Source code for openquake.calculators.disaggregation

# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# Copyright (C) 2015-2019 GEM Foundation
#
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# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
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# GNU Affero General Public License for more details.
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"""
Disaggregation calculator core functionality
"""
import logging
import operator
import numpy

from openquake.baselib import parallel, hdf5
from openquake.baselib.general import AccumDict, gen_slices, get_indices
from openquake.baselib.python3compat import encode
from openquake.hazardlib.calc import disagg
from openquake.hazardlib.imt import from_string
from openquake.hazardlib.calc.filters import SourceFilter
from openquake.hazardlib.gsim.base import ContextMaker
from openquake.hazardlib.contexts import RuptureContext
from openquake.hazardlib.tom import PoissonTOM
from openquake.calculators import getters
from openquake.calculators import base

weight = operator.attrgetter('weight')
DISAGG_RES_FMT = '%(imt)s-%(sid)s-%(poe)s/'
BIN_NAMES = 'mag', 'dist', 'lon', 'lat', 'eps', 'trt'
POE_TOO_BIG = '''\
Site #%d: you are trying to disaggregate for poe=%s.
However the source model produces at most probabilities
of %.7f for rlz=#%d, IMT=%s.
The disaggregation PoE is too big or your model is wrong,
producing too small PoEs.'''


def _check_curve(sid, rlz, curve, imtls, poes_disagg):
    # there may be sites where the sources are too small to produce
    # an effect at the given poes_disagg
    bad = 0
    for imt in imtls:
        max_poe = curve[imt].max()
        for poe in poes_disagg:
            if poe > max_poe:
                logging.warning(POE_TOO_BIG, sid, poe, max_poe, rlz, imt)
                bad += 1
    return bool(bad)


def _8d_matrix(matrices, num_trts):
    # convert a dict trti -> matrix into a single matrix of shape (T, ...)
    trti = next(iter(matrices))
    mat = numpy.zeros((num_trts,) + matrices[trti].shape)
    for trti in matrices:
        mat[trti] = matrices[trti]
    return mat


def _iml2s(rlzs, iml_disagg, imtls, poes_disagg, curves):
    # a list of N arrays of shape (M, P) with intensities
    M = len(imtls)
    P = len(poes_disagg)
    imts = [from_string(imt) for imt in imtls]
    lst = []
    for s, curve in enumerate(curves):
        iml2 = numpy.empty((M, P))
        iml2.fill(numpy.nan)
        if poes_disagg == (None,):
            for m, imt in enumerate(imtls):
                iml2[m, 0] = imtls[imt]
        elif curve:
            for m, imt in enumerate(imtls):
                poes = curve[imt][::-1]
                imls = imtls[imt][::-1]
                iml2[m] = numpy.interp(poes_disagg, poes, imls)
        aw = hdf5.ArrayWrapper(
            iml2, dict(poes_disagg=poes_disagg, imts=imts, rlzi=rlzs[s]))
        lst.append(aw)
    return lst


[docs]def compute_disagg(dstore, slc, cmaker, iml2s, trti, bin_edges, monitor): # see https://bugs.launchpad.net/oq-engine/+bug/1279247 for an explanation # of the algorithm used """ :param dstore: a :class:`openquake.baselib.datastore.DataStore` instance :param slc: a slice of ruptures :param cmaker: a :class:`openquake.hazardlib.gsim.base.ContextMaker` instance :param iml2s: a list of N arrays of shape (M, P) :param dict trti: tectonic region type index :param bin_egdes: a quintet (mag_edges, dist_edges, lon_edges, lat_edges, eps_edges) :param monitor: monitor of the currently running job :returns: a dictionary sid -> 7D-array """ dstore.open('r') oq = dstore['oqparam'] sitecol = dstore['sitecol'] rupdata = {k: dstore['rup/' + k][slc] for k in dstore['rup']} dstore.close() result = {'trti': trti} # all the time is spent in collect_bin_data RuptureContext.temporal_occurrence_model = PoissonTOM( oq.investigation_time) pne_mon = monitor('disaggregate_pne', measuremem=False) mat_mon = monitor('build_disagg_matrix', measuremem=False) gmf_mon = monitor('computing mean_std', measuremem=False) for sid, arr in disagg.build_matrices( rupdata, sitecol, cmaker, iml2s, oq.num_epsilon_bins, bin_edges, pne_mon, mat_mon, gmf_mon): result[sid] = arr return result # sid -> array
[docs]def agg_probs(*probs): """ Aggregate probabilities withe the usual formula 1 - (1 - P1) ... (1 - Pn) """ acc = 1. - probs[0] for prob in probs[1:]: acc *= 1. - prob return 1. - acc
[docs]@base.calculators.add('disaggregation') class DisaggregationCalculator(base.HazardCalculator): """ Classical PSHA disaggregation calculator """ precalc = 'classical' accept_precalc = ['classical', 'disaggregation']
[docs] def init(self): few = self.oqparam.max_sites_disagg if self.N > few: raise ValueError( 'The max number of sites for disaggregation set in ' 'openquake.cfg is %d, but you have %s' % (few, self.N)) super().init()
[docs] def execute(self): """Performs the disaggregation""" return self.full_disaggregation()
[docs] def get_curve(self, sid, rlz_by_sid): """ Get the hazard curve for the given site ID. """ imtls = self.oqparam.imtls ws = [rlz.weight for rlz in self.rlzs_assoc.realizations] pgetter = getters.PmapGetter(self.datastore, ws, numpy.array([sid])) rlz = rlz_by_sid[sid] try: pmap = pgetter.get(rlz) except ValueError: # empty pmaps logging.info( 'hazard curve contains all zero probabilities; ' 'skipping site %d, rlz=%d', sid, rlz.ordinal) return if sid not in pmap: return poes = pmap[sid].convert(imtls) for imt_str in imtls: if all(x == 0.0 for x in poes[imt_str]): logging.info( 'hazard curve contains all zero probabilities; ' 'skipping site %d, rlz=%d, IMT=%s', sid, rlz.ordinal, imt_str) return return poes
[docs] def check_poes_disagg(self, curves, rlzs): """ Raise an error if the given poes_disagg are too small compared to the hazard curves. """ oq = self.oqparam # there may be sites where the sources are too small to produce # an effect at the given poes_disagg ok_sites = [] for sid in self.sitecol.sids: if curves[sid] is None: ok_sites.append(sid) continue bad = _check_curve(sid, rlzs[sid], curves[sid], oq.imtls, oq.poes_disagg) if not bad: ok_sites.append(sid) if len(ok_sites) == 0: raise SystemExit('Cannot do any disaggregation') elif len(ok_sites) < self.N: logging.warning('Doing the disaggregation on' % self.sitecol) return ok_sites
[docs] def full_disaggregation(self): """ Run the disaggregation phase. """ oq = self.oqparam tl = oq.truncation_level src_filter = SourceFilter(self.sitecol, oq.maximum_distance) if hasattr(self, 'csm'): for sg in self.csm.src_groups: if sg.atomic: raise NotImplementedError( 'Atomic groups are not supported yet') if not self.csm.get_sources(): raise RuntimeError('All sources were filtered away!') csm_info = self.datastore['csm_info'] self.poes_disagg = oq.poes_disagg or (None,) self.imts = list(oq.imtls) if oq.rlz_index is None: try: rlzs = self.datastore['best_rlz'][()] except KeyError: rlzs = numpy.zeros(self.N, int) else: rlzs = [oq.rlz_index] * self.N if oq.iml_disagg: self.poe_id = {None: 0} curves = [None] * len(self.sitecol) # no hazard curves are needed self.ok_sites = set(self.sitecol.sids) else: self.poe_id = {poe: i for i, poe in enumerate(oq.poes_disagg)} curves = [self.get_curve(sid, rlzs) for sid in self.sitecol.sids] self.ok_sites = set(self.check_poes_disagg(curves, rlzs)) self.iml2s = _iml2s(rlzs, oq.iml_disagg, oq.imtls, self.poes_disagg, curves) if oq.disagg_by_src: self.build_disagg_by_src() eps_edges = numpy.linspace(-tl, tl, oq.num_epsilon_bins + 1) # build trt_edges trts = tuple(csm_info.trts) trt_num = {trt: i for i, trt in enumerate(trts)} self.trts = trts # build mag_edges min_mag = csm_info.min_mag max_mag = csm_info.max_mag mag_edges = oq.mag_bin_width * numpy.arange( int(numpy.floor(min_mag / oq.mag_bin_width)), int(numpy.ceil(max_mag / oq.mag_bin_width) + 1)) # build dist_edges maxdist = max(oq.maximum_distance(trt, max_mag) for trt in trts) dist_edges = oq.distance_bin_width * numpy.arange( 0, int(numpy.ceil(maxdist / oq.distance_bin_width) + 1)) # build eps_edges eps_edges = numpy.linspace(-tl, tl, oq.num_epsilon_bins + 1) # build lon_edges, lat_edges per sid bbs = src_filter.get_bounding_boxes(mag=max_mag) lon_edges, lat_edges = {}, {} # by sid for sid, bb in zip(self.sitecol.sids, bbs): lon_edges[sid], lat_edges[sid] = disagg.lon_lat_bins( bb, oq.coordinate_bin_width) self.bin_edges = mag_edges, dist_edges, lon_edges, lat_edges, eps_edges self.save_bin_edges() self.imldict = {} # sid, rlzi, poe, imt -> iml for s in self.sitecol.sids: iml2 = self.iml2s[s] r = rlzs[s] logging.info('Site #%d, disaggregating for rlz=#%d', s, r) for p, poe in enumerate(self.poes_disagg): for m, imt in enumerate(oq.imtls): self.imldict[s, r, poe, imt] = iml2[m, p] # submit disagg tasks gid = self.datastore['rup/grp_id'][()] indices_by_grp = get_indices(gid) # grp_id -> [(start, stop),...] blocksize = len(gid) // (oq.concurrent_tasks or 1) + 1 allargs = [] for grp_id, trt in csm_info.trt_by_grp.items(): trti = trt_num[trt] rlzs_by_gsim = self.rlzs_assoc.get_rlzs_by_gsim(grp_id) cmaker = ContextMaker( trt, rlzs_by_gsim, {'truncation_level': oq.truncation_level, 'maximum_distance': src_filter.integration_distance, 'filter_distance': oq.filter_distance, 'imtls': oq.imtls}) for start, stop in indices_by_grp[grp_id]: for slc in gen_slices(start, stop, blocksize): allargs.append((self.datastore, slc, cmaker, self.iml2s, trti, self.bin_edges)) self.datastore.close() results = parallel.Starmap( compute_disagg, allargs, hdf5path=self.datastore.filename ).reduce(self.agg_result, AccumDict(accum={})) return results # sid -> trti-> 7D array
[docs] def agg_result(self, acc, result): """ Collect the results coming from compute_disagg into self.results. :param acc: dictionary sid -> trti -> 7D array :param result: dictionary with the result coming from a task """ # this is fast trti = result.pop('trti') for sid, arr in result.items(): acc[sid][trti] = agg_probs(acc[sid].get(trti, 0), arr) return acc
[docs] def save_bin_edges(self): """ Save disagg-bins """ b = self.bin_edges for sid in self.sitecol.sids: bins = disagg.get_bins(b, sid) shape = [len(bin) - 1 for bin in bins] + [len(self.trts)] shape_dic = dict(zip(BIN_NAMES, shape)) if sid == 0: logging.info('nbins=%s for site=#%d', shape_dic, sid) matrix_size = numpy.prod(shape) if matrix_size > 1E7: raise ValueError( 'The disaggregation matrix for site #%d is too large ' '(%d elements): fix the binnning!' % (sid, matrix_size)) self.datastore['disagg-bins/mags'] = b[0] self.datastore['disagg-bins/dists'] = b[1] for sid in self.sitecol.sids: self.datastore['disagg-bins/lons/sid-%d' % sid] = b[2][sid] self.datastore['disagg-bins/lats/sid-%d' % sid] = b[3][sid] self.datastore['disagg-bins/eps'] = b[4]
[docs] def post_execute(self, results): """ Save all the results of the disaggregation. NB: the number of results to save is #sites * #rlzs * #disagg_poes * #IMTs. :param results: a dictionary sid -> trti -> disagg matrix """ self.datastore.open('r+') T = len(self.trts) # build a dictionary sid -> 8D matrix of shape (T, ..., M, P) results = {sid: _8d_matrix(dic, T) for sid, dic in results.items()} # get the number of outputs shp = (len(self.sitecol), len(self.poes_disagg), len(self.imts)) logging.info('Extracting and saving the PMFs for %d outputs ' '(N=%s, P=%d, M=%d)', numpy.prod(shp), *shp) self.save_disagg_result(results, trts=encode(self.trts))
[docs] def save_disagg_result(self, results, **attrs): """ Save the computed PMFs in the datastore :param results: an 8D-matrix of shape (T, .., M, P) """ for sid, matrix8 in results.items(): rlzi = self.iml2s[sid].rlzi for p, poe in enumerate(self.poes_disagg): for m, imt in enumerate(self.imts): self._save_result( 'disagg', sid, rlzi, poe, imt, matrix8[..., m, p, :]) self.datastore.set_attrs('disagg', **attrs)
def _save_result(self, dskey, site_id, rlz_id, poe, imt_str, matrix6): disagg_outputs = self.oqparam.disagg_outputs lon = self.sitecol.lons[site_id] lat = self.sitecol.lats[site_id] disp_name = dskey + '/' + DISAGG_RES_FMT % dict( imt=imt_str, sid='sid-%d' % site_id, poe='poe-%d' % self.poe_id[poe]) mag, dist, lonsd, latsd, eps = self.bin_edges lons, lats = lonsd[site_id], latsd[site_id] with self.monitor('extracting PMFs'): poe_agg = [] aggmatrix = agg_probs(*matrix6) for key, fn in disagg.pmf_map.items(): if not disagg_outputs or key in disagg_outputs: pmf = fn(matrix6 if key.endswith('TRT') else aggmatrix) self.datastore[disp_name + key] = pmf poe_agg.append(1. - numpy.prod(1. - pmf)) attrs = self.datastore.hdf5[disp_name].attrs attrs['site_id'] = site_id attrs['rlzi'] = rlz_id attrs['imt'] = imt_str attrs['iml'] = self.imldict[site_id, rlz_id, poe, imt_str] attrs['mag_bin_edges'] = mag attrs['dist_bin_edges'] = dist attrs['lon_bin_edges'] = lons attrs['lat_bin_edges'] = lats attrs['eps_bin_edges'] = eps attrs['trt_bin_edges'] = self.trts attrs['location'] = (lon, lat) # sanity check: all poe_agg should be the same attrs['poe_agg'] = poe_agg if poe and site_id in self.ok_sites: attrs['poe'] = poe poe_agg = numpy.mean(attrs['poe_agg']) if abs(1 - poe_agg / poe) > .1: logging.warning( 'Site #%d: poe_agg=%s is quite different from the expected' ' poe=%s; perhaps the number of intensity measure' ' levels is too small?', site_id, poe_agg, poe)
[docs] def build_disagg_by_src(self): """ :param dstore: a datastore :param iml2s: N arrays of IMLs with shape (M, P) """ logging.warning('Disaggregation by source is experimental') oq = self.oqparam ws = [rlz.weight for rlz in self.rlzs_assoc.realizations] pgetter = getters.PmapGetter(self.datastore, ws, self.sitecol.sids) groups = list(self.datastore['rlzs_by_grp']) M = len(oq.imtls) P = len(self.poes_disagg) for sid in self.sitecol.sids: poes = numpy.zeros((M, P, len(groups))) iml2 = self.iml2s[sid] for g, grp_id in enumerate(groups): pcurve = pgetter.get_pcurve(sid, iml2.rlzi, int(grp_id[4:])) if pcurve is None: continue for m, imt in enumerate(oq.imtls): xs = oq.imtls[imt] ys = pcurve.array[oq.imtls(imt), 0] poes[m, :, g] = numpy.interp(iml2[m], xs, ys) for m, imt in enumerate(oq.imtls): for p, poe in enumerate(self.poes_disagg): pref = ('iml-%s' % oq.iml_disagg[imt] if poe is None else 'poe-%s' % poe) name = 'disagg_by_src/%s-%s-sid-%s' % (pref, imt, sid) if poes[m, p].sum(): # nonzero contribution poe_agg = 1 - numpy.prod(1 - poes[m, p]) if poe and abs(1 - poe_agg / poe) > .1: logging.warning( 'poe_agg=%s is quite different from ' 'the expected poe=%s', poe_agg, poe) self.datastore[name] = poes[m, p] self.datastore.set_attrs(name, poe_agg=poe_agg)