Source code for openquake.calculators.classical_risk

# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2014-2018 GEM Foundation
#
# OpenQuake is free software: you can redistribute it and/or modify it
# 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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# OpenQuake is distributed in the hope that it will be useful,
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# GNU Affero General Public License for more details.
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import numpy
from openquake.baselib.general import groupby, AccumDict
from openquake.baselib.python3compat import encode
from openquake.hazardlib.stats import compute_stats
from openquake.risklib import scientific
from openquake.calculators import base


F32 = numpy.float32


[docs]def classical_risk(riskinputs, riskmodel, param, monitor): """ Compute and return the average losses for each asset. :param riskinputs: :class:`openquake.risklib.riskinput.RiskInput` objects :param riskmodel: a :class:`openquake.risklib.riskinput.CompositeRiskModel` instance :param param: dictionary of extra parameters :param monitor: :class:`openquake.baselib.performance.Monitor` instance """ result = dict(loss_curves=[], stat_curves=[]) for ri in riskinputs: all_outputs = list(riskmodel.gen_outputs(ri, monitor)) for outputs in all_outputs: r = outputs.rlzi outputs.average_losses = AccumDict(accum=[]) # l -> array for l, loss_curves in enumerate(outputs): # loss_curves has shape (C, N, 2) for i, asset in enumerate(outputs.assets): aid = asset.ordinal avg = scientific.average_loss(loss_curves[:, i].T) outputs.average_losses[l].append(avg) lcurve = (loss_curves[:, i, 0], loss_curves[:, i, 1], avg) result['loss_curves'].append((l, r, aid, lcurve)) # compute statistics R = ri.hazard_getter.num_rlzs w = param['weights'] statnames, stats = zip(*param['stats']) l_idxs = range(len(riskmodel.lti)) for assets, outs in groupby( all_outputs, lambda o: tuple(o.assets)).items(): weights = [w[out.rlzi]['default'] for out in outs] out = outs[0] for l in l_idxs: for i, asset in enumerate(assets): avgs = numpy.array([r.average_losses[l][i] for r in outs]) avg_stats = compute_stats(avgs, stats, weights) # is a pair loss_curves, insured_loss_curves # out[l][:, i, 0] are the i-th losses # out[l][:, i, 1] are the i-th poes losses = out[l][:, i, 0] poes_stats = compute_stats( numpy.array([out[l][:, i, 1] for out in outs]), stats, weights) result['stat_curves'].append( (l, asset.ordinal, losses, poes_stats, avg_stats)) if R == 1: # the realization is the same as the mean del result['loss_curves'] return result
[docs]@base.calculators.add('classical_risk') class ClassicalRiskCalculator(base.RiskCalculator): """ Classical Risk calculator """ core_task = classical_risk precalc = 'classical' accept_precalc = ['classical']
[docs] def pre_execute(self): """ Associate the assets to the sites and build the riskinputs. """ oq = self.oqparam if oq.insured_losses: raise ValueError( 'insured_losses are not supported for classical_risk') super().pre_execute() if 'poes' not in self.datastore: # when building short report return weights = [rlz.weight for rlz in self.rlzs_assoc.realizations] self.param = dict(stats=oq.hazard_stats(), weights=weights) self.riskinputs = self.build_riskinputs('poe') self.A = len(self.assetcol) self.L = len(self.riskmodel.loss_types) self.I = oq.insured_losses + 1 self.S = len(oq.hazard_stats())
[docs] def post_execute(self, result): """ Saving loss curves in the datastore. :param result: aggregated result of the task classical_risk """ curve_res = {cp.loss_type: cp.curve_resolution for cp in self.riskmodel.curve_params if cp.user_provided} self.loss_curve_dt = scientific.build_loss_curve_dt( curve_res, self.oqparam.insured_losses) ltypes = self.riskmodel.loss_types # loss curves stats are generated always stats = [encode(n) for (n, f) in self.oqparam.hazard_stats()] stat_curves = numpy.zeros((self.A, self.S), self.loss_curve_dt) avg_losses = numpy.zeros((self.A, self.S, self.L * self.I), F32) for l, a, losses, statpoes, statloss in result['stat_curves']: stat_curves_lt = stat_curves[ltypes[l]] for s in range(self.S): avg_losses[a, s, l] = statloss[s] base.set_array(stat_curves_lt['poes'][a, s], statpoes[s]) base.set_array(stat_curves_lt['losses'][a, s], losses) self.datastore['avg_losses-stats'] = avg_losses self.datastore.set_attrs('avg_losses-stats', stats=stats) self.datastore['loss_curves-stats'] = stat_curves self.datastore.set_attrs('loss_curves-stats', stats=stats) if self.R > 1: # individual realizations saved only if many loss_curves = numpy.zeros((self.A, self.R), self.loss_curve_dt) avg_losses = numpy.zeros((self.A, self.R, self.L * self.I), F32) for l, r, a, (losses, poes, avg) in result['loss_curves']: lc = loss_curves[a, r][ltypes[l]] avg_losses[a, r, l] = avg base.set_array(lc['losses'], losses) base.set_array(lc['poes'], poes) self.datastore['avg_losses-rlzs'] = avg_losses self.datastore['loss_curves-rlzs'] = loss_curves