示例#1
0
def pool(request):
    multimode = 'None'
    # multimode = 'Serial'
    # multimode = 'Multi'
    # multimode = 'MPI'

    # setup code
    pool = None
    if multimode == 'Serial':
        from schwimmbad import SerialPool
        pool = SerialPool()
    elif multimode == 'Multi':
        from schwimmbad import MultiPool
        pool = MultiPool()
    elif multimode == 'MPI':
        from schwimmbad import MPIPool
        pool = MPIPool()
        if not pool.is_master():
            pool.wait()
            import sys
            sys.exit(0)

    # inject class variables
    request.cls.pool = pool
    yield

    # tear down
    if multimode == 'Multi' or multimode == 'MPI':
        pool.close()
示例#2
0
文件: fitter.py 项目: Hoptune/MOSFiT
class Fitter(object):
    """Fit transient events with the provided model."""

    _DEFAULT_SOURCE = {SOURCE.BIBCODE: '2017arXiv171002145G'}

    def __init__(self,
                 cuda=False,
                 exit_on_prompt=False,
                 language='en',
                 limiting_magnitude=None,
                 prefer_fluxes=False,
                 offline=False,
                 prefer_cache=False,
                 open_in_browser=False,
                 pool=None,
                 quiet=False,
                 test=False,
                 wrap_length=100,
                 **kwargs):
        """Initialize `Fitter` class."""
        self._pool = SerialPool() if pool is None else pool
        self._printer = Printer(pool=self._pool,
                                wrap_length=wrap_length,
                                quiet=quiet,
                                fitter=self,
                                language=language,
                                exit_on_prompt=exit_on_prompt)
        self._fetcher = Fetcher(test=test,
                                open_in_browser=open_in_browser,
                                printer=self._printer)

        self._cuda = cuda
        self._limiting_magnitude = limiting_magnitude
        self._prefer_fluxes = prefer_fluxes
        self._offline = offline
        self._prefer_cache = prefer_cache
        self._open_in_browser = open_in_browser
        self._quiet = quiet
        self._test = test
        self._wrap_length = wrap_length

        if self._cuda:
            try:
                import pycuda.autoinit  # noqa: F401
                import skcuda.linalg as linalg
                linalg.init()
            except ImportError:
                pass

    def fit_events(self,
                   events=[],
                   models=[],
                   max_time='',
                   time_list=[],
                   time_unit=None,
                   band_list=[],
                   band_systems=[],
                   band_instruments=[],
                   band_bandsets=[],
                   band_sampling_points=17,
                   iterations=10000,
                   num_walkers=None,
                   num_temps=1,
                   parameter_paths=['parameters.json'],
                   fracking=True,
                   frack_step=50,
                   burn=None,
                   post_burn=None,
                   gibbs=False,
                   smooth_times=-1,
                   extrapolate_time=0.0,
                   limit_fitting_mjds=False,
                   exclude_bands=[],
                   exclude_instruments=[],
                   exclude_systems=[],
                   exclude_sources=[],
                   exclude_kinds=[],
                   output_path='',
                   suffix='',
                   upload=False,
                   write=False,
                   upload_token='',
                   check_upload_quality=False,
                   variance_for_each=[],
                   user_fixed_parameters=[],
                   user_released_parameters=[],
                   convergence_type=None,
                   convergence_criteria=None,
                   save_full_chain=False,
                   draw_above_likelihood=False,
                   maximum_walltime=False,
                   start_time=False,
                   print_trees=False,
                   maximum_memory=np.inf,
                   speak=False,
                   return_fits=True,
                   extra_outputs=None,
                   walker_paths=[],
                   catalogs=[],
                   exit_on_prompt=False,
                   download_recommended_data=False,
                   local_data_only=False,
                   method=None,
                   seed=None,
                   **kwargs):
        """Fit a list of events with a list of models."""
        global model
        if start_time is False:
            start_time = time.time()

        self._seed = seed
        if seed is not None:
            np.random.seed(seed)

        self._start_time = start_time
        self._maximum_walltime = maximum_walltime
        self._maximum_memory = maximum_memory
        self._debug = False
        self._speak = speak
        self._download_recommended_data = download_recommended_data
        self._local_data_only = local_data_only

        self._draw_above_likelihood = draw_above_likelihood

        prt = self._printer

        event_list = listify(events)
        model_list = listify(models)

        if len(model_list) and not len(event_list):
            event_list = ['']

        # Exclude catalogs not included in catalog list.
        self._fetcher.add_excluded_catalogs(catalogs)

        if not len(event_list) and not len(model_list):
            prt.message('no_events_models', warning=True)

        # If the input is not a JSON file, assume it is either a list of
        # transients or that it is the data from a single transient in tabular
        # form. Try to guess the format first, and if that fails ask the user.
        self._converter = Converter(prt, require_source=upload)
        event_list = self._converter.generate_event_list(event_list)

        event_list = [x.replace('‑', '-') for x in event_list]

        entries = [[] for x in range(len(event_list))]
        ps = [[] for x in range(len(event_list))]
        lnprobs = [[] for x in range(len(event_list))]

        # Load walker data if provided a list of walker paths.
        walker_data = []

        if len(walker_paths):
            try:
                pool = MPIPool()
            except (ImportError, ValueError):
                pool = SerialPool()
            if pool.is_master():
                prt.message('walker_file')
                wfi = 0
                for walker_path in walker_paths:
                    if os.path.exists(walker_path):
                        prt.prt('  {}'.format(walker_path))
                        with codecs.open(walker_path, 'r',
                                         encoding='utf-8') as f:
                            all_walker_data = json.load(
                                f, object_pairs_hook=OrderedDict)

                        # Support both the format where all data stored in a
                        # single-item dictionary (the OAC format) and the older
                        # MOSFiT format where the data was stored in the
                        # top-level dictionary.
                        if ENTRY.NAME not in all_walker_data:
                            all_walker_data = all_walker_data[list(
                                all_walker_data.keys())[0]]

                        models = all_walker_data.get(ENTRY.MODELS, [])
                        choice = None
                        if len(models) > 1:
                            model_opts = [
                                '{}-{}-{}'.format(x['code'], x['name'],
                                                  x['date']) for x in models
                            ]
                            choice = prt.prompt('select_model_walkers',
                                                kind='select',
                                                message=True,
                                                options=model_opts)
                            choice = model_opts.index(choice)
                        elif len(models) == 1:
                            choice = 0

                        if choice is not None:
                            walker_data.extend([[
                                wfi, x[REALIZATION.PARAMETERS],
                                x.get(REALIZATION.WEIGHT)
                            ] for x in models[choice][MODEL.REALIZATIONS]])

                        for i in range(len(walker_data)):
                            if walker_data[i][2] is not None:
                                walker_data[i][2] = float(walker_data[i][2])

                        if not len(walker_data):
                            prt.message('no_walker_data')
                    else:
                        prt.message('no_walker_data')
                        if self._offline:
                            prt.message('omit_offline')
                        raise RuntimeError
                    wfi = wfi + 1

                for rank in range(1, pool.size + 1):
                    pool.comm.send(walker_data, dest=rank, tag=3)
            else:
                walker_data = pool.comm.recv(source=0, tag=3)
                pool.wait()

            if pool.is_master():
                pool.close()

        self._event_name = 'Batch'
        self._event_path = ''
        self._event_data = {}

        try:
            pool = MPIPool()
        except (ImportError, ValueError):
            pool = SerialPool()
        if pool.is_master():
            fetched_events = self._fetcher.fetch(
                event_list,
                offline=self._offline,
                prefer_cache=self._prefer_cache)

            for rank in range(1, pool.size + 1):
                pool.comm.send(fetched_events, dest=rank, tag=0)
            pool.close()
        else:
            fetched_events = pool.comm.recv(source=0, tag=0)
            pool.wait()

        for ei, event in enumerate(fetched_events):
            if event is not None:
                self._event_name = event.get('name', 'Batch')
                self._event_path = event.get('path', '')
                if not self._event_path:
                    continue
                self._event_data = self._fetcher.load_data(event)
                if not self._event_data:
                    continue

            if model_list:
                lmodel_list = model_list
            else:
                lmodel_list = ['']

            entries[ei] = [None for y in range(len(lmodel_list))]
            ps[ei] = [None for y in range(len(lmodel_list))]
            lnprobs[ei] = [None for y in range(len(lmodel_list))]

            if (event is not None and
                (not self._event_data or ENTRY.PHOTOMETRY
                 not in self._event_data[list(self._event_data.keys())[0]])):
                prt.message('no_photometry', [self._event_name])
                continue

            for mi, mod_name in enumerate(lmodel_list):
                for parameter_path in parameter_paths:
                    try:
                        pool = MPIPool()
                    except (ImportError, ValueError):
                        pool = SerialPool()
                    self._model = Model(model=mod_name,
                                        data=self._event_data,
                                        parameter_path=parameter_path,
                                        output_path=output_path,
                                        wrap_length=self._wrap_length,
                                        test=self._test,
                                        printer=prt,
                                        fitter=self,
                                        pool=pool,
                                        print_trees=print_trees)

                    if not self._model._model_name:
                        prt.message('no_models_avail', [self._event_name],
                                    warning=True)
                        continue

                    if not event:
                        prt.message('gen_dummy')
                        self._event_name = mod_name
                        gen_args = {
                            'name': mod_name,
                            'max_time': max_time,
                            'time_list': time_list,
                            'band_list': band_list,
                            'band_systems': band_systems,
                            'band_instruments': band_instruments,
                            'band_bandsets': band_bandsets
                        }
                        self._event_data = self.generate_dummy_data(**gen_args)

                    success = False
                    alt_name = None
                    while not success:
                        self._model.reset_unset_recommended_keys()
                        success = self._model.load_data(
                            self._event_data,
                            event_name=self._event_name,
                            smooth_times=smooth_times,
                            extrapolate_time=extrapolate_time,
                            limit_fitting_mjds=limit_fitting_mjds,
                            exclude_bands=exclude_bands,
                            exclude_instruments=exclude_instruments,
                            exclude_systems=exclude_systems,
                            exclude_sources=exclude_sources,
                            exclude_kinds=exclude_kinds,
                            time_list=time_list,
                            time_unit=time_unit,
                            band_list=band_list,
                            band_systems=band_systems,
                            band_instruments=band_instruments,
                            band_bandsets=band_bandsets,
                            band_sampling_points=band_sampling_points,
                            variance_for_each=variance_for_each,
                            user_fixed_parameters=user_fixed_parameters,
                            user_released_parameters=user_released_parameters,
                            pool=pool)

                        if not success:
                            break

                        if self._local_data_only:
                            break

                        # If our data is missing recommended keys, offer the
                        # user option to pull the missing data from online and
                        # merge with existing data.
                        urk = self._model.get_unset_recommended_keys()
                        ptxt = prt.text('acquire_recommended',
                                        [', '.join(list(urk))])
                        while event and len(urk) and (
                                alt_name or self._download_recommended_data
                                or prt.prompt(ptxt, [', '.join(urk)],
                                              kind='bool')):
                            try:
                                pool = MPIPool()
                            except (ImportError, ValueError):
                                pool = SerialPool()
                            if pool.is_master():
                                en = (alt_name
                                      if alt_name else self._event_name)
                                extra_event = self._fetcher.fetch(
                                    en,
                                    offline=self._offline,
                                    prefer_cache=self._prefer_cache)[0]
                                extra_data = self._fetcher.load_data(
                                    extra_event)

                                for rank in range(1, pool.size + 1):
                                    pool.comm.send(extra_data,
                                                   dest=rank,
                                                   tag=4)
                                pool.close()
                            else:
                                extra_data = pool.comm.recv(source=0, tag=4)
                                pool.wait()

                            if extra_data is not None:
                                extra_data = extra_data[list(
                                    extra_data.keys())[0]]

                                for key in urk:
                                    new_val = extra_data.get(key)
                                    self._event_data[list(
                                        self._event_data.keys())
                                                     [0]][key] = new_val
                                    if new_val is not None and len(new_val):
                                        prt.message('extra_value', [
                                            key,
                                            str(new_val[0].get(QUANTITY.VALUE))
                                        ])
                                success = False
                                prt.message('reloading_merged')
                                break
                            else:
                                text = prt.text('extra_not_found',
                                                [self._event_name])
                                alt_name = prt.prompt(text, kind='string')
                                if not alt_name:
                                    break

                    if success:
                        self._walker_data = walker_data

                        entry, p, lnprob = self.fit_data(
                            event_name=self._event_name,
                            method=method,
                            iterations=iterations,
                            num_walkers=num_walkers,
                            num_temps=num_temps,
                            burn=burn,
                            post_burn=post_burn,
                            fracking=fracking,
                            frack_step=frack_step,
                            gibbs=gibbs,
                            pool=pool,
                            output_path=output_path,
                            suffix=suffix,
                            write=write,
                            upload=upload,
                            upload_token=upload_token,
                            check_upload_quality=check_upload_quality,
                            convergence_type=convergence_type,
                            convergence_criteria=convergence_criteria,
                            save_full_chain=save_full_chain,
                            extra_outputs=extra_outputs)
                        if return_fits:
                            entries[ei][mi] = deepcopy(entry)
                            ps[ei][mi] = deepcopy(p)
                            lnprobs[ei][mi] = deepcopy(lnprob)

                    if pool.is_master():
                        pool.close()

                    # Remove global model variable and garbage collect.
                    try:
                        model
                    except NameError:
                        pass
                    else:
                        del (model)
                    del (self._model)
                    gc.collect()

        return (entries, ps, lnprobs)

    def fit_data(self,
                 event_name='',
                 method=None,
                 iterations=None,
                 frack_step=20,
                 num_walkers=None,
                 num_temps=1,
                 burn=None,
                 post_burn=None,
                 fracking=True,
                 gibbs=False,
                 pool=None,
                 output_path='',
                 suffix='',
                 write=False,
                 upload=False,
                 upload_token='',
                 check_upload_quality=True,
                 convergence_type=None,
                 convergence_criteria=None,
                 save_full_chain=False,
                 extra_outputs=None):
        """Fit the data for a given event.

        Fitting performed using a combination of emcee and fracking.
        """
        if self._speak:
            speak('Fitting ' + event_name, self._speak)
        from mosfit.__init__ import __version__
        global model
        model = self._model
        prt = self._printer

        upload_model = upload and iterations > 0

        if pool is not None:
            self._pool = pool

        if upload:
            try:
                import dropbox
            except ImportError:
                if self._test:
                    pass
                else:
                    prt.message('install_db', error=True)
                    raise

        if not self._pool.is_master():
            try:
                self._pool.wait()
            except (KeyboardInterrupt, SystemExit):
                pass
            return (None, None, None)

        self._method = method

        if self._method == 'nester':
            self._sampler = Nester(self, model, iterations, burn, post_burn,
                                   num_walkers, convergence_criteria,
                                   convergence_type, gibbs, fracking,
                                   frack_step)
        else:
            self._sampler = Ensembler(self, model, iterations, burn, post_burn,
                                      num_temps, num_walkers,
                                      convergence_criteria, convergence_type,
                                      gibbs, fracking, frack_step)

        self._sampler.run(self._walker_data)

        prt.message('constructing')

        if write:
            if self._speak:
                speak(prt._strings['saving_output'], self._speak)

        if self._event_path:
            entry = Entry.init_from_file(catalog=None,
                                         name=self._event_name,
                                         path=self._event_path,
                                         merge=False,
                                         pop_schema=False,
                                         ignore_keys=[ENTRY.MODELS],
                                         compare_to_existing=False)
            new_photometry = []
            for photo in entry.get(ENTRY.PHOTOMETRY, []):
                if PHOTOMETRY.REALIZATION not in photo:
                    new_photometry.append(photo)
            if len(new_photometry):
                entry[ENTRY.PHOTOMETRY] = new_photometry
        else:
            entry = Entry(name=self._event_name)

        uentry = Entry(name=self._event_name)
        data_keys = set()
        for task in model._call_stack:
            if model._call_stack[task]['kind'] == 'data':
                data_keys.update(
                    list(model._call_stack[task].get('keys', {}).keys()))
        entryhash = entry.get_hash(keys=list(sorted(list(data_keys))))

        # Accumulate all the sources and add them to each entry.
        sources = []
        for root in model._references:
            for ref in model._references[root]:
                sources.append(entry.add_source(**ref))
        sources.append(entry.add_source(**self._DEFAULT_SOURCE))
        source = ','.join(sources)

        usources = []
        for root in model._references:
            for ref in model._references[root]:
                usources.append(uentry.add_source(**ref))
        usources.append(uentry.add_source(**self._DEFAULT_SOURCE))
        usource = ','.join(usources)

        model_setup = OrderedDict()
        for ti, task in enumerate(model._call_stack):
            task_copy = deepcopy(model._call_stack[task])
            if (task_copy['kind'] == 'parameter'
                    and task in model._parameter_json):
                task_copy.update(model._parameter_json[task])
            model_setup[task] = task_copy
        modeldict = OrderedDict([(MODEL.NAME, model._model_name),
                                 (MODEL.SETUP, model_setup),
                                 (MODEL.CODE, 'MOSFiT'),
                                 (MODEL.DATE, time.strftime("%Y/%m/%d")),
                                 (MODEL.VERSION, __version__),
                                 (MODEL.SOURCE, source)])

        self._sampler.prepare_output(check_upload_quality, upload)

        self._sampler.append_output(modeldict)

        umodeldict = deepcopy(modeldict)
        umodeldict[MODEL.SOURCE] = usource
        modelhash = get_model_hash(umodeldict,
                                   ignore_keys=[MODEL.DATE, MODEL.SOURCE])
        umodelnum = uentry.add_model(**umodeldict)

        if self._sampler._upload_model is not None:
            upload_model = self._sampler._upload_model

        modelnum = entry.add_model(**modeldict)

        samples, probs, weights = self._sampler.get_samples()

        extras = OrderedDict()
        samples_to_plot = self._sampler._nwalkers

        if isinstance(self._sampler, Nester):
            icdf = np.cumsum(np.concatenate(([0.0], weights)))
            draws = np.random.rand(samples_to_plot)
            indices = np.searchsorted(icdf, draws) - 1
        else:
            indices = list(range(samples_to_plot))

        ri = 0
        selected_extra = False
        for xi, x in enumerate(samples):
            ri = ri + 1
            prt.message('outputting_walker', [ri, len(samples)],
                        inline=True,
                        min_time=0.2)
            if xi in indices:
                output = model.run_stack(x, root='output')
                if extra_outputs is not None:
                    if not extra_outputs and not selected_extra:
                        extra_options = list(output.keys())
                        prt.message('available_keys')
                        for opt in extra_options:
                            prt.prt('- {}'.format(opt))
                        selected_extra = True
                    for key in extra_outputs:
                        new_val = output.get(key, [])
                        new_val = all_to_list(new_val)
                        extras.setdefault(key, []).append(new_val)
                for i in range(len(output['times'])):
                    if not np.isfinite(output['model_observations'][i]):
                        continue
                    photodict = {
                        PHOTOMETRY.TIME:
                        output['times'][i] + output['min_times'],
                        PHOTOMETRY.MODEL: modelnum,
                        PHOTOMETRY.SOURCE: source,
                        PHOTOMETRY.REALIZATION: str(ri)
                    }
                    if output['observation_types'][i] == 'magnitude':
                        photodict[PHOTOMETRY.BAND] = output['bands'][i]
                        photodict[PHOTOMETRY.
                                  MAGNITUDE] = output['model_observations'][i]
                        photodict[PHOTOMETRY.
                                  E_MAGNITUDE] = output['model_variances'][i]
                    elif output['observation_types'][i] == 'magcount':
                        if output['model_observations'][i] == 0.0:
                            continue
                        photodict[PHOTOMETRY.BAND] = output['bands'][i]
                        photodict[PHOTOMETRY.
                                  COUNT_RATE] = output['model_observations'][i]
                        photodict[PHOTOMETRY.
                                  E_COUNT_RATE] = output['model_variances'][i]
                        photodict[PHOTOMETRY.MAGNITUDE] = -2.5 * np.log10(
                            output['model_observations']
                            [i]) + output['all_zeropoints'][i]
                        photodict[PHOTOMETRY.E_UPPER_MAGNITUDE] = 2.5 * (
                            np.log10(output['model_observations'][i] +
                                     output['model_variances'][i]) -
                            np.log10(output['model_observations'][i]))
                        if (output['model_variances'][i] >
                                output['model_observations'][i]):
                            photodict[PHOTOMETRY.UPPER_LIMIT] = True
                        else:
                            photodict[PHOTOMETRY.E_LOWER_MAGNITUDE] = 2.5 * (
                                np.log10(output['model_observations'][i]) -
                                np.log10(output['model_observations'][i] -
                                         output['model_variances'][i]))
                    elif output['observation_types'][i] == 'fluxdensity':
                        photodict[PHOTOMETRY.FREQUENCY] = output[
                            'frequencies'][i] * frequency_unit('GHz')
                        photodict[PHOTOMETRY.FLUX_DENSITY] = output[
                            'model_observations'][i] * flux_density_unit('µJy')
                        photodict[PHOTOMETRY.E_LOWER_FLUX_DENSITY] = (
                            photodict[PHOTOMETRY.FLUX_DENSITY] -
                            (10.0**
                             (np.log10(photodict[PHOTOMETRY.FLUX_DENSITY]) -
                              output['model_variances'][i] / 2.5)) *
                            flux_density_unit('µJy'))
                        photodict[PHOTOMETRY.E_UPPER_FLUX_DENSITY] = (
                            10.0**(np.log10(photodict[PHOTOMETRY.FLUX_DENSITY])
                                   + output['model_variances'][i] / 2.5) *
                            flux_density_unit('µJy') -
                            photodict[PHOTOMETRY.FLUX_DENSITY])
                        photodict[PHOTOMETRY.U_FREQUENCY] = 'GHz'
                        photodict[PHOTOMETRY.U_FLUX_DENSITY] = 'µJy'
                    elif output['observation_types'][i] == 'countrate':
                        photodict[PHOTOMETRY.
                                  COUNT_RATE] = output['model_observations'][i]
                        photodict[PHOTOMETRY.E_LOWER_COUNT_RATE] = (
                            photodict[PHOTOMETRY.COUNT_RATE] -
                            (10.0**(np.log10(photodict[PHOTOMETRY.COUNT_RATE])
                                    - output['model_variances'][i] / 2.5)))
                        photodict[PHOTOMETRY.E_UPPER_COUNT_RATE] = (
                            10.0**(np.log10(photodict[PHOTOMETRY.COUNT_RATE]) +
                                   output['model_variances'][i] / 2.5) -
                            photodict[PHOTOMETRY.COUNT_RATE])
                        photodict[PHOTOMETRY.U_COUNT_RATE] = 's^-1'
                    if ('model_upper_limits' in output
                            and output['model_upper_limits'][i]):
                        photodict[PHOTOMETRY.UPPER_LIMIT] = bool(
                            output['model_upper_limits'][i])
                    if self._limiting_magnitude is not None:
                        photodict[PHOTOMETRY.SIMULATED] = True
                    if 'telescopes' in output and output['telescopes'][i]:
                        photodict[
                            PHOTOMETRY.TELESCOPE] = output['telescopes'][i]
                    if 'systems' in output and output['systems'][i]:
                        photodict[PHOTOMETRY.SYSTEM] = output['systems'][i]
                    if 'bandsets' in output and output['bandsets'][i]:
                        photodict[PHOTOMETRY.BAND_SET] = output['bandsets'][i]
                    if 'instruments' in output and output['instruments'][i]:
                        photodict[
                            PHOTOMETRY.INSTRUMENT] = output['instruments'][i]
                    if 'modes' in output and output['modes'][i]:
                        photodict[PHOTOMETRY.MODE] = output['modes'][i]
                    entry.add_photometry(compare_to_existing=False,
                                         check_for_dupes=False,
                                         **photodict)

                    uphotodict = deepcopy(photodict)
                    uphotodict[PHOTOMETRY.SOURCE] = umodelnum
                    uentry.add_photometry(compare_to_existing=False,
                                          check_for_dupes=False,
                                          **uphotodict)
            else:
                output = model.run_stack(x, root='objective')

            parameters = OrderedDict()
            derived_keys = set()
            pi = 0
            for ti, task in enumerate(model._call_stack):
                # if task not in model._free_parameters:
                #     continue
                if model._call_stack[task]['kind'] != 'parameter':
                    continue
                paramdict = OrderedDict(
                    (('latex', model._modules[task].latex()),
                     ('log', model._modules[task].is_log())))
                if task in model._free_parameters:
                    poutput = model._modules[task].process(
                        **{'fraction': x[pi]})
                    value = list(poutput.values())[0]
                    paramdict['value'] = value
                    paramdict['fraction'] = x[pi]
                    pi = pi + 1
                else:
                    if output.get(task, None) is not None:
                        paramdict['value'] = output[task]
                parameters.update({model._modules[task].name(): paramdict})
                # Dump out any derived parameter keys
                derived_keys.update(model._modules[task].get_derived_keys())

            for key in list(sorted(list(derived_keys))):
                if (output.get(key, None) is not None
                        and key not in parameters):
                    parameters.update({key: {'value': output[key]}})

            realdict = {REALIZATION.PARAMETERS: parameters}
            if probs is not None:
                realdict[REALIZATION.SCORE] = str(probs[xi])
            else:
                realdict[REALIZATION.SCORE] = str(
                    ln_likelihood(x) + ln_prior(x))
            realdict[REALIZATION.ALIAS] = str(ri)
            realdict[REALIZATION.WEIGHT] = str(weights[xi])
            entry[ENTRY.MODELS][0].add_realization(check_for_dupes=False,
                                                   **realdict)
            urealdict = deepcopy(realdict)
            uentry[ENTRY.MODELS][0].add_realization(check_for_dupes=False,
                                                    **urealdict)
        prt.message('all_walkers_written', inline=True)

        entry.sanitize()
        oentry = {self._event_name: entry._ordered(entry)}
        uentry.sanitize()
        ouentry = {self._event_name: uentry._ordered(uentry)}

        uname = '_'.join([self._event_name, entryhash, modelhash])

        if output_path and not os.path.exists(output_path):
            os.makedirs(output_path)

        if not os.path.exists(model.get_products_path()):
            os.makedirs(model.get_products_path())

        if write:
            prt.message('writing_complete')
            with open_atomic(
                    os.path.join(model.get_products_path(), 'walkers.json'),
                    'w') as flast, open_atomic(
                        os.path.join(
                            model.get_products_path(), self._event_name +
                            (('_' + suffix) if suffix else '') + '.json'),
                        'w') as feven:
                entabbed_json_dump(oentry, flast, separators=(',', ':'))
                entabbed_json_dump(oentry, feven, separators=(',', ':'))

            if save_full_chain:
                prt.message('writing_full_chain')
                with open_atomic(
                        os.path.join(model.get_products_path(), 'chain.json'),
                        'w') as flast, open_atomic(
                            os.path.join(
                                model.get_products_path(),
                                self._event_name + '_chain' +
                                (('_' + suffix) if suffix else '') + '.json'),
                            'w') as feven:
                    entabbed_json_dump(self._sampler._all_chain.tolist(),
                                       flast,
                                       separators=(',', ':'))
                    entabbed_json_dump(self._sampler._all_chain.tolist(),
                                       feven,
                                       separators=(',', ':'))

            if extra_outputs is not None:
                prt.message('writing_extras')
                with open_atomic(
                        os.path.join(model.get_products_path(), 'extras.json'),
                        'w') as flast, open_atomic(
                            os.path.join(
                                model.get_products_path(),
                                self._event_name + '_extras' +
                                (('_' + suffix) if suffix else '') + '.json'),
                            'w') as feven:
                    entabbed_json_dump(extras, flast, separators=(',', ':'))
                    entabbed_json_dump(extras, feven, separators=(',', ':'))

            prt.message('writing_model')
            with open_atomic(
                    os.path.join(model.get_products_path(), 'upload.json'),
                    'w') as flast, open_atomic(
                        os.path.join(
                            model.get_products_path(), uname +
                            (('_' + suffix) if suffix else '') + '.json'),
                        'w') as feven:
                entabbed_json_dump(ouentry, flast, separators=(',', ':'))
                entabbed_json_dump(ouentry, feven, separators=(',', ':'))

        if upload_model:
            prt.message('ul_fit', [entryhash, self._sampler._modelhash])
            upayload = entabbed_json_dumps(ouentry, separators=(',', ':'))
            try:
                dbx = dropbox.Dropbox(upload_token)
                dbx.files_upload(upayload.encode(),
                                 '/' + uname + '.json',
                                 mode=dropbox.files.WriteMode.overwrite)
                prt.message('ul_complete')
            except Exception:
                if self._test:
                    pass
                else:
                    raise

        if upload:
            for ce in self._converter.get_converted():
                dentry = Entry.init_from_file(catalog=None,
                                              name=ce[0],
                                              path=ce[1],
                                              merge=False,
                                              pop_schema=False,
                                              ignore_keys=[ENTRY.MODELS],
                                              compare_to_existing=False)

                dentry.sanitize()
                odentry = {ce[0]: uentry._ordered(dentry)}
                dpayload = entabbed_json_dumps(odentry, separators=(',', ':'))
                text = prt.message('ul_devent', [ce[0]], prt=False)
                ul_devent = prt.prompt(text, kind='bool', message=False)
                if ul_devent:
                    dpath = '/' + slugify(
                        ce[0] + '_' + dentry[ENTRY.SOURCES][0].get(
                            SOURCE.BIBCODE, dentry[ENTRY.SOURCES][0].get(
                                SOURCE.NAME, 'NOSOURCE'))) + '.json'
                    try:
                        dbx = dropbox.Dropbox(upload_token)
                        dbx.files_upload(
                            dpayload.encode(),
                            dpath,
                            mode=dropbox.files.WriteMode.overwrite)
                        prt.message('ul_complete')
                    except Exception:
                        if self._test:
                            pass
                        else:
                            raise

        return (entry, samples, probs)

    def nester(self):
        """Use nested sampling to determine posteriors."""
        pass

    def generate_dummy_data(self,
                            name,
                            max_time=1000.,
                            time_list=[],
                            band_list=[],
                            band_systems=[],
                            band_instruments=[],
                            band_bandsets=[]):
        """Generate simulated data based on priors."""
        # Just need 2 plot points for beginning and end.
        plot_points = 2

        times = list(
            sorted(
                set(list(np.linspace(0.0, max_time, plot_points)) +
                    time_list)))
        band_list_all = ['V'] if len(band_list) == 0 else band_list
        times = np.repeat(times, len(band_list_all))

        # Create lists of systems/instruments if not provided.
        if isinstance(band_systems, string_types):
            band_systems = [band_systems for x in range(len(band_list_all))]
        if isinstance(band_instruments, string_types):
            band_instruments = [
                band_instruments for x in range(len(band_list_all))
            ]
        if isinstance(band_bandsets, string_types):
            band_bandsets = [band_bandsets for x in range(len(band_list_all))]
        if len(band_systems) < len(band_list_all):
            rep_val = '' if len(band_systems) == 0 else band_systems[-1]
            band_systems = band_systems + [
                rep_val for x in range(len(band_list_all) - len(band_systems))
            ]
        if len(band_instruments) < len(band_list_all):
            rep_val = '' if len(
                band_instruments) == 0 else band_instruments[-1]
            band_instruments = band_instruments + [
                rep_val
                for x in range(len(band_list_all) - len(band_instruments))
            ]
        if len(band_bandsets) < len(band_list_all):
            rep_val = '' if len(band_bandsets) == 0 else band_bandsets[-1]
            band_bandsets = band_bandsets + [
                rep_val
                for x in range(len(band_list_all) - len(band_bandsets))
            ]

        bands = [i for s in [band_list_all for x in times] for i in s]
        systs = [i for s in [band_systems for x in times] for i in s]
        insts = [i for s in [band_instruments for x in times] for i in s]
        bsets = [i for s in [band_bandsets for x in times] for i in s]

        data = {name: {'photometry': []}}
        for ti, tim in enumerate(times):
            band = bands[ti]
            if isinstance(band, dict):
                band = band['name']

            photodict = {
                'time': tim,
                'band': band,
                'magnitude': 0.0,
                'e_magnitude': 0.0
            }
            if systs[ti]:
                photodict['system'] = systs[ti]
            if insts[ti]:
                photodict['instrument'] = insts[ti]
            if bsets[ti]:
                photodict['bandset'] = bsets[ti]
            data[name]['photometry'].append(photodict)

        return data