def get_model(n_obs=50, true_params=None, seed_obs=None):
"""Return a complete Gaussian noise model.
Parameters
----------
n_obs : int, optional
the number of observations
true_params : list, optional
true_params[0] corresponds to the mean,
true_params[1] corresponds to the standard deviation
seed_obs : int, optional
seed for the observed data generation
Returns
-------
m : elfi.ElfiModel
"""
if true_params is None:
true_params = [10, 2]
y_obs = Gauss(*true_params,
n_obs=n_obs,
random_state=np.random.RandomState(seed_obs))
sim_fn = partial(Gauss, n_obs=n_obs)
m = elfi.ElfiModel()
elfi.Prior('uniform', -10, 50, model=m, name='mu')
elfi.Prior('truncnorm', 0.01, 5, model=m, name='sigma')
elfi.Simulator(sim_fn, m['mu'], m['sigma'], observed=y_obs, name='Gauss')
elfi.Summary(ss_mean, m['Gauss'], name='S1')
elfi.Summary(ss_var, m['Gauss'], name='S2')
elfi.Distance('euclidean', m['S1'], m['S2'], name='d')
return m
def get_model(self, n_obs=100, true_params=None, seed_obs=None):
"""Return a complete MA2 model in inference task.
Parameters
----------
n_obs : int, optional
observation length of the MA2 process
true_params : list, optional
parameters with which the observed data is generated
seed_obs : int, optional
seed for the observed data generation
Returns
-------
m : elfi.ElfiModel
"""
if true_params is None:
true_params = [60]
y_obs = self.func(*true_params,
random_state=np.random.RandomState(seed_obs))
m = elfi.ElfiModel()
elfi.Prior(ss.uniform, 0, 100, model=m, name='t1')
elfi.Simulator(self.func, m['t1'], observed=y_obs, name='sim')
elfi.Distance('euclidean', m['sim'], name='dist')
return m
def get_model(n_obs=100, true_params=None, seed_obs=None):
"""Returns a complete MA2 model in inference task
Parameters
----------
n_obs : int
observation length of the MA2 process
true_params : list
parameters with which the observed data is generated
seed_obs : None, int
seed for the observed data generation
Returns
-------
m : elfi.ElfiModel
"""
if true_params is None:
true_params = [.6, .2]
y = MA2(*true_params,
n_obs=n_obs,
random_state=np.random.RandomState(seed_obs))
sim_fn = partial(MA2, n_obs=n_obs)
m = elfi.ElfiModel(set_current=False)
elfi.Prior(CustomPrior1, 2, model=m, name='t1')
elfi.Prior(CustomPrior2, m['t1'], 1, name='t2')
elfi.Simulator(sim_fn, m['t1'], m['t2'], observed=y, name='MA2')
elfi.Summary(autocov, m['MA2'], name='S1')
elfi.Summary(autocov, m['MA2'], 2, name='S2')
elfi.Distance('euclidean', m['S1'], m['S2'], name='d')
return m
def get_model(self, n_obs=100, true_params=None, seed_obs=None):
"""Return a complete model in inference task.
Parameters
----------
n_obs : int, optional
observation length of the MA2 process
true_params : list, optional
parameters with which the observed data is generated
seed_obs : int, optional
seed for the observed data generation
Returns
-------
m : elfi.ElfiModel
"""
m = elfi.ElfiModel()
if true_params is None:
elfi.Prior('uniform', -20.0, 20.0, model=m, name='white')
elfi.Prior('uniform', -20.0, 20.0, model=m, name='yellow')
elfi.Prior('uniform', -20.0, 20.0, model=m, name='red')
elfi.Prior('uniform', -20.0, 20.0, model=m, name='green')
elfi.Prior('uniform', -20.0, 20.0, model=m, name='purple')
params = [
m['white'], m['yellow'], m['red'], m['green'], m['purple']
]
y_obs = self.get_observed_data()
elfi.Simulator(self.func, *params, observed=y_obs, name='sim')
elfi.Distance('euclidean', m['sim'], name='dist')
# elfi.Distance(self.discrepancyII, m['DGP'], name='d')
return m
def test_list_output():
vsim = elfi.tools.vectorize(lsimulator)
vsum = elfi.tools.vectorize(lsummary)
v = vsim(np.array([[.2, .8], [.3, .7]]))
assert is_array(v)
assert not isinstance(v[0], list)
vsim = elfi.tools.vectorize(lsimulator, dtype=False)
v = vsim(np.array([[.2, .8], [.3, .7]]))
assert is_array(v)
assert isinstance(v[0], list)
obs = lsimulator([.2, .8])
elfi.new_model()
p = elfi.Prior('dirichlet', [2, 2])
sim = elfi.Simulator(vsim, p, observed=obs)
S = elfi.Summary(vsum, sim)
d = elfi.Distance('euclidean', S)
pool = elfi.OutputPool(['sim'])
rej = elfi.Rejection(d, batch_size=100, pool=pool, output_names=['sim'])
sample = rej.sample(100, n_sim=1000)
mean = np.mean(sample.samples['p'], axis=0)
# Crude test
assert mean[1] > mean[0]
def test_single_parameter_linear_adjustment():
"""A regression test against values obtained in the notebook."""
seed = 20170616
n_obs = 50
batch_size = 100
mu, sigma = (5, 1)
# Hyperparameters
mu0, sigma0 = (10, 100)
y_obs = gauss.Gauss(
mu, sigma, n_obs=n_obs, batch_size=1, random_state=np.random.RandomState(seed))
sim_fn = partial(gauss.Gauss, sigma=sigma, n_obs=n_obs)
# Posterior
n = y_obs.shape[1]
mu1 = (mu0 / sigma0**2 + y_obs.sum() / sigma**2) / (1 / sigma0**2 + n / sigma**2)
sigma1 = (1 / sigma0**2 + n / sigma**2)**(-0.5)
# Model
m = elfi.ElfiModel()
elfi.Prior('norm', mu0, sigma0, model=m, name='mu')
elfi.Simulator(sim_fn, m['mu'], observed=y_obs, name='Gauss')
elfi.Summary(lambda x: x.mean(axis=1), m['Gauss'], name='S1')
elfi.Distance('euclidean', m['S1'], name='d')
res = elfi.Rejection(m['d'], output_names=['S1'], seed=seed).sample(1000, threshold=1)
adj = elfi.adjust_posterior(model=m, sample=res, parameter_names=['mu'], summary_names=['S1'])
assert np.allclose(_statistics(adj.outputs['mu']), (4.9772879640569778, 0.02058680115402544))
def get_model(n_obs=100, true_params=None, seed_obs=None, n_lags=5):
"""Return a complete ARCH(1) model.
Parameters
----------
n_obs: int
Observation length of the ARCH(1) process.
true_params: list, optinal
Parameters with which the observed data are generated.
seed_obs: int, optional
Seed for the observed data generation.
n_lags: int, optional
Number of lags in summary statistics.
Returns
-------
elfi.ElfiModel
"""
if true_params is None:
true_params = [0.3, 0.7]
logger.info(
f'true_params were not given. Now using [t1, t2] = {true_params}.')
# elfi model
m = elfi.ElfiModel()
# priors
t1 = elfi.Prior('uniform', -1, 2, model=m)
t2 = elfi.Prior('uniform', 0, 1, model=m)
priors = [t1, t2]
# observations
y_obs = arch(*true_params,
n_obs=n_obs,
random_state=np.random.RandomState(seed_obs))
# simulator
Y = elfi.Simulator(arch, *priors, observed=y_obs)
# summary statistics
ss = []
ss.append(elfi.Summary(sample_mean, Y, name='MU', model=m))
ss.append(elfi.Summary(sample_variance, Y, name='VAR', model=m))
for i in range(1, n_lags + 1):
ss.append(elfi.Summary(autocorr, Y, i, name=f'AC_{i}', model=m))
for i, j in combinations(range(1, n_lags + 1), 2):
ss.append(
elfi.Summary(pairwise_autocorr,
Y,
i,
j,
name=f'PW_{i}_{j}',
model=m))
# distance
elfi.Distance('euclidean', *ss, name='d', model=m)
return m
def get_model(alpha=0.2, delta=0, tau=0.198, N=20, seed_obs=None):
"""Returns the example model used in Lintusaari et al. 2016.
Here we infer alpha using the summary statistic T1. We expect the executable `bdm` be
available in the working directory.
Parameters
----------
alpha : float
birth rate
delta : float
death rate
tau : float
mutation rate
N : int
size of the population
seed_obs : None, int
Seed for the observed data generation. None gives the same data as in
Lintusaari et al. 2016
Returns
-------
m : elfi.ElfiModel
"""
if seed_obs is None and N == 20:
y = np.zeros(N, dtype='int16')
data = np.array([6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1], dtype='int16')
y[0:len(data)] = data
else:
y = BDM(alpha,
delta,
tau,
N,
random_state=np.random.RandomState(seed_obs))
m = elfi.ElfiModel(name='bdm')
elfi.Prior('uniform', .005, 2, model=m, name='alpha')
elfi.Simulator(BDM, m['alpha'], delta, tau, N, observed=y, name='BDM')
elfi.Summary(T1, m['BDM'], name='T1')
elfi.Distance('minkowski', m['T1'], p=1, name='d')
m['BDM'].uses_meta = True
# Warn the user if the executable is not present
if not os.path.isfile('bdm') and not os.path.isfile('bdm.exe'):
cpp_path = get_sources_path()
warnings.warn(
"This model uses an external simulator `bdm` implemented in C++ "
"that needs to be compiled and copied to your working directory. "
"We could not find it from your current working directory. Please"
"copy the folder `{}` to your working directory "
"and compile the source.".format(cpp_path), RuntimeWarning)
return m
def get_model(n_obs=50, true_params=None, seed_obs=None, stochastic=True):
"""Returns a complete Ricker model in inference task.
This is a simplified example that achieves reasonable predictions. For more extensive treatment
and description using 13 summary statistics, see:
Wood, S. N. (2010) Statistical inference for noisy nonlinear ecological dynamic systems,
Nature 466, 1102–1107.
Parameters
----------
n_obs : int, optional
Number of observations.
true_params : list, optional
Parameters with which the observed data is generated.
seed_obs : None, int, optional
Seed for the observed data generation.
stochastic : bool, optional
Whether to use the stochastic or deterministic Ricker model.
Returns
-------
m : elfi.ElfiModel
"""
if stochastic:
simulator = partial(stochastic_ricker, n_obs=n_obs)
if true_params is None:
true_params = [3.8, 0.3, 10.]
else:
simulator = partial(ricker, n_obs=n_obs)
if true_params is None:
true_params = [3.8]
m = elfi.ElfiModel()
y_obs = simulator(*true_params, n_obs=n_obs, random_state=np.random.RandomState(seed_obs))
sim_fn = partial(simulator, n_obs=n_obs)
sumstats = []
if stochastic:
elfi.Prior(ss.expon, np.e, 2, model=m, name='t1')
elfi.Prior(ss.truncnorm, 0, 5, model=m, name='t2')
elfi.Prior(ss.uniform, 0, 100, model=m, name='t3')
elfi.Simulator(sim_fn, m['t1'], m['t2'], m['t3'], observed=y_obs, name='Ricker')
sumstats.append(elfi.Summary(partial(np.mean, axis=1), m['Ricker'], name='Mean'))
sumstats.append(elfi.Summary(partial(np.var, axis=1), m['Ricker'], name='Var'))
sumstats.append(elfi.Summary(num_zeros, m['Ricker'], name='#0'))
elfi.Discrepancy(chi_squared, *sumstats, name='d')
else: # very simple deterministic case
elfi.Prior(ss.expon, np.e, model=m, name='t1')
elfi.Simulator(sim_fn, m['t1'], observed=y_obs, name='Ricker')
sumstats.append(elfi.Summary(partial(np.mean, axis=1), m['Ricker'], name='Mean'))
elfi.Distance('euclidean', *sumstats, name='d')
return m
def build(self,
model,
pattern,
prior_pos,
prior_cov=64,
r_bound=47.9,
pmt_mask=np.ones(127)):
### Build Priors
px = elfi.Prior(BoundedNormal_x, r_bound, prior_pos, prior_cov)
py = elfi.Prior(BoundedNormal_y, px, r_bound, prior_pos, prior_cov)
### Build Model
model = elfi.tools.vectorize(model)
Y = elfi.Simulator(model, px, py, observed=np.array([pattern]))
# TODO implement PMT mask here
#def summarize(data, key):
# # Select either energy or time for model output.
# return np.array([v[key] for v in data])
def summarize(data):
return np.array(
[list(v['energy']) + list(v['time']) for v in data])
# Build summary stat for energy and time
#S1 = elfi.Summary(summarize, Y, 'energy')
#S2 = elfi.Summary(summarize, Y, 'time')
S1 = elfi.Summary(summarize, Y)
d = elfi.Distance('braycurtis', S1)
log_d = elfi.Operation(np.log, d)
# set the ELFI model so we can remove it later
self.model = px.model
### Setup BOLFI
bounds = {'px': (-r_bound, r_bound), 'py': (-r_bound, r_bound)}
target_model = GPyRegression(log_d.model.parameter_names,
bounds=bounds)
acquisition_method = ConstraintLCBSC(target_model,
prior=ModelPrior(log_d.model),
noise_var=[1, 1],
exploration_rate=10)
bolfi = elfi.BOLFI(
log_d,
batch_size=1,
initial_evidence=50,
update_interval=1,
# bounds=bounds, # Not used when using target_model
target_model=target_model,
# acq_noise_var=[0.1, 0.1], # Not used when using acq method
acquisition_method=acquisition_method,
)
return bolfi
def multivariate_model(request):
ndim = request.param
m = elfi.ElfiModel()
elfi.Prior(ss.multivariate_normal, [0] * ndim, model=m, name='t1')
elfi.Simulator(rowsummer,
m['t1'],
observed=np.array([[0]]),
model=m,
name='sim')
elfi.Distance('euclidean', m['sim'], model=m, name='d')
return m
def new_sample(MA2, t_prior, t_prior_name, N=500, y_obs=y_obs):
# ELFI also supports giving the scipy.stats distributions as strings
Y = elfi.Simulator(MA2, t_prior, observed=y_obs)
S1 = elfi.Summary(autocov, Y)
S2 = elfi.Summary(autocov, Y,
2) # the optional keyword lag is given the value 2
d = elfi.Distance('euclidean', S1, S2)
rej = elfi.Rejection(d, batch_size=5000, seed=np.random.randint(10**5))
result = rej.sample(N, quantile=0.01)
return result.samples[t_prior_name].mean(axis=0)
def multivariate_model(request):
ndim = request.param
def fun(x, batch_size, random_state):
return np.sum(x, keepdims=True, axis=1)
m = elfi.ElfiModel()
elfi.Prior(ss.multivariate_normal, [0] * ndim, model=m, name='t1')
elfi.Simulator(fun, m['t1'], observed=np.array([[0]]), model=m, name='sim')
elfi.Distance('euclidean', m['sim'], model=m, name='d')
return m
def sleep_model(request):
"""The true param will be half of the given sleep time."""
ub_sec = request.param or .5
m = elfi.ElfiModel()
elfi.Constant(ub_sec, model=m, name='ub')
elfi.Prior('uniform', 0, m['ub'], model=m, name='sec')
elfi.Simulator(sleeper, m['sec'], model=m, name='slept')
elfi.Summary(no_op, m['slept'], model=m, name='summary')
elfi.Distance('euclidean', m['summary'], model=m, name='d')
m.observed['slept'] = ub_sec / 2
return m
def predict(self, data_test):
elfi.new_model("SMC")
prior = elfi.Prior(MVUniform, self.p_lower, self.p_upper)
sim = elfi.Simulator(self.simulator,
prior,
observed=data_test,
name='sim')
SS = elfi.Summary(self.identity, sim, name='identity')
d = elfi.Distance('euclidean', SS, name='d')
smc = elfi.SMC(d, batch_size=1, seed=42)
samples = smc.sample(self.n_particles, [self.threshold])
return samples.samples_array
def get_model(n_obs=50, true_params=None, seed_obs=None, **kwargs):
"""Return a complete Lotka-Volterra model in inference task.
Parameters
----------
n_obs : int, optional
Number of observations.
true_params : list, optional
Parameters with which the observed data is generated.
seed_obs : int, optional
Seed for the observed data generation.
Returns
-------
m : elfi.ElfiModel
"""
logger = logging.getLogger()
if true_params is None:
true_params = [1.0, 0.005, 0.6, 50, 100, 10.]
kwargs['n_obs'] = n_obs
y_obs = lotka_volterra(*true_params,
random_state=np.random.RandomState(seed_obs),
**kwargs)
m = elfi.ElfiModel()
sim_fn = partial(lotka_volterra, **kwargs)
priors = []
sumstats = []
priors.append(elfi.Prior(ExpUniform, -6., 2., model=m, name='r1'))
priors.append(elfi.Prior(ExpUniform, -6., 2., model=m,
name='r2')) # easily kills populations
priors.append(elfi.Prior(ExpUniform, -6., 2., model=m, name='r3'))
priors.append(elfi.Prior('poisson', 50, model=m, name='prey0'))
priors.append(elfi.Prior('poisson', 100, model=m, name='predator0'))
priors.append(
elfi.Prior(ExpUniform, np.log(0.5), np.log(50), model=m, name='sigma'))
elfi.Simulator(sim_fn, *priors, observed=y_obs, name='LV')
sumstats.append(
elfi.Summary(partial(pick_stock, species=0), m['LV'], name='prey'))
sumstats.append(
elfi.Summary(partial(pick_stock, species=1), m['LV'], name='predator'))
elfi.Distance('sqeuclidean', *sumstats, name='d')
logger.info(
"Generated %i observations with true parameters r1: %.1f, r2: %.3f, r3: %.1f, "
"prey0: %i, predator0: %i, sigma: %.1f.", n_obs, *true_params)
return m
def get_model(self, n_obs=100, true_params=None, seed_obs=None):
"""Return a complete model in inference task.
Parameters
----------
n_obs : int, optional
observation length of the MA2 process
true_params : list, optional
parameters with which the observed data is generated
seed_obs : int, optional
seed for the observed data generation
Returns
-------
m : elfi.ElfiModel
"""
m = elfi.ElfiModel()
if true_params is None and self.env_name == "CartPole-v0":
# gravity, masscart, masspole, length, force_mag
true_params = [[9.8], [1.0], [0.1], [0.5], [10.0]]
elfi.Prior('uniform', 5.0, 10.0, model=m, name='gravity')
elfi.Prior('uniform', 0.1, 5, model=m, name='masscart')
elfi.Prior('uniform', 0.1, 5, model=m, name='masspole')
elfi.Prior('uniform', 0.1, 5, model=m, name='length')
elfi.Prior('uniform', 5.0, 10.0, model=m, name='force_mag')
params = [
m['gravity'], m['masscart'], m['masspole'], m['length'],
m['force_mag']
]
elif true_params is None and self.env_name == "MountainCar-v0":
# goal_position, goal_velocity, force, gravity
true_params = [0.5, 0, 0.001, 0.0025]
elfi.Prior('uniform', -1.2, 0.6, model=m, name='goal_position')
elfi.Prior('uniform', 0, 5.0, model=m, name='goal_velocity')
elfi.Prior('uniform', 0.0001, 0.01, model=m, name='force')
elfi.Prior('uniform', 0.0001, 0.01, model=m, name='gravity')
params = [
m['goal_position'], m['goal_velocity'], m['force'],
m['gravity']
]
y_obs = self.func(*true_params,
random_state=np.random.RandomState(seed_obs))
elfi.Simulator(self.func, *params, observed=y_obs, name='DGP')
elfi.Distance('euclidean', m['DGP'], name='d')
return m
def get_model(self, n_obs=100, true_params=None, seed_obs=None):
m = elfi.new_model()
elfi.Prior('uniform', -2, 4, name='x')
elfi.Prior('uniform', -2, 4, name='y')
params = [m['x'], m['y']]
if true_params is None:
true_params = [[1.5, 1]]
y_obs = self.func(*true_params, random_state=np.random.RandomState(seed_obs))
y_obs = [np.mean(y_obs), np.std(y_obs)]
elfi.Simulator(self.func, *params, observed=y_obs, name='sim')
# elfi.Summary(partial(np.mean, axis=1), m['sim'], name='Mean')
# elfi.Summary(partial(np.std, axis=1), m['sim'], name='Std')
elfi.Distance('euclidean', m['sim'], name='dist')
return m
def build(self,
model,
pattern,
prior_pos,
prior_cov=25,
r_bound=47.9,
pmt_mask=np.ones(127)):
### Build Priors
px = elfi.Prior(BoundedNormal_x, r_bound, prior_pos, prior_cov)
py = elfi.Prior(BoundedNormal_y, px, r_bound, prior_pos, prior_cov)
### Build Model
model = elfi.tools.vectorize(model)
Y = elfi.Simulator(model, px, py, observed=np.array([pattern]))
# TODO implement PMT mask here
d = elfi.Distance('braycurtis', Y)
log_d = elfi.Operation(np.log, d)
# set the ELFI model so we can remove it later
self.model = px.model
### Setup BOLFI
bounds = {'px': (-r_bound, r_bound), 'py': (-r_bound, r_bound)}
target_model = GPyRegression(log_d.model.parameter_names,
bounds=bounds)
acquisition_method = ConstraintLCBSC(target_model,
prior=ModelPrior(log_d.model),
noise_var=[5, 5],
exploration_rate=10)
bolfi = elfi.BOLFI(
log_d,
batch_size=1,
initial_evidence=50,
update_interval=1,
# bounds=bounds, # Not used when using target_model
target_model=target_model,
# acq_noise_var=[0.1, 0.1], # Not used when using acq method
acquisition_method=acquisition_method,
)
return bolfi
def _obtain_accepted_thetas(self, set_ss, n_sim, n_acc, batch_size):
"""Perform the ABC-rejection sampling and identify `closest' parameters.
The sampling is performed using the initialised simulator.
Parameters
----------
set_ss : List
Summary-statistics combination to be used in the rejection sampling.
n_sim : int
Number of the iterations of the rejection sampling.
n_acc : int
Number of the accepted parameters.
batch_size : int
Number of samples per batch.
Returns
-------
array_like
Accepted parameters.
"""
# Initialise the distance function.
m = self.simulator.model.copy()
list_ss = []
for ss in set_ss:
list_ss.append(elfi.Summary(ss, m[self.simulator.name], model=m))
if isinstance(self.fn_distance, str):
d = elfi.Distance(self.fn_distance, *list_ss, model=m)
else:
d = elfi.Discrepancy(self.fn_distance, *list_ss, model=m)
# Run the simulations.
# TODO: include different distance functions in the summary-statistics combinations.
sampler_rejection = elfi.Rejection(d,
batch_size=batch_size,
seed=self.seed,
pool=self.pool)
result = sampler_rejection.sample(n_acc, n_sim=n_sim)
# Extract the accepted parameters.
thetas_acc = result.samples_array
return thetas_acc
def test_dict_output():
vsim = elfi.tools.vectorize(simulator)
vsum = elfi.tools.vectorize(summary)
obs = simulator([.2, .8])
elfi.new_model()
p = elfi.Prior('dirichlet', [2, 2])
sim = elfi.Simulator(vsim, p, observed=obs)
S = elfi.Summary(vsum, sim)
d = elfi.Distance('euclidean', S)
pool = elfi.OutputPool(['sim'])
rej = elfi.Rejection(d, batch_size=100, pool=pool, output_names=['sim'])
sample = rej.sample(100, n_sim=1000)
mean = np.mean(sample.samples['p'], axis=0)
# Crude test
assert mean[1] > mean[0]
def get_model(self, n_obs=10, true_params=None, seed_obs=None):
m = elfi.new_model()
# Parameters: ns, kc, alpha, r_star, As
# priors from Sinha and Souradeep 2006.
elfi.Prior('uniform', 0.5, 1.0, name='ns')
elfi.Prior('uniform', 1e-7, 1e-3, name='kc')
elfi.Prior('uniform', 0., 10., name='alpha')
elfi.Prior('uniform', 0., 1., name='r_star')
elfi.Prior('uniform', 2.7, 1.3, name='As')
params = [m['ns'], m['kc'], m['alpha'], m['r_star'], m['As']]
if true_params is None:
true_params = [[0.96, 0.0003, 0.58, 0.75, 3.35]]
y_obs = self.func(*true_params,
random_state=np.random.RandomState(seed_obs))
elfi.Simulator(self.func, *params, observed=y_obs, name='sim')
elfi.Distance('euclidean', m['sim'], name='dist')
return m
def predict(self, data_test):
elfi.new_model("BOLFI")
prior = elfi.Prior(MVUniform, self.p_lower, self.p_upper)
sim = elfi.Simulator(self.simulator,
prior,
observed=data_test,
name='sim')
SS = elfi.Summary(self.identity, sim, name='identity')
d = elfi.Distance('euclidean', SS, name='d')
log_d = elfi.Operation(np.log, d)
bolfi = elfi.BOLFI(log_d,
batch_size=1,
initial_evidence=20,
update_interval=10,
acq_noise_var=self.p_lower.size * [0.1],
bounds=None,
seed=42)
bolfi.fit(n_evidence=self.n_particles)
post = bolfi.extract_posterior(-1.)
samples = post.model.X
return samples
def main():
global eng
datadir = Path('/home/ben/phd/stfp/abc_results/gradientNet')
eng = matlab.engine.start_matlab()
eng.addpath(eng.genpath('~/phd/stfp/abc_code'))
eng.addpath(eng.genpath('~/phd/easySim'))
maxConnProbOB2E_prior = elfi.Prior('uniform', 0, 1)
maxConnProbOB2I_prior = elfi.Prior('uniform', 0, 1)
maxConnProbGC2E_prior = elfi.Prior('uniform', 0, 1)
maxConnProbGC2I_prior = elfi.Prior('uniform', 0, 1)
sigmaOB2PC_prior = elfi.Prior('uniform', 1e-6, 1000e-6)
sigmaGC2PC_prior = elfi.Prior('uniform', 1e-6, 1000e-6)
sim = elfi.Simulator(simulator,
maxConnProbOB2E_prior,
maxConnProbOB2I_prior,
maxConnProbGC2E_prior,
maxConnProbGC2I_prior,
sigmaOB2PC_prior,
sigmaGC2PC_prior,
observed=0)
S = elfi.Summary(score_network, sim)
d = elfi.Distance('euclidean', S)
#log_d = elfi.Operation(np.log, d)
pool = elfi.OutputPool([
'connProbOB2E_prior', 'connProbOB2I_prior', 'connProbGC2E_prior',
'connProbGC2I_prior', 'sigmaOB2PC_prior', 'sigmaGC2PC_prior', 'S', 'd'
])
ie_maxConnProbOB2E, ie_maxConnProbOB2I, ie_maxConnProbGC2E, ie_maxConnProbGC2I, ie_sigmaOB2PC, ie_sigmaGC2PC, ie_scores = eng.load_initial_evidence_gradientNet(
'/home/ben/phd/stfp/abc_results/gradientNet', nargout=7)
ie_maxConnProbOB2E = np.asarray(ie_maxConnProbOB2E)
ie_maxConnProbOB2I = np.asarray(ie_maxConnProbOB2I)
ie_maxConnProbGC2E = np.asarray(ie_maxConnProbGC2E)
ie_maxConnProbGC2I = np.asarray(ie_maxConnProbGC2I)
ie_sigmaOB2PC = np.asarray(ie_sigmaOB2PC)
ie_sigmaGC2PC = np.asarray(ie_sigmaGC2PC)
ie_scores = np.asarray(ie_scores)
#ie_log_scores = np.log(ie_scores)
if not ie_maxConnProbOB2E.any():
ie = 10
print('0 prior runs detected')
else:
ie = {
'maxConnProbOB2E_prior': ie_maxConnProbOB2E,
'maxConnProbOB2I_prior': ie_maxConnProbOB2I,
'maxConnProbGC2E_prior': ie_maxConnProbGC2E,
'maxConnProbGC2I_prior': ie_maxConnProbGC2I,
'sigmaOB2PC_prior': ie_sigmaOB2PC,
'sigmaGC2PC_prior': ie_sigmaGC2PC,
'd': ie_scores
}
print(
str(ie_maxConnProbOB2E.size) +
' prior runs detected... using as initial evidence')
bolfi = elfi.BOLFI(d,
batch_size=1,
initial_evidence=ie,
update_interval=1,
bounds={
'maxConnProbOB2E_prior': (0, 1),
'maxConnProbOB2I_prior': (0, 1),
'maxConnProbGC2E_prior': (0, 1),
'maxConnProbGC2I_prior': (0, 1),
'sigmaOB2PC_prior': (1e-6, 1000e-6),
'sigmaGC2PC_prior': (1e-6, 1000e-6)
},
acq_noise_var=[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
pool=pool)
posterior = bolfi.fit(n_evidence=500)
with open(datadir / 'bolfi_result.pkl', 'wb') as fname:
pickle.dump(bolfi, fname)
#bolfi.plot_state()
bolfi.plot_discrepancy()
plt.show(block=True)
# Set the generating parameters that we will try to infer
mean0 = 1
std0 = 3
alpha0 = 3.5
# Generate some data (using a fixed seed here)
np.random.seed(20170525)
y0 = simulator(mean0, std0, alpha0)
print(y0)
# Add the simulator node and observed data to the model
sim = elfi.Simulator(simulator, mu, sigma, alpha, observed=y0)
# Add summary statistics to the model
S1 = elfi.Summary(mean, sim)
S2 = elfi.Summary(var, sim)
# Specify distance as euclidean between summary vectors (S1, S2) from simulated and
# observed data
d = elfi.Distance('euclidean', S1, S2)
#### Plot the complete model (requires graphviz)
# elfi.draw(d)
rej = elfi.Rejection(d, batch_size=10000, seed=30052017)
res = rej.sample(10000, threshold=.5)
print(res)
import matplotlib.pyplot as plt
res.plot_marginals()
plt.show()
def get_model(true_params=None,
seed_obs=None,
initial_state=None,
n_obs=40,
f=10.,
phi=0.984,
total_duration=4):
"""Return a complete Lorenz model in inference task.
This is a simplified example that achieves reasonable predictions.
Hakkarainen, J., Ilin, A., Solonen, A., Laine, M., Haario, H., Tamminen,
J., Oja, E., and Järvinen, H. (2012). On closure parameter estimation in
chaotic systems. Nonlinear Processes in Geophysics, 19(1), 127–143.
Parameters
----------
true_params : list, optional
Parameters with which the observed data is generated.
seed_obs : int, optional
Seed for the observed data generation.
initial_state : ndarray
Initial state value of the time-series.
n_obs : int, optional
Number of observed variables
f : float, optional
Force term
phi : float, optional
This value is used to express stochastic forcing term. It should be configured according
to force term and eventually impacts to the result of eta.
More details in Wilks (2005) et al.
total_duration : float, optional
Returns
-------
m : elfi.ElfiModel
"""
simulator = partial(forecast_lorenz,
initial_state=initial_state,
f=f,
n_obs=n_obs,
phi=phi,
total_duration=total_duration)
if not true_params:
true_params = [2.0, 0.1]
m = elfi.ElfiModel()
y_obs = simulator(*true_params,
random_state=np.random.RandomState(seed_obs))
sumstats = []
elfi.Prior('uniform', 0.5, 3., model=m, name='theta1')
elfi.Prior('uniform', 0, 0.3, model=m, name='theta2')
elfi.Simulator(simulator,
m['theta1'],
m['theta2'],
observed=y_obs,
name='Lorenz')
sumstats.append(elfi.Summary(mean, m['Lorenz'], name='Mean'))
sumstats.append(elfi.Summary(var, m['Lorenz'], name='Var'))
sumstats.append(elfi.Summary(autocov, m['Lorenz'], name='Autocov'))
sumstats.append(elfi.Summary(cov, m['Lorenz'], name='Cov'))
sumstats.append(elfi.Summary(xcov, m['Lorenz'], True, name='CrosscovPrev'))
sumstats.append(elfi.Summary(xcov, m['Lorenz'], False,
name='CrosscovNext'))
elfi.Distance('euclidean', *sumstats, name='d')
return m
############# DEFINE ELFI MODEL ##################
def simulator(theta, dim, batch_size=10000, random_state=None):
likelihood = Likelihood()
theta = np.repeat(theta, dim, -1)
return likelihood.rvs(theta, seed=random_state)
elfi.new_model("1D_example")
elfi_prior = elfi.Prior(Prior(), name="theta")
elfi_simulator = elfi.Simulator(simulator,
elfi_prior,
dim,
observed=np.expand_dims(data, 0),
name="simulator")
dist = elfi.Distance('euclidean', elfi_simulator, name="dist")
bounds = [(-2.5, 2.5)]
dim = data.shape[-1]
# Defines the ROMC inference method
romc = elfi.ROMC(dist, bounds)
romc1 = elfi.ROMC(dist, bounds)
romc2 = elfi.ROMC(dist, bounds)
romc3 = elfi.ROMC(dist, bounds)
############# Gradients ###################
seed = 21
eps = 1
n1 = np.linspace(1, 101, 10)
solve_grad = []
prior_args = [m[name] for name in m.parameter_names]
elfi.Simulator(elfi_sim,
*prior_args,
m["length"],
m["recombination_rate"],
m["mutation_rate"],
priors,
name="sim",
model=m)
elfi.Summary(elfi_sum, m["sim"], name="sum", model=m)
elfi.Summary(elfi_sum_scaler, m["sum"], None,
name="sum_scaler") # Placeholder (no scaling yet)
elfi.Distance('euclidean', m["sum_scaler"], name='d', model=m)
# Rejection to "train" sum stat scaler
start_time = time.time()
pool = elfi.OutputPool(['sum'])
rej = elfi.Rejection(m['d'], batch_size=1, seed=1, pool=pool)
rej.sample(train_scaler_n_sim, quantile=1, bar=False) # Accept all
sum_stats = pool.get_store('sum')
sum_stats = np.array(list(sum_stats.values()))
sum_stats = sum_stats.reshape(-1, sum_stats.shape[2]) # Drop batches axis
scaler = StandardScaler()
scaler.fit(sum_stats)
elapsed_time = time.time() - start_time
logging.info(
f"{train_scaler_n_sim} simulations to train standard scaler completed in {elapsed_time/60:.2f} minutes"
)
X,
N,
K,
r,
alphaprior1,
alphaprior2,
alphaprior3,
alphaprior4,
alphaprior5,
alphaprior6,
tau,
measurement_idx,
observed=observeddata)
summary = elfi.Summary(logdestack, simulator_results)
d = elfi.Distance('euclidean', summary)
#log_d = elfi.Operation(np.log, d)
bolfi = elfi.BOLFI(d,
batch_size=1,
initial_evidence=100,
update_interval=10,
bounds={
'alphaprior1': (0, 5),
'alphaprior2': (0, 5),
'alphaprior3': (0, 5),
'alphaprior4': (0, 5),
'alphaprior5': (0, 5),
'alphaprior6': (0, 5)
},
acq_noise_var=[0.01, 0.01, 0.01, 0.01, 0.01, 0.01],
def main(base, output, number_processes):
# generate null (should only execute once)
use = 'BOLFI'
#use = 'SINGLE'
if use != 'SINGLE':
click.secho('Generating null dataset', fg='yellow')
subprocess.check_call(
["snakemake", "null", "--profile", "elfi_profile"])
click.secho('Creating environments', fg='yellow')
subprocess.check_call(
["snakemake", "--profile", "elfi_profile", "--create-envs-only"])
click.secho('Starting BOLFI', fg='yellow')
if base:
global base_output
base_output = base
if output:
global summary_output
summary_output = output
# setup priors
elfi.set_client(multiprocessing.Client(num_processes=number_processes))
model = elfi.ElfiModel(name='msprime')
elfi.Prior('uniform', 0, 0.5, model=model, name='n1')
elfi.Prior('uniform', 0, 0.5, model=model, name='n2')
elfi.Prior('uniform', 0, 1, model=model, name='split_prop')
elfi.Prior('uniform', 1, 1861, model=model, name='split_size')
snake_sim = elfi.tools.external_operation(command,
prepare_inputs=prepare_inputs,
process_result=process_result,
stdout=False)
vec_snake = elfi.tools.vectorize(snake_sim)
empirical = np.array([
0, # desert MSE
0.291761,
0.328705,
0.335145, # pi
0.12985,
0.156539,
0.0921547, # fst
0.023,
0.019
]) # admix
snake_node = elfi.Simulator(vec_snake,
model['n1'],
model['n2'],
model['split_prop'],
model['split_size'],
observed=empirical,
name='snake_sim')
snake_node.uses_meta = True
distance = elfi.Distance('euclidean', snake_node, name='dist')
if use == 'SINGLE':
print(
snake_sim(0.1,
0.1,
0.1,
100,
seed=2,
meta={
'model_name': 'test',
'batch_index': 1,
'submission_index': 2
}))
return
elif use == 'BOLFI':
pool = elfi.ArrayPool(
['n1', 'n2', 'split_prop', 'split_size', 'snake_sim'],
name='bolfi_pool')
bolfi = elfi.BOLFI(distance,
batch_size=1,
initial_evidence=20,
update_interval=3,
bounds={
'n1': (0, 0.5),
'n2': (0, 0.5),
'split_prop': (0, 1),
'split_size': (1, 1861)
},
pool=pool)
post = bolfi.fit(n_evidence=10, bar=False)
click.secho('Saving results', fg='yellow')
pool.save()
post.save()
click.secho('Done', fg='green')
return
