def fit_model():
M = MCMC(disaster_model)
M.sample(iter=10000, burn=1000, thin=10)
print('switchpoint: ', M.trace('switchpoint')[:])
print('hist: ', hist(M.trace('late_mean')[:]))
# show()
plot(M)
def estimate_failures(samples, #samples from noisy labelers
n_samples=10000, #number of samples to run MCMC for
burn=None, #burn-in. Defaults to n_samples/2
thin=10, #thinning rate. Sample every k samples from markov chain
alpha_p=1, beta_p=1, #beta parameters for true positive rate
alpha_e=1, beta_e=10 #beta parameters for noise rates
):
if burn is None:
burn = n_samples / 2
S,N = samples.shape
p = Beta('p', alpha=alpha_p, beta=beta_p) #prior on true label
l = Bernoulli('l', p=p, size=S)
e_pos = Beta('e_pos', alpha_e, beta_e, size=N) # error rate if label = 1
e_neg = Beta('e_neg', alpha_e, beta_e, size=N) # error rate if label = 0
@deterministic(plot=False)
def noise_rate(l=l, e_pos=e_pos, e_neg=e_neg):
#probability that a noisy labeler puts a label 1
return np.outer(l, 1-e_pos) + np.outer(1-l, e_neg)
noisy_label = Bernoulli('noisy_label', p=noise_rate, size=samples.shape, value=samples, observed=True)
variables = [l, e_pos, e_neg, p, noisy_label, noise_rate]
model = MCMC(variables, verbose=3)
model.sample(iter=n_samples, burn=burn, thin=thin)
model.write_csv('out.csv', ['p', 'e_pos', 'e_neg'])
p = np.median(model.trace('p')[:])
e_pos = np.median(model.trace('e_pos')[:],0)
e_neg = np.median(model.trace('e_neg')[:],0)
return p, e_pos, e_neg
def compute(
self,
observation,
prediction,
observation_name='observation',
prediction_name='prediction',
mcmc_iter=110000,
mcmc_burn=10000,
effect_size_type='mode', # 'mean'
assume_normal=False,
**kwargs):
if not pymc:
raise ImportError('Module best or pymc could not be loaded!')
data_dict = {
observation_name: observation,
prediction_name: prediction
}
best_model = self.make_model(data_dict, assume_normal)
M = MCMC(best_model)
M.sample(iter=mcmc_iter, burn=mcmc_burn)
group1_data = M.get_node(observation_name).value
group2_data = M.get_node(prediction_name).value
N1 = len(group1_data)
N2 = len(group2_data)
posterior_mean1 = M.trace('group1_mean')[:]
posterior_mean2 = M.trace('group2_mean')[:]
diff_means = posterior_mean1 - posterior_mean2
posterior_std1 = M.trace('group1_std')[:]
posterior_std2 = M.trace('group2_std')[:]
pooled_var = ((N1 - 1) * posterior_std1**2 +
(N2 - 1) * posterior_std2**2) / (N1 + N2 - 2)
self.effect_size = diff_means / np.sqrt(pooled_var)
stats = best.calculate_sample_statistics(self.effect_size)
self.score = best_effect_size(stats[effect_size_type])
self.score.mcmc_iter = mcmc_iter
self.score.mcmc_burn = mcmc_burn
self.score.data_size = [N1, N2]
self.score.HDI = (stats['hdi_min'], stats['hdi_max'])
self.HDI = self.score.HDI
return self.score
def analizeMwm():
masked_values = np.ma.masked_equal(x, value=None)
print("m v: ", masked_values)
print("dmwm da: ", dmwm.disasters_array)
Mwm = MCMC(dmwm)
Mwm.sample(iter=10000, burn=1000, thin=10)
print("Mwm t: ", Mwm.trace('switchpoint')[:])
hist(Mwm.trace('late_mean')[:])
# show()
plot(Mwm)
def test_simple(self):
# Priors
mu = Normal('mu', mu=0, tau=0.0001)
s = Uniform('s', lower=0, upper=100, value=10)
tau = s**-2
# Likelihood with missing data
x = Normal('x', mu=mu, tau=tau, value=m, observed=True)
# Instantiate sampler
M = MCMC([mu, s, tau, x])
# Run sampler
M.sample(10000, 5000, progress_bar=0)
# Check length of value
assert_equal(len(x.value), 100)
# Check size of trace
tr = M.trace('x')()
assert_equal(shape(tr), (5000, 2))
sd2 = [-2 < i < 2 for i in ravel(tr)]
# Check for standard normal output
assert_almost_equal(sum(sd2) / 10000., 0.95, decimal=1)
def test_nd(self):
M = MCMC([self.NDstoch()], db=self.name, dbname=os.path.join(testdir, 'ND.'+self.name), dbmode='w')
M.sample(10, progress_bar=0)
a = M.trace('nd')[:]
assert_equal(a.shape, (10,2,2))
db = getattr(pymc.database, self.name).load(os.path.join(testdir, 'ND.'+self.name))
assert_equal(db.trace('nd')[:], a)
def test_simple(self):
# Priors
mu = Normal('mu', mu=0, tau=0.0001)
s = Uniform('s', lower=0, upper=100, value=10)
tau = s ** -2
# Likelihood with missing data
x = Normal('x', mu=mu, tau=tau, value=m, observed=True)
# Instantiate sampler
M = MCMC([mu, s, tau, x])
# Run sampler
M.sample(10000, 5000, progress_bar=0)
# Check length of value
assert_equal(len(x.value), 100)
# Check size of trace
tr = M.trace('x')()
assert_equal(shape(tr), (5000, 2))
sd2 = [-2 < i < 2 for i in ravel(tr)]
# Check for standard normal output
assert_almost_equal(sum(sd2) / 10000., 0.95, decimal=1)
def compute(
self,
observation,
prediction,
observation_name='observation',
prediction_name='prediction',
mcmc_iter=110000,
mcmc_burn=10000,
effect_size_type='mode', # 'mean'
**kwargs):
self.mcmc_iter = mcmc_iter
self.mcmc_burn = mcmc_burn
data_dict = {
observation_name: observation,
prediction_name: prediction
}
best_model = self.make_model(data_dict)
M = MCMC(best_model)
M.sample(iter=mcmc_iter, burn=mcmc_burn)
group1_data = M.get_node(observation_name).value
group2_data = M.get_node(prediction_name).value
N1 = len(group1_data)
N2 = len(group2_data)
self.data_size = [N1, N2]
posterior_mean1 = M.trace('group1_mean')[:]
posterior_mean2 = M.trace('group2_mean')[:]
diff_means = posterior_mean1 - posterior_mean2
posterior_std1 = M.trace('group1_std')[:]
posterior_std2 = M.trace('group2_std')[:]
pooled_var = ((N1 - 1) * posterior_std1**2 +
(N2 - 1) * posterior_std2**2) / (N1 + N2 - 2)
self.effect_size = diff_means / np.sqrt(pooled_var)
stats = best.calculate_sample_statistics(self.effect_size)
self.HDI = (stats['hdi_min'], stats['hdi_max'])
self.score = best_effect_size(stats[effect_size_type])
return self.score
def bimodal_gauss(data,pm,dmin=0.3):
'''run MCMC to get regression on bimodal normal distribution'''
size = len(data[pm])
### set up model
p = Uniform( "p", 0.2 , 0.8) #this is the fraction that come from mean1 vs mean2
# p = distributions.truncated_normal_like('p', mu=0.5, tau=0.001, a=0., b=1.)
# p = Normal( 'p', mu=(1.*sum(comp0==1))/size, tau=1./0.1**2 ) # attention: wings!, tau = 1/sig^2
# p = Normal( 'p', mu=0.5, tau=1./0.1**2 ) # attention: wings!, tau = 1/sig^2
ber = Bernoulli( "ber", p = p, size = size) # produces 1 with proportion p
precision = Gamma('precision', alpha=0.01, beta=0.01)
mean1 = Uniform( "mean1", -0.5, 1.0) # if not truncated
sig1 = Uniform( 'sig1', 0.01, 1.)
mean2 = Uniform( "mean2", mean1 + dmin, 1.5)
sig2 = Uniform( 'sig2', 0.01, 1.)
pop1 = Normal( 'pop1', mean1, 1./sig1**2) # tau is 1/sig^2
pop2 = Normal( 'pop2', mean2, 1./sig2**2)
@deterministic
def bimod(ber = ber, pop1 = pop1, pop2 = pop2): # value determined from parents completely
return ber*pop1 + (1-ber)*pop2
obs = Normal( "obs", bimod, precision, value = data[pm], observed = True)
model = Model( {"p":p, "precision": precision, "mean1": mean1, 'sig1': sig1, "mean2":mean2, 'sig2':sig2, "obs":obs} )
from pymc import MCMC, Matplot
M = MCMC(locals(), db='pickle', dbname='metals.pickle')
iter = 10000; burn = 9000; thin = 10
M.sample(iter=iter, burn=burn, thin=thin)
M.db.commit()
mu1 = np.mean(M.trace('mean1')[:])
sig1= np.mean(M.trace('sig1')[:])
mu2 = np.mean(M.trace('mean2')[:])
sig2= np.mean(M.trace('sig2')[:])
p = np.mean(M.trace('p')[:])
return p, mu1, sig1, mu2, sig2, M
def analizeM():
M = MCMC(dm)
print("M: ", M)
M.sample(iter=10000, burn=1000, thin=10)
print("M t: ", M.trace('switchpoint')[:])
hist(M.trace('late_mean')[:])
# show()
plot(M)
# show()
print("M smd dm sp: ", M.step_method_dict[dm.switchpoint])
print("M smd dm em: ", M.step_method_dict[dm.early_mean])
print("M smd dm lm: ", M.step_method_dict[dm.late_mean])
M.use_step_method(Metropolis, dm.late_mean, proposal_sd=2.)
def bimodal_gauss(data,pm):
'''run MCMC to get regression on bimodal normal distribution'''
m1 = np.mean(data[pm])/2.
m2 = np.mean(data[pm])*2.
dm = m2 - m1
size = len(data[pm])
### set up model
p = Uniform( "p", 0.2 , 0.8) #this is the fraction that come from mean1 vs mean2
# p = distributions.truncated_normal_like('p', mu=0.5, tau=0.001, a=0., b=1.)
# p = Normal( 'p', mu=(1.*sum(comp0==1))/size, tau=1./0.1**2 ) # attention: wings!, tau = 1/sig^2
# p = Normal( 'p', mu=0.5, tau=1./0.1**2 ) # attention: wings!, tau = 1/sig^2
ber = Bernoulli( "ber", p = p, size = size) # produces 1 with proportion p
precision = Gamma('precision', alpha=0.01, beta=0.01)
dmu = Normal( 'dmu', dm, tau=1./0.05**2 ) # [PS] give difference between means, finite
# dmu = Lognormal( 'dmu', 0.3, tau=1./0.1**2)
mean1 = Normal( "mean1", mu = m1, tau = 1./0.1**2 ) # better to use Normals versus Uniforms,
# if not truncated
mean2 = Normal( "mean2", mu = mean1 + dmu, tau = 1./0.1**2 ) # tau is 1/sig^2
@deterministic
def mean( ber = ber, mean1 = mean1, mean2 = mean2):
return ber*mean1 + (1-ber)*mean2
obs = Normal( "obs", mean, precision, value = data[pm], observed = True)
model = Model( {"p":p, "precision": precision, "mean1": mean1, "mean2":mean2, "obs":obs} )
from pymc import MCMC, Matplot
M = MCMC(locals(), db='pickle', dbname='metals.pickle')
iter = 3000; burn = 2000; thin = 10
M.sample(iter=iter, burn=burn, thin=thin)
M.db.commit()
mu1 = np.mean(M.trace('mean1')[:])
mu2 = np.mean(M.trace('mean2')[:])
p = np.mean(M.trace('p')[:])
return p, mu1, 0.1, mu2, 0.1, M
def test_nd(self):
M = MCMC([self.NDstoch()],
db=self.name,
dbname=os.path.join(testdir, 'ND.' + self.name),
dbmode='w')
M.sample(10, progress_bar=0)
a = M.trace('nd')[:]
assert_equal(a.shape, (10, 2, 2))
db = getattr(pymc.database,
self.name).load(os.path.join(testdir, 'ND.' + self.name))
assert_equal(db.trace('nd')[:], a)
def test_zcompression(self):
with warnings.catch_warnings():
warnings.simplefilter('ignore')
db = pymc.database.hdf5.Database(dbname=os.path.join(testdir, 'disaster_modelCompressed.hdf5'),
dbmode='w',
dbcomplevel=5)
S = MCMC(disaster_model, db=db)
S.sample(45,10,1, progress_bar=0)
assert_array_equal(S.trace('early_mean')[:].shape, (35,))
S.db.close()
db.close()
del S
def estimate_failures_from_counts(counts, #samples from noisy labelers
n_samples=10000, #number of samples to run MCMC for
burn=None, #burn-in. Defaults to n_samples/2
thin=10, #thinning rate. Sample every k samples from markov chain
alpha_p=1, beta_p=1, #beta parameters for true positive rate
alpha_e=1, beta_e=10 #beta parameters for noise rates
):
if burn is None:
burn = n_samples / 2
S = counts.sum()
N = len(counts.shape)
p_label = Beta('p_label', alpha=alpha_p, beta=beta_p) #prior on true label
e_pos = Beta('e_pos', alpha_e, beta_e, size=N) # error rate if label = 1
e_neg = Beta('e_neg', alpha_e, beta_e, size=N) # error rate if label = 0
print counts
@deterministic(plot=False)
def patterns(p_label=p_label, e_pos=e_pos, e_neg=e_neg):
#probability that the noisy labelers output pattern p
P = np.zeros((2,)*N)
for pat in itertools.product([0,1], repeat=N):
P[pat] = p_label*np.product([1-e_pos[i] if pat[i]==1 else e_pos[i] for i in xrange(N)])
P[pat] += (1-p_label)*np.product([e_neg[i] if pat[i]==1 else 1-e_neg[i] for i in xrange(N)])
assert np.abs(P.sum() - 1) < 1e-6
return P.ravel()
pattern_counts = Multinomial('pattern_counts',n=S, p=patterns, value=counts.ravel(), observed=True)
variables = [p_label, e_pos, e_neg, patterns]
model = MCMC(variables, verbose=3)
model.sample(iter=n_samples, burn=burn, thin=thin)
model.write_csv('out.csv', ['p_label', 'e_pos', 'e_neg'])
p = np.median(model.trace('p_label')[:])
e_pos = np.median(model.trace('e_pos')[:],0)
e_neg = np.median(model.trace('e_neg')[:],0)
return p, e_pos, e_neg
def differenceOfmeans(humanMean=4.5, sampleSize=50, variance=0.2):
#note that tau is not sigma
#sigma^2=1/tau
t = 1 / variance
#what is the probability that an analyst would give this image the same rating?
mu = TruncatedNormal('mu', mu=humanMean, tau=t, a=1,
b=10) #hypothetical ground truth
botOutput = TruncatedNormal('botOutput', mu=mu, tau=t, a=1, b=10)
humanOutput = TruncatedNormal('humanOutput', mu=mu, tau=t, a=1, b=10)
#when we have data from the model we can use this here
#like this d = pymc.Binomial(‘d’, n=n, p=theta, value=np.array([0.,1.,3.,5.]), observed=True)
sim = MCMC([mu, botOutput, humanOutput])
sim.sample(sampleSize, 0, 1)
botOutput = sim.trace("botOutput")[:]
#if humans only give ratings at the 0.5 interval, not smaller
# humanOutput = round_to_half(sim.trace("humanOutput")[:])
humanOutput = sim.trace("humanOutput")[:]
#difference of the means
#but what we care about is the mean of the human output for each image.
difference = botOutput - humanOutput.mean()
return difference
def imputeBayesian(row, dist):
out = sys.stdout #Save the stdout path for later, we're going to need it
f = open('/dev/null', 'w') #were going to use this to redirect stdout
# filling nan with 0 so everything works
row.fillna(0, inplace=True)
# Masked Values
maskedValues = np.ma.masked_equal(row.values, value=0)
# Choose between distributions, either normal or Poisson.
if dist == "Normal":
# Calculate tau
if np.std(maskedValues) == 0:
tau = np.square(1 / (np.mean(maskedValues) / 3))
else:
tau = np.square((1 / (np.std(maskedValues))))
# Uses only mean
x = Impute('x',
Normal,
maskedValues,
tau=tau,
mu=np.mean(maskedValues))
# For Poisson
elif dist == "Poisson":
x = Impute('x', Poisson, maskedValues, mu=np.mean(maskedValues))
# Fancy test
sys.stdout = f # Skipin stdout
m = MCMC(x)
m.sample(iter=1, burn=0, thin=1)
sys.stdout = out # coming back
# Getting list of missing values
missing = [i for i in range(len(row.values)) if row.values[i] == 0]
# Getting the imputed values from the model
for i in range(len(missing)):
keyString = "x[" + str(missing[i]) + "]"
imputedValue = m.trace(keyString)[:]
row.iloc[missing[i]] = imputedValue[0]
# Returning to use nans
row.replace(0, np.nan, inplace=True)
return row
def test_zcompression(self):
original_filters = warnings.filters[:]
warnings.simplefilter("ignore")
try:
db = pymc.database.hdf5.Database(dbname=os.path.join(testdir, 'disaster_modelCompressed.hdf5'),
dbmode='w',
dbcomplevel=5)
S = MCMC(disaster_model, db=db)
S.sample(45,10,1, progress_bar=0)
assert_array_equal(S.trace('early_mean')[:].shape, (35,))
S.db.close()
db.close()
del S
finally:
warnings.filters = original_filters
def test_zcompression(self):
original_filters = warnings.filters[:]
warnings.simplefilter("ignore")
try:
db = pymc.database.hdf5.Database(dbname=os.path.join(
testdir, 'disaster_modelCompressed.hdf5'),
dbmode='w',
dbcomplevel=5)
S = MCMC(disaster_model, db=db)
S.sample(45, 10, 1, progress_bar=0)
assert_array_equal(S.trace('early_mean')[:].shape, (35, ))
S.db.close()
db.close()
del S
finally:
warnings.filters = original_filters
def fit_std_curve_by_pymc(i_vals, i_sds, dpx_concs):
import pymc
from pymc import Uniform, stochastic, deterministic, MCMC
from pymc import Matplot
# Define prior distributions for both Ka and Kd
ka = Uniform('ka', lower=0, upper=1000)
kd = Uniform('kd', lower=0, upper=1000)
@stochastic(plot=True, observed=True)
def quenching_model(ka=ka, kd=kd, value=i_vals):
pred_i = quenching_func(ka, kd, dpx_concs)
# The first concentration in dpx_concs should always be zero
# (that is, the first point in the titration should be the
# unquenched fluorescence), so we assert that here:
assert dpx_concs[0] == 0
# The reason this is necessary is that in the likelihood calculation
# we skip the error for the first point, since (when the std. err
# is calculated by well) the error is 0 (the I / I_0 ratio is
# always 1 for each well, the the variance/SD across the wells is 0).
# If we don't skip this first point, we get nan for the likelihood.
# In addition, the model always predicts 1 for the I / I_0 ratio
# when the DPX concentration is 0, so it contributes nothing to
# the overall fit.
return -np.sum((value[1:] - pred_i[1:])**2 / (2 * i_sds[1:]**2))
pymc_model = pymc.Model([ka, kd, quenching_model])
mcmc = MCMC(pymc_model)
mcmc.sample(iter=155000, burn=5000, thin=150)
Matplot.plot(mcmc)
plt.figure()
num_to_plot = 1000
ka_vals = mcmc.trace('ka')[:]
kd_vals = mcmc.trace('kd')[:]
if num_to_plot > len(ka_vals):
num_to_plot = len(ka_vals)
for i in range(num_to_plot):
plt.plot(dpx_concs, quenching_func(ka_vals[i], kd_vals[i], dpx_concs),
alpha=0.01, color='r')
plt.errorbar(dpx_concs, i_vals, yerr=i_sds, linestyle='', marker='o',
color='k', linewidth=2)
return (ka_vals, kd_vals)
def main():
s1 = PoissonStudent("arnaud", 1)
s2 = PoissonStudent("francois", 1)
s3 = PoissonStudent("david", 0.5)
students = [s1, s2, s3]
env = Environment(students)
statements = env.simulate(1000, verbose=True)
student_names = set(s['actor'] for s in statements)
lam = Uniform('lam', lower=0, upper=1)
students = [PoissonStudent(name=name, lam=lam) for name in student_names]
env = Environment(students, statements)
params = [lam]
for s in students:
params.extend(s.params)
m = MCMC(params)
m.sample(iter=10000, burn=1000, thin=10)
hist(m.trace('lambda_david')[:])
show()
def Outliers_Krough(self):
fit_dict = OrderedDict()
fit_dict['methodology'] = r'Outliers Krough'
#Initial Guess for fitting
Bces_guess = self.bces_regression()
m_0, n_0 = Bces_guess['m'][0], Bces_guess['n'][0]
Spread_vector = ones(len(self.x_array))
#Model for outliers detection
Outliers_dect_dict = self.inference_outliers(self.x_array, self.y_array, m_0, n_0, Spread_vector)
mcmc = MCMC(Outliers_dect_dict)
mcmc.sample(100000, 20000)
#Extract the data with the outliers coordinates
probability_of_points = mcmc.trace('inlier')[:].astype(float).mean(0)
fit_dict['x_coords_outliers'] = self.x_array[probability_of_points < self.prob_threshold]
fit_dict['y_coords_outliers'] = self.y_array[probability_of_points < self.prob_threshold]
return fit_dict
def detect(
self,
filtered_sig,
fs,
step=2,
iter_count=4000,
burn_count=2000,
):
'''Detect and returns P wave detection results.
Note:
This function returns None when detection fails.
'''
# r_list = self.r_list
raw_sig = filtered_sig
sig_seg = raw_sig
max_hermit_level = 8
p_model = P_model_Gaussian.MakeModel(sig_seg,
max_hermit_level=max_hermit_level)
M = MCMC(p_model)
M.sample(iter=iter_count, burn=burn_count, thin=10)
# retrieve parameters
hermit_coefs = list()
for h_ind in xrange(0, P_model_Gaussian.HermitFunction_max_level):
hermit_value = np.mean(M.trace('hc%d' % h_ind)[:])
hermit_coefs.append(hermit_value)
fitting_curve = np.zeros(len(sig_seg), )
for level, coef in zip(xrange(0, max_hermit_level), hermit_coefs):
fitting_curve += P_model_Gaussian.HermitFunction(
level, len(sig_seg)) * coef
plt.figure(1)
plt.clf()
plt.plot(sig_seg, label='ECG')
plt.plot(fitting_curve, label='fitting curve')
# Hermit coef vis
plt.bar(xrange(0, len(hermit_coefs)), [
0.12,
] * len(hermit_coefs),
width=0.5,
alpha=0.3,
color='grey')
plt.bar(xrange(0, len(hermit_coefs)), [
-0.12,
] * len(hermit_coefs),
width=0.5,
alpha=0.3,
color='grey')
plt.bar(xrange(0, len(hermit_coefs)),
np.array(hermit_coefs) * 0.2,
width=0.5,
color='r')
plt.legend()
plt.grid(True)
plt.show(block=False)
pdb.set_trace()
# plt.savefig('./results/tmp/%d.png' % int(time.time()))
results = dict()
return results
mcmc = MCMC(pymc_model)
mcmc.sample(iter=10000, burn=5000, thin=5)
# Show the pymc histograms and autocorrelation plots
plt.ion()
pymc.Matplot.plot(mcmc)
plt.show()
# Plot the original data along with the sampled trajectories
plt.figure()
plt.plot(tspan, ydata_norm[:, 0], 'r')
plt.plot(tspan, ydata_norm[:, 1], 'g')
plt.plot(tspan, ydata_norm[:, 2], 'b')
num_timecourses = 1000
num_iterations_sampled = mcmc.trace('robertson_model')[:].shape[0]
plt.plot(tspan,
mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:, 0::3].T,
alpha=0.05,
color='r')
plt.plot(tspan,
mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:, 1::3].T,
alpha=0.05,
color='g')
plt.plot(tspan,
mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:, 2::3].T,
alpha=0.05,
value=ydata,
plot=True)
if __name__ == '__main__':
# Build a model
# NOTE: Be careful to avoid namespace clashes with pysb.Model!
pymc_model = pymc.Model([k, decay_model, timecourse])
# Initialize an MCMC object from the model
mcmc = MCMC(pymc_model)
# Sample
mcmc.sample(iter=10000, burn=5000)
# Plot the posterior distribution of the parameter k
plt.ion()
Matplot.plot(mcmc)
# Plot the original data (underlying and noisy)
# along with the sampled trajectories
plt.figure()
plt.plot(tspan, ysim, color='r')
plt.plot(tspan, ydata, color='g')
num_timecourses = 1000
num_iterations_sampled = mcmc.trace('decay_model')[:].shape[0]
plt.plot(tspan,
mcmc.trace('decay_model')[num_iterations_sampled -
num_timecourses:, :].T,
alpha=0.05,
color='b')
class bayes_plotter():
def __init__(self):
self.Fig = None
self.Axis = None
self.Valid_Traces = None
self.pymc_database = None
self.dbMCMC = None
self.Traces_filter = None
self.pymc_stats_keys = ['mean', '95% HPD interval', 'standard deviation', 'mc error', 'quantiles', 'n']
def load_pymc_database(self, Database_address):
#In case the database is open from a previous use
if self.pymc_database != None:
self.pymc_database.close()
#Load the pymc output textfile database
self.pymc_database = database.pickle.load(Database_address)
#Create a dictionary with the bases to
self.Traces_dict = {}
self.traces_list = self.pymc_database.trace_names[0] #This variable contains all the traces from the MCMC (stochastic and deterministic)
for trace in self.traces_list:
self.Traces_dict[trace] = self.pymc_database.trace(trace)
#Generate a MCMC object to recover all the data from the run
self.dbMCMC = MCMC(self.Traces_dict, self.pymc_database)
return
def extract_traces_statistics(self, traces_list = None):
# traces_yplus = bp.pymc_database.trace('He_abud')[:]
# print 'The y_plus trace evolution\n'
# print 'Mean inf', statistics_dict['He_abud']['mean']
# print 'Median numpy', median(traces_yplus)
# print 'Mean numpy', mean(traces_yplus), '\n'
#
# print 'percentiles: 25, 50, 75'
# print percentile(traces_yplus,25), percentile(traces_yplus,50), percentile(traces_yplus,75),'\n'
# print 'percentiles: 16, 84'
# print percentile(traces_yplus,16), percentile(traces_yplus,84),'\n'
# print 'percentiles: 37.73, 68.27'
# print percentile(traces_yplus,37.73), percentile(traces_yplus,68.27),'\n'
# print 'Standard deviation'
# print percentile(traces_yplus,4.55), percentile(traces_yplus,95.45)
# print 'HUD 95', statistics_dict['He_abud']['95% HPD interval'],'\n'
#
# print 'PYMC std', statistics_dict['He_abud']['standard deviation']
# print 'Numpy std', std(traces_yplus), '\n'
self.statistics_dict = OrderedDict()
#If no list input we extract all the traces from the analysis
if traces_list == None:
traces_list = self.traces_list
for trace in traces_list:
self.statistics_dict[trace] = OrderedDict()
for stat in self.pymc_stats_keys:
self.statistics_dict[trace][stat] = self.dbMCMC.trace(trace).stats()[stat]
Trace_array = self.pymc_database.trace(trace)[:]
self.statistics_dict[trace]['16th_p'] = percentile(Trace_array, 16)
self.statistics_dict[trace]['84th_p'] = percentile(Trace_array, 84)
return self.statistics_dict
def close_database(self):
self.pymc_database.close()
self.pymc_database = None
return
def Import_FigConf(self, Fig = None, Axis = None):
if Fig != None:
self.Fig = Fig
if Axis != None:
self.Axis = Axis
def FigConf(self, Figtype = 'Single', FigWidth = 16, FigHeight = 9, AxisFormat = 111, fontsize = 8, PlotStyle = 'Night', n_columns = None, n_rows = None, n_colors = None, color_map = 'colorblind'):
self.Triangle_Saver = False
if Figtype == 'Single':
self.Fig = plt.figure(figsize = (FigWidth, FigHeight))
self.Axis1 = self.Fig.add_subplot(AxisFormat)
#fig.subplots_adjust(hspace = .5, wspace=.001)
elif Figtype == 'Posteriors':
self.Fig = plt.figure(figsize = (FigWidth, FigHeight))
AxisFormat = int(str(n_colors) + '11')
self.Axis1 = self.Fig.add_subplot(AxisFormat)
elif Figtype == 'Grid':
self.Fig, self.Axis1 = plt.subplots(n_rows, n_columns, figsize=(FigWidth, FigHeight))
self.Axis1 = self.Axis1.ravel()
elif Figtype == 'triangle':
self.Triangle_Saver = True
return
rc('legend', fontsize=fontsize + 3, handlelength=3, frameon = True)
rc('axes', titlesize=fontsize+5)
rc('axes', labelsize=fontsize+5)
rc('xtick', labelsize=fontsize+2)
rc('ytick', labelsize=fontsize+2)
rc('text', usetex=True)
rc('font', size=fontsize, style = 'normal', variant='normal', stretch='normal', weight='normal')
# params = {'backend': 'wxAgg', 'lines.markersize' : 2, 'axes.labelsize': fontlabel_size, 'text.fontsize': fontlabel_size, 'legend.fontsize': fontlabel_size, 'xtick.labelsize': tick_size, 'ytick.labelsize': tick_size, 'text.usetex': True, 'figure.figsize': fig_size}
# plt.rcParams.update(params)
self.define_ColorVector(PlotStyle, n_colors, color_map)
return
def legend_conf(self, Axis, loc = 'best', fontize = None, edgelabel = False):
#WARNING: THIS DOES NOT WORK WITH LEGEND RAVELIN
if self.Axis1.get_legend_handles_labels()[1] != None:
Old_Handles, Old_Labels = Axis.get_legend_handles_labels()
Handles_by_Label = OrderedDict(zip(Old_Labels, Old_Handles))
Hl = zip(Handles_by_Label.values(), Handles_by_Label.keys())
New_Handles, New_labels = zip(*Hl)
myLegend = Axis.legend(New_Handles, New_labels, loc=loc, prop={'size':12}, scatterpoints=1, numpoints=1)
if fontize != None:
Leg_Frame = myLegend.get_frame()
Leg_Frame.set_facecolor(self.Color_Vector[0])
Leg_Frame.set_edgecolor(self.Color_Vector[1])
for label in myLegend.get_texts():
label.set_fontsize('large')
for label in myLegend.get_lines():
label.set_linewidth(1.5)
for text in myLegend.get_texts():
text.set_color(self.Color_Vector[1])
if edgelabel:
Leg_Frame = myLegend.get_frame()
Leg_Frame.set_edgecolor('black')
return
def define_ColorVector(self, PlotStyle, n_colors, color_map):
self.ColorVector = [None, None, None]
self.ColorVector[0] = 'w'
self.ColorVector[1] = 'b'
if n_colors == None:
self.ColorVector[2] = cycle(sb.color_palette(color_map))
else:
self.ColorVector[2] = sb.color_palette(color_map, n_colors)
def Compute_SigmaLevel(self, trace1, trace2, nbins=20):
# From a set of traces, bin by number of standard deviations
L, xbins, ybins = histogram2d(trace1, trace2, nbins)
L[L == 0] = 1E-16
logL = nplog(L)
shape = L.shape
L = L.ravel()
#Obtain the indices to sort and unsort the flattened array
i_sort = argsort(L)[::-1]
i_unsort = argsort(i_sort)
L_cumsum = L[i_sort].cumsum()
L_cumsum /= L_cumsum[-1]
xbins = 0.5 * (xbins[1:] + xbins[:-1])
ybins = 0.5 * (ybins[1:] + ybins[:-1])
return xbins, ybins, L_cumsum[i_unsort].reshape(shape)
def plot_SigmaLevels_MCMC(self, xdata, ydata, trace_x, trace_y, plot_Scatter = True, **kwargs):
#"""Plot traces and contours"""
xbins, ybins, sigma = self.Compute_SigmaLevel(trace_x, trace_y)
self.Axis.contour(xbins, ybins, sigma.T, levels=[0.683, 0.955], **kwargs)
if plot_Scatter:
self.Axis.plot(trace_x, trace_y, ',k', alpha=0.1)
def plot_posteriors_histagram(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype = 'Posteriors', n_colors = n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
HDP_coords = self.statistics_dict[Trace]['95% HPD interval']
for HDP in HDP_coords:
Axis.axvline(x = HDP, label = 'HPD interval: ' + round_sig(HDP_coords[0], 4) + ' - ' + round_sig(HDP_coords[1], 4), color='grey', linestyle = 'dashed')
Axis.axvline(x = self.statistics_dict[Trace]['mean'], label = 'Mean value: ' + round_sig(self.statistics_dict[Trace]['mean'], 4), color='grey', linestyle = 'solid')
Axis.hist(self.Traces_dict[Trace][:], histtype='stepfilled', bins=35, alpha=.7, color=self.ColorVector[2][i], normed=False)
Axis.set_ylabel(labels[i],fontsize=20)
self.legend_conf(Axis, loc='best', edgelabel=True)
# Axis.yaxis.set_ticks(arange(0, 250, 50))
def plot_Ownposteriors_histagram(self, Traces, labels, sigfig_n = 4, xlim = None, ylim = None):
n_traces = len(Traces)
self.FigConf(Figtype = 'Posteriors', n_colors = n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
HDP_coords = [percentile(Trace, 16), percentile(Trace, 84)]
mean_value = median(Trace)
for HDP in HDP_coords:
Axis.axvline(x = HDP, label = 'Percentiles: 16th-84th: ' + round_sig(HDP_coords[0], n=sigfig_n, scien_notation=False) + ' - ' + round_sig(HDP_coords[1], n=sigfig_n, scien_notation=False), color='grey', linestyle = 'dashed')
Median_text_legend = r'Median value: $' + round_sig(mean_value, n=sigfig_n, scien_notation=False) + '_{-' + round_sig(mean_value - HDP_coords[0], n=sigfig_n, scien_notation=False) + '}^{+' + round_sig(HDP_coords[1] - mean_value, n=sigfig_n, scien_notation=False) + '}$'
Axis.axvline(x = mean_value, label = Median_text_legend, color='grey', linestyle = 'solid')
Axis.hist(Trace, histtype='stepfilled', bins=35, alpha=.7, color=self.ColorVector[2][i], normed=False)
Axis.set_ylabel(labels[i],fontsize=20)
self.legend_conf(Axis, loc='best', edgelabel=True)
# Axis.yaxis.set_ticks(arange(0, 250, 50))
if xlim != None:
Axis.set_xlim(xlim[0], xlim[1])
if ylim != None:
Axis.set_ylim(ylim[0], ylim[1])
return
def plot_tracers(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype = 'Posteriors', n_colors = n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
Variable_value = self.statistics_dict[Trace]['mean']
Variable_error = self.statistics_dict[Trace]['standard deviation']
label = labels[i] + ': ' + round_sig(Variable_value, 4) + r'$\pm$' + round_sig(Variable_error,4)
Axis.plot(self.pymc_database.trace(Trace)[:], label = label, color=self.ColorVector[2][i])
Axis.axhline(y = self.statistics_dict[Trace]['mean'], color=self.ColorVector[2][i], linestyle = '--' )
Axis.set_ylabel(labels[i],fontsize=20)
self.legend_conf(Axis, loc=1, edgelabel=True)
plt.locator_params(axis = 'y', nbins = 5)
def plot_acorrelation(self, Traces, labels, n_columns=4, n_rows=2):
n_traces = len(Traces)
self.FigConf(Figtype = 'Grid', n_colors = n_traces, n_columns=n_columns, n_rows=n_rows, FigHeight=9, FigWidth=16)
for i in range(len(Traces)):
Trace = Traces[i]
maxlags = min(len(self.pymc_database.trace(Trace)[:]) - 1, 100)
label = labels[i]
if Trace != 'ChiSq':
self.Axis1[i].acorr(x = self.pymc_database.trace(Trace)[:], color=self.ColorVector[2][i], detrend= detrend_mean, maxlags=maxlags)
else:
#Apano momentaneo
chisq_adapted = reshape(self.pymc_database.trace(Trace)[:], len(self.pymc_database.trace(Trace)[:]))
maxlags = min(len(chisq_adapted) - 1, 100)
self.Axis1[i].acorr(x = chisq_adapted, color=self.ColorVector[2][i], detrend= detrend_mean, maxlags=maxlags)
self.Axis1[i].set_xlim(0, maxlags)
self.Axis1[i].set_title(label)
return
def plot_chiSq_Behaviour(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype = 'Grid', n_colors = n_traces, n_columns=4, n_rows=2, FigHeight=9, FigWidth=16)
chisq_adapted = reshape(self.pymc_database.trace('ChiSq')[:], len(self.pymc_database.trace('ChiSq')[:])) * -2
y_lim = 30
min_chi_index = argmin(chisq_adapted)
for i in range(len(Traces)):
Trace = Traces[i]
label = labels[i]
if Trace != 'ChiSq':
self.Axis1[i].scatter(x = self.pymc_database.trace(Trace)[:], y = chisq_adapted, color=self.ColorVector[2][i])
x_min = npmin(self.pymc_database.trace(Trace)[:])
x_max = npmax(self.pymc_database.trace(Trace)[:])
self.Axis1[i].axvline(x = self.statistics_dict[Trace]['mean'], label = 'Inference value: ' + round_sig(self.statistics_dict[Trace]['mean'], 4,scien_notation=False), color='grey', linestyle = 'solid')
self.Axis1[i].scatter(self.pymc_database.trace(Trace)[:][min_chi_index], chisq_adapted[min_chi_index], color='Black', label = r'$\chi^{2}_{min}$ value: ' + round_sig(self.pymc_database.trace(Trace)[:][min_chi_index],4,scien_notation=False))
self.Axis1[i].set_ylabel(r'$\chi^{2}$',fontsize=20)
self.Axis1[i].set_ylim(0, y_lim)
self.Axis1[i].set_xlim(x_min, x_max)
self.Axis1[i].set_title(label,fontsize=20)
legend_i = self.Axis1[i].legend(loc='best', fontsize='x-large')
legend_i.get_frame().set_facecolor('white')
def plot_triangle_histContours(self, Traces, labels, true_values = None):
n_traces = len(Traces)
self.FigConf(Figtype = 'triangle')
#Make plots
List_Arrays = []
for i in range(n_traces):
List_Arrays.append(self.pymc_database.trace(Traces[i])[:])
Samples = array(List_Arrays).T
#Make
if true_values != None:
self.figure = corner.corner(Samples[:,:], labels=labels, quantiles=[0.16, 0.5, 0.84], show_titles=True, title_args={"fontsize": 100}, truths = true_values, title_fmt='0.3f')
else:
self.figure = corner.corner(Samples[:,:], labels=labels, quantiles=[0.16, 0.5, 0.84], show_titles=True, title_args={"fontsize": 100}, title_fmt='0.3f')
def savefig(self, output_address, extension = '.png', reset_fig = True):
if self.Triangle_Saver:
self.figure.savefig(output_address + extension, dpi=500, bbox_inches='tight', pad_inches=0.2)
else:
plt.tight_layout()
plt.savefig(output_address + extension, dpi=500, facecolor=self.ColorVector[0], bbox_inches='tight', pad_inches=0.2)
if reset_fig:
self.reset_fig()
return
def reset_fig(self):
plt.cla()
return
# def GetLower_ChiSquare(MCMC_Database, variable, mean = None, min_value = None, max_value = None, nbins = 100):
#
# print 'Treating variable', variable
#
#
# ChiArray = Database_MCMC.trace('ChiSq')[:] * -1
# VariableArray = Database_MCMC.trace(variable)[:]
#
# if mean == None:
# mean = average(VariableArray)
#
# if min_value == None:
# min_value = 0.8
#
# if max_value == None:
# max_value = 1.2
#
# Bins = linspace(mean*min_value, mean*max_value, nbins)
# Points_Index = digitize(VariableArray, Bins)
#
# Unique_Bins = unique(Points_Index)
# Min_Index, Max_Index = min(Unique_Bins), max(Unique_Bins)
#
# Min_values_Chi = zeros(len(Points_Index))
# Min_values_Variable = zeros(len(Points_Index))
#
# for i in range(Min_Index, Max_Index):
# inBinIndex = where(Points_Index == i)[0]
#
# if len(ChiArray[inBinIndex]) != 0:
# Min_values_Chi[i] = np_min(ChiArray[inBinIndex])
# Min_values_Variable[i] = Bins[i]
#
# return Min_values_Variable, Min_values_Chi, mean
Ibetas = np.empty((Ni,int((iters-burns)/thins)))
Iig = np.empty((Ni,int((iters-burns)/thins)))
Iil = np.empty((Ni,int((iters-burns)/thins)))
Iia = np.empty((Ni,int((iters-burns)/thins)))
Iiw = np.empty((Ni,int((iters-burns)/thins)))
Iae = np.empty((Ni,int((iters-burns)/thins)))
for i in range(0, 1):
print('-------------')
print('Processing class ' + str(i+1) + ' out of ' + str(Ni))
print('-------------')
np.save('terribleHackClass.npy',np.array([i]))
imp.reload(decayModelAlign)
M = MCMC(decayModelAlign)
M.sample(iter=iters, burn=burns, thin=thins,verbose=0)
Irhos[i,:]=M.trace('rho_s')[:]
Ialphas[i,:]=M.trace('alpha')[:]
Ibetas[i,:]=M.trace('beta')[:]
Iig[i,:]=M.trace('ignore_length')[:]
Iil[i,:]=M.trace('attract_length')[:]
Iia[i,:]=M.trace('attract_angle')[:]
Iiw[i,:]=M.trace('align_weight')[:]
Iae[i,:]=M.trace('attract_exponent')[:]
np.save('Irhos0.npy',Irhos)
np.save('Ialphas0.npy',Ialphas)
np.save('Ibetas0.npy',Ibetas)
np.save('Iig0.npy',Iig)
np.save('Iil0.npy',Iil)
np.save('Iia0.npy',Iia)
np.save('Iiw0.npy',Iiw)
# Define data and stochastics
switchpoint = DiscreteUniform(
'switchpoint',
lower=0,
upper=110,
doc='Switchpoint[year]')
early_mean = Exponential('early_mean', beta=1.)
late_mean = Exponential('late_mean', beta=1.)
@deterministic(plot=False)
def rate(s=switchpoint, e=early_mean, l=late_mean):
''' Concatenate Poisson means '''
out = empty(len(disasters_array))
out[:s] = e
out[s:] = l
return out
disasters = Poisson('disasters', mu=rate, value=disasters_array, observed=True)
# import disaster_model
from pymc import MCMC
# M = MCMC(disaster_model)
M = MCMC([switchpoint,early_mean,late_mean,rate,disasters])
M.sample(iter=10000, burn=1000, thin=10)
print switchpoint.value
print rate.value
print M.trace('switchpoint')[:]
# from pymc.Matplot import plot
# plot(M)
class bayes_plotter():
def __init__(self):
self.Fig = None
self.Axis = None
self.Valid_Traces = None
self.pymc_database = None
self.dbMCMC = None
self.Traces_filter = None
self.pymc_stats_keys = [
'mean', '95% HPD interval', 'standard deviation', 'mc error',
'quantiles', 'n'
]
def load_pymc_database(self, Database_address):
#In case the database is open from a previous use
if self.pymc_database != None:
self.pymc_database.close()
#Load the pymc output textfile database
self.pymc_database = database.pickle.load(Database_address)
#Create a dictionary with the bases to
self.Traces_dict = {}
self.traces_list = self.pymc_database.trace_names[
0] #This variable contains all the traces from the MCMC (stochastic and deterministic)
for trace in self.traces_list:
self.Traces_dict[trace] = self.pymc_database.trace(trace)
#Generate a MCMC object to recover all the data from the run
self.dbMCMC = MCMC(self.Traces_dict, self.pymc_database)
return
def extract_traces_statistics(self, traces_list=None):
# traces_yplus = bp.pymc_database.trace('He_abud')[:]
# print 'The y_plus trace evolution\n'
# print 'Mean inf', statistics_dict['He_abud']['mean']
# print 'Median numpy', median(traces_yplus)
# print 'Mean numpy', mean(traces_yplus), '\n'
#
# print 'percentiles: 25, 50, 75'
# print percentile(traces_yplus,25), percentile(traces_yplus,50), percentile(traces_yplus,75),'\n'
# print 'percentiles: 16, 84'
# print percentile(traces_yplus,16), percentile(traces_yplus,84),'\n'
# print 'percentiles: 37.73, 68.27'
# print percentile(traces_yplus,37.73), percentile(traces_yplus,68.27),'\n'
# print 'Standard deviation'
# print percentile(traces_yplus,4.55), percentile(traces_yplus,95.45)
# print 'HUD 95', statistics_dict['He_abud']['95% HPD interval'],'\n'
#
# print 'PYMC std', statistics_dict['He_abud']['standard deviation']
# print 'Numpy std', std(traces_yplus), '\n'
self.statistics_dict = OrderedDict()
#If no list input we extract all the traces from the analysis
if traces_list == None:
traces_list = self.traces_list
for trace in traces_list:
self.statistics_dict[trace] = OrderedDict()
for stat in self.pymc_stats_keys:
self.statistics_dict[trace][stat] = self.dbMCMC.trace(
trace).stats()[stat]
Trace_array = self.pymc_database.trace(trace)[:]
self.statistics_dict[trace]['16th_p'] = percentile(Trace_array, 16)
self.statistics_dict[trace]['84th_p'] = percentile(Trace_array, 84)
return self.statistics_dict
def close_database(self):
self.pymc_database.close()
self.pymc_database = None
return
def Import_FigConf(self, Fig=None, Axis=None):
if Fig != None:
self.Fig = Fig
if Axis != None:
self.Axis = Axis
def FigConf(self,
Figtype='Single',
FigWidth=16,
FigHeight=9,
AxisFormat=111,
fontsize=8,
PlotStyle='Night',
n_columns=None,
n_rows=None,
n_colors=None,
color_map='colorblind'):
self.Triangle_Saver = False
if Figtype == 'Single':
self.Fig = plt.figure(figsize=(FigWidth, FigHeight))
self.Axis1 = self.Fig.add_subplot(AxisFormat)
#fig.subplots_adjust(hspace = .5, wspace=.001)
elif Figtype == 'Posteriors':
self.Fig = plt.figure(figsize=(FigWidth, FigHeight))
AxisFormat = int(str(n_colors) + '11')
self.Axis1 = self.Fig.add_subplot(AxisFormat)
elif Figtype == 'Grid':
self.Fig, self.Axis1 = plt.subplots(n_rows,
n_columns,
figsize=(FigWidth, FigHeight))
self.Axis1 = self.Axis1.ravel()
elif Figtype == 'triangle':
self.Triangle_Saver = True
return
rc('legend', fontsize=fontsize + 3, handlelength=3, frameon=True)
rc('axes', titlesize=fontsize + 5)
rc('axes', labelsize=fontsize + 5)
rc('xtick', labelsize=fontsize + 2)
rc('ytick', labelsize=fontsize + 2)
rc('text', usetex=True)
rc('font',
size=fontsize,
style='normal',
variant='normal',
stretch='normal',
weight='normal')
# params = {'backend': 'wxAgg', 'lines.markersize' : 2, 'axes.labelsize': fontlabel_size, 'text.fontsize': fontlabel_size, 'legend.fontsize': fontlabel_size, 'xtick.labelsize': tick_size, 'ytick.labelsize': tick_size, 'text.usetex': True, 'figure.figsize': fig_size}
# plt.rcParams.update(params)
self.define_ColorVector(PlotStyle, n_colors, color_map)
return
def legend_conf(self, Axis, loc='best', fontize=None, edgelabel=False):
#WARNING: THIS DOES NOT WORK WITH LEGEND RAVELIN
if self.Axis1.get_legend_handles_labels()[1] != None:
Old_Handles, Old_Labels = Axis.get_legend_handles_labels()
Handles_by_Label = OrderedDict(zip(Old_Labels, Old_Handles))
Hl = zip(Handles_by_Label.values(), Handles_by_Label.keys())
New_Handles, New_labels = zip(*Hl)
myLegend = Axis.legend(New_Handles,
New_labels,
loc=loc,
prop={'size': 12},
scatterpoints=1,
numpoints=1)
if fontize != None:
Leg_Frame = myLegend.get_frame()
Leg_Frame.set_facecolor(self.Color_Vector[0])
Leg_Frame.set_edgecolor(self.Color_Vector[1])
for label in myLegend.get_texts():
label.set_fontsize('large')
for label in myLegend.get_lines():
label.set_linewidth(1.5)
for text in myLegend.get_texts():
text.set_color(self.Color_Vector[1])
if edgelabel:
Leg_Frame = myLegend.get_frame()
Leg_Frame.set_edgecolor('black')
return
def define_ColorVector(self, PlotStyle, n_colors, color_map):
self.ColorVector = [None, None, None]
self.ColorVector[0] = 'w'
self.ColorVector[1] = 'b'
if n_colors == None:
self.ColorVector[2] = cycle(sb.color_palette(color_map))
else:
self.ColorVector[2] = sb.color_palette(color_map, n_colors)
def Compute_SigmaLevel(self, trace1, trace2, nbins=20):
# From a set of traces, bin by number of standard deviations
L, xbins, ybins = histogram2d(trace1, trace2, nbins)
L[L == 0] = 1E-16
logL = nplog(L)
shape = L.shape
L = L.ravel()
#Obtain the indices to sort and unsort the flattened array
i_sort = argsort(L)[::-1]
i_unsort = argsort(i_sort)
L_cumsum = L[i_sort].cumsum()
L_cumsum /= L_cumsum[-1]
xbins = 0.5 * (xbins[1:] + xbins[:-1])
ybins = 0.5 * (ybins[1:] + ybins[:-1])
return xbins, ybins, L_cumsum[i_unsort].reshape(shape)
def plot_SigmaLevels_MCMC(self,
xdata,
ydata,
trace_x,
trace_y,
plot_Scatter=True,
**kwargs):
#"""Plot traces and contours"""
xbins, ybins, sigma = self.Compute_SigmaLevel(trace_x, trace_y)
self.Axis.contour(xbins,
ybins,
sigma.T,
levels=[0.683, 0.955],
**kwargs)
if plot_Scatter:
self.Axis.plot(trace_x, trace_y, ',k', alpha=0.1)
def plot_posteriors_histagram(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype='Posteriors', n_colors=n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
HDP_coords = self.statistics_dict[Trace]['95% HPD interval']
for HDP in HDP_coords:
Axis.axvline(x=HDP,
label='HPD interval: ' +
round_sig(HDP_coords[0], 4) + ' - ' +
round_sig(HDP_coords[1], 4),
color='grey',
linestyle='dashed')
Axis.axvline(x=self.statistics_dict[Trace]['mean'],
label='Mean value: ' +
round_sig(self.statistics_dict[Trace]['mean'], 4),
color='grey',
linestyle='solid')
Axis.hist(self.Traces_dict[Trace][:],
histtype='stepfilled',
bins=35,
alpha=.7,
color=self.ColorVector[2][i],
normed=False)
Axis.set_ylabel(labels[i], fontsize=20)
self.legend_conf(Axis, loc='best', edgelabel=True)
# Axis.yaxis.set_ticks(arange(0, 250, 50))
def plot_Ownposteriors_histagram(self,
Traces,
labels,
sigfig_n=4,
xlim=None,
ylim=None):
n_traces = len(Traces)
self.FigConf(Figtype='Posteriors', n_colors=n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
HDP_coords = [percentile(Trace, 16), percentile(Trace, 84)]
mean_value = median(Trace)
for HDP in HDP_coords:
Axis.axvline(
x=HDP,
label='Percentiles: 16th-84th: ' + round_sig(
HDP_coords[0], n=sigfig_n, scien_notation=False) +
' - ' +
round_sig(HDP_coords[1], n=sigfig_n, scien_notation=False),
color='grey',
linestyle='dashed')
Median_text_legend = r'Median value: $' + round_sig(
mean_value, n=sigfig_n,
scien_notation=False) + '_{-' + round_sig(
mean_value - HDP_coords[0],
n=sigfig_n,
scien_notation=False) + '}^{+' + round_sig(
HDP_coords[1] - mean_value,
n=sigfig_n,
scien_notation=False) + '}$'
Axis.axvline(x=mean_value,
label=Median_text_legend,
color='grey',
linestyle='solid')
Axis.hist(Trace,
histtype='stepfilled',
bins=35,
alpha=.7,
color=self.ColorVector[2][i],
normed=False)
Axis.set_ylabel(labels[i], fontsize=20)
self.legend_conf(Axis, loc='best', edgelabel=True)
# Axis.yaxis.set_ticks(arange(0, 250, 50))
if xlim != None:
Axis.set_xlim(xlim[0], xlim[1])
if ylim != None:
Axis.set_ylim(ylim[0], ylim[1])
return
def plot_tracers(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype='Posteriors', n_colors=n_traces)
for i in range(len(Traces)):
Trace = Traces[i]
Axis_Location = int(str(n_traces) + '1' + str(i + 1))
Axis = plt.subplot(Axis_Location)
Variable_value = self.statistics_dict[Trace]['mean']
Variable_error = self.statistics_dict[Trace]['standard deviation']
label = labels[i] + ': ' + round_sig(
Variable_value, 4) + r'$\pm$' + round_sig(Variable_error, 4)
Axis.plot(self.pymc_database.trace(Trace)[:],
label=label,
color=self.ColorVector[2][i])
Axis.axhline(y=self.statistics_dict[Trace]['mean'],
color=self.ColorVector[2][i],
linestyle='--')
Axis.set_ylabel(labels[i], fontsize=20)
self.legend_conf(Axis, loc=1, edgelabel=True)
plt.locator_params(axis='y', nbins=5)
def plot_acorrelation(self, Traces, labels, n_columns=4, n_rows=2):
n_traces = len(Traces)
self.FigConf(Figtype='Grid',
n_colors=n_traces,
n_columns=n_columns,
n_rows=n_rows,
FigHeight=9,
FigWidth=16)
for i in range(len(Traces)):
Trace = Traces[i]
maxlags = min(len(self.pymc_database.trace(Trace)[:]) - 1, 100)
label = labels[i]
if Trace != 'ChiSq':
self.Axis1[i].acorr(x=self.pymc_database.trace(Trace)[:],
color=self.ColorVector[2][i],
detrend=detrend_mean,
maxlags=maxlags)
else:
#Apano momentaneo
chisq_adapted = reshape(
self.pymc_database.trace(Trace)[:],
len(self.pymc_database.trace(Trace)[:]))
maxlags = min(len(chisq_adapted) - 1, 100)
self.Axis1[i].acorr(x=chisq_adapted,
color=self.ColorVector[2][i],
detrend=detrend_mean,
maxlags=maxlags)
self.Axis1[i].set_xlim(0, maxlags)
self.Axis1[i].set_title(label)
return
def plot_chiSq_Behaviour(self, Traces, labels):
n_traces = len(Traces)
self.FigConf(Figtype='Grid',
n_colors=n_traces,
n_columns=4,
n_rows=2,
FigHeight=9,
FigWidth=16)
chisq_adapted = reshape(
self.pymc_database.trace('ChiSq')[:],
len(self.pymc_database.trace('ChiSq')[:])) * -2
y_lim = 30
min_chi_index = argmin(chisq_adapted)
for i in range(len(Traces)):
Trace = Traces[i]
label = labels[i]
if Trace != 'ChiSq':
self.Axis1[i].scatter(x=self.pymc_database.trace(Trace)[:],
y=chisq_adapted,
color=self.ColorVector[2][i])
x_min = npmin(self.pymc_database.trace(Trace)[:])
x_max = npmax(self.pymc_database.trace(Trace)[:])
self.Axis1[i].axvline(
x=self.statistics_dict[Trace]['mean'],
label='Inference value: ' +
round_sig(self.statistics_dict[Trace]['mean'],
4,
scien_notation=False),
color='grey',
linestyle='solid')
self.Axis1[i].scatter(
self.pymc_database.trace(Trace)[:][min_chi_index],
chisq_adapted[min_chi_index],
color='Black',
label=r'$\chi^{2}_{min}$ value: ' + round_sig(
self.pymc_database.trace(Trace)[:][min_chi_index],
4,
scien_notation=False))
self.Axis1[i].set_ylabel(r'$\chi^{2}$', fontsize=20)
self.Axis1[i].set_ylim(0, y_lim)
self.Axis1[i].set_xlim(x_min, x_max)
self.Axis1[i].set_title(label, fontsize=20)
legend_i = self.Axis1[i].legend(loc='best', fontsize='x-large')
legend_i.get_frame().set_facecolor('white')
def plot_triangle_histContours(self, Traces, labels, true_values=None):
n_traces = len(Traces)
self.FigConf(Figtype='triangle')
#Make plots
List_Arrays = []
for i in range(n_traces):
List_Arrays.append(self.pymc_database.trace(Traces[i])[:])
Samples = array(List_Arrays).T
#Make
if true_values != None:
self.figure = corner.corner(Samples[:, :],
labels=labels,
quantiles=[0.16, 0.5, 0.84],
show_titles=True,
title_args={"fontsize": 100},
truths=true_values,
title_fmt='0.3f')
else:
self.figure = corner.corner(Samples[:, :],
labels=labels,
quantiles=[0.16, 0.5, 0.84],
show_titles=True,
title_args={"fontsize": 100},
title_fmt='0.3f')
def savefig(self, output_address, extension='.png', reset_fig=True):
if self.Triangle_Saver:
self.figure.savefig(output_address + extension,
dpi=500,
bbox_inches='tight',
pad_inches=0.2)
else:
plt.tight_layout()
plt.savefig(output_address + extension,
dpi=500,
facecolor=self.ColorVector[0],
bbox_inches='tight',
pad_inches=0.2)
if reset_fig:
self.reset_fig()
return
def reset_fig(self):
plt.cla()
return
# def GetLower_ChiSquare(MCMC_Database, variable, mean = None, min_value = None, max_value = None, nbins = 100):
#
# print 'Treating variable', variable
#
#
# ChiArray = Database_MCMC.trace('ChiSq')[:] * -1
# VariableArray = Database_MCMC.trace(variable)[:]
#
# if mean == None:
# mean = average(VariableArray)
#
# if min_value == None:
# min_value = 0.8
#
# if max_value == None:
# max_value = 1.2
#
# Bins = linspace(mean*min_value, mean*max_value, nbins)
# Points_Index = digitize(VariableArray, Bins)
#
# Unique_Bins = unique(Points_Index)
# Min_Index, Max_Index = min(Unique_Bins), max(Unique_Bins)
#
# Min_values_Chi = zeros(len(Points_Index))
# Min_values_Variable = zeros(len(Points_Index))
#
# for i in range(Min_Index, Max_Index):
# inBinIndex = where(Points_Index == i)[0]
#
# if len(ChiArray[inBinIndex]) != 0:
# Min_values_Chi[i] = np_min(ChiArray[inBinIndex])
# Min_values_Variable[i] = Bins[i]
#
# return Min_values_Variable, Min_values_Chi, mean
print "frequentist thetas:\n", thetas_freq
# Build the model. We're modelling the tumor rate in each group as a draw from a
# Beta distribution shared across all the groups. The number of tumors in a
# group is then sampled as a Binomial(n, rate)
a = Uniform('a', lower=1, upper=15)
b = Uniform('b', lower=1, upper=15)
thetas = Beta('thetas', alpha=a, beta=b, size=n.size)
y = Binomial('y', n=n, p=thetas, value=tumors, observed=True)
# sample from the model
M = MCMC({'y':y, 'thetas': thetas, 'a':a, 'b':b})
M.sample(iter=30000, burn=10000, thin=10)
# compute posterior estimates
thetas_bayes = M.trace('thetas')[:].mean(axis=0)
a_post = M.trace('a')[:].mean()
b_post = M.trace('b')[:].mean()
print "++++++++++ Mixing spot checks ++++++++++"
print "a.trace:", M.trace('a')[:]
print "theta[4].trace:", M.trace('thetas')[:,4]
print "++++++++++ Posteriors ++++++++++"
print "a posterior:", a_post
print "b posterior:", b_post
print "thetas posterior:\n", thetas_bayes
# plot the quality of the fit to empirical distribution of thetas
plt.title('Theta goodness of fit')
plt.ylabel('density')
#plt.savefig('repulsion_length.png')
#plt.show()
#plt.hist(M.trace('eta')[:])
#plt.xlim(0,1)
#plt.title('autocorrelation')
#plt.savefig('autocorrelation.png')
#plt.show()
#show()
plt.figure()
aa = (M.trace('alpha')[:])
bb = (M.trace('beta')[:])
mv=(1-bb)*(1-aa)
sv=aa
ev=(bb)*(1-aa)
plt.hist(mv,normed=True, label='memory')
plt.hist(sv,normed=True, label='social')
plt.hist(ev,normed=True, label='environment')
plt.legend(loc='upper center')
plt.xlim(0,1)
plt.show()
plt.savefig('heading_weights.png')
plt.figure()
plt.hist((M.trace('rho_s')[:]),normed=True, label='s')
# M.sample(iter=400000, burn=50000, thin=10,verbose=0)
# np.save('mc_data/nm_rho_s.npy',M.trace('rho_s')[:])
# np.save('mc_data/nm_alpha.npy',M.trace('alpha')[:])
# np.save('mc_data/nm_beta.npy',M.trace('beta')[:])
# np.save('mc_data/nm_ia.npy',M.trace('interaction_angle')[:])
# np.save('mc_data/nm_il.npy',M.trace('interaction_length')[:])
# np.save('mc_data/nm_ig.npy',M.trace('ignore_length')[:])
# network model with alignment
M = MCMC(networkModelAlignMC)
M.use_step_method(
pymc.AdaptiveMetropolis,
[
networkModelAlignMC.interaction_angle,
networkModelAlignMC.interaction_length,
networkModelAlignMC.align_weight,
networkModelAlignMC.ignore_length,
],
delay=1000,
)
M.sample(iter=400000, burn=50000, thin=10, verbose=0)
np.save("mc_data/nma_rho_s.npy", M.trace("rho_s")[:])
np.save("mc_data/nma_alpha.npy", M.trace("alpha")[:])
np.save("mc_data/nma_beta.npy", M.trace("beta")[:])
np.save("mc_data/nma_ia.npy", M.trace("interaction_angle")[:])
np.save("mc_data/nma_il.npy", M.trace("interaction_length")[:])
np.save("mc_data/nma_aw.npy", M.trace("align_weight")[:])
np.save("mc_data/nma_ig.npy", M.trace("ignore_length")[:])
iterations = 1000000
burn = 900000
thin = 10
hmod = kq1.generate_model(HISTORICAL)
cmod = kq1.generate_model(CONCURRENT)
H = MCMC(hmod, db="pickle", dbname="historical_model.pickle")
H.sample(iterations, burn, thin=thin, verbose=2)
C = MCMC(cmod, db="pickle", dbname="concurrent_model.pickle")
C.sample(iterations, burn, thin=thin, verbose=2)
conc = np.sum(C.trace("pred")[:], 0)/float((iterations-burn)/thin)
historical = np.sum(H.trace("pred")[:], 0)/float((iterations-burn)/thin)
x = np.arange(200,3200, 200)
colors = ('0.7', 'black')
markers = (False, True)
for i,p in enumerate((70,85)):
plot(x, conc[i*-1][C.crit_pred==1], color=colors[i], marker='^'*markers[i])
plot(x, historical[i*-1][H.crit_pred==1], color=colors[i], marker='o'*markers[i])
plot(x, conc[i*-1][C.crit_pred==0], color=colors[i], marker='^'*markers[i], linestyle="dashed")
plot(x, historical[i*-1][H.crit_pred==0], color=colors[i], marker='o'*markers[i], linestyle="dashed")
xlim(150, 3050)
ylim(0,1)
#!/usr/bin/env python
import two_normal_model
from pymc import MCMC
from pymc.Matplot import plot
# do posterior sampling
m = MCMC(two_normal_model)
m.sample(iter=100000, burn=1000)
print(m.stats())
import numpy
for p in ['mean1', 'mean2', 'std_dev', 'theta']:
numpy.savetxt("%s.trace" % p, m.trace(p)[:])
# draw some pictures
plot(m)
@deterministic(plot=False)
def r(s=s, e=e, l=l):
""" Concatenate Poisson means """
out = np.empty(len(disasters_array))
out[:s] = e
out[s:] = l
return out
from pymc.examples import DisasterModel
from pymc import MCMC
M = MCMC(DisasterModel)
M.isample(iter=10000, burn=1000, thin=10)
M.trace('s')[:]
#array([41, 40, 40, ..., 43, 44, 44])
from pylab import hist, show
hist(M.trace('l')[:])
#(array([ 8, 52, 565, 1624, 2563, 2105, 1292, 488, 258, 45]),
#array([ 0.52721865, 0.60788251, 0.68854637, 0.76921023, 0.84987409,
# 0.93053795, 1.01120181, 1.09186567, 1.17252953, 1.25319339]),
#<a list of 10 Patch objects>)
show()
from pymc.Matplot import plot
plot(M)
x = np.array([
4, 5, 4, 0, 1, 4, 3, 4, 0, 6, 3, 3, 4, 0, 2, 6, 3, 3, 5, 4, 5, 3, 1, 4, 4,
from pymc import MCMC
import numpy as np
from pythonMCMC import pymcCrater
from pymc.Matplot import plot
from pylab import hist, show,draw
M = MCMC(pymcCrater)
M.sample(iter=10000, burn=700, thin=5)
print M.trace('lnlike')[:]
print M.stats()
plot(M)
show()
return sapflow_modeled
'''data likelihoods'''
np.random.seed(1)
Y_obs = Normal('Y_obs', mu=muf, tau=sigma, value=vn, observed=True)
''' posterior sampling '''
M = MCMC([alpha, c, g1, kxmax, Lamp, Lave, LTf, p50, Z, sigma])
M.use_step_method(AdaptiveMetropolis,
[alpha, c, g1, kxmax, Lamp, Lave, LTf, p50, Z, sigma])
M.sample(iter=1000000, burn=500000, thin=40)
# Save trace
ensure_dir(species)
traces = {
'alpha': M.trace('alpha')[:],
'c': M.trace('c')[:],
'g1': M.trace('g1')[:],
'kxmax': M.trace('kxmax')[:],
'Lamp': M.trace('Lamp')[:],
'Lave': M.trace('Lave')[:],
'LTf': M.trace('LTf')[:],
'p50': M.trace('p50')[:],
'Z': M.trace('Z')[:],
'sigma': M.trace('sigma')[:]
}
pickle_out = open("MCMC.pickle", "wb")
pickle.dump(traces, pickle_out)
pickle_out.close()
# Trace
from OOH import tube_model
from pymc import MCMC
from pylab import hist, show, bar, plot
import numpy as np
#from pymc.Matplot import plot
M = MCMC(tube_model)
M.sample(iter=100000, burn=1000, thin=10)
# hist(M.trace("after_mean")[:])
# hist(M.trace("before_mean")[:])
# show()
#plot(M)
#show()
before_mean_samples = M.trace("before_mean")[:]
after_mean_samples = M.trace("after_mean")[:]
start_time_samples = M.trace("start_t")[:]
N = start_time_samples.shape[0]
expected_conversions_per_day = np.zeros(16)
for day in range(0, 16):
ix = day < start_time_samples
expected_conversions_per_day[day] = ((before_mean_samples[ix].sum()) +
(after_mean_samples[~ix].sum())) / N
print(expected_conversions_per_day)
plot(list(range(16)), expected_conversions_per_day)
show()
x_weight = Normal("weight", 0, 1, value=xs, observed=True)
@deterministic(plot=False)
def pred(b00=b00, b01=b01, b10=b10, b11=b11, s=switchpoint):
out = np.empty(len(xs))
breakk = s
out[:breakk] = b00 + b01*xs[:breakk]
out[breakk:] = b10 + b11*xs[breakk:]
return out
y = Normal("y", mu=pred, tau=err, value=ys, observed=True)
model = Model([pred, b00, b01, b10, b11, switchpoint, y, err])
# g = graph.graph(model)
# g.write_png('graph.png')
m = MCMC(model)
m.sample(burn=1000, iter=10000)
bb00 = np.mean(m.trace('b00')[:])
bb01 = np.mean(m.trace('b01')[:])
bb10 = np.mean(m.trace('b10')[:])
bb11 = np.mean(m.trace('b11')[:])
switch = mode(m.trace('switch')[:])[0][0]
plot(xs, ys, 'ro')
plot([min(xs), switch], [bb00 + min(xs)*bb01, bb00 + switch*bb01])
plot([switch, max(xs)], [bb10 + switch*bb11, bb10 + max(xs)*bb11])
show()
from OOH import tube_model
from pymc import MCMC
from pylab import hist, show, bar, plot
import numpy as np
#from pymc.Matplot import plot
M = MCMC(tube_model)
M.sample(iter = 100000, burn = 1000, thin = 10)
# hist(M.trace("after_mean")[:])
# hist(M.trace("before_mean")[:])
# show()
#plot(M)
#show()
before_mean_samples = M.trace("before_mean")[:]
after_mean_samples = M.trace("after_mean")[:]
start_time_samples = M.trace("start_t")[:]
N = start_time_samples.shape[0]
expected_conversions_per_day = np.zeros(16)
for day in range(0, 16):
ix = day < start_time_samples
expected_conversions_per_day[day] = ((before_mean_samples[ix].sum()) + (after_mean_samples[~ix].sum())) / N
print(expected_conversions_per_day)
plot(list(range(16)), expected_conversions_per_day)
show()
import numpy as np
from matplotlib import pylab as plt
import dive_model
#import noba_model
import pymc
from pymc import MCMC
from pymc.Matplot import plot as mcplot
M = MCMC(dive_model)
M.sample(iter=2000000, burn=0, thin=10, verbose=0)
mcplot(M)
plt.hist([M.trace('intrinsic_rate')[:]], 500, label='intrinsic')
plt.hist([M.trace('social_rate')[:]], 500, label='social')
plt.legend(loc='upper left')
plt.xlim(0, 0.2)
plt.show()
d1 = M.trace('blind_angle')[:]
bc = d1 * 180 / 3.142
plt.hist(bc, 20)
plt.xlim(0, 380)
plt.show()
plt.hist([M.trace('lag')[:]])
plt.legend(loc='upper left')
plt.xlim(0, 5)
plt.show()
plt.hist([M.trace('dist')[:]], 100)
b=10) #hypothetical ground truth
botOutput = TruncatedNormal('botOutput', mu=mu, tau=t, a=1, b=10)
humanOutput = TruncatedNormal('humanOutput', mu=mu, tau=t, a=1, b=10)
#when we have data from the model we can use this here
#like this d = pymc.Binomial(‘d’, n=n, p=theta, value=np.array([0.,1.,3.,5.]), observed=True)
sim = MCMC([mu, botOutput, humanOutput])
for s in sampleSize:
#get s number of samples, no burn in for this- not optimizing anything
print 'sample size: {} | variance: {} '.format(s, t)
sim.sample(s, 0, 1)
#assume no bias at this point but we can add bias later
b = 0
#computer is now varying
botOutput = sim.trace("botOutput")[:]
#vary the human output for this image
#humans probably only give ratings at the 0.5 interval, not smaller
# humanOutput = round_to_half(sim.trace("humanOutput")[:])
humanOutput = sim.trace("humanOutput")[:]
#difference of the means
#but what we care about is the mean of the human output for each image.
difference = botOutput - humanOutput.mean()
#HighestDensityInterval: where 95% of the differences are? are they close to 0?
HDI = HDIofMCMC(differenceOfMeans=difference, credMass=credibleMass)
#ROPE
if strictly == True:
ROPE = difference[(difference <= ROPESize)
& (difference >= (0 - ROPESize))]
probabilityInROPE = np.round(len(ROPE) * 1.0 / len(difference) *
1.0,
if __name__ == '__main__':
# Create the MCMC object and start sampling
pymc_model = pymc.Model([k1, k2, k3, robertson_model, output])
mcmc = MCMC(pymc_model)
mcmc.sample(iter=10000, burn=5000, thin=5)
# Show the pymc histograms and autocorrelation plots
plt.ion()
pymc.Matplot.plot(mcmc)
plt.show()
# Plot the original data along with the sampled trajectories
plt.figure()
plt.plot(tspan, ydata_norm[:,0], 'r')
plt.plot(tspan, ydata_norm[:,1], 'g')
plt.plot(tspan, ydata_norm[:,2], 'b')
num_timecourses = 1000
num_iterations_sampled = mcmc.trace('robertson_model')[:].shape[0]
plt.plot(tspan, mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:,0::3].T, alpha=0.05, color='r')
plt.plot(tspan, mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:,1::3].T, alpha=0.05, color='g')
plt.plot(tspan, mcmc.trace('robertson_model')[num_iterations_sampled -
num_timecourses:,2::3].T, alpha=0.05, color='b')
# Show k1/k3 scatter plot
plt.figure()
plt.scatter(mcmc.trace('k1')[:], mcmc.trace('k3')[:])
if __name__ == '__main__':
# Build a model
# NOTE: Be careful to avoid namespace clashes with pysb.Model!
pymc_model = pymc.Model([k, decay_model])
# Initialize an MCMC object from the model
mcmc = MCMC(pymc_model)
# Sample
mcmc.sample(iter=15000, burn=5000, thin=10)
# Plot the posterior distribution of the parameter k
plt.ion()
Matplot.plot(mcmc)
# Plot the original data (underlying and noisy)
# along with the sampled trajectories
plt.figure()
plt.plot(tspan, ysim, color='r')
plt.plot(tspan, ydata, color='g')
num_to_plot = 1000
k_vals = mcmc.trace('k')[:]
if num_to_plot > len(k_vals):
num_to_plot = len(k_vals)
for i in range(num_to_plot):
solver.run(np.array([A_0.value, k_vals[i], 1.0]))
plt.plot(tspan, solver.yobs['A_obs'], alpha=0.05, color='b')
#Averaged experiments
@stochastic
def vars(x_plus_gen=x_plus_gen,
y_plus_gen=y_plus_gen,
x_minus_gen=x_minus_gen,
y_minus_gen=y_minus_gen,
value=0):
return pymc.mv_normal_like(
[x_plus_gen, y_plus_gen, x_minus_gen, y_minus_gen],
experiment['y_exp'], experiment['y_covar_inv'])
# Model
if load_last_model:
mcmc = pymc.database.pickle.load('mcmc-{}.pickle'.format(name))
else:
mcmc = MCMC([vars, gamma, deltaB, rB],
db='pickle',
dbmode='w',
dbname='mcmc-{}.pickle'.format(name))
mcmc.sample(iter=N, burn=min(5000, int(N / 10)), thin=1)
for v in var_list:
commons.plot(
mcmc.trace(v.__name__)[:], v.__doc__,
"pics/{}_{}.png".format(name, v.__name__))
for x, y in combinations(var_list, 2):
commons.plot_2d_hist(
mcmc.trace(x.__name__)[:],
mcmc.trace(y.__name__)[:],
"pics/{}_{}-{}_hist.png".format(name, x.__name__, y.__name__))
print 'R_effective (bulge) / R_effective (disk) =', \
M.stats()['r_e_B']['mean'] / M.stats()['r_e_D']['mean']
print 'Effective surface brightness of the bulge: \n', \
' Best-fit value:', M.stats()['M_e_B']['mean'], \
'\n 95% Confidence interval:', M.stats()['M_e_B']['quantiles'][2.5], \
'to', M.stats()['M_e_B']['quantiles'][97.5]
# ### Visualizing specific realizations of our model ###
# The *trace()* method presents the values of a variable for all of the saved
# Markov Chain steps. Let's plot up several of these traces, and see how
# the model changes with different parameter values.
for i in range(50):
plt.plot(M.r.value, M.trace('SB')[i], c='gray', alpha=.25)
plt.scatter(M.r.value, M.mags.value, c='r')
plt.gca().invert_yaxis()
plt.xlabel('radius (")')
plt.ylabel('Surface Brightness (mag)')
plt.show()
# ### Visualizing the best-fit model and its components ###
# Now that we have our best-fit, let's see how it decomposes into the components,
# the bulge and the disk. In other words, we can finally take our results and
# explore what they imply about the physical system we observed!
# our best-fit parameters
r_e_B = M.stats()['r_e_B']['mean']
def run(self, debug_info=dict()):
'''Run delineation process for each R-R interval.'''
r_list = self.r_list
result_dict = self.result_dict
fs = self.fs
raw_sig = self.raw_sig
p_wave_length = self.p_wave_length
r_detector = DPI_QRS_Detector()
for ind in xrange(0, len(r_list) - 1):
print 'Progress: %d R-R intervals left.' % (len(r_list) - 1 - ind)
if ind > 1:
print 'Debug break.'
break
region_left = r_list[ind]
region_right = r_list[ind + 1]
QR_length = fs / 46.0
PR_length = 0.5 * (region_right - region_left)
cut_x_list = [
int(region_right - PR_length),
int(region_right - QR_length)
]
sig_seg = raw_sig[cut_x_list[0]:cut_x_list[1]]
sig_seg = r_detector.HPF(sig_seg, fs=fs, fc=3.0)
sig_seg = sig_seg[:cut_x_list[1] - cut_x_list[0]]
if len(sig_seg) <= 75:
print 'R-R interval %d is too short!' % len(sig_seg)
continue
p_model = P_model_Gaussian.MakeModel(sig_seg, p_wave_length, fs=fs)
M = MCMC(p_model)
M.sample(iter=2000, burn=1000, thin=10)
# retrieve parameters
hermit_coefs = list()
for h_ind in xrange(0, P_model_Gaussian.HermitFunction_max_level):
hermit_value = np.mean(M.trace('hc%d' % h_ind)[:])
hermit_coefs.append(hermit_value)
# P wave shape parameters
gpos = np.mean(M.trace('gaussian_start_position')[:])
gsigma = np.mean(M.trace('gaussian_sigma')[:])
gamp = np.mean(M.trace('gaussian_amplitude')[:])
print 'Results:'
print 'gpos = ', gpos
print 'gsigma = ', gsigma
print 'gamp = ', gamp
len_sig = cut_x_list[1] - cut_x_list[0]
fitting_curve = P_model_Gaussian.GetFittingCurve(
len_sig, gpos, gsigma, gamp, hermit_coefs)
baseline_curve = P_model_Gaussian.GetFittingCurve(
len_sig, gpos, gsigma, 0, hermit_coefs)
plt.figure(1)
plt.clf()
plt.plot(sig_seg, label='ECG')
plt.plot(fitting_curve, label='fitting curve')
plt.plot(baseline_curve,
linestyle='--',
alpha=0.3,
lw=2,
label='baseline curve')
plt.plot(gpos, fitting_curve[gpos], 'r^', markersize=12)
plt.legend()
plt.grid(True)
if 'plot_title' in debug_info:
plt.title(debug_info['plot_title'], fontproperties=zn_font)
if 'plot_xlabel' in debug_info:
plt.xlabel(debug_info['plot_xlabel'])
plt.show(block=False)
plt.savefig('./results/tmp/%d.png' % int(time.time()))
peak_pos = int(gpos + gsigma / 2.0)
peak_global_pos = peak_pos + cut_x_list[0]
# Save to result dict
result_dict['gamp'].append(gamp)
result_dict['gsigma'].append(gsigma)
result_dict['gpos'].append(gpos)
result_dict['hermit_coefs'].append(hermit_coefs)
result_dict['segment_range'].append(cut_x_list)
result_dict['peak_global_pos'].append(peak_global_pos)
continue
return result_dict
out[:s] = e
out[s:] = l
return out
datapoints = Normal('datapoints', mu=rate, tau=.1, value=dataSet, observed=True)
vars = [
changepoint,
early_mean,
late_mean,
datapoints]
M = MCMC(vars)
M.sample(iter=100000, burn=1000, thin=10)
#%%
hist(M.trace('late_mean')[:],100)
hist(M.trace('early_mean')[:],100)
hist(M.trace('changepoint')[:],100)
#
##%%
#
#switchpoint = DiscreteUniform('switchpoint', lower=0, upper=110, doc='Switchpoint[year]')
#
#early_mean = Exponential('early_mean', beta=1.)
#late_mean = Exponential('late_mean', beta=1.)
#
#@deterministic(plot=False)
converted_data = [(float(x[0]), float(x[1]), float(x[2])) for x in data]
xs = [x[1] for x in converted_data]
ys = [x[2] for x in converted_data]
b0 = Normal("b0", 0, 0.0003)
b1 = Normal("b1", 0, 0.0003)
err = Uniform("err", 0, 500)
x_weight = Normal("weight", 0, 1, value=xs, observed=True)
@deterministic(plot=False)
def pred(b0=b0, b1=b1, x=x_weight):
return b0 + b1*x
y = Normal("y", mu=pred, tau=err, value=ys, observed=True)
model = Model([pred, b0, b1, y, err, x_weight])
m = MCMC(model)
m.sample(burn=2000, iter=10000)
bb0 = sum(m.trace('b0')[:])/len(m.trace('b0')[:])
bb1 = sum(m.trace('b1')[:])/len(m.trace('b1')[:])
err = sum(m.trace('err')[:])/len(m.trace('err')[:])
plot(xs, ys)
plot([min(xs), max(xs)], [bb0 + bb1*min(xs), bb0 + bb1*max(xs)])
show()
import lh
from pymc import MCMC
from pymc.Matplot import plot
from matplotlib.pyplot import hist2d
import matplotlib.pyplot as plt
M = MCMC(lh)
M.sample(iter=50000, burn=1000, thin=5)
print
plot(M)
M.alpha.summary()
M.beta.summary()
alpha_arr = M.trace('alpha')[:]
beta_arr = M.trace('beta')[:]
H, xedges, yedges, img = hist2d(alpha_arr, beta_arr, 250)
extent = [yedges[0], yedges[-1], xedges[0], xedges[-1]]
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1)
im = ax.imshow(H, extent=extent, cmap=plt.cm.hot)
fig.colorbar(im, ax=ax)
plt.axes().set_aspect(0.67)
plt.tight_layout(pad=0.4)
plt.savefig('lighthouse_cm_uniform.png')
plt.close()
@deterministic
def y_plus_gen(gamma=gamma, deltaB=deltaB, rB=rB):
return commons.y_plus(gamma, deltaB, rB)
@deterministic
def x_minus_gen(gamma=gamma, deltaB=deltaB, rB=rB):
return commons.x_minus(gamma, deltaB, rB)
@deterministic
def y_minus_gen(gamma=gamma, deltaB=deltaB, rB=rB):
return commons.y_minus(gamma, deltaB, rB)
#Averaged experiments
@stochastic
def vars(x_plus_gen=x_plus_gen, y_plus_gen=y_plus_gen, x_minus_gen=x_minus_gen, y_minus_gen=y_minus_gen, value=0):
return pymc.mv_normal_like([x_plus_gen, y_plus_gen, x_minus_gen, y_minus_gen], experiment['y_exp'], experiment['y_covar_inv'])
# Model
if load_last_model:
mcmc = pymc.database.pickle.load('mcmc-{}.pickle'.format(name))
else:
mcmc = MCMC([vars, gamma, deltaB, rB],
db='pickle',
dbmode='w',
dbname='mcmc-{}.pickle'.format(name))
mcmc.sample(iter = N, burn = min(5000, int(N/10)), thin = 1)
for v in var_list:
commons.plot(mcmc.trace(v.__name__)[:], v.__doc__, "pics/{}_{}.png".format(name, v.__name__))
for x,y in combinations(var_list, 2):
commons.plot_2d_hist(mcmc.trace(x.__name__)[:], mcmc.trace(y.__name__)[:],
"pics/{}_{}-{}_hist.png".format(name, x.__name__, y.__name__))
import constantModelAlign
import decayModel
import decayModelAlign
import networkModelMC
import networkModelAlignMC
import pymc
from pymc import MCMC
from pymc.Matplot import plot as mcplot
### random walk model
M = MCMC(corRandomWalk)
M.sample(iter=50000, burn=25000, thin=10,verbose=0)
np.save('mc_data/crw_rho_m.npy',M.trace('rho_m')[:])
## environment model
M = MCMC(environment)
M.sample(iter=50000, burn=25000, thin=10,verbose=0)
np.save('mc_data/env_rho_m.npy',M.trace('rho_m')[:])
np.save('mc_data/env_rho_e.npy',M.trace('rho_e')[:])
np.save('mc_data/env_beta.npy',M.trace('beta')[:])
## constant model
M = MCMC(constantModel)
M.sample(iter=50000, burn=25000, thin=10,verbose=0)
np.save('mc_data/cm_rho_s.npy',M.trace('rho_s')[:])
np.save('mc_data/cm_alpha.npy',M.trace('alpha')[:])
np.save('mc_data/cm_ia.npy',M.trace('interaction_angle')[:])
# do the following
# (has mean around 1e2, with a variance of 9 logs in base 10)
mean_b10 = 2
var_b10 = 9
print "Setting mean (base 10) to %f, variance (base 10) to %f" % (mean_b10, var_b10)
# The lognormal variable
k = Lognormal('k', mu=np.log(10 ** mean_b10),
tau=1./(np.log(10) * np.log(10 ** var_b10)))
# Sample it
m = MCMC(Model([k]))
m.sample(iter=50000)
ion()
# Plot the distribution in base e
figure()
y = log(m.trace('k')[:])
y10 = log10(m.trace('k')[:])
hist(y, bins=100)
print
print "Mean, base e: %f; Variance, base e: %f" % (mean(y), var(y))
# Plot the distribution in base 10
figure()
hist(y10, bins=100)
print "Mean, base 10: %f; Variance, base 10: %f" % (mean(y10), var(y10))
out[s:] = l
return out
datapoints = Normal('datapoints',
mu=rate,
tau=.1,
value=dataSet,
observed=True)
vars = [changepoint, early_mean, late_mean, datapoints]
M = MCMC(vars)
M.sample(iter=100000, burn=1000, thin=10)
#%%
hist(M.trace('late_mean')[:], 100)
hist(M.trace('early_mean')[:], 100)
hist(M.trace('changepoint')[:], 100)
#
##%%
#
#switchpoint = DiscreteUniform('switchpoint', lower=0, upper=110, doc='Switchpoint[year]')
#
#early_mean = Exponential('early_mean', beta=1.)
#late_mean = Exponential('late_mean', beta=1.)
#
#@deterministic(plot=False)
#def rate(s=switchpoint, e=early_mean, l=late_mean):
# ''' Concatenate Poisson means '''
# out = np.empty(len(disasters_array))
# self.reject()
return locals()
if __name__ == '__main__':
model = make_bma()
M = MCMC(model)
M.use_step_method(model['ModelMetropolis'], model['regression_model'])
M.sample(iter=5000, burn=1000, thin=1)
model_chain = M.trace("regression_model")[:]
from collections import Counter
counts = Counter(model_chain).items()
counts.sort(reverse=True, key=lambda x: x[1])
for f in counts[:10]:
columns = unpack(f[0])
print('Visits:', f[1])
print(np.array([1. if i in columns else 0 for i in range(0,M.rank)]))
print(M.coefficients.flatten())
X = sm.add_constant(M.X[:, columns], prepend=True)
corr = np.corrcoef(X[:,1:], rowvar=0)
prior = np.linalg.det(corr)
fit = sm.OLS(model['y'],X).fit()
out[s:] = l
return out
from pymc.examples import DisasterModel
from pymc import MCMC
M = MCMC(DisasterModel)
M.isample(iter=10000, burn=1000, thin=10)
M.trace('s')[:]
#array([41, 40, 40, ..., 43, 44, 44])
from pylab import hist, show
hist(M.trace('l')[:])
#(array([ 8, 52, 565, 1624, 2563, 2105, 1292, 488, 258, 45]),
#array([ 0.52721865, 0.60788251, 0.68854637, 0.76921023, 0.84987409,
# 0.93053795, 1.01120181, 1.09186567, 1.17252953, 1.25319339]),
#<a list of 10 Patch objects>)
show()
from pymc.Matplot import plot