def fit(self):
dummy_data = np.zeros(1)
dummy_times = np.arange(1)
ui.load_arrays(1, dummy_times, dummy_data)
ui.set_method(self.method)
ui.get_method().config.update(sherpa_configs.get(self.method, {}))
ui.load_user_model(CalcModel(self.model), 'xijamod') # sets global xijamod
ui.add_user_pars('xijamod', self.model.parnames)
ui.set_model(1, 'xijamod')
calc_stat = CalcStat(self.model, self.child_pipe, self.maxiter)
ui.load_user_stat('xijastat', calc_stat, lambda x: np.ones_like(x))
ui.set_stat(xijastat)
# Set frozen, min, and max attributes for each xijamod parameter
for par in self.model.pars:
xijamod_par = getattr(xijamod, par.full_name)
xijamod_par.val = par.val
xijamod_par.frozen = par.frozen
xijamod_par.min = par.min
xijamod_par.max = par.max
if any(not par.frozen for par in self.model.pars):
try:
ui.fit(1)
calc_stat.message['status'] = 'finished'
fit_logger.info('Fit finished normally')
except FitTerminated as err:
calc_stat.message['status'] = 'terminated'
fit_logger.warning('Got FitTerminated exception {}'.format(err))
self.child_pipe.send(calc_stat.message)
def fit(self):
dummy_data = np.zeros(1)
dummy_times = np.arange(1)
ui.load_arrays(1, dummy_times, dummy_data)
ui.set_method(self.method)
ui.get_method().config.update(sherpa_configs.get(self.method, {}))
ui.load_user_model(CalcModel(self.model), 'xijamod') # sets global xijamod
ui.add_user_pars('xijamod', self.model.parnames)
ui.set_model(1, 'xijamod')
calc_stat = CalcStat(self.model, self.child_pipe)
ui.load_user_stat('xijastat', calc_stat, lambda x: np.ones_like(x))
ui.set_stat(xijastat)
# Set frozen, min, and max attributes for each xijamod parameter
for par in self.model.pars:
xijamod_par = getattr(xijamod, par.full_name)
xijamod_par.val = par.val
xijamod_par.frozen = par.frozen
xijamod_par.min = par.min
xijamod_par.max = par.max
if any(not par.frozen for par in self.model.pars):
try:
ui.fit(1)
calc_stat.message['status'] = 'finished'
logging.debug('Fit finished normally')
except FitTerminated as err:
calc_stat.message['status'] = 'terminated'
logging.debug('Got FitTerminated exception {}'.format(err))
self.child_pipe.send(calc_stat.message)
def fit(self, method='simplex'):
"""Initiate a fit of the model using Sherpa.
:param method: Method to be used to fit the model (e.g. simplex, levmar, or moncar)
"""
dummy_data = np.zeros(1)
dummy_times = np.arange(1)
ui.load_arrays(1, dummy_times, dummy_data)
ui.set_method(method)
ui.get_method().config.update(sherpa_configs.get(method, {}))
ui.load_user_model(CalcModel(self.model, self.fit_logger),
'xijamod') # sets global xijamod
ui.add_user_pars('xijamod', self.model.parnames)
ui.set_model(1, 'xijamod')
calc_stat = CalcStat(self.model, self.fit_logger)
ui.load_user_stat('xijastat', calc_stat, lambda x: np.ones_like(x))
ui.set_stat(xijastat)
# Set frozen, min, and max attributes for each xijamod parameter
for par in self.model.pars:
xijamod_par = getattr(xijamod, par.full_name)
xijamod_par.val = par.val
xijamod_par.frozen = par.frozen
xijamod_par.min = par.min
xijamod_par.max = par.max
ui.fit(1)
self.save_snapshot(fit_stat=calc_stat.min_fit_stat, method=method)
def fit_model(
model,
comm=None,
method='simplex',
config=None,
nofit=None,
freeze_pars=freeze_pars,
thaw_pars=[],
):
dummy_data = np.zeros(1)
dummy_times = np.arange(1)
ui.load_arrays(1, dummy_times, dummy_data)
ui.set_method(method)
ui.get_method().config.update(config or sherpa_configs.get(method, {}))
ui.load_user_model(CalcModel(model, comm), 'xijamod')
ui.add_user_pars('xijamod', model.parnames)
ui.set_model(1, 'xijamod')
fit_parnames = set()
for parname, parval in zip(model.parnames, model.parvals):
getattr(xijamod, parname).val = parval
fit_parnames.add(parname)
if any([re.match(x + '$', parname) for x in freeze_pars]):
fit_logger.info('Freezing ' + parname)
ui.freeze(getattr(xijamod, parname))
fit_parnames.remove(parname)
if any([re.match(x + '$', parname) for x in thaw_pars]):
fit_logger.info('Thawing ' + parname)
ui.thaw(getattr(xijamod, parname))
fit_parnames.add(parname)
if 'tau' in parname:
getattr(xijamod, parname).min = 0.1
calc_stat = CalcStat(model, comm)
ui.load_user_stat('xijastat', calc_stat, lambda x: np.ones_like(x))
ui.set_stat(xijastat)
if fit_parnames and not nofit:
ui.fit(1)
else:
model.calc()
def fit_model(model,
comm=None,
method='simplex',
config=None,
nofit=None,
freeze_pars=freeze_pars,
thaw_pars=[],
):
dummy_data = np.zeros(1)
dummy_times = np.arange(1)
ui.load_arrays(1, dummy_times, dummy_data)
ui.set_method(method)
ui.get_method().config.update(config or sherpa_configs.get(method, {}))
ui.load_user_model(CalcModel(model, comm), 'xijamod')
ui.add_user_pars('xijamod', model.parnames)
ui.set_model(1, 'xijamod')
fit_parnames = set()
for parname, parval in zip(model.parnames, model.parvals):
getattr(xijamod, parname).val = parval
fit_parnames.add(parname)
if any([re.match(x + '$', parname) for x in freeze_pars]):
fit_logger.info('Freezing ' + parname)
ui.freeze(getattr(xijamod, parname))
fit_parnames.remove(parname)
if any([re.match(x + '$', parname) for x in thaw_pars]):
fit_logger.info('Thawing ' + parname)
ui.thaw(getattr(xijamod, parname))
fit_parnames.add(parname)
if 'tau' in parname:
getattr(xijamod, parname).min = 0.1
calc_stat = CalcStat(model, comm)
ui.load_user_stat('xijastat', calc_stat, lambda x: np.ones_like(x))
ui.set_stat(xijastat)
if fit_parnames and not nofit:
ui.fit(1)
else:
model.calc()
def mwl_fit_high_level():
"""Use high-level Sherpa API.
High-level = session and convenience functions
Example: http://cxc.harvard.edu/sherpa/threads/simultaneous/
Example: http://python4astronomers.github.io/fitting/spectrum.html
"""
import sherpa.ui as ui
fermi_data = FermiData()
ui.load_arrays(fermi_data.name, fermi_data.x, fermi_data.y,
fermi_data.staterror)
ui.load_user_stat('fermi_stat', FermiStat.calc_stat,
FermiStat.calc_staterror)
# TODO: is there a good way to get the stat??
# ui.get_stat('fermi_stat')
# fermi_stat = ui._session._get_stat_by_name('fermi_stat')
ui.set_stat(fermi_stat)
# IPython.embed()
iact_data = IACTData()
ui.load_arrays(iact_data.name, iact_data.x, iact_data.y,
iact_data.staterror)
spec_model = ui.logparabola.spec_model
spec_model.c1 = 0.5
spec_model.c2 = 0.2
spec_model.ampl = 5e-11
ui.set_source(fermi_data.name, spec_model)
ui.set_source(iact_data.name, spec_model)
ui.notice(lo=1e-3, hi=None)
# IPython.embed()
ui.fit()
return dict(results=ui.get_fit_results(), model=spec_model)
def mwl_fit_high_level():
"""Use high-level Sherpa API.
High-level = session and convenience functions
Example: http://cxc.harvard.edu/sherpa/threads/simultaneous/
Example: http://python4astronomers.github.io/fitting/spectrum.html
"""
import sherpa.ui as ui
fermi_data = FermiData()
ui.load_arrays(fermi_data.name, fermi_data.x, fermi_data.y, fermi_data.staterror)
ui.load_user_stat('fermi_stat', FermiStat.calc_stat, FermiStat.calc_staterror)
# TODO: is there a good way to get the stat??
# ui.get_stat('fermi_stat')
# fermi_stat = ui._session._get_stat_by_name('fermi_stat')
ui.set_stat(fermi_stat)
# IPython.embed()
iact_data = IACTData()
ui.load_arrays(iact_data.name, iact_data.x, iact_data.y, iact_data.staterror)
spec_model = ui.logparabola.spec_model
spec_model.c1 = 0.5
spec_model.c2 = 0.2
spec_model.ampl = 5e-11
ui.set_source(fermi_data.name, spec_model)
ui.set_source(iact_data.name, spec_model)
ui.notice(lo=1e-3, hi=None)
# IPython.embed()
ui.fit()
return Bunch(results=ui.get_fit_results(), model=spec_model)
ui.set_model(data_id, '%s_mod' % ftype)
ui.load_arrays(data_id,
times,
failures[ftype])
fmod = ui.get_model_component('%s_mod' % ftype)
fmod.b.min = 0
fmod.b.max = 1
fmod.m.min = 0
fmod.m.max = 0.5
fmod.b.val=1e-7
ui.load_user_stat("loglike", llh, my_err)
ui.set_stat(loglike)
# the tricky part here is that the "model" is the probability polynomial
# we've defined evaluated at the data x values.
# the model and the data are passed to the user stat/ llh
# function as it is minimized.
ui.fit(data_id)
myfit = ui.get_fit_results()
#axplot[ftype] = ui.get_model_plot(data_id)
if myfit.succeeded:
import pickle
pickle.dump(myfit, open('%s_fitfile.pkl' % ftype, 'w'))
rep_file = open('%s_fitfile.json' % ftype, 'w')
rep_file.write(json.dumps(dict(time0=trend_start,
datestop=trend_date_stop,
ui.load_user_model(lim_line, '%s_mod' % ftype)
ui.add_user_pars('%s_mod' % ftype, ['m', 'b'])
ui.set_model(data_id, '%s_mod' % ftype)
ui.load_arrays(data_id, times, failures[ftype])
fmod = ui.get_model_component('%s_mod' % ftype)
fmod.b.min = 0
fmod.b.max = 1
fmod.m.min = 0
fmod.m.max = 0.5
fmod.b.val = 1e-7
ui.load_user_stat("loglike", llh, my_err)
ui.set_stat(loglike)
# the tricky part here is that the "model" is the probability polynomial
# we've defined evaluated at the data x values.
# the model and the data are passed to the user stat/ llh
# function as it is minimized.
ui.fit(data_id)
myfit = ui.get_fit_results()
#axplot[ftype] = ui.get_model_plot(data_id)
if myfit.succeeded:
import pickle
pickle.dump(myfit, open('%s_fitfile.pkl' % ftype, 'w'))
rep_file = open('%s_fitfile.json' % ftype, 'w')
rep_file.write(
json.dumps(dict(
