIME: {0}'.format(finishtime-starttime))
return dy_sampler
def fit(self,
sed,
e_sed,
parallax=[100, 0.001],
nlive=250,
distance=None,
binary=False,
plot_fit=True,
plot_trace=False,
plot_corner=False,
progress=False,
textx=0.025,
textsize=12):
if self.to_flux:
sed = self.mag_to_flux(sed)
e_sed = sed * e_sed # magnitude error to flux error
if not binary:
ndim = 3
def loglike(theta):
teff, logg, plx = theta
model = self.model_sed(teff, logg, plx)
ivar = 1 / e_sed**2
logchi = -0.5 * np.sum((sed - model)**2 * ivar)
if np.isnan(logchi):
return -np.Inf
else:
return logchi
def prior_transform(u):
x = np.array(u)
x[0] = u[0] * (self.teff_range[1] -
self.teff_range[0]) + self.teff_range[0]
x[1] = u[1] * (self.logg_range[1] -
self.logg_range[0]) + self.logg_range[0]
t = stats.norm.ppf(u[2])
x[2] = parallax[1] * t
x[2] += parallax[0]
return x
elif binary:
ndim = 5
def loglike(theta):
teff1, logg1, teff2, logg2, plx = theta
model = self.model_binary_sed(teff1, logg1, teff2, logg2, plx)
ivar = 1 / e_sed**2
logchi = -0.5 * np.sum((sed - model)**2 * ivar)
if np.isnan(logchi):
return -np.Inf
elif teff1 > teff2:
return -np.Inf
else:
return logchi
def prior_transform(u):
x = np.array(u)
x[0] = u[0] * (self.teff_range[1] -
self.teff_range[0]) + self.teff_range[0]
x[1] = u[1] * (self.logg_range[1] -
self.logg_range[0]) + self.logg_range[0]
x[2] = u[2] * (self.teff_range[1] -
self.teff_range[0]) + self.teff_range[0]
x[3] = u[3] * (self.logg_range[1] -
self.logg_range[0]) + self.logg_range[0]
t = stats.norm.ppf(u[4])
x[4] = parallax[1] * t
x[4] += parallax[0]
return x
########## DYNESTY ###################
dsampler = dynesty.NestedSampler(loglike,
prior_transform,
ndim=ndim,
nlive=nlive)
dsampler.run_nested(print_progress=progress)
result = dsampler.results
samples, weights = result.samples, np.exp(result.logwt -
result.logz[-1])
chis = -2 * np.array([loglike(sample) for sample in result.samples])
bestfit = np.argmin(chis)
resampled = dyfunc.resample_equal(samples, weights)
cov = np.var(resampled, axis=0)
mean = result.samples[bestfit]
print(result.samples[bestfit])
bandwls = []
for band in self.bands:
bandwls.append(self.mean_wl[band])
########## PLOTTING #################
if plot_trace:
f = dyplot.traceplot(dsampler.results,
show_titles=True,
trace_cmap='viridis')
plt.tight_layout()
if plot_corner:
if binary:
f = dyplot.cornerplot(dsampler.results,
show_titles=True,
labels=[
'$T_{\mathrm{eff,1}}$',
'$\log{g}_1$',
'$T_{\mathrm{eff,2}}$',
'$\log{g}_2$', r'$\varpi$'
])
if not binary:
f = dyplot.cornerplot(
dsampler.results,
show_titles=True,
labels=['$T_{\mathrm{eff}}$', '$\log{g}$', r'$\varpi$'])
plt.tight_layout()
if not binary:
model = self.model_sed(*mean)
ivar = 1 / e_sed**2
redchi = np.sum((sed - model)**2 * ivar) / (len(sed) - ndim)
if plot_fit:
plt.figure(figsize=(10, 5))
plt.errorbar(bandwls,
sed,
yerr=e_sed,
linestyle='none',
capsize=5,
color='k')
plt.scatter(bandwls, model, color='k')
plt.text(textx,
0.35,
'$T_{\mathrm{eff}}$ = %i ± %i' %
(mean[0], np.sqrt(cov[0])),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.25,
'$\log{g}$ = %.2f ± %.2f' %
(mean[1], np.sqrt(cov[1])),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.15,
'atm = %s' % (self.atm_type),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.05,
'$\chi_r^2$ = %.2f' % (redchi),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.xlabel('Wavelength ($\mathrm{\AA}$', fontsize=16)
plt.ylabel(
'$f_\lambda\ [erg\ cm^{-2}\ s^{-1}\ \mathrm{\AA}^{-1}]$',
fontsize=16)
plt.yscale('log')
return [mean[0], np.sqrt(cov[0]), mean[1], np.sqrt(cov[1])], redchi
elif binary:
model = self.model_binary_sed(*mean)
ivar = 1 / e_sed**2
redchi = np.sum((sed - model)**2 * ivar) / (len(sed) - ndim)
if plot_fit:
plt.figure(figsize=(10, 5))
plt.errorbar(bandwls,
sed,
yerr=e_sed,
linestyle='none',
capsize=5,
color='k')
plt.scatter(bandwls, model, color='k')
plt.text(textx,
0.45,
'$T_{\mathrm{eff,1}}$ = %i ± %i' %
(mean[0], np.sqrt(cov[0])),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.35,
'$\log{g}_1$ = %.2f ± %.2f' %
(mean[1], np.sqrt(cov[1])),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.25,
'$T_{\mathrm{eff,2}}$ = %i ± %i' %
(mean[2], np.sqrt(cov[2])),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.text(textx,
0.15,
'$\log{g}_2$ = %.2f ± %.2f' %
(mean[3], np.sqrt(cov[3])),
transform=plt.gca().transAxes,
fontsize=textsize)
#plt.text(0.15, 0.2, 'atm = %s' %(self.atm_type), transform = plt.gca().transAxes, fontsize = 12)
plt.text(textx,
0.05,
'$\chi_r^2$ = %.2f' % (redchi),
transform=plt.gca().transAxes,
fontsize=textsize)
plt.xlabel('Wavelength ($\mathrm{\AA}$)', fontsize=16)
plt.ylabel(
'$f_\lambda\ [erg\ cm^{-2}\ s^{-1}\ \mathrm{\AA}^{-1}]$',
fontsize=16)
plt.yscale('log')
return [
mean[0],
np.sqrt(cov[0]), mean[1],
np.sqrt(cov[1]), mean[2],
np.sqrt(cov[2]), mean[3],
np.sqrt(cov[3])
], redchi
def run_sampler(self):
import dynesty
import dill
logger.info("Using dynesty version {}".format(dynesty.__version__))
if self.kwargs.get("sample", "rwalk") == "rwalk":
logger.info(
"Using the bilby-implemented rwalk sample method with ACT estimated walks")
dynesty.dynesty._SAMPLING["rwalk"] = sample_rwalk_bilby
dynesty.nestedsamplers._SAMPLING["rwalk"] = sample_rwalk_bilby
if self.kwargs.get("walks") > self.kwargs.get("maxmcmc"):
raise DynestySetupError("You have maxmcmc > walks (minimum mcmc)")
if self.kwargs.get("nact", 5) < 1:
raise DynestySetupError("Unable to run with nact < 1")
elif self.kwargs.get("sample") == "rwalk_dynesty":
self._kwargs["sample"] = "rwalk"
logger.info(
"Using the dynesty-implemented rwalk sample method")
elif self.kwargs.get("sample") == "rstagger_dynesty":
self._kwargs["sample"] = "rstagger"
logger.info(
"Using the dynesty-implemented rstagger sample method")
self._setup_pool()
if self.resume:
self.resume = self.read_saved_state(continuing=True)
if self.resume:
logger.info('Resume file successfully loaded.')
else:
if self.kwargs['live_points'] is None:
self.kwargs['live_points'] = (
self.get_initial_points_from_prior(self.kwargs['nlive'])
)
self.sampler = dynesty.NestedSampler(
loglikelihood=_log_likelihood_wrapper,
prior_transform=_prior_transform_wrapper,
ndim=self.ndim, **self.sampler_init_kwargs
)
if self.check_point:
out = self._run_external_sampler_with_checkpointing()
else:
out = self._run_external_sampler_without_checkpointing()
self._close_pool()
# Flushes the output to force a line break
if self.kwargs["print_progress"] and self.kwargs["print_method"] == "tqdm":
self.pbar.close()
print("")
check_directory_exists_and_if_not_mkdir(self.outdir)
if self.nestcheck:
self.nestcheck_data(out)
dynesty_result = "{}/{}_dynesty.pickle".format(self.outdir, self.label)
with open(dynesty_result, 'wb') as file:
dill.dump(out, file)
self._generate_result(out)
self.result.sampling_time = self.sampling_time
if self.plot:
self.generate_trace_plots(out)
return self.result
def test_norstate():
# test it can work without rstate
ndim = 2
dynesty.NestedSampler(loglike, prior_transform, ndim, nlive=nlive)
dynesty.DynamicNestedSampler(loglike, prior_transform, ndim, nlive=nlive)
def __init__(self,
model,
nlive,
nprocesses=1,
checkpoint_time_interval=None,
maxcall=None,
loglikelihood_function=None,
use_mpi=False,
no_save_state=False,
run_kwds=None,
extra_kwds=None,
internal_kwds=None,
**kwargs):
self.model = model
self.no_save_state = no_save_state
log_likelihood_call, prior_call = setup_calls(
model,
loglikelihood_function=loglikelihood_function,
copy_prior=True)
# Set up the pool
self.pool = choose_pool(mpi=use_mpi, processes=nprocesses)
self.maxcall = maxcall
self.checkpoint_time_interval = checkpoint_time_interval
self.run_kwds = {} if run_kwds is None else run_kwds
self.extra_kwds = {} if extra_kwds is None else extra_kwds
self.internal_kwds = {} if internal_kwds is None else internal_kwds
self.nlive = nlive
self.names = model.sampling_params
self.ndim = len(model.sampling_params)
self.checkpoint_file = None
# Enable checkpointing if checkpoint_time_interval is set in config
# file in sampler section
if self.checkpoint_time_interval:
self.run_with_checkpoint = True
if self.maxcall is None:
self.maxcall = 5000 * self.pool.size
logging.info(
"Checkpointing enabled, will verify every %s calls"
" and try to checkpoint every %s seconds", self.maxcall,
self.checkpoint_time_interval)
else:
self.run_with_checkpoint = False
# Check for cyclic boundaries
periodic = []
cyclic = self.model.prior_distribution.cyclic
for i, param in enumerate(self.variable_params):
if param in cyclic:
logging.info('Param: %s will be cyclic', param)
periodic.append(i)
if len(periodic) == 0:
periodic = None
# Check for reflected boundaries. Dynesty only supports
# reflection on both min and max of boundary.
reflective = []
reflect = self.model.prior_distribution.well_reflected
for i, param in enumerate(self.variable_params):
if param in reflect:
logging.info("Param: %s will be well reflected", param)
reflective.append(i)
if len(reflective) == 0:
reflective = None
if 'sample' in extra_kwds:
if 'rwalk2' in extra_kwds['sample']:
dynesty.dynesty._SAMPLING["rwalk"] = sample_rwalk_mod
dynesty.nestedsamplers._SAMPLING["rwalk"] = sample_rwalk_mod
extra_kwds['sample'] = 'rwalk'
if self.nlive < 0:
# Interpret a negative input value for the number of live points
# (which is clearly an invalid input in all senses)
# as the desire to dynamically determine that number
self._sampler = dynesty.DynamicNestedSampler(log_likelihood_call,
prior_call,
self.ndim,
pool=self.pool,
reflective=reflective,
periodic=periodic,
**extra_kwds)
self.run_with_checkpoint = False
logging.info("Checkpointing not currently supported with"
"DYNAMIC nested sampler")
else:
self._sampler = dynesty.NestedSampler(log_likelihood_call,
prior_call,
self.ndim,
nlive=self.nlive,
reflective=reflective,
periodic=periodic,
pool=self.pool,
**extra_kwds)
self._sampler.kwargs.update(internal_kwds)
# properties of the internal sampler which should not be pickled
self.no_pickle = [
'loglikelihood', 'prior_transform', 'propose_point',
'update_proposal', '_UPDATE', '_PROPOSE', 'evolve_point',
'use_pool', 'queue_size', 'use_pool_ptform', 'use_pool_logl',
'use_pool_evolve', 'use_pool_update', 'pool', 'M'
]
def run_dynesty(self, data_to_fit, lnprob, nlive=200, bound='multi',
sample='auto', maxiter=None, maxcall=None, dlogz=None,
filepath='output.csv', **dynesty_kwargs):
'''
Runs nested sampling retrieval through Dynesty using the Classifier
to inform priors
Parameters
----------
data_to_fit : array_like, shape (X,)
The data you want to fit. Required for classification purposes.
lnprob : function
A function which must be passed a set of parameters and returns
their ln likelihood. Signature should be `lnprob(params)` where
params is an array with shape (n_variables, ). Note that you will
need to have hard-coded the data and associated uncertainties into
the `lnprob` function.
nlive : int, optional
The number of live points to use in the nested sampling. Default is
200.
bound : str, optional
Method used to approximately bound the prior using the current set
of live points. Conditions the sampling methods used to propose new
live points. Choices are no bound ('none'), a single bounding
ellipsoid ('single'), multiple bounding ellipsoids ('multi'), balls
centered on each live point ('balls'), and cubes centered on each
live point ('cubes'). Default is 'multi'.
sample : str, optional
Method used to sample uniformly within the likelihood constraint,
conditioned on the provided bounds. Unique methods available are:
uniform sampling within the bounds('unif'), random walks with fixed
proposals ('rwalk'), random walks with variable (“staggering”)
proposals ('rstagger'), multivariate slice sampling along preferred
orientations ('slice'), “random” slice sampling along all
orientations ('rslice'), and “Hamiltonian” slices along random
trajectories ('hslice'). 'auto' selects the sampling method based
on the dimensionality of the problem (from ndim). When ndim < 10,
this defaults to 'unif'. When 10 <= ndim <= 20, this defaults to
'rwalk'. When ndim > 20, this defaults to 'hslice' if a gradient is
provided and 'slice' otherwise. 'rstagger' and 'rslice' are
provided as alternatives for 'rwalk' and 'slice', respectively.
Default is 'auto'.
maxiter : int or None, optional
The maximum number of iterations to run. If None, will run until
stopping criterion is met. Default is None.
maxcall : int or None, optional
If not None, sets the maximum number of calls to the likelihood
function. Default is None.
**dynesty_kwargs : optional
kwargs to be passed to the dynesty.NestedSampler() initialisation
Returns
-------
results : dict
The dynesty results dictionary, with the addition of the following
attributes:
weights - normalised weights for each sample
cov - the covariance matrix
uncertainties - the uncertainty on each fitted parameter,
calculated from the square root of the diagonal of the
covariance matrix.
'''
# First up, we need to define some variables for the Retriever
# Number of dimensions we are retrieving
n_dims = self.classifier.n_variables + self.n_nuisance
# Make the prior transform function
prior_transform = self.classifier.create_dynesty_prior_transform(
data_to_fit, self.n_nuisance, self.nuisance_limits)
# Set up and run the sampler here!!
sampler = dynesty.NestedSampler(lnprob, prior_transform,
n_dims, bound=bound, sample=sample,
update_interval=float(n_dims), nlive=nlive,
**dynesty_kwargs)
sampler.run_nested(maxiter=maxiter, maxcall=maxcall, dlogz=dlogz)
results = sampler.results
# Get some normalised weights
results.weights = np.exp(results.logwt - results.logwt.max()) / \
np.sum(np.exp(results.logwt - results.logwt.max()))
# Calculate a covariance matrix for these results to get uncertainties
cov = np.cov(results.samples, rowvar=False, aweights=results.weights)
# Get the uncertainties from the diagonal of the covariance matrix
diagonal = np.diag(cov)
uncertainties = np.sqrt(diagonal)
# Add the covariance matrix and uncertainties to the results object
results.cov = cov
results.uncertainties = uncertainties
self._print_best(results)
self._save_results(results, filepath)
return results
