def sample_hyperparameters(state):
# http://bit.ly/1baZ3zf
T = state['T']
num_samples = 10 # R
aalpha = 5
balpha = 0.1
abeta = 0.1
bbeta = 0.1
bgamma = 0.1 # ?
agamma = 5 # ?
# for (int r = 0; r < R; r++) {
for r in range(num_samples):
# gamma: root level (Escobar+West95) with n = T
eta = beta(state['gamma'] + 1, T).rvs()
bloge = bgamma - np.log(eta)
K = state['num_topics']
pie = 1. / (1. + (T * bloge / (agamma + K - 1)))
u = bernoulli(pie).rvs()
state['gamma'] = gamma(agamma + K - 1 + u, 1. / bloge).rvs()
# alpha: document level (Teh+06)
qs = 0.
qw = 0.
for m, doc in enumerate(state['docs']):
qs += bernoulli(len(doc) * 1. / (len(doc) + state['alpha'])).rvs()
qw += np.log(beta(state['alpha'] + 1, len(doc)).rvs())
state['alpha'] = gamma(aalpha + T - qs, 1. / (balpha - qw)).rvs()
state = update_beta(state, abeta, bbeta)
return state
def test_entropy(self):
# Simple tests of entropy.
b = stats.bernoulli(0.25)
expected_h = -0.25*np.log(0.25) - 0.75*np.log(0.75)
h = b.entropy()
assert_allclose(h, expected_h)
b = stats.bernoulli(0.0)
h = b.entropy()
assert_equal(h, 0.0)
b = stats.bernoulli(1.0)
h = b.entropy()
assert_equal(h, 0.0)
def connectivityMatrixNew(self):
self.patterns =np.random.normal(0,1, size=(self.p,self.N))
mybin=np.random.binomial(1,0.5,size=(self.p,self.N))
#self.patterns =np.multiply(mybin,np.random.normal(-1,1, size=(self.p,self.N)))+np.multiply(1-mybin,np.random.normal(1,1,size=(self.p,self.N)))
#mu1=0.0
#sigma1=1.0
#self.patterns =np.random.lognormal(mu1,sigma1, size=(self.p,self.N))-np.exp(mu1+(sigma1**2)/2.)
print 'Patterns created. N patterns:',self.p
patterns_pre=self.patterns
patterns_post=self.patterns
#creating connectivity with sparse matrices
rv=bernoulli(1).rvs
#connectivity=sparse.csr_matrix(sparse.random(self.N,self.N,density=self.c,data_rvs=rv))
indexes=sparse.find(sparse.random(self.N,self.N,density=self.c,data_rvs=rv))
print 'Connectivity created. N patterns:',self.p
#finding the non zero entries
#index_row=sparse.find(connectivity)[0]
#index_col=sparse.find(connectivity)[1]
# smart way to write down the outer product learning
connectivity=(self.Amp/(self.c*self.N))*np.einsum('ij,ij->j',patterns_post[:,indexes[0]],patterns_pre[:,indexes[1]])
connectivity=sparse.csr_matrix((connectivity,(indexes[0],indexes[1])),shape=(self.N,self.N))
'Connectivity loaded with patterns. N patterns:',self.p
self.connectivity=connectivity
def sample(hyperparameters, rho, K, F):
"Sample from the model."
G = len(rho)
q_alpha = GammaDist(hyperparameters.a_alpha, hyperparameters.b_alpha)
alpha = q_alpha.sample()
q_beta = GammaDist(hyperparameters.a_beta, hyperparameters.b_beta)
beta = q_beta.sample()
q_gamma = GammaDist(hyperparameters.a_gamma, hyperparameters.b_gamma)
gamma = q_gamma.sample()
q_lambda = GammaDist(hyperparameters.a_lambda, hyperparameters.b_lambda)
lambda_ = q_lambda.sample()
q_tau = DirichletDist(hyperparameters.a_tau)
tau = q_tau.sample()
q_omega = DirichletDist(hyperparameters.a_omega)
omega = q_omega.sample()
q_pi_bar = BetaDist(numpy.ones(K), gamma * numpy.ones(K))
pi_bar = q_pi_bar.sample()
pi = numpy.empty_like(pi_bar)
for k in xrange(K-1):
pi[k] = pi_bar[k] * (1.-pi_bar[:k]).prod()
pi[-1] = 1. - pi[:-1].sum()
if pi[-1] < 0.: # adjust for numerical errors
pi[-1] = 0.
theta = numpy.random.dirichlet(alpha * pi, size=G)
phi = numpy.empty((K+1, F))
phi[0] = numpy.random.dirichlet(lambda_ * omega)
phi[1:] = numpy.random.dirichlet(beta * tau, size=K)
# sample the correct number of sites for each gene
sites = [None] * G
for g, rho_g in enumerate(rho):
v_g = [bernoulli(rho_i) for rho_i in rho_g]
z_g = [v_gi and discrete_sample(theta[g])+1 or 0 for v_gi in v_g]
x_g = [discrete_sample(phi[z_gi]) for z_gi in z_g]
sites[g] = (v_g, z_g, x_g)
result_type = namedtuple('Sample', 'alpha beta gamma lambda_ tau omega pi_bar pi theta phi sites')
return result_type(
alpha=alpha,
beta=beta,
gamma=gamma,
lambda_=lambda_,
tau=tau,
omega=omega,
pi_bar=pi_bar,
pi=pi,
theta=theta,
phi=phi,
sites=sites,
)
def sample(self, model, evidence):
# Metropolis-Hastings (based on Kim, Shephard and Chib(1998))
MAX_REJECT = 100000
h, sigma_h = evidence['h'], evidence['sigma_h']
current_phi = evidence['phi']
alpha = model.hyper_params['alpha_phi']
mu_h = model.known_params['mu_h']
g = lambda phi: (alpha[0] - 1)*log((1 + phi)/2.) + (alpha[1] - 1)*log((1 - phi)/2.) - \
(h[0] - mu_h)**2*(1 - phi**2)/(2*sigma_h**2) + \
1/2.*log(1 - phi**2)
for i in xrange(MAX_REJECT):
proposal_mean = sum((h[1:] - mu_h)*(h[:-1] - mu_h))/sum((h[:-1] - mu_h)**2)
proposal_var = sigma_h**2/sum((h[:-1] - mu_h)**2)
try:
proposed_phi = stats.norm(proposal_mean, sqrt(proposal_var)).rvs()
except:
pdb.set_trace()
if -1 < proposed_phi < 1:
accept_rv = stats.bernoulli(max(min(exp(g(proposed_phi) - g(current_phi)), 1), 0))
if accept_rv.rvs():
self.update_acceptance_rate(1./(i + 1))
return proposed_phi
raise Exception('Metropolis-Hastings rejected too many: %d'%MAX_REJECT)
def test_parameters_sampler_replacement():
# raise error if n_iter too large
params = {'first': [0, 1], 'second': ['a', 'b', 'c']}
sampler = ParameterSampler(params, n_iter=7)
assert_raises(ValueError, list, sampler)
# degenerates to GridSearchCV if n_iter the same as grid_size
sampler = ParameterSampler(params, n_iter=6)
samples = list(sampler)
assert_equal(len(samples), 6)
for values in ParameterGrid(params):
assert_true(values in samples)
# test sampling without replacement in a large grid
params = {'a': range(10), 'b': range(10), 'c': range(10)}
sampler = ParameterSampler(params, n_iter=99, random_state=42)
samples = list(sampler)
assert_equal(len(samples), 99)
hashable_samples = ["a%db%dc%d" % (p['a'], p['b'], p['c'])
for p in samples]
assert_equal(len(set(hashable_samples)), 99)
# doesn't go into infinite loops
params_distribution = {'first': bernoulli(.5), 'second': ['a', 'b', 'c']}
sampler = ParameterSampler(params_distribution, n_iter=7)
samples = list(sampler)
assert_equal(len(samples), 7)
def test_list_of_rvs(self):
emissions = np.ones((3, 7))
tmat = np.eye(3)
durations = [
bernoulli(0.1, loc=1),
bernoulli(0.1, loc=3),
bernoulli(0.1, loc=5),
]
hsmm = HSMMModel(MultinomialEmissions(emissions), durations, tmat)
discrete_durations = np.zeros((3, 100))
discrete_durations[(0, 1, 2), (0, 2, 4)] = 0.9
discrete_durations[(0, 1, 2), (1, 3, 5)] = 0.1
np.testing.assert_array_almost_equal(
hsmm._durations, discrete_durations
)
def epsilon_greedy(self, epsilon=0.1):
'''
Pick a bandit uniformly at random epsilon percent of the time.
Otherwise pick the bandit with the best observed proportion of winning.
Return the index of the winning bandit.
'''
if stats.bernoulli(epsilon).rvs() == 1:
return random_choice(self)
else:
return max_mean(self)
def test_rvs(self):
vals = stats.bernoulli.rvs(0.75, size=(2, 50))
assert numpy.all(vals >= 0) & numpy.all(vals <= 1)
assert numpy.shape(vals) == (2, 50)
assert vals.dtype.char in typecodes["AllInteger"]
val = stats.bernoulli.rvs(0.75)
assert isinstance(val, int)
val = stats.bernoulli(0.75).rvs(3)
assert isinstance(val, numpy.ndarray)
assert val.dtype.char in typecodes["AllInteger"]
def Bernoulli(p, tag=None):
"""
A Bernoulli random variate
Parameters
----------
p : scalar
The probability of success
"""
assert 0<p<1, 'Bernoulli probability "p" must be between zero and one, non-inclusive'
return uv(ss.bernoulli(p), tag=tag)
def test_decode_options():
"""Test some other options for the decode function."""
model = GaussianNB()
mvpa._decode_subject(dataset, model)
mvpa._decode_subject(dataset_3d, model)
splits = stats.bernoulli(.5).rvs(24)
mvpa._decode_subject(dataset, model, cv="sample")
mvpa._decode_subject(dataset, model, cv=5)
mvpa._decode_subject(dataset, model, split_pred=splits)
mvpa._decode_subject(dataset, model, trialwise=True)
mvpa._decode_subject(dataset, model, logits=True)
def proposal(self, proc): if self.is_family(proc, rd.distributions.bernoulli_gen): xp = rd.bernoulli(0.5).rvs() F = R = np.log(0.5) elif self.is_family(proc, rd.distributions.norm_gen) or self.is_family(proc, normal_func): rng = rd.norm(proc.val, np.sqrt(proc.var())) xp = rng.rvs() F = R = np.log(rng.pdf(xp)) elif self.is_family(proc, gamma_func): rng = rd.norm(proc.val, np.sqrt(proc.var())) xp = rng.rvs() F = R = np.log(rng.pdf(xp)) else: xp = proc.rvs() F = np.log(proc.pdf(xp)) R = np.log(proc.pdf(proc.val)) return (xp, F, R)
def test_decode_shapes():
"""Test that we get expected shapes from decode function."""
model = GaussianNB()
accs = mvpa._decode_subject(dataset, model)
assert_equal(accs.shape, (1,))
accs = mvpa._decode_subject(dataset_3d, model)
assert_equal(accs.shape, (4,))
splits = stats.bernoulli(.5).rvs(24)
accs = mvpa._decode_subject(dataset, model, split_pred=splits)
assert_equal(accs.shape, (2,))
accs = mvpa._decode_subject(dataset_3d, model, split_pred=splits)
assert_equal(accs.shape, (4, 2))
accs = mvpa._decode_subject(dataset, model, trialwise=True)
assert_equal(accs.shape, (len(dataset["y"]),))
accs = mvpa._decode_subject(dataset_3d, model, trialwise=True)
assert_equal(accs.shape, (4, len(dataset["y"])))
def test_randomize_classifier():
"""Test basic functions of randomize_classifier."""
data = dict(X=spstats.norm(0, 1).rvs((100, 12)),
y=spstats.bernoulli(.5).rvs(100),
runs=np.repeat([0, 1], 50))
model = GaussianNB()
p_vals, perm_vals = stat.randomize_classifier(data, model,
return_dist=True)
p_min, p_max = p_vals.min(), p_vals.max()
perm_mean = perm_vals.mean()
# Test that the p value are well behaved
nose.tools.assert_greater_equal(1, p_max)
nose.tools.assert_greater_equal(p_min, 0)
# Test that the mean is close to chance (this is probabilistic)
nose.tools.assert_greater(.1, np.abs(perm_mean - 0.5))
# Test that the distribution looks normal (this is probabilistic)
val, p = spstats.normaltest(perm_vals)
nose.tools.assert_greater(p, 0.001)
def connectivityMatrixNew(self):
print 'Patterns created. N patterns:',self.p
patterns_pre=self.g(self.patterns_fr)
patterns_post=self.f(self.patterns_fr)
#creating connectivity with sparse matrices
rv=bernoulli(1).rvs
#connectivity=sparse.csr_matrix(sparse.random(self.N,self.N,density=self.c,data_rvs=rv))
indexes=sparse.find(sparse.random(self.N,self.N,density=self.c,data_rvs=rv))
print 'Connectivity created. N patterns:',self.p
#finding the non zero entries
#index_row=sparse.find(connectivity)[0]
#index_col=sparse.find(connectivity)[1]
# smart way to write down the outer product learning
connectivity=(self.Amp/(self.c*self.N))*np.einsum('ij,ij->j',patterns_post[:,indexes[0]],patterns_pre[:,indexes[1]])
connectivity=sparse.csr_matrix((connectivity,(indexes[0],indexes[1])),shape=(self.N,self.N))
'Connectivity loaded with patterns. N patterns:',self.p
self.connectivity=connectivity
def gen_data_anti(t=.3, a=2., v_pro=1., v_stop=1., v_anti=1.,
t_anti=1., p_stop=1.):
from scipy.stats import bernoulli
if t < 0 or a < 0 or v_pro < 0 or v_anti < 0 or t_anti < 0 or p_stop < 0 or p_stop > 1:
return None
func = likelihoods.fast_invgauss
x_pro = copy(func(t, a, v_pro, accum=0))
x_anti = func(t + t_anti, a, v_anti, accum=1)
x_stop = func(t, a, v_stop, accum=2)
if p_stop < 1:
stop = bernoulli(p_stop).rvs(x_stop.shape)
x_stop[np.logical_not(stop)] = np.inf
x_pro[x_pro > x_stop] = np.inf
idx = x_pro > x_anti
x_pro[idx] = -x_anti[idx]
data = x_pro
return data
from scipy import stats
stats.uniform(0, 1).rvs()
stats.bernoulli(0.6).rvs()
#plots
------------------------------------------
import matploblib.pyplot as plt
%matplotlib inline
plt.style.use('ggplot')
from pandas.plotting import scatter_matrix
#diagonal='kde' changes 斜向的 histogram 改成了线 图
_ = scatter_matrix(concrete, alpha=0.2, figsize=(20, 20), diagonal='kde')
#changes pandas series to numpy array
y = grad['admit'].values
variable_names = ['gre', 'gpa', 'rank']
# generate jitter, 数量和 df 数据行数一样 len(grad)
jitter = stats.uniform(-0.03,0.06).rvs(len(grad))
fig, axs = plt.subplots(1, 3, figsize = (14, 4))
#variable_names 一定要有3 个，因为 axs 有 1行，3 个
for variable, ax in zip(variable_names, axs.flatten()):
ax.scatter(grad[variable], y + jitter, s=10, alpha=0.1)
ax.text(0.1, 0.4, 'Ride the light!', fontsize = 35)
fig.tight_layout()
------------------------------------------
#provide random test data
#Random values in a given shape.
# <nbformat>3.0</nbformat>
# <headingcell level=1>
# [最大似然估计](http://nbviewer.ipython.org/github/rlabbe/Python-for-Signal-Processing/blob/master/Maximum_likelihood.ipynb)
# <codecell>
from __future__ import division
from scipy.stats import bernoulli
import numpy as np
# <codecell>
p_true=1/2 # this is the value we will try to estimate from the observed data
fp=bernoulli(p_true)
def sample(n=10):
'simulate coin flipping'
return fp.rvs(n)# flip it n times
xs = sample(100) # generate some samples
# <codecell>
import sympy
from sympy.abc import x, z
p=sympy.symbols('p',positive=True)
sympy.init_printing()
# <codecell>
def _scipy(self, loc=0.0, scale=1.0):
return ss.bernoulli(p=self.p, loc=loc)
# -*- coding: utf-8 -*- """ Created on Mon Mar 24 22:16:17 2014 在scipy.stats中，有直接表达伯努利分布的函数bernoulli 。事实上，在scipy.stats中，有许多常见的分布函数 @author: Administrator """ from scipy.stats import bernoulli rv = bernoulli(0.8) x = [-1, 0, 1, 2] print(rv.cdf(x))
def flip_coin(self):
return int(scs.bernoulli(self.coin).rvs(1))
def test_trialwise_split_exclusivity():
"""Test that we can't split predictions and get trialwise scores."""
model = GaussianNB()
splits = stats.bernoulli(.5).rvs(24)
mvpa._decode_subject(dataset, model, split_pred=splits, trialwise=True)
# coding:utf-8
from scipy.stats import bernoulli
import matplotlib.pyplot as plt
import numpy as np
import seaborn as sns
p = 0.0001
log = []
for i in range(100):
print(i)
tmp = bernoulli(p).rvs(size=10 ** 6)
log = + (np.diff(np.where(tmp == 1)[0]))
print(len(log))
# print np.mean(log)
# print np.var(log)
sns.distplot(log)
plt.show()
## declare variables
font_size = 11
font_name = 'sans-serif'
n = 10000
fig = plt.figure(figsize=(10,6))
splot = 0
## loop through parameterizations of the beta
for p in [0.3,0.6,0.9]:
splot += 1
ax = fig.add_subplot(1,3,splot)
x = np.arange(scs.bernoulli.ppf(0.01, p),scs.bernoulli.ppf(0.99, p)+1)
ax.plot(x, scs.bernoulli.pmf(x, p), 'bo', ms=8, label='pmf')
ax.vlines(x, 0, scs.bernoulli.pmf(x, p), colors='b', lw=5, alpha=0.5)
rv = scs.bernoulli(p)
ax.set_ylim((0,1.0))
ax.set_xlim((-0.25, 1.25))
ax.set_title("p=%s"%(p))
ax.set_aspect(1./ax.get_data_ratio())
for t in ax.get_xticklabels():
t.set_fontsize(font_size-1)
t.set_fontname(font_name)
for t in ax.get_yticklabels():
t.set_fontsize(font_size-1)
t.set_fontname(font_name)
plt.savefig("bernoulli-distn.png", dpi=400)
plt.show()
import nose.tools
import nose.tools as nt
from nose.tools import assert_equal, assert_almost_equal, raises
import pandas.util.testing as pdt
from .. import statistical as stat
rs = np.random.RandomState(sum(map(ord, "moss_stats")))
a_norm = rs.randn(100)
a_range = np.arange(101)
datasets = [
dict(X=spstats.norm(0, 1).rvs((24, 12)),
y=spstats.bernoulli(.5).rvs(24),
runs=np.repeat([0, 1], 12)) for i in range(3)
]
datasets_3d = [
dict(X=spstats.norm(0, 1).rvs((4, 24, 12)),
y=spstats.bernoulli(.5).rvs(24),
runs=np.repeat([0, 1], 12)) for i in range(3)
]
def test_bootstrap():
"""Test that bootstrapping gives the right answer in dumb cases."""
a_ones = np.ones(10)
n_boot = 5
out1 = stat.bootstrap(a_ones, n_boot=n_boot)
beta = 1
p = 0.75
width = 0.25
lower = -3
upper = 3
numBins = int((upper - lower) / (width)) + 1
interval = np.array(
[-10**10, -2.5, -2, -1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2, 2.5, 10**10])
standard = np.zeros(len(interval) - 1)
relative_freq = np.zeros(len(interval) - 1)
for n in [5, 15, 50]:
Zs = [uniform(-1, 1, n, N), gamma(alpha, beta, n, N), bernoulli(p, n, N)]
Z_names = ["Uniform", "Gamma", "Bernoulli"]
for Z, name in zip(Zs, Z_names):
for k in range(int(len(interval)) - 1):
standard[k] = norm.cdf(interval[k + 1]) - norm.cdf(interval[k])
relative_freq[k] = (np.sum(Z < interval[k + 1]) -
np.sum(Z < interval[k])) / float(len(Z))
percentiles = norm.ppf(
np.linspace(0.5 / float(N), (N - 0.5) / float(N), int(N)))
sorted_Zs = np.sort(Z)
print "Data for %s Distribution, n = %g:" % (name, n)
print "-----------------------------"
jax_dist = dist.MultivariateNormal(loc, cov, prec, tril)
mean = jax_dist.mean
cov = jax_dist.covariance_matrix
return osp.multivariate_normal(mean=mean, cov=cov)
def _lowrank_mvn_to_scipy(loc, cov_fac, cov_diag):
jax_dist = dist.LowRankMultivariateNormal(loc, cov_fac, cov_diag)
mean = jax_dist.mean
cov = jax_dist.covariance_matrix
return osp.multivariate_normal(mean=mean, cov=cov)
_DIST_MAP = {
dist.BernoulliProbs:
lambda probs: osp.bernoulli(p=probs),
dist.BernoulliLogits:
lambda logits: osp.bernoulli(p=_to_probs_bernoulli(logits)),
dist.Beta:
lambda con1, con0: osp.beta(con1, con0),
dist.BinomialProbs:
lambda probs, total_count: osp.binom(n=total_count, p=probs),
dist.BinomialLogits:
lambda logits, total_count: osp.binom(n=total_count,
p=_to_probs_bernoulli(logits)),
dist.Cauchy:
lambda loc, scale: osp.cauchy(loc=loc, scale=scale),
dist.Chi2:
lambda df: osp.chi2(df),
dist.Dirichlet:
lambda conc: osp.dirichlet(conc),
def __init__(self, theta):
self._bernoulli = bernoulli(1 - theta)
def __init__(self, parameters, *args, **kwargs):
self.probability_chronic = parameters.probability_chronic
distn = bernoulli(self.probability_chronic)
super()._copyattrs(distn)
def calc_likelihood(x, mu):
return bernoulli(mu).pmf(x)
def __init__(self, p):
self.bernoulli = stats.bernoulli(p)
self.mean = self.bernoulli.mean() # = p
def generate_data(N_A,
N_B,
p_A,
p_B,
days=None,
control_label='A',
test_label='B'):
"""Returns a pandas dataframe with fake CTR data
Example:
Parameters:
N_A (int): sample size for control group
N_B (int): sample size for test group
Note: final sample size may not match N_A provided because the
group at each row is chosen at random (50/50).
p_A (float): conversion rate; conversion rate of control group
p_B (float): conversion rate; conversion rate of test group
days (int): optional; if provided, a column for 'ts' will be included
to divide the data in chunks of time
Note: overflow data will be included in an extra day
control_label (str)
test_label (str)
Returns:
df (df)
"""
# initiate empty container
data = []
# total amount of rows in the data
N = N_A + N_B
p_B = p_B + p_A
group_bern = scs.bernoulli(0.5)
# initiate bernoulli distributions to randomly sample from
A_bern = scs.bernoulli(p_A)
B_bern = scs.bernoulli(p_B)
for idx in range(N):
# initite empty row
row = {}
# for 'ts' column
if days is not None:
if type(days) == int:
row['ts'] = idx // (N // days)
else:
raise ValueError("Provide an integer for the days parameter.")
# assign group based on 50/50 probability
row['group'] = group_bern.rvs()
if row['group'] == 0:
# assign conversion based on provided parameters
row['converted'] = A_bern.rvs()
else:
row['converted'] = B_bern.rvs()
# collect row into data container
data.append(row)
# convert data into pandas dataframe
df = pd.DataFrame(data)
# transform group labels of 0s and 1s to user-defined group labels
df['group'] = df['group'].apply(lambda x: control_label
if x == 0 else test_label)
return df
import os
import matplotlib.pyplot as plt
import numpy as np
import pandas as pd
import pymc3 as pm
from scipy.stats import bernoulli
# Config
os.chdir("/home/jovyan/work")
%config InlineBackend.figure_format = 'retina'
%matplotlib inline
plt.rcParams["figure.figsize"] = (10, 5)
np.random.seed(42)
# Prepare the data
y = bernoulli(0.22).rvs(10)
print(y)
chains = 1000 * 2**np.arange(6)
cols = ['mean', 'sd', 'mc_error', 'hpd_2.5', 'hpd_97.5', 'n_eff', 'Rhat']
df_summaries = pd.DataFrame(columns=cols)
# Inferece
for chain in chains:
with pm.Model() as model:
theta = pm.Beta("theta", alpha=1, beta=1)
throw = pm.Bernoulli("throw", theta, observed=y)
trace = pm.sample(chain, step=pm.Metropolis(), progressbar=False)
df_summaries = df_summaries.append(pm.summary(trace))
# Calculate the HPD interval range
df_summaries["hpd"] = df_summaries["hpd_97.5"] - df_summaries["hpd_2.5"]
def flip_coin(self):
return bernoulli(self.likelihood[self.coin]).rvs(1)[0]
def createBernoulliArmsFromMeans(self, means):
# Creates an instance of a bandit problem with Bernoulli distributions on each arm, where minGap denotes the minimum gap between the mean of two arms.
self.bestarm = np.argmax(means)
for a in range(0, self.A):
self.armDistributions.append(ss.bernoulli(means[a]))
self.armMeans.append(means[a])
def sample(self, x, random_state=None):
p = self.mean(x)
return st.bernoulli(p).rvs(random_state=random_state)
# draw initial sample from uniform
x_t = (uniform().rvs(size=3)*256).astype(int)
for numQ in range(120):
# draw sample from proposal distribution,
x_proposal = multivariate_normal(x_t,cov_prop).rvs().astype(int)
# resample from proposal distribution if out-of-bounds
while any(xi<0 or xi>255 for xi in x_proposal):
x_proposal = multivariate_normal(x_t,cov_prop).rvs().astype(int)
# accept with probability A(x_proposal,x_t)
A = targetdist.pdf(x_proposal)/(targetdist.pdf(x_proposal)+targetdist.pdf(x_t))
# accept proposal
if bernoulli(A).rvs() ^ bernoulli(error_rate).rvs():
# new MCMC state
x_t = x_proposal
# start sampling after 30th proposal
if numQ>burn_in_time:
samples.append(x_proposal)
# MCMC samples and color components
samples = np.array(samples)
R,G,B = samples.T
# sample statistics on individual component distributions
print "Mean: ({0:.2f},{1:.2f},{2:.2f})".format(np.mean(R),np.mean(G),np.mean(B))
print "Std: ({0:.2f},{1:.2f},{2:.2f})".format(np.std(R),np.std(G),np.std(B))
def __init__(self, theta):
self._bernoulli = bernoulli(0.1)
self._theta = theta
import matplotlib.pyplot as plt
import csv
#Guardar datos en un list
with open('bits10k.csv', newline='') as csvfile:
data = list(csv.reader(csvfile))
bits = [0]*len(data)
for c in range(0,10000):
bits[c]=int(data[c][0])
# Número de bits
N = len(bits)
# Variable aleatoria binaria equiprobable
X = stats.bernoulli(0.5)
# Generar bits para "transmitir"
#bits = X.rvs(N)
'''
Punto 1
'''
# Frecuencia de operación
f = 5000 # Hz
# Duración del período de cada símbolo (onda)
T = 1/f # 1 ms
sigma = 0.5
norm_rv = sts.norm(loc=mu, scale=sigma)
x = norm_rv.rvs(size=4) # [2.42471807, 2.89001427, 1.5406754 , 2.218372]
# Generate uniform distribution
a = 1
b = 4
uniform_rv = sts.uniform(a, b - a)
x = uniform_rv.rvs(
size=4) # [2.90068986, 1.30900927, 2.61667386, 1.82853085]
# Generate Bernoulli distribution
p = 0.7
bernoulli_rv = sts.bernoulli(p)
x = bernoulli_rv.rvs(size=4) # [1, 1, 1, 0]
# Generate binomial distribution
n = 20
p = 0.7
binom_rv = sts.binom(n, p)
x = binom_rv.rvs(size=4) # [13, 15, 13, 14]
# Generate Poisson distribution
lam = 5
poisson_rv = sts.poisson(lam)
x = poisson_rv.rvs(size=4) # [6, 10, 4, 4]
x_t = (uniform().rvs(size=3) * 256).astype(int)
for numQ in range(120):
# draw sample from proposal distribution,
x_proposal = multivariate_normal(x_t, cov_prop).rvs().astype(int)
# resample from proposal distribution if out-of-bounds
while any(xi < 0 or xi > 255 for xi in x_proposal):
x_proposal = multivariate_normal(x_t, cov_prop).rvs().astype(int)
# accept with probability A(x_proposal,x_t)
A = targetdist.pdf(x_proposal) / (targetdist.pdf(x_proposal) +
targetdist.pdf(x_t))
# accept proposal
if bernoulli(A).rvs() ^ bernoulli(error_rate).rvs():
# new MCMC state
x_t = x_proposal
# start sampling after 30th proposal
if numQ > burn_in_time:
samples.append(x_proposal)
# MCMC samples and color components
samples = np.array(samples)
R, G, B = samples.T
# sample statistics on individual component distributions
print "Mean: ({0:.2f},{1:.2f},{2:.2f})".format(np.mean(R), np.mean(G),
np.mean(B))
print "Std: ({0:.2f},{1:.2f},{2:.2f})".format(np.std(R), np.std(G), np.std(B))
def make_sample(M=1000):
log = np.sum(bernoulli(p).rvs(size=[N, M]), axis=0)
return log
# Use a zero input and the fwd transform to get the shape of
# the pyramid easily
f_tf = Transform2d(biort=biort, qshift=qshift)
p_tf = f_tf.forward(im, nlevels=4, include_scale=True)
# Create ops for the inverse transform
X_tf = f_tf.inverse(p_tf)
np.testing.assert_array_almost_equal(
X_np, X_tf, decimal=PRECISION_DECIMAL)
@skip_if_no_tf
@pytest.mark.parametrize("biort,qshift,gain_mask", [
('antonini','qshift_c',stats.bernoulli(0.8).rvs(size=(6,4))),
('near_sym_a','qshift_a',stats.bernoulli(0.8).rvs(size=(6,4))),
('legall','qshift_c',stats.bernoulli(0.8).rvs(size=(6,4))),
('near_sym_b','qshift_06',stats.bernoulli(0.8).rvs(size=(6,4))),
('near_sym_b_bp', 'qshift_b_bp',stats.bernoulli(0.8).rvs(size=(6,4)))
])
def test_results_match_invmask(biort,qshift,gain_mask):
im = mandrill
f_np = Transform2d_np(biort=biort, qshift=qshift)
p_np = f_np.forward(im, nlevels=4, include_scale=True)
X_np = f_np.inverse(p_np, gain_mask)
f_tf = Transform2d(biort=biort, qshift=qshift)
p_tf = f_tf.forward(im, nlevels=4, include_scale=True)
X_tf = f_tf.inverse(p_tf, gain_mask)
def __init__(self, mu1, K1, p, mu2, K2):
assert (p > 0 and p < 1)
self.p = stats.bernoulli(p)
self.d1 = mvnorm(mu1, K1)
self.d2 = mvnorm(mu2, K2)
def generate(prob, nRow, nCol):
dist = stats.bernoulli(prob)
matrix = dist.rvs((nRow + 2, nCol))
matrix[0, :] = 1
matrix[nRow + 1, :] = 1
return matrix
def test_estimate_pauli_sum(qvm):
"""
Full test of the estimation procedures
"""
# type checks
with pytest.raises(TypeError):
estimate_pauli_sum('5', {0: 'X', 1: 'Z'}, Program(), 1.0E-3, qvm)
with pytest.raises(CommutationError):
estimate_pauli_sum([sX(0), sY(0)], {
0: 'X',
1: 'Z'
}, Program(), 1.0E-3, qvm)
with pytest.raises(TypeError):
estimate_pauli_sum(sX(0), {0: 'X', 1: 'Z'}, Program(), 1.0E-3, qvm)
# mock out qvm
np.random.seed(87655678)
brv1 = bernoulli(p=0.25)
brv2 = bernoulli(p=0.4)
n = 500
two_qubit_measurements = list(zip(brv1.rvs(size=n), brv2.rvs(size=n)))
pauli_terms = [sZ(0), sZ(1), sZ(0) * sZ(1)]
fakeQVM = Mock(spec=QVMConnection())
fakeQVM.run = Mock(return_value=two_qubit_measurements)
mean, means, cov, estimator_var, shots = estimate_pauli_sum(
pauli_terms, {
0: 'Z',
1: 'Z'
},
Program(),
1.0E-1,
fakeQVM,
symmetrize=False)
parity_results = np.zeros((len(pauli_terms), n))
parity_results[0, :] = [-2 * x[0] + 1 for x in two_qubit_measurements]
parity_results[1, :] = [-2 * x[1] + 1 for x in two_qubit_measurements]
parity_results[2, :] = [
-2 * (sum(x) % 2) + 1 for x in two_qubit_measurements
]
assert np.allclose(np.cov(parity_results, ddof=1), cov)
assert np.isclose(np.sum(np.mean(parity_results, axis=1)), mean)
assert np.allclose(np.mean(parity_results, axis=1), means)
assert np.isclose(shots, n)
variance_to_beat = np.sum(cov) / (n - 1)
assert np.isclose(variance_to_beat, estimator_var)
# Double the shots by ever so slightly decreasing variance bound
double_two_q_measurements = two_qubit_measurements + two_qubit_measurements
mean, means, cov, estimator_var, shots = estimate_pauli_sum(
pauli_terms, {
0: 'Z',
1: 'Z'
},
Program(),
variance_to_beat - 1.0E-8,
fakeQVM,
symmetrize=False)
parity_results = np.zeros((len(pauli_terms), 2 * n))
parity_results[0, :] = [-2 * x[0] + 1 for x in double_two_q_measurements]
parity_results[1, :] = [-2 * x[1] + 1 for x in double_two_q_measurements]
parity_results[2, :] = [
-2 * (sum(x) % 2) + 1 for x in double_two_q_measurements
]
assert np.allclose(np.cov(parity_results, ddof=1), cov)
assert np.isclose(np.sum(np.mean(parity_results, axis=1)), mean)
assert np.allclose(np.mean(parity_results, axis=1), means)
assert np.isclose(shots, 2 * n)
assert np.isclose(np.sum(cov) / (2 * n - 1), estimator_var)
def __init__(self, p):
self.p = p
self.noise_distr = bernoulli(p)
def testBernoulli():
from scipy.stats import bernoulli
#bernoulli random variable
brv=bernoulli(p=0.3)
sample = brv.rvs(size=20)
print(sample)
def getBanditArms(numArms):
armMeans = np.random.rand(numArms)
banditArms = [bernoulli(armMeans[i]) for i in range(numArms)]
return banditArms
def sample(self, x, random_state=None):
import scipy.stats as st
p = self.mean(x)
return _aca(st.bernoulli(p).rvs(random_state=random_state))
def __new__(cls, jax_dist, *params):
sp_dist = None
if jax_dist in _DIST_MAP:
sp_dist = _DIST_MAP[jax_dist]
return super(cls, T).__new__(cls, jax_dist, sp_dist, params)
def _mvn_to_scipy(loc, cov, prec, tril):
jax_dist = dist.MultivariateNormal(loc, cov, prec, tril)
mean = jax_dist.mean
cov = jax_dist.covariance_matrix
return osp.multivariate_normal(mean=mean, cov=cov)
_DIST_MAP = {
dist.BernoulliProbs: lambda probs: osp.bernoulli(p=probs),
dist.BernoulliLogits: lambda logits: osp.bernoulli(p=_to_probs_bernoulli(logits)),
dist.Beta: lambda con1, con0: osp.beta(con1, con0),
dist.BinomialProbs: lambda probs, total_count: osp.binom(n=total_count, p=probs),
dist.BinomialLogits: lambda logits, total_count: osp.binom(n=total_count, p=_to_probs_bernoulli(logits)),
dist.Cauchy: lambda loc, scale: osp.cauchy(loc=loc, scale=scale),
dist.Chi2: lambda df: osp.chi2(df),
dist.Dirichlet: lambda conc: osp.dirichlet(conc),
dist.Exponential: lambda rate: osp.expon(scale=np.reciprocal(rate)),
dist.Gamma: lambda conc, rate: osp.gamma(conc, scale=1./rate),
dist.HalfCauchy: lambda scale: osp.halfcauchy(scale=scale),
dist.HalfNormal: lambda scale: osp.halfnorm(scale=scale),
dist.LogNormal: lambda loc, scale: osp.lognorm(s=scale, scale=np.exp(loc)),
dist.MultinomialProbs: lambda probs, total_count: osp.multinomial(n=total_count, p=probs),
dist.MultinomialLogits: lambda logits, total_count: osp.multinomial(n=total_count,
p=_to_probs_multinom(logits)),
### Distribuciones de probabilidad ## Distribucion de Bernoulli from scipy import stats p = 0.5 bernoulliDist = stats.bernoulli(p) p_tails = bernoulliDist.pmf(0) p_heads = bernoulliDist.pmf(1) print(p_tails, p_heads) #Generacion de Aleatorios trials = bernoulliDist.rvs(10) print(trials) ## Distribucion Binomial (p, num) = (0.5, 4) binomDist = stats.binom(num, p) print(binomDist.pmf(np.arange(5))) ## Distribucion Normal from scipy.stats import norm # Generacion de distribucion
KFold)
from numpy.testing import assert_array_equal, assert_array_almost_equal
import numpy.testing as npt
import nose.tools
from nose.tools import assert_equal, raises
from .. import mvpa
evs = [np.array([[6, 0, 1],
[18, 0, 1]]),
np.array([[12, 0, 1],
[24, 0, 1]])]
dataset = dict(X=stats.norm(0, 1).rvs((24, 12)),
y=stats.bernoulli(.5).rvs(24),
runs=np.repeat([0, 1], 12))
dataset_3d = dict(X=stats.norm(0, 1).rvs((4, 24, 12)),
y=stats.bernoulli(.5).rvs(24),
runs=np.repeat([0, 1], 12))
def test_extract_dataset():
"""Test simple case."""
evs = pd.DataFrame(dict(onset=[1, 2, 3],
condition=["foo", "foo", "bar"]),
dtype=float)
ts = np.random.randn(5, 5, 5, 4)
mask = ts[..., 0] > .5
X, y, m = mvpa.extract_dataset(evs, ts, mask, 1)
plt.ylabel('$F(x)$')
plt.xlabel('$x$')
x = np.linspace(0, 5, 1000)
pdf = uniform_rv.pdf(x)
plt.plot(x, pdf)
plt.ylabel('$f(x)$')
plt.xlabel('$x$')
# распределение Бернулли
# https://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.bernoulli.html
bernoulli_rv = sts.bernoulli(0.7)
b = bernoulli_rv.rvs(300)
print(abs(np.sum(b) - 300 * 0.7) / 300)
# биномиальное распределение
# https://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.binom.html
binomial_rv = sts.binom(20, 0.9)
x = np.linspace(0, 20, 21)
cdf = binomial_rv.cdf(x)
plt.step(x, cdf)
rearr = lambda arr: np.moveaxis(arr, [0, 1, 2, 3, 4], [0, 4, 1, 2, 3])
rearry = lambda arr: np.moveaxis(arr, [0, 1, 2, 3, 4], [0, 4, 1, 2, 3]
)[:, :, :, :, :1]
X = rearr(x_test)
Y = rearry(y_test)
return model.keras_model.evaluate(X, Y, batch_size=batch_size)[1]
DEFAULT_DIST = {
'n_spheres_dist': norm(loc=120, scale=5),
'n_cubes_dist': norm(loc=0, scale=0),
'n_cylinders_dist': norm(loc=18, scale=5),
'psf_lateral_sigma_dist': uniform(loc=0, scale=1),
'psf_axial_sigma_dist': uniform(loc=0.5, scale=4),
'use_poisson_dist': bernoulli(0.75),
'subsample_factor_dist': uniform(loc=0.5, scale=0.5),
'gauss_noise_sigma_dist': uniform(loc=0, scale=0.42)
}
def gen_model_eval_data(params: Dict[str, Union[List[float], np.ndarray]],
shape: int,
use_noise: bool,
use_psf: bool,
use_subsampling: bool,
samples_per_param: int = 18,
dists=DEFAULT_DIST):
"""
Analyze how the performance of a CARE model is affected by different parameters of degradation and image content
#!/usr/bin/env python
"""stats_bernoulli.py: Demonstrate how ``scipy.stats.bernoulli`` works.
"""
from scipy.stats import bernoulli
# pylint: disable=invalid-name
# Let p be the probability of the coin landing heads.
p = 0.5
rv = bernoulli(p)
# Compute moments.
mean, var, skew, kurt = rv.stats(moments='mvsk')
# mean == p.
print(f"mean: {float(mean):.3f}")
# median == 0.5 (if p == 0.5)
print(f"median: {rv.median():.3f}")
# var == p * (1 - p)
print(f"var: {float(var):.3f}")
# skew == (1 - 2 * p)/np.sqrt(p * (1 - p))
print(f"skew: {float(skew):.3f}")
# kurt == -2 (if p == 0.5)
print(f"kurt: {float(kurt):.3f}")
# std == np.sqrt(var)
print(f"std: {rv.std():.3f}")
np.set_printoptions(formatter={'all':lambda x: '%.3f' % x})
# https://people.duke.edu/~ccc14/sta-663/EMAlgorithm.html
##################### complete information #######################################
# https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.stats.binom.html
def neg_loglik(thetas, n, xs, zs):
return -np.sum([binom(n, thetas[z]).logpmf(x) for (x, z) in zip(xs, zs)])
m = 10
theta_A = 0.8
theta_B = 0.3
theta_0 = [theta_A, theta_B]
# https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.stats.bernoulli.html
coin_A = bernoulli(theta_A)
coin_B = bernoulli(theta_B)
# A,A,B,A,B.
xs = map(sum, [coin_A.rvs(m), coin_A.rvs(m), coin_B.rvs(m), coin_A.rvs(m), coin_B.rvs(m)])
zs = [0, 0, 1, 0, 1]
xs = np.array(xs)
print 'xs=',xs
ml_A = np.sum(xs[[0,1,3]])/(3.0*m)
ml_B = np.sum(xs[[2,4]])/(2.0*m)
print 'ml_A,ml_B:',ml_A, ml_B
bnds = [(0,1), (0,1)]
# https://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.minimize.html
#!/usr/bin/python3
# import libraries
import pymc3 as pm
from scipy import stats
import matplotlib.pyplot as plt
# this is PyMC3 notation
# essentially model initialisation in PyMC3 is done into the model fitting portion of the
# code and there is no model building as in PyMC2
with pm.Model() as trafficLight_model:
# define our data - PyMC3 does not like map objects
data = stats.bernoulli(0.2).rvs(100000)
# similar as in PyMC2
theta = pm.Beta("theta", alpha=1.0, beta=1.0)
# "observed" replaces "value"
color = pm.Bernoulli("color", p=theta, observed=data)
# define iteration start
start = pm.find_MAP()
# MCMC in PyMC3
step = pm.Metropolis()
trace = pm.sample(1e4, start=start, step=step, model=trafficLight_model)
# show our amazing results
pm.traceplot(trace[0:])
plt.show()
def test(n=100, p=0.7):
'''
bernoulli distribution
n - розмір вибірки
p - ймовірність одиниці
Повертає список вигляду [згенерована вибірка, список x, список y, середнє, мода, медіана,
розмах, девіація, варіанса, стандарт, варіація, асиметрія, ексцес]
'''
distribution = st.bernoulli(p)
sample = list(distribution.rvs(size=n))
for i in range(len(sample)):
sample[i] = round(sample[i], 2)
var = list(sample)
var.sort()
x = list(set(sample))
y = list()
x.sort()
freq_table = dict()
for num in x:
freq_table[num] = sample.count(num)
int_len = ((max(sample) - min(sample)) / r(sample))
int_bounds = list()
next = min(sample)
for i in range(r(sample)):
int_bounds.append(round(next, 2))
next += int_len
int_bounds.append(max(sample))
freq_table = dict()
int_list = list()
for i in range(len(int_bounds) - 1):
int_list.append([int_bounds[i], int_bounds[i + 1]])
for i in range(len(int_list)):
if i != len(int_list) - 1:
freq_table["[" + str(int_list[i][0]) + "; " + str(int_list[i][1]) +
")"] = 0
else:
freq_table["[" + str(int_list[i][0]) + "; " + str(int_list[i][1]) +
"]"] = 0
for i in range(len(sample)):
for j in range(len(int_list)):
if sample[i] >= int_list[j][0] and sample[i] < int_list[j][
1] and j != len(int_list) - 1:
freq_table["[" + str(int_list[j][0]) + "; " +
str(int_list[j][1]) + ")"] += 1
elif sample[i] >= int_list[j][0] and sample[i] <= int_list[j][
1] and j == len(int_list) - 1:
freq_table["[" + str(int_list[j][0]) + "; " +
str(int_list[j][1]) + "]"] += 1
int_list_values = list()
for key in freq_table:
int_list_values.append(int(freq_table[key]))
intr = list(freq_table.keys())
centered_int = list()
for intr in int_list:
centered_int.append(round(((intr[0] + intr[1]) / 2), 3))
freq_table_disc = dict()
x = list(set(sample))
for num in x:
freq_table_disc[num] = sample.count(num)
result = list()
result.append(sample)
x = [0, 1]
y = [1 - p, p]
result.append(x)
result.append(y)
mean = np.mean(sample)
result.append(mean)
moda = list(mode(freq_table_disc).keys())
result.append(moda)
med = statistics.median(sample)
result.append(med)
ro = max(sample) - min(sample)
result.append(ro)
deviation = dev(freq_table_disc)
result.append(deviation)
variansa = dev(freq_table_disc) / (len(sample) - 1)
result.append(variansa)
standart = math.sqrt(variansa)
result.append(standart)
variation = standart / np.mean(sample)
asym = st.skew(sample)
result.append(asym)
ex = st.kurtosis(sample)
result.append(ex)
return result
# -*- coding: utf-8 -*-
"""
Created on Sun Dec 8 11:41:19 2019
@author: Yao
"""
from scipy.stats import bernoulli
p = 1.0/2 #需要估计的目标
sample = bernoulli(p)
xs = sample.rvs(100) #生成100个样本
print(xs[:10]) #查看前10个生成样本
import sympy
import numpy as np
x, p, z = sympy.symbols('x p z', positive = True)
phi = p ** x * (1-p) ** (1-x)
L = np.prod([phi.subs(x,i)for i in xs])
print(L)
logL = sympy.expand_log(sympy.log(L))
print(logL)
sol, = sympy.solve(sympy.diff(logL, p),p) #求解
print(sol)