def new_figure(self):
printlog('New figure...')
fig = plt.figure(figsize=(12, 8))
fig.suptitle(self.modelDescription + ' (' + self.country + ')')
if (self.silentPlot): plt.ion()
return fig
def optimize(self, populationSize, maxiter=1000):
self.nSamples = 1
self.e = korali.Experiment()
self.e['Problem']['Type'] = 'Bayesian/Reference'
self.e['Problem']['Likelihood Model'] = self.likelihoodModel
self.e['Problem']['Reference Data'] = list(
map(float, self.data['Model']['y-data']))
self.e['Problem']['Computational Model'] = self.computational_model
self.e["Solver"]["Type"] = "Optimizer/CMAES"
self.e["Solver"]["Population Size"] = populationSize
self.e["Solver"]["Termination Criteria"]["Max Generations"] = maxiter
self.e["Solver"]["Termination Criteria"][
"Min Value Difference Threshold"] = 1e-9
js = self.get_variables_and_distributions()
self.set_variables_and_distributions(js)
self.set_korali_output_files(self.saveInfo['korali samples'], maxiter)
self.e['Console Output']['Verbosity'] = 'Detailed'
if self.silent:
self.e['Console Output']['Verbosity'] = 'Silent'
k = korali.Engine()
k['Conduit']['Type'] = 'Concurrent'
k['Conduit']['Concurrent Jobs'] = self.nThreads
k.run(self.e)
printlog('Copy variables from Korali to Epidemics...')
self.parameters = []
myDatabase = self.e['Results']['Best Sample']['Parameters']
for j in range(self.nParameters):
self.parameters.append({})
self.parameters[j]['Name'] = self.e['Variables'][j]['Name']
self.parameters[j]['Values'] = np.asarray([myDatabase[j]])
self.has_been_called['optimize'] = True
self.has_been_called['propagate'] = False
printlog('Done copying variables.')
names = []
best = []
for j in range(self.nParameters):
best.append(myDatabase[j])
names.append(self.parameters[j]['Name'])
js = {}
js["Value"] = self.e['Results']['Best Sample']['F(x)']
js["Parameter"] = best
js["Names"] = names
save_file(js, self.saveInfo['cmaes'], 'Optimum', fileType='json')
def load_parameters(self, samples_path):
printlog('Loading posterior samples from {}'.format(samples_path))
files = list(
set([
filename for filename in os.listdir(samples_path)
if (filename.endswith(".json"))
]))
files.sort()
filename = files[-1]
variable_names = []
with open(samples_path + '/latest') as json_file:
data = json.load(json_file)
print(data.keys())
if 'Sample Database' in data['Results']:
samples = data['Results']['Sample Database']
elif 'Posterior Sample Database' in data['Results']:
samples = data['Results']['Posterior Sample Database']
else:
print('Not avail')
variables = data['Variables']
self.nParameters = len(variables)
self.nSamples = len(samples)
self.parameters = []
for j in range(self.nParameters):
self.parameters.append({})
self.parameters[j]['Name'] = variables[j]['Name']
self.parameters[j]['Values'] = np.asarray(
[samples[k][j] for k in range(self.nSamples)])
self.has_been_called['sample'] = True
printlog('Loaded')
def sample(self, nSamples=1000, cov=0.4, maxiter=100):
self.e = korali.Experiment()
self.nSamples = nSamples
self.e['Problem']['Type'] = 'Bayesian/Reference'
self.e['Problem']['Likelihood Model'] = self.likelihoodModel
self.e['Problem']['Reference Data'] = list(
map(float, self.data['Model']['y-data']))
self.e['Problem']['Computational Model'] = self.computational_model
self.e['Solver']['Type'] = "Sampler/TMCMC"
self.e['Solver']['Version'] = self.sampler
self.e['Solver']['Step Size'] = 0.1
self.e['Solver']['Population Size'] = self.nSamples
self.e['Solver']['Target Coefficient Of Variation'] = cov
self.e['Solver']['Termination Criteria']['Max Generations'] = maxiter
js = self.get_variables_and_distributions()
self.set_variables_and_distributions(js)
self.set_korali_output_files(self.saveInfo['korali samples'], maxiter)
self.e['Console Output']['Verbosity'] = 'Detailed'
if (self.silent): self.e['Console Output']['Verbosity'] = 'Silent'
k = korali.Engine()
k['Conduit']['Type'] = 'Concurrent'
k['Conduit']['Concurrent Jobs'] = self.nThreads
k.run(self.e)
js = {}
js['Log Evidence'] = self.e['Solver']['LogEvidence']
printlog(f"Log Evidence = {js['Log Evidence']}")
save_file(js,
self.saveInfo['evidence'],
'Log Evidence',
fileType='json')
printlog('Copy variables from Korali to Epidemics...')
self.parameters = []
myDatabase = self.e['Results']['Sample Database']
for j in range(self.nParameters):
self.parameters.append({})
self.parameters[j]['Name'] = self.e['Variables'][j]['Name']
self.parameters[j]['Values'] = np.asarray(
[myDatabase[k][j] for k in range(self.nSamples)])
self.has_been_called['sample'] = True
self.has_been_called['propagate'] = False
printlog('Done copying variables.')
for k, m in mean_params.items()
}
js['intervals_params'].update({
k: [
(
p, #
np.quantile(samples[k], 0.5 - p / 2), #
np.quantile(samples[k], 0.5 + p / 2), #
) for p in percentages
]
for k in samples.dtype.names
})
for k, v in vv.items():
t, mean, median, intervals = v
js['x-axis'] = list(t)
r = dict()
r['Intervals'] = [{
"Percentage": float(q[0]),
"Low Interval": list(q[1]),
"High Interval": list(q[2]),
} for q in intervals]
r['Mean'] = list(mean)
r['Median'] = list(median)
js[k] = r
fn = os.path.join(dataFolder, 'intervals.json')
printlog(f'Save intervals in: {fn}')
with open(fn, 'w') as f:
json.dump(js, f, indent=2, sort_keys=True)
def compute_plot_intervals(self, varName, ns, ax, ylabel, cumulate=-1):
Np = self.propagatedVariables[varName].shape[0]
Nt = self.propagatedVariables[varName].shape[1]
samples = np.zeros((Np * ns, Nt))
start = time.process_time()
printlog(
f"Sampling from {self.likelihoodModel} for '{varName}' variable... ",
end='',
flush=True)
if self.likelihoodModel == 'Normal':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
r = self.propagatedVariables['Standard Deviation {0}'.format(
varName)][:, k]
x = [np.random.normal(m, r) for _ in range(ns)]
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'Positive Normal':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
s = self.propagatedVariables['Standard Deviation {0}'.format(
varName)][:, k]
t = get_truncated_normal(m, s, 0, np.Inf)
x = [t.rvs() for _ in range(ns)]
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'StudentT':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
dof = self.propagatedVariables['Degrees Of Freedom {0}'.format(
varName)][:, k]
x = [m + np.random.standard_t(dof) for _ in range(ns)]
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'Positive StudentT':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
dof = self.propagatedVariables['Degrees Of Freedom {0}'.format(
varName)][:, k]
x = [positive_standard_t(m, dof) for _ in range(ns)]
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'Poisson':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
try:
x = [np.random.poisson(m) for _ in range(ns)]
except:
printlog("Error p: {}".format(p))
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'Geometric':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
p = 1.0 / (1.0 + m)
try:
x = [np.random.geometric(p) - 1 for _ in range(ns)]
except:
printlog("Error p: {}".format(p))
samples[:, k] = np.asarray(x).flatten()
elif self.likelihoodModel == 'Negative Binomial':
for k in range(Nt):
m = self.propagatedVariables[varName][:, k]
r = self.propagatedVariables['Dispersion {0}'.format(
varName)][:, k]
p = m / (m + r)
try:
x = [
np.random.negative_binomial(r, 1 - p)
for _ in range(ns)
]
except:
printlog("Error p: {}".format(p))
samples[:, k] = np.asarray(x).flatten()
else:
abort("Likelihood not found in compute_plot_intervals.")
if cumulate > 0:
samples = np.cumsum(samples, axis=cumulate)
elapsed = time.process_time() - start
printlog(f" elapsed {elapsed:.2f} sec")
printlog(f"Computing quantiles... ")
mean = np.zeros((Nt, 1))
median = np.zeros((Nt, 1))
for k in range(Nt):
median[k] = np.quantile(samples[:, k], 0.5)
mean[k] = np.mean(samples[:, k])
for p in np.sort(self.percentages)[::-1]:
q1 = np.zeros((Nt, ))
q2 = np.zeros((Nt, ))
for k in range(Nt):
q1[k] = np.quantile(samples[:, k], 0.5 - p / 2)
q2[k] = np.quantile(samples[:, k], 0.5 + p / 2)
ax.fill_between(self.data['Propagation']['x-data'],
q1,
q2,
alpha=0.5,
label=f' {100*p:.1f}% credible interval')
ax.plot(self.data['Propagation']['x-data'],
mean,
'-',
lw=2,
label='Mean',
color='black')
ax.plot(self.data['Propagation']['x-data'],
median,
'--',
lw=2,
label='Median',
color='black')
ax.legend(loc='upper left')
ax.set_ylabel(ylabel)
x = range(
np.ceil(max(self.data['Propagation']['x-data']) + 1).astype(int))
ax.set_xticks(x[0:-1:14])
ax.grid()
ax.set_xlim(left=x[1])
if (self.logPlot and cumulate < 1):
ax.set_yscale('log')
ax.set_ylim(bottom=1e-1)
plt.draw()
plt.pause(0.001)
def propagate(self, nPropagate=1000):
if not self.has_been_called['sample'] and not self.has_been_called[
'optimize']:
abort('[Error] Sample or Optimize before propagation')
return
self.e = korali.Experiment()
self.nPropagate = nPropagate
self.e['Problem']['Type'] = 'Propagation'
self.e['Problem'][
'Execution Model'] = self.computational_model_propagate
for k in range(self.nParameters):
self.e['Variables'][k]['Name'] = self.parameters[k]['Name']
self.e['Variables'][k]['Precomputed Values'] = self.parameters[k][
'Values'].tolist()
self.e['Solver']['Type'] = 'Executor'
self.set_korali_output_files(self.saveInfo['korali propagation'])
if (self.silent): self.e['Console Output']['Verbosity'] = 'Silent'
self.e['Store Sample Information'] = True
k = korali.Engine()
k.run(self.e)
propagate_idx = random.sample(range(self.nSamples), nPropagate)
Nv = self.e['Samples'][0]['Saved Results']['Number of Variables']
Nt = self.e['Samples'][0]['Saved Results']['Length of Variables']
varNames = []
for k in range(Nv):
varNames.append(
self.e['Samples'][0]['Saved Results']['Variables'][k]['Name'])
printlog('Copy variables from Korali to Epidemics...')
self.propagatedVariables = {}
for i, x in enumerate(varNames):
self.propagatedVariables[x] = np.zeros((nPropagate, Nt))
for k, idx in enumerate(propagate_idx):
self.propagatedVariables[x][k] = np.asarray(
self.e['Samples'][idx]['Saved Results']['Variables'][i]
['Values'])
varNames = []
if (self.likelihoodModel == 'Normal'
or self.likelihoodModel == 'Positive Normal'):
if self.useInfections:
varNames.append('Standard Deviation Daily Incidence')
if self.useDeaths:
varNames.append('Standard Deviation Daily Deaths')
elif (self.likelihoodModel == 'StudentT'
or self.likelihoodModel == 'Positive StudentT'):
if self.useInfections:
varNames.append('Degrees Of Freedom Daily Incidence')
if self.useDeaths:
varNames.append('Degrees Of Freedom Daily Deaths')
elif (self.likelihoodModel == 'Poisson'):
pass
elif (self.likelihoodModel == 'Geometric'):
pass
elif (self.likelihoodModel == 'Negative Binomial'):
if self.useInfections:
varNames.append('Dispersion Daily Incidence')
if self.useDeaths:
varNames.append('Dispersion Daily Deaths')
else:
abort('Likelihood not found in propagate.')
for varName in varNames:
self.propagatedVariables[varName] = np.zeros((nPropagate, Nt))
for k in range(nPropagate):
self.propagatedVariables[varName][k] = np.asarray(
self.e['Samples'][k]['Saved Results'][varName])
printlog('Done copying variables.')
# TODO clear variable?
self.e = korali.Experiment()
self.has_been_called['propagate'] = True
def sample_knested(self,
nLiveSamples=1500,
freq=1500,
maxiter=1e9,
dlogz=0.1,
batch=1):
self.e = korali.Experiment()
self.e['Problem']['Type'] = 'Bayesian/Reference'
self.e['Problem']['Likelihood Model'] = self.likelihoodModel
self.e['Problem']['Reference Data'] = list(
map(float, self.data['Model']['y-data']))
self.e['Problem']['Computational Model'] = self.computational_model
self.e["Solver"]["Type"] = "Sampler/Nested"
self.e["Solver"]["Resampling Method"] = "Multi Ellipse"
self.e["Solver"]["Number Live Points"] = nLiveSamples
self.e["Solver"]["Proposal Update Frequency"] = freq
self.e["Solver"]["Ellipsoidal Scaling"] = 1.10
self.e["Solver"]["Batch Size"] = batch
self.e["Solver"]["Termination Criteria"]["Max Generations"] = maxiter
self.e["Solver"]["Termination Criteria"][
"Min Log Evidence Delta"] = dlogz
self.e["Solver"]["Termination Criteria"][
"Max Effective Sample Size"] = 25000
js = self.get_variables_and_distributions()
self.set_variables_and_distributions(js)
self.set_korali_output_files(self.saveInfo['korali samples'], maxiter)
self.e['Console Output']['Verbosity'] = 'Detailed'
self.e["Console Output"]["Frequency"] = 100
if (self.silent): self.e['Console Output']['Verbosity'] = 'Silent'
k = korali.Engine()
k['Conduit']['Type'] = 'Concurrent'
k['Conduit']['Concurrent Jobs'] = self.nThreads
k.run(self.e)
js = {}
js['Log Evidence'] = self.e['Solver']['LogEvidence']
js['Error'] = self.e['Solver']['LogEvidence Var']
printlog(f"Log Evidence = {js['Log Evidence']}")
printlog(f"Variance = {js['Error']}")
save_file(js,
self.saveInfo['evidence'],
'Log Evidence',
fileType='json')
printlog('Copy variables from Korali to Epidemics...')
myDatabase = self.e['Results']['Posterior Sample Database']
self.nSamples, _ = np.shape(myDatabase)
self.parameters = []
for j in range(self.nParameters):
self.parameters.append({})
self.parameters[j]['Name'] = self.e['Variables'][j]['Name']
self.parameters[j]['Values'] = np.asarray(
[myDatabase[k][j] for k in range(self.nSamples)])
self.has_been_called['sample'] = True
self.has_been_called['propagate'] = False
printlog('Done copying variables.')
