def __init__(self, tilt):
super(MySource, self).__init__(tilt)
#not much to do here
self.stddev = 0.0033 / 3
self.mean = tilt
self.anggenerator = norm(loc=self.mean, scale=self.stddev)
#make a pdf based on the sum-of-four-lorentzians
ka11 = cauchy(loc=8047.837, scale=2.285)
ka12 = cauchy(loc=8045.637, scale=3.358)
ka21 = cauchy(loc=8027.994, scale=2.667)
ka22 = cauchy(loc=8026.504, scale=3.571)
#noinspection PyMethodOverriding
class kadist(rv_continuous):
def _pdf(self, x):
return (0.957 * ka11.pdf(x) + 0.090 * ka12.pdf(x) +
0.334 * ka21.pdf(x) + 0.111 * ka22.pdf(x)) / 1.492
def _cdf(self, x):
return (0.957 * ka11.cdf(x) + 0.090 * ka12.cdf(x) +
0.334 * ka21.cdf(x) + 0.111 * ka22.cdf(x)) / 1.492
self.egenerator = kadist()
def main():
# Define our test distribution: a mix of Cauchy-distributed variables
np.random.seed(0)
x = np.concatenate([stats.cauchy(-5, 1.8).rvs(500),
stats.cauchy(-4, 0.8).rvs(2000),
stats.cauchy(-1, 0.3).rvs(500),
stats.cauchy(2, 0.8).rvs(1000),
stats.cauchy(4, 1.5).rvs(500)])
# truncate values to a reasonable range
x = x[(x > -15) & (x < 15)]
pl.figure()
pl.hist(x, bins=10, normed=True)
# Histogram with more bins,
pl.figure()
pl.hist(x, bins=100, normed=True)
pl.figure()
# plot a standard histogram in the background, with alpha transparency
pl.hist(x, bins=200, histtype='stepfilled', alpha=0.2, normed=True)
# plot an adaptive-width histogram on top
pl.hist(x, bins=bayesian_blocks(x), color='black', histtype='step', normed=True)
pl.show()
def cauchyNumbers():
for size in sizes:
fig, ax = plt.subplots(1, 1)
ax.hist(cauchy.rvs(size=size), histtype='stepfilled', alpha=0.5, color='blue', density=True)
x = np.linspace(cauchy().ppf(0.01), cauchy().ppf(0.99), 100)
ax.plot(x, cauchy().pdf(x), '-')
ax.set_title('CauchyNumbers n = ' + str(size))
ax.set_xlabel('CauchyNumbers')
ax.set_ylabel('density')
plt.grid()
plt.show()
return
def dataY(k, l):
if k == 1:
return scs.norm(0, l).pdf(dataX(k))
if k == 2:
return scs.norm(0, l).cdf(dataX(k))
if k == 3:
return scs.cauchy().pdf(dataX(k))
if k == 4:
return scs.cauchy().cdf(dataX(k))
if k == 5:
return scs.gamma(l).pdf(dataX(k))
if k == 6:
return scs.gamma(l).cdf(dataX(k))
def __init__(self,
sad_h5_file,
sad_key="SAD",
compute_norm=True,
recompute_norm=False):
self.sad_h5_file = sad_h5_file
self.sad_h5_open = h5py.File(self.sad_h5_file, "r")
self.sad_matrix = self.sad_h5_open[sad_key]
self.num_snps, self.num_targets = self.sad_matrix.shape
self.target_ids = np.array(
[tl.decode("UTF-8") for tl in self.sad_h5_open["target_ids"]])
self.target_labels = np.array(
[tl.decode("UTF-8") for tl in self.sad_h5_open["target_labels"]])
# read SAD percentile indexes into memory
self.pct_sad = np.array(self.sad_h5_open["SAD_pct"])
# read percentiles
self.percentiles = np.around(self.sad_h5_open["percentiles"], 3)
self.percentiles = np.append(self.percentiles, self.percentiles[-1])
if compute_norm:
# fit, if not present
if recompute_norm or not "target_cauchy_fit_loc" in self.sad_h5_open:
self.fit_cauchy()
# make target-specific fit cauchy's
target_cauchy_fit_params = zip(
self.sad_h5_open["target_cauchy_fit_loc"],
self.sad_h5_open["target_cauchy_fit_scale"],
)
self.target_cauchy_fit = [
cauchy(*cp) for cp in target_cauchy_fit_params
]
# choose normalizing values, if not present
if recompute_norm or not "target_cauchy_norm_loc" in self.sad_h5_open:
self.norm_cauchy()
# make target-specific normalizing cauchy's
target_cauchy_norm_params = zip(
self.sad_h5_open["target_cauchy_norm_loc"],
self.sad_h5_open["target_cauchy_norm_scale"],
)
self.target_cauchy_norm = [
cauchy(*cp) for cp in target_cauchy_norm_params
]
def get_characteristic(distrib, n):
if distrib == "Standard normal":
x_sample = st.norm(0, 1)
elif distrib == "Uniform":
x_sample = st.uniform(loc=-3 ** 0.5, scale=2 * (3 ** 0.5))
elif distrib == "Cauchy":
x_sample = st.cauchy(loc=0, scale=1)
elif distrib == "Laplace":
x_sample = st.laplace(loc=0, scale=(2 ** (-0.5)))
elif distrib == "Poisson":
x_sample = st.poisson(mu=7)
else:
x_sample = np.ndarray(shape=(1, n))
result = defaultdict(list)
for k in range(1000):
x_n = x_sample.rvs(n)
result["sample_mean"].append(np.mean(x_n))
result["med"].append(np.median(x_n))
result["range"].append((np.amax(x_n) + np.amin(x_n)) / 2)
result["quart_range"].append(quartile_range(x_n, n))
result["trunc_mean"].append(trunc_mean(x_n, n))
return result
def ajuste_lorentz(x, a, b, A, mu, sigma):
'''
ajuste de una recta menos una perfil de lorentz, los parametros (a,b)
pertenecen a la recta y los paramatros (A, mu, sigma) al perfil de lorentz
'''
y = (a + b * x) - A * scist.cauchy(loc=mu, scale=sigma).pdf(x)
return y
def __init__(self, m_latent, b_latent, sigma):
self._sigma = sigma
self._dist = stats.cauchy(scale=sigma, loc=0)
super(CauchyData, self).__init__(m_latent, b_latent)
def Modelo_lorentz(x, a, b, A, mu, sigma):
"""
entrega valores de la funcion del modelo lorentziano evaluada en punto
o set de puntos
"""
f = (a*x + b) - A * stats.cauchy(loc=mu, scale=sigma).pdf(x)
return f
def adjust_noise(optimizer, epoch, args, noise_dict):
keys = list(noise_dict.keys())
keys.sort()
select = keys[0]
for k in keys:
select = k
if k > epoch:
break
if args.noisemodel == 'johnson':
noise_model = st.johnsonsu(*noise_dict[select])
if args.noisemodel == 'gaussian':
print("GAUSSIAN NOISE set")
noise_model = st.norm(*noise_dict[select])
if args.noisemodel == 'laplace':
noise_model = st.laplace(*noise_dict[select])
if args.noisemodel == 'cauchy':
noise_model = st.cauchy(*noise_dict[select])
if args.noisemodel == 'gennorm':
noise_model = st.gennorm(*noise_dict[select])
if args.noisemodel == 'studentt':
noise_model = st.t(*noise_dict[select])
print('noise model is', args.noisemodel, noise_dict[select])
optimizer.noise_generator = noise_model
def get_functions():
rv_n = norminvgauss(1, 0)
rv_l = laplace(scale=1 / m.sqrt(2), loc=0)
rv_p = poisson(10)
rv_c = cauchy()
rv_u = uniform(loc=-m.sqrt(3), scale=2 * m.sqrt(3))
return [rv_n, rv_l, rv_p, rv_c, rv_u]
def cauchy_CLT(outer_n=100, inner_n=20, density=False, showMe=False):
dist = stats.cauchy()
f = plt.figure(figsize=(20, 10))
ax1 = f.add_subplot(121)
ax2 = f.add_subplot(122)
x1 = np.linspace(dist.ppf(0.01), dist.ppf(0.99), 100)
ax1.plot(x1, dist.pdf(x1))
n_bins = int(np.log10(outer_n) * 50)
x_bar = np.array([np.mean(dist.rvs(size=inner_n)) for i in range(outer_n)])
if not density:
ax2.hist(x_bar, bins=n_bins, normed=True, label='sample means')
else:
sns.kdeplot(x_bar, ax=ax2, shade=True, label='sample means')
if not showMe:
x = np.linspace(stats.norm.ppf(0.001), stats.norm.ppf(0.999), 100)
ax2.plot(x, stats.norm.pdf(x), color='black', label='standard normal')
else:
ax2.plot(x1, dist.pdf(x1), label='Cauchy')
ax2.legend()
sns.despine(fig=f, trim=True)
plt.show()
def testCauchyLogPDFMultidimensional(self):
batch_size = 6
loc = tf.constant([[3.0, -3.0]] * batch_size, dtype=tf.float32)
scale = tf.constant([[
np.sqrt(10.0, dtype=np.float32),
np.sqrt(15.0, dtype=np.float32)
]] * batch_size)
x = np.array([[-2.5, 2.5, 4.0, 0.0, -1.0, 2.0]], dtype=np.float32).T
cauchy = tfd.Cauchy(loc=loc, scale=scale, validate_args=True)
log_pdf = cauchy.log_prob(x)
log_pdf_values = self.evaluate(log_pdf)
self.assertEqual(log_pdf.shape, (6, 2))
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
log_pdf.shape)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
self.evaluate(log_pdf).shape)
self.assertAllEqual(cauchy.batch_shape, log_pdf.shape)
self.assertAllEqual(cauchy.batch_shape, self.evaluate(log_pdf).shape)
pdf = cauchy.prob(x)
pdf_values = self.evaluate(pdf)
self.assertEqual(pdf.shape, (6, 2))
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
pdf.shape)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
pdf_values.shape)
self.assertAllEqual(cauchy.batch_shape, pdf.shape)
self.assertAllEqual(cauchy.batch_shape, pdf_values.shape)
expected_log_pdf = sp_stats.cauchy(self.evaluate(loc),
self.evaluate(scale)).logpdf(x)
self.assertAllClose(expected_log_pdf, log_pdf_values)
self.assertAllClose(np.exp(expected_log_pdf), pdf_values)
def ajuste_lorentz(x, a, b, A, mu, sigma):
'''
ajuste de una recta menos una perfil de lorentz, los parametros (a,b)
pertenecen a la recta y los paramatros (A, mu, sigma) al perfil de lorentz
'''
y = (a + b * x) - A * scist.cauchy(loc=mu, scale=sigma).pdf(x)
return y
def testCauchyLogPDF(self):
batch_size = 6
loc = tf.constant([3.0] * batch_size)
scale = tf.constant([np.sqrt(10.0, dtype=np.float32)] * batch_size)
x = np.array([-2.5, 2.5, 4.0, 0.0, -1.0, 2.0], dtype=np.float32)
cauchy = tfd.Cauchy(loc=loc, scale=scale, validate_args=True)
log_pdf = cauchy.log_prob(x)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
log_pdf.shape)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
self.evaluate(log_pdf).shape)
self.assertAllEqual(cauchy.batch_shape, log_pdf.shape)
self.assertAllEqual(cauchy.batch_shape, self.evaluate(log_pdf).shape)
pdf = cauchy.prob(x)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
pdf.shape)
self.assertAllEqual(self.evaluate(cauchy.batch_shape_tensor()),
self.evaluate(pdf).shape)
self.assertAllEqual(cauchy.batch_shape, pdf.shape)
self.assertAllEqual(cauchy.batch_shape, self.evaluate(pdf).shape)
expected_log_pdf = sp_stats.cauchy(self.evaluate(loc),
self.evaluate(scale)).logpdf(x)
self.assertAllClose(expected_log_pdf, self.evaluate(log_pdf))
self.assertAllClose(np.exp(expected_log_pdf), self.evaluate(pdf))
def __init__(self, loc=0, scale=1):
super(Cauchy, self).__init__()
self._distr = stats.cauchy(loc=loc, scale=scale)
self._loc = loc
self._scale = scale
self._lower_bound = 0
self._upper_bound = 1.5 / (math.pi * self._scale)
def __init__(self, seed=42, num_inputs=11, kind='chisq', balance=0.5, noise='gauss', spread=0.1):
"""
Initialize the instance
:param seed: Int. The seed for the numpy random state.
:param num_inputs: Int. Number of inputs in the input vector of each event.
:param kind: String. Type of event stream to generate.
:param balance: Float between 0. and 1.0. Fraction of the 0 class in the event stream
:param noise: String. One of gaussian, uniform
:param spread: Float. Spread of the noise in terms of percentiles of the
:return:
"""
assert isinstance(seed, int)
assert isinstance(num_inputs, int)
assert kind in ('chisq', 'cauchy')
assert noise in ('gauss', 'uniform')
assert isinstance(balance, float)
assert (balance >= 0.) and (balance <= 1.)
self.seed = seed
np.random.seed(seed)
self.num_inputs = num_inputs
self.kind = kind
if kind == 'chisq':
self.cutoff = chi2.isf(balance, df=num_inputs)
self.spread = (chi2.isf(balance + spread/2., df=num_inputs) -
chi2.isf(balance - spread/2., df=num_inputs))
elif kind == 'cauchy':
assert (self.num_inputs % 2 == 0) # only implemented for even number of inputs
self.cauchy = cauchy(0., np.sqrt(self.num_inputs)/np.pi)
self.cutoff = self.cauchy.isf(balance)
self.spread = self.cauchy.isf(balance - spread/2.) - self.cauchy.isf(balance + spread/2.)
print 'spread', self.spread
self.noise = noise
def distributions():
return [
norm(loc=0, scale=1),
laplace(scale=1 / numpy.sqrt(2), loc=0),
poisson(10),
cauchy(),
uniform(loc=-numpy.sqrt(3), scale=2 * numpy.sqrt(3))
]
def drawCauchy(size):
fc = cauchy(0, 1)
x = np.linspace(fc.ppf(0.01), fc.ppf(0.99), 1000)
plt.plot(x, fc.pdf(x), 'k', lw=2)
bins = fc.rvs(size=size)
plt.tight_layout()
sb.histplot(bins, stat="density", alpha=0.5, color="blue")
def cell1():
grid = np.linspace(-5, 5, 1000).reshape((-1, 1))
draw_likelihood(sps.norm(loc=grid).pdf, grid, [[-1, 1], [-5, 5], [-1, 5]], '$\\mathcal{N}(\\theta, 1)$')
draw_likelihood(sps.expon(loc=grid).pdf, grid, [[1, 2], [0.1, 1], [1, 10]], '$Exp(\\theta)$')
draw_likelihood(sps.uniform(scale=grid).pdf, grid, [[0.2, 0.8], [0.5, 1], [0.5, 1.3]], '$U[0, \\theta]$')
draw_likelihood(sps.binom(n=5, p=grid).pmf, grid, [[0, 1], [5, 5], [0, 5]], '$Bin(5, \\theta)$')
draw_likelihood(sps.poisson(mu=grid).pmf, grid, [[0, 1], [0, 10], [5, 10]], '$Pois(\\theta)$')
draw_likelihood(sps.cauchy(loc=grid).pdf, grid, [[-0.5, 0.5], [-2, 2], [-4, 0, 4]], '$Сauchy(\\theta)$')
def make_sing_multtrip(nu_max): import numpy as np import pandas as pd from scipy.stats import norm from scipy.stats import cauchy freqs=np.arange(1800,4000,4) N=freqs.size lp=cauchy(0).pdf(np.arange(-1,1,1./2)) offset=30 other_mode=25 arr=np.where(nu_max==freqs) i=arr[0] #act_offset=np.random.randint(10,high=20) #for i in range(offset+lp.size+5,N-lp.size-5-offset): #act_offset=np.random.randint(0,high=20) act_offset=8#fixed distance spec=np.zeros(N) spec[i-lp.size/2:i+lp.size/2]=2*lp pos=np.arange(i-lp.size/2,i+lp.size/2) pos_off=pos-act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. pos_off=pos+act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. pos=np.arange(i-lp.size/2,i+lp.size/2) pos+=other_mode spec[pos]=2*lp pos_off=pos-act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. pos_off=pos+act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. pos=np.arange(i-lp.size/2,i+lp.size/2) pos-=other_mode spec[pos]=2*lp spec[i-lp.size-5:i-5]=1*lp # pos=0. # pos=np.arange(i-lp.size-5,i-5,1) pos_off=pos-act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. pos_off=pos+act_offset spec[pos_off]=0.5*spec[pos] pos_off=0. # spec[pos]=0 #act_offset=np.random.randint(0,high=20) #act_offset=5#fixed distance rand_noise=np.random.random(N)*np.random.randint(1,high=2) sig=spec sig/=np.max(sig) sig_noise=spec+rand_noise sig_noise/=np.max(sig_noise) return(sig,sig_noise)
class DistHandler:
"""
Class handles five distributions:
Normal(0, 1),
Cauchy(0, 1),
Laplace(0, 1/sqrt(2)),
Poisson(10),
Uniform(-sqrt(3), sqrt(3))
"""
distributions = {
'Normal': ss.norm(loc=0, scale=1),
'Cauchy': ss.cauchy(loc=0, scale=1),
'Laplace': ss.laplace(loc=0, scale=1. / sqrt(2.)),
'Poisson': ss.poisson(mu=10),
'Uniform': ss.uniform(loc=-sqrt(3.), scale=2 * sqrt(3.))
}
@staticmethod
def get_sample(dist_name, n, with_random_seed=False):
dist = DistHandler.distributions[dist_name]
if with_random_seed:
return dist.rvs(n, random_state=RANDOM_SEED)
return dist.rvs(n)
@staticmethod
def get_pdf_data(sample, dist_name, bounds=None, n_splits=1000):
dist = DistHandler.distributions[dist_name]
sample_min = sample.min()
sample_max = sample.max()
if dist_name == 'Poisson':
x = np.arange(sample_max + 1) if not bounds else np.arange(*bounds)
y = dist.pmf(x)
else:
x = np.linspace(sample_min, sample_max,
n_splits) if not bounds else np.linspace(
*bounds, n_splits)
y = dist.pdf(x)
return x, y
@staticmethod
def get_cdf_data(sample, dist_name, linspace_params, n_splits=1000):
dist = DistHandler.distributions[dist_name]
if dist_name == 'Poisson':
x = np.linspace(*linspace_params, n_splits)
y = dist.cdf(x)
else:
x = np.linspace(*linspace_params, n_splits)
y = dist.cdf(x)
return x, y
def test_pdf():
"""
Test pdf.
"""
cauchy_benchmark = stats.cauchy(np.array([3.0]), np.array([[2.0], [4.0]]))
expect_pdf = cauchy_benchmark.pdf([1.0, 2.0]).astype(np.float32)
pdf = Prob()
output = pdf(Tensor([1.0, 2.0], dtype=dtype.float32))
tol = 1e-6
assert (np.abs(output.asnumpy() - expect_pdf) < tol).all()
def test_log_cdf():
"""
Test log cdf.
"""
cauchy_benchmark = stats.cauchy(np.array([3.0]), np.array([[2.0], [4.0]]))
expect_logcdf = cauchy_benchmark.logcdf([1.0, 2.0]).astype(np.float32)
logcdf = LogCDF()
output = logcdf(Tensor([1.0, 2.0], dtype=dtype.float32))
tol = 5e-5
assert (np.abs(output.asnumpy() - expect_logcdf) < tol).all()
def test_log_survival():
"""
Test log_survival.
"""
cauchy_benchmark = stats.cauchy(np.array([3.0]), np.array([[2.0], [4.0]]))
expect_log_survival = cauchy_benchmark.logsf([1.0, 2.0]).astype(np.float32)
log_survival = LogSF()
output = log_survival(Tensor([1.0, 2.0], dtype=dtype.float32))
tol = 2e-5
assert (np.abs(output.asnumpy() - expect_log_survival) < tol).all()
def test_log_likelihood():
"""
Test log_pdf.
"""
cauchy_benchmark = stats.cauchy(np.array([3.0]), np.array([[2.0], [4.0]]))
expect_logpdf = cauchy_benchmark.logpdf([1.0, 2.0]).astype(np.float32)
logprob = LogProb()
output = logprob(Tensor([1.0, 2.0], dtype=dtype.float32))
tol = 1e-6
assert (np.abs(output.asnumpy() - expect_logpdf) < tol).all()
def __init__(self, tilt):
super(Monoangle, self).__init__(tilt)
self.tilt = tilt
#make a pdf based on the sum-of-four-lorentzians
ka11 = cauchy(loc=8047.837, scale=2.285)
ka12 = cauchy(loc=8045.637, scale=3.358)
ka21 = cauchy(loc=8027.994, scale=2.667)
ka22 = cauchy(loc=8026.504, scale=3.571)
#noinspection PyMethodOverriding
class kadist(rv_continuous):
def _pdf(self, x):
return (0.957 * ka11.pdf(x) + 0.090 * ka12.pdf(x) + 0.334 * ka21.pdf(x) + 0.111 * ka22.pdf(x)) / 1.492
def _cdf(self, x):
return (0.957 * ka11.cdf(x) + 0.090 * ka12.cdf(x) + 0.334 * ka21.cdf(x) + 0.111 * ka22.cdf(x)) / 1.492
self.egenerator = kadist()
def __init__(self, location=None, scale=None):
self.location = location
self.scale = scale
self.bounds = np.array([-np.inf, np.inf])
self.skewness = np.nan
self.kurtosis = np.nan
if self.scale is not None:
self.x_range_for_pdf = np.linspace(-15*self.scale, 15*self.scale, RECURRENCE_PDF_SAMPLES)
self.parent = cauchy(loc=self.location, scale=self.scale)
self.mean = np.mean(self.get_samples(m=1000))
self.variance = np.var(self.get_samples(m=1000))
def __init__(self, n_dimensions, mean, scale, cov=0):
# "mean"
self.n_dimensions = n_dimensions
self.mean = mean
self.scale = scale
self.cov = cov
if self.cov == 0:
# independent
self.dist = stats.cauchy([self.mean] * self.n_dimensions, [self.scale] * self.n_dimensions)
else:
raise NotImplementedError
def __init__(self, tilt):
super(Monoangle, self).__init__(tilt)
self.tilt = tilt
#make a pdf based on the sum-of-four-lorentzians
ka11 = cauchy(loc=8047.837, scale=2.285)
ka12 = cauchy(loc=8045.637, scale=3.358)
ka21 = cauchy(loc=8027.994, scale=2.667)
ka22 = cauchy(loc=8026.504, scale=3.571)
#noinspection PyMethodOverriding
class kadist(rv_continuous):
def _pdf(self, x):
return (0.957 * ka11.pdf(x) + 0.090 * ka12.pdf(x) +
0.334 * ka21.pdf(x) + 0.111 * ka22.pdf(x)) / 1.492
def _cdf(self, x):
return (0.957 * ka11.cdf(x) + 0.090 * ka12.cdf(x) +
0.334 * ka21.cdf(x) + 0.111 * ka22.cdf(x)) / 1.492
self.egenerator = kadist()
def Cauchy(self):
rv = sts.cauchy()
# Генерируем выборку на основе массива, определенного в конструкторе
cdf = rv.cdf(self.arr)
print('Массив величин распределенных по закону распределения Коши: \n',
cdf)
plt.title('Распределение Коши')
plt.plot(self.arr, cdf)
plt.ylabel('$F(x)$')
plt.xlabel('$x$')
plt.grid(True)
plt.show()
def __init__(self, tilt):
super(MySource, self).__init__(tilt)
#not much to do here
self.stddev = 0.0033/3
self.mean = tilt
self.anggenerator = norm(loc=self.mean, scale=self.stddev)
#make a pdf based on the sum-of-four-lorentzians
ka11 = cauchy(loc=8047.837, scale=2.285)
ka12 = cauchy(loc=8045.637, scale=3.358)
ka21 = cauchy(loc=8027.994, scale=2.667)
ka22 = cauchy(loc=8026.504, scale=3.571)
#noinspection PyMethodOverriding
class kadist(rv_continuous):
def _pdf(self, x):
return (0.957 * ka11.pdf(x) + 0.090 * ka12.pdf(x) + 0.334 * ka21.pdf(x) + 0.111 * ka22.pdf(x)) / 1.492
def _cdf(self, x):
return (0.957 * ka11.cdf(x) + 0.090 * ka12.cdf(x) + 0.334 * ka21.cdf(x) + 0.111 * ka22.cdf(x)) / 1.492
self.egenerator = kadist()
def Cauchy():
for s in size:
density = cauchy()
histogram = cauchy.rvs(size=s)
fig, ax = plt.subplots(1, 1)
ax.hist(histogram, density=True, alpha=0.6)
x = np.linspace(density.ppf(0.01), density.ppf(0.99), 100)
ax.plot(x, density.pdf(x), LINE_TYPE, lw=1.5)
ax.set_xlabel("CAUCHY")
ax.set_ylabel("DENSITY")
ax.set_title("SIZE: " + str(s))
plt.grid()
plt.show()
def __init__(self, location=None, scale=None):
self.location = location
self.scale = scale
self.bounds = np.array([-np.inf, np.inf])
#self.mean = np.nan
#self.variance = np.nan
self.skewness = np.nan
self.kurtosis = np.nan
if self.scale is not None:
self.x_range_for_pdf = np.linspace(-15*self.scale, 15*self.scale, RECURRENCE_PDF_SAMPLES)
self.parent = cauchy(loc=self.location, scale=self.scale)
self.mean = np.mean(self.getSamples(m=1000))
self.variance = np.var(self.getSamples(m=1000))
def Hist_Cauchy():
cauchy_scale = 1 # Параметры
cauchy_loc = 0
cauchy_label = "Cauchy distribution"
cauchy_color = "grey"
for size in selection_size:
fig, ax = plt.subplots(1, 1)
pdf = cauchy()
random_values = cauchy.rvs(size=size)
ax.hist(random_values,
density=True,
histtype=HIST_TYPE,
alpha=hist_visibility,
color=cauchy_color)
Create_plot(ax, cauchy_label, pdf, size)
def genF(i):
"""
F in (0,1]
"""
lst = []
while len(lst) < i.np:
temp = cauchy(i.u_f, 0.1).rvs()
if temp >= 1:
lst.append(1)
elif temp <= 0:
continue
else:
lst.append(temp)
i.fa = lst[:]
return
def gen_f(self):
"""
F in (0,1]
"""
lst = []
while len(lst) < self.np:
temp = cauchy(self.u_f, 0.1).rvs()
if temp >= 1:
lst.append(1)
elif temp <= 0:
continue
else:
lst.append(temp)
self.fa = lst[:]
return
def genF(i):
"""
F in (0,1]
"""
lst = []
while len(lst) < i.np:
temp = cauchy(i.u_f, 0.1).rvs()
if temp >= 1:
lst.append(1)
elif temp <= 0:
continue
else:
lst.append(temp)
i.fa = lst[:]
return
import numpy as np
import pandas as pd
from scipy.stats import norm
from scipy.stats import cauchy
freqs=np.arange(1800,4000,5)
N=freqs.size
lp=cauchy(0).pdf(np.arange(-1,1,1./10))
nu_max=0
offset=0
#act_offset=np.random.randint(10,high=20)
for i in range(offset+lp.size+5,N-lp.size-5-offset):
#act_offset=np.random.randint(0,high=20)a
act_offset=0
spec=np.zeros(N)
spec[i-lp.size/2:i+lp.size/2]=1*lp
spec[i-lp.size-5:i-5]=.5*lp
pos=np.arange(i-lp.size-5,i-5,1)
pos_off=pos-act_offset
spec[pos_off]=spec[pos]
#spec[pos]=0
#act_offset=np.random.randint(0,high=20)
spec[i+5:i+lp.size+5]=.5*lp
pos=np.arange(i+5,i+lp.size+5,1)
pos_off=pos+act_offset
#spec[pos_off]=spec[pos]
#spec[pos]=0
rand_noise=np.random.random(N)*np.random.randint(1,high=3)
df=pd.DataFrame({'Frequency':freqs,
'l0':spec,
'noise':rand_noise,})
df.to_csv('/home/rakesh/Fake_Data/Test/Spec_numax_%d.csv'%(freqs[i]))
def lorentz(x, C, mu, sigma):
lorentz = C * cauchy(loc=mu, scale=sigma).pdf(x)
return lorentz
xi = np.asarray(xi)
n = xi.size
shape = np.broadcast(sigma, mu).shape
xi = xi.reshape(xi.shape + tuple([1 for s in shape]))
return ((n - 1) * np.log(sigma)
- np.sum(np.log(sigma ** 2 + (xi - mu) ** 2), 0))
#----------------------------------------------------------------------
# Draw the sample from a Cauchy distribution
np.random.seed(44)
mu_0 = 0
gamma_0 = 2
xi = cauchy(mu_0, gamma_0).rvs(10)
#----------------------------------------------------------------------
# Perform MCMC:
# set up our Stochastic variables, mu and gamma
mu = pymc.Uniform('mu', -5, 5)
log_gamma = pymc.Uniform('log_gamma', -10, 10, value=0)
@pymc.deterministic
def gamma(log_gamma=log_gamma):
return np.exp(log_gamma)
# set up our observed variable x
x = pymc.Cauchy('x', mu, gamma, observed=True, value=xi)
residuals = residuals * 180 / np.pi
pi = 180
# x axis for plotting
x = np.linspace(-pi, pi, 1000)
c_loc, c_gamma = cauchy.fit(residuals)
fwhm = 2 * c_gamma
g_mu_bad, g_sigma_bad = norm.fit(residuals)
g_mu, g_sigma = norm.fit(residuals[np.abs(residuals) < 10])
plt.hist(residuals, bins='auto', label='Histogram', normed=True, alpha=.7)
plt.plot(
x,
cauchy(c_loc, c_gamma).pdf(x),
label='Lorentz: FWHM $=${:.3f}'.format(fwhm),
linewidth=2
)
plt.plot(
x,
norm(g_mu_bad, g_sigma_bad).pdf(x),
label='Unrestricted Gauss: $\sigma =$ {:.3f}'.format(g_sigma_bad),
linewidth=2
)
plt.plot(
x,
norm(g_mu, g_sigma).pdf(x),
label='+- 10 deg Gauss: $\sigma =$ {:.3f}'.format(g_sigma),
linewidth=2
)
import numpy as np
from scipy.stats import cauchy
import matplotlib.pyplot as plt
n = 1000
distribution = cauchy()
fig, ax = plt.subplots()
data = distribution.rvs(n)
if 0:
ax.plot(list(range(n)), data, 'bo', alpha=0.5)
ax.vlines(list(range(n)), 0, data, lw=0.2)
ax.set_title("{} observations from the Cauchy distribution".format(n))
if 1:
# == Compute sample mean at each n == #
sample_mean = np.empty(n)
for i in range(n):
sample_mean[i] = np.mean(data[:i])
# == Plot == #
ax.plot(list(range(n)), sample_mean, 'r-', lw=3, alpha=0.6,
label=r'$\bar X_n$')
ax.plot(list(range(n)), [0] * n, 'k--', lw=0.5)
ax.legend()
fig.show()
# you can set usetex to False.
from astroML.plotting import setup_text_plots
setup_text_plots(fontsize=8, usetex=True)
# ------------------------------------------------------------
# Define the distribution parameters to be plotted
gamma_values = [0.5, 1.0, 2.0]
linestyles = ["-", "--", ":"]
mu = 0
x = np.linspace(-10, 10, 1000)
# ------------------------------------------------------------
# plot the distributions
fig, ax = plt.subplots(figsize=(5, 3.75))
for gamma, ls in zip(gamma_values, linestyles):
dist = cauchy(mu, gamma)
plt.plot(x, dist.pdf(x), ls=ls, color="black", label=r"$\mu=%i,\ \gamma=%.1f$" % (mu, gamma))
plt.xlim(-4.5, 4.5)
plt.ylim(0, 0.65)
plt.xlabel("$x$")
plt.ylabel(r"$p(x|\mu,\gamma)$")
plt.title("Cauchy Distribution")
plt.legend()
plt.show()
eta01 = 3 # center of Lorentzian distribution for excitability
eta02 = -5
k01 = -3 # center of Lorentzian distribution for synaptic strength
k02 = 5
deltaeta1 = 1 # degree of heterogeneity for excitability
deltak1 = 1 # degree of heterogeneity for synaptic strength
deltaeta2 = 0.5
deltak2 = 0.5
sharp = 2 # sharpness of the synaptic function
an_values = {2: 2/3, # normalization constants, pre-calculated
3: 2/5,
5: 8/63,
9: 128/12155,
15: 2048/9694845}
an = an_values[sharp] # normalization constant for specific sharpness
dist1 = cauchy(k01, deltak1) # Lorentzian distribution
dist2 = cauchy(k02, deltak2)
k1 = dist1.rvs(size=halfn).tolist() # initializing the k-value for all the neurons
k2 = dist2.rvs(size=halfn).tolist()
dist3 = cauchy(eta01, deltaeta1)
dist4 = cauchy(eta02, deltaeta2)
eta1 = dist3.rvs(size=halfn).tolist()
eta2 = dist4.rvs(size=halfn).tolist()
print('Initial Values Loaded')
foldername = raw_input('Enter Folder Name: ')
os.makedirs(foldername)
def main():
t = ti # t is the time variable
xi = xi.reshape(xi.shape + tuple([1 for s in shape]))
return ((n - 1) * np.log(gamma)
- np.sum(np.log(gamma ** 2 + (xi - mu) ** 2), 0))
#------------------------------------------------------------
# Define the grid and compute logL
gamma = np.linspace(0.1, 5, 70)
mu = np.linspace(-5, 5, 70)
np.random.seed(44)
mu0 = 0
gamma0 = 2
xi = cauchy(mu0, gamma0).rvs(10)
logL = cauchy_logL(xi, gamma[:, np.newaxis], mu)
logL -= logL.max()
#------------------------------------------------------------
# Find the max and print some information
i, j = np.where(logL >= np.max(logL))
print "mu from likelihood:", mu[j]
print "gamma from likelihood:", gamma[i]
print
med, sigG = median_sigmaG(xi)
print "mu from median", med
print "gamma from quartiles:", sigG / 1.483 # Equation 3.54
tout = 0.001 # output interval
#### Model Variables ####
eta0 = -0.5 # center of Lorentzian distribution for excitability
k0 = 0.5 # center of Lorentzian distribution for synaptic strength
deltaeta = 0.5 # degree of heterogeneity for excitability
deltak = 0.1 # degree of heterogeneity for synaptic strength
sharp = 2 # sharpness of the synaptic function
an_values = {2: 2/3, # normalization constants, pre-calculated
3: 2/5,
5: 8/63,
9: 128/12155,
15: 2048/9694845}
an = an_values[sharp] # normalization constant for specific sharpness
dist1 = cauchy(k0, deltak) # Lorentzian distribution
k = dist1.rvs(size=n).tolist() # initializing the k-value for all the neurons
dist2 = cauchy(eta0, deltaeta)
eta = dist2.rvs(size=n).tolist()
print('Initial Values Loaded')
foldername = raw_input('Enter Folder Name: ')
os.makedirs(foldername)
def main():
t = ti # t is the time variable
theta = [None]*n # initializing a list with n entries for each neuron
t_output = [t] # t_output collects data to be plotted
load = 0
loadstep = tout/(tf-ti)
def lorentz(A, mu, sigma, x):
return A * stats.cauchy(loc=mu, scale=sigma).pdf(x)
print "hello world!"
# Define our test distribution: a mix of Cauchy-distributed variables
import numpy as np
from scipy import stats
np.random.seed(0)
x = np.concatenate([stats.cauchy(-5, 1.8).rvs(500),
stats.cauchy(-4, 0.8).rvs(2000),
stats.cauchy(-1, 0.3).rvs(500),
stats.cauchy(2, 0.8).rvs(1000),
stats.cauchy(4, 1.5).rvs(500)])
# truncate values to a reasonable range
x = x[(x > -15) & (x < 15)]
def case2(indexes=CASE_2_ATTRIBUTE_INDEXES,output=True):
accuracy_in_each_turn = list()
precision_in_each_turn_spam = list()
recall_in_each_turn_spam = list()
precision_in_each_turn_ham = list()
recall_in_each_turn_ham = list()
m = np.loadtxt(open("resources/normalized_data.csv","rb"),delimiter=',')
shuffled = np.random.permutation(m)
valid.validate_cross_validation(NUMBER_OF_ROUNDS,TRAIN_TEST_RATIO)
# equiprobable priors
prior_spam = 0.5
prior_ham = 0.5
for i in xrange(NUMBER_OF_ROUNDS):
# we're using cross-validation so each iteration we take a different
# slice of the data to serve as test set
train_set,test_set = prep.split_sets(shuffled,TRAIN_TEST_RATIO,i)
#parameter estimation
#but now we take 10 attributes into consideration
sample_means_word_spam = list()
sample_means_word_ham = list()
sample_variances_word_spam = list()
sample_variances_word_ham = list()
for attr_index in indexes:
sample_means_word_spam.append(nb.take_mean_spam(train_set,attr_index,SPAM_ATTR_INDEX))
sample_means_word_ham.append(nb.take_mean_ham(train_set,attr_index,SPAM_ATTR_INDEX))
sample_variances_word_spam.append(nb.take_variance_spam(train_set,attr_index,SPAM_ATTR_INDEX))
sample_variances_word_ham.append(nb.take_variance_ham(train_set,attr_index,SPAM_ATTR_INDEX))
#sample standard deviations from sample variances
sample_std_devs_spam = map(lambda x: x ** (1/2.0), sample_variances_word_spam)
sample_std_devs_ham = map(lambda x: x ** (1/2.0), sample_variances_word_ham)
hits = 0.0
misses = 0.0
#number of instances correctly evaluated as spam
correctly_is_spam = 0.0
#total number of spam instances
is_spam = 0.0
#total number of instances evaluated as spam
guessed_spam = 0.0
#number of instances correctly evaluated as ham
correctly_is_ham = 0.0
#total number of ham instances
is_ham = 0.0
#total number of instances evaluated as ham
guessed_ham = 0.0
# now we test the hypothesis against the test set
for row in test_set:
# ou seja, o produto de todas as prob. condicionais das palavras dada a classe
# eu sei que ta meio confuso, mas se olhar com cuidado eh bonito fazer isso tudo numa linha soh! =)
product_of_all_conditional_probs_spam = reduce(lambda acc,cur: acc * stats.cauchy(sample_means_word_spam[cur], sample_std_devs_spam[cur]).pdf(row[indexes[cur]]) , xrange(10), 1)
# nao precisa dividir pelo termo de normalizacao pois so queremos saber qual e o maior!
posterior_spam = prior_spam * product_of_all_conditional_probs_spam
product_of_all_conditional_probs_ham = reduce(lambda acc,cur: acc * stats.cauchy(sample_means_word_ham[cur], sample_std_devs_ham[cur]).pdf(row[indexes[cur]]) , xrange(10), 1)
posterior_ham = prior_ham * product_of_all_conditional_probs_ham
# whichever is greater - that will be our prediction
if posterior_spam > posterior_ham:
guess = 1
else:
guess = 0
if(row[SPAM_ATTR_INDEX] == guess):
hits += 1
else:
misses += 1
# we'll use these to calculate metrics
if (row[SPAM_ATTR_INDEX] == 1 ):
is_spam += 1
if guess == 1:
guessed_spam += 1
correctly_is_spam += 1
else:
guessed_ham += 1
else:
is_ham += 1
if guess == 1:
guessed_spam += 1
else:
guessed_ham += 1
correctly_is_ham += 1
#accuracy = number of correctly evaluated instances/
# number of instances
#
#
accuracy = hits/(hits+misses)
#precision_spam = number of correctly evaluated instances as spam/
# number of spam instances
#
#
# in order to avoid divisions by zero in case nothing was found
if(is_spam == 0):
precision_spam = 0
else:
precision_spam = correctly_is_spam/is_spam
#recall_spam = number of correctly evaluated instances as spam/
# number of evaluated instances como spam
#
#
# in order to avoid divisions by zero in case nothing was found
if(guessed_spam == 0):
recall_spam = 0
else:
recall_spam = correctly_is_spam/guessed_spam
#precision_ham = number of correctly evaluated instances as ham/
# number of ham instances
#
#
# in order to avoid divisions by zero in case nothing was found
if(is_ham == 0):
precision_ham = 0
else:
precision_ham = correctly_is_ham/is_ham
#recall_ham = number of correctly evaluated instances as ham/
# number of evaluated instances como ham
#
#
# in order to avoid divisions by zero in case nothing was found
if(guessed_ham == 0):
recall_ham = 0
else:
recall_ham = correctly_is_ham/guessed_ham
accuracy_in_each_turn.append(accuracy)
precision_in_each_turn_spam.append(precision_spam)
recall_in_each_turn_spam.append(recall_spam)
precision_in_each_turn_ham.append(precision_ham)
recall_in_each_turn_ham.append(recall_ham)
# calculation of means for each metric at the end
mean_accuracy = np.mean(accuracy_in_each_turn)
std_dev_accuracy = np.std(accuracy_in_each_turn)
variance_accuracy = np.var(accuracy_in_each_turn)
mean_precision_spam = np.mean(precision_in_each_turn_spam)
std_dev_precision_spam = np.std(precision_in_each_turn_spam)
variance_precision_spam = np.var(precision_in_each_turn_spam)
mean_recall_spam = np.mean(recall_in_each_turn_spam)
std_dev_recall_spam = np.std(recall_in_each_turn_spam)
variance_recall_spam = np.var(recall_in_each_turn_spam)
mean_precision_ham = np.mean(precision_in_each_turn_ham)
std_dev_precision_ham = np.std(precision_in_each_turn_ham)
variance_precision_ham = np.var(precision_in_each_turn_ham)
mean_recall_ham = np.mean(recall_in_each_turn_ham)
std_dev_recall_ham = np.std(recall_in_each_turn_ham)
variance_recall_ham = np.var(recall_in_each_turn_ham)
if output:
print "\033[1;32m"
print '============================================='
print 'CASE 2 - TEN ATTRIBUTES - USING CAUCHY MODEL'
print '============================================='
print "\033[00m"
print 'MEAN ACCURACY: '+str(round(mean_accuracy,5))
print 'STD. DEV. OF ACCURACY: '+str(round(std_dev_accuracy,5))
print 'VARIANCE OF ACCURACY: '+str(round(variance_accuracy,8))
print ''
print 'MEAN PRECISION FOR SPAM: '+str(round(mean_precision_spam,5))
print 'STD. DEV. OF PRECISION FOR SPAM: '+str(round(std_dev_precision_spam,5))
print 'VARIANCE OF PRECISION FOR SPAM: '+str(round(variance_precision_spam,8))
print ''
print 'MEAN RECALL FOR SPAM: '+str(round(mean_recall_spam,5))
print 'STD. DEV. OF RECALL FOR SPAM: '+str(round(std_dev_recall_spam,5))
print 'VARIANCE OF RECALL FOR SPAM: '+str(round(variance_recall_spam,8))
print ''
print 'MEAN PRECISION FOR HAM: '+str(round(mean_precision_ham,5))
print 'STD. DEV. OF PRECISION FOR HAM: '+str(round(std_dev_precision_ham,5))
print 'VARIANCE OF PRECISION FOR HAM: '+str(round(variance_precision_ham,8))
print ''
print 'MEAN RECALL FOR HAM: '+str(round(mean_recall_ham,5))
print 'STD. DEV. OF RECALL FOR HAM: '+str(round(std_dev_recall_ham,5))
print 'VARIANCE OF RECALL FOR HAM: '+str(round(variance_recall_ham,8))
def fake_spec(nu_min,nu_max,df,delt_nu,numax,modes):
from scipy.stats import norm
from scipy.stats import cauchy
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
max_freq=nu_max
min_freq=nu_min
span=nu_max-nu_min
N=int(span/df)+1
Freq_axis=np.arange(min_freq,max_freq+1,df)
freq_bins=np.arange(0,120,1)#Freq bins from 20 to 100 \muHz in steps of 1
lmodes=2
D0=1.5
pos1=np.zeros(lmodes+1)
epsilon=0
spec=np.zeros(N)##l=0 spectra
spec2=np.zeros(N)##l=2
spec1=np.zeros(N)##l=1
gmean=((((numax)-(np.mean(Freq_axis)))/df)/Freq_axis.size)
gp=norm(gmean,0.25*2).pdf(np.arange(-1,1,2./N))#Gaussian profile for envelope
lp=cauchy(3.0).pdf(np.arange(-2,2,2./60))#lorentzian profile for monopole
lp2=cauchy(3.0).pdf(np.arange(-2,2,2./60))#lorentzian profile for dipole and quadrapole moments
modes.size
for i in range(1,modes+1):
if(i==1):
spec[spec.size/2]=1.0
spec2[spec.size/(2)+100]=0.5
spec1[spec.size/(2)-100]=0.5
if(i>=1):
spec[spec.size/(2**i)+epsilon]=1
spec2[spec.size/(2**i)+4*lp.size-epsilon]=0.5
spec2[spec.size/(2**i)+pos1[2]]=0.5
spec1[spec.size/(2**i)-4*lp.size+epsilon]=0.5
#spec1[spec.size/(2**i)-pos1[1]]=0.5
spec[spec.size-spec.size/(2**i)]=1
spec2[spec.size-(spec.size/(2**i))+epsilon]=0.5
#spec2[spec.size-(spec.size/(2**i)-pos1[2])]=0.5
spec1[spec.size-(spec.size/(2**i)+4*lp.size)-epsilon]=0.5
spec2[spec.size-(spec.size/(2**i)+pos1[1])]=0.5
"""
Now add the lorentzian profile
"""
for i in range(N):
if(spec[i]==1.):
"""
Check for all values equal to monopole
TODO:Find non-zero value
"""
spec[i]=0;
#spec[i-lp.size/2:i+lp.size/2]+=lp*np.random.randint(1,high=10)#random amplitude variations
spec[i-lp.size/2:i+lp.size/2]+=lp
for i in range(N):
if(spec2[i]==0.5):
"""
Check for dipole/quadrapole
"""
spec2[i]=0;
#spec2[i-lp2.size/2:i+lp2.size/2]+=lp2*np.random.randint(1,high=10)#random amplitude variations
spec2[i-lp2.size/2:i+lp2.size/2]+=lp2
for i in range(N):
if(spec1[i]==0.5):
spec1[i]=0;
#spec1[i-lp2.size/2:i+lp2.size/2]+=lp2*np.random.randint(1,high=10)#random amplitude variations
spec1[i-lp2.size/2:i+lp2.size/2]+=lp2
"""
random noise generated with normal distribution
"""
rand_noise=np.random.random(N)*np.random.randint(1,high=3)
print np.size(rand_noise)
spec_comb=spec+spec1+spec2
dat_frame=pd.DataFrame({'Frequency':Freq_axis[0:N],
'l0':spec,
'l1':spec1,
'l2':spec2,
'noise':rand_noise,})
dat_frame.to_csv('/home/rakesh/Fake_Data/Spec_numax_%d_modes_%d.csv'%(numax, modes))
def modelo2(x, params):
A, mu, sigma, a, b = params
return -A * cauchy(loc=mu, scale=sigma).pdf(x) + a * x + b
# -*- coding: UTF-8 -*-
# Ejemplo de distrbuciones del módulo stats de Scipy
import numpy as np
import matplotlib.pyplot as plt
from scipy.stats import cauchy, gamma, maxwell, norm
SAMPLE_SIZE = 100
x = np.linspace(-5,5,1000)
# Inicializo las distribuciones
cauchy_dist = cauchy()
gamma_dist = gamma(1, scale=2.)
maxwell_dist = maxwell()
norm_dist = norm()
# Calculo la funcion de densidad de probabilidad de cada distribucion
cauchy_pdf = cauchy_dist.pdf(x)
gamma_pdf = gamma_dist.pdf(x)
maxwell_pdf = maxwell_dist.pdf(x)
norm_pdf = norm_dist.pdf(x)
fig = plt.figure("Distribuciones")
sp1 = fig.add_subplot(221, title='Distribucion de Cauchy')
sp2 = fig.add_subplot(222, title='Distribucion Gamma')
sp3 = fig.add_subplot(223, title='Distribucion de Maxwell')
from __future__ import division
import numpy as np
from scipy.stats import t, beta, lognorm, expon, gamma, poisson, cauchy
import matplotlib.pyplot as plt
n = 100
dists = {"student's t with 10 dof": t(10),
"beta(2,2)": beta(2,2),
"lognormal LN(0,1/2)" : lognorm(0.5),
"gamma(5,1/2)" : gamma(5, scale=2),
"poisson(4)" : poisson(4),
"exp(1)" : expon(1),
"cauchy" : cauchy()}
D = 3
fig, ax = plt.subplots(D,1, figsize=(10,10))
plt.subplots_adjust(hspace=0.5)
for d in range(D):
name = np.random.choice(dists.keys())
X = dists[name].rvs(n)
Xbar = np.cumsum(X) / range(1,n+1)
ax[d].plot(range(1,n+1), X, 'bo', alpha=0.5, markersize=4)
ax[d].vlines(range(1,n+1), dists[name].mean(), X, 'b', alpha=0.5)
ax[d].plot(range(1,n+1), Xbar, 'g', lw=2,
label=r'$\bar X_n$ for $X_i \sim $ ' + name)
ax[d].plot(range(1,n+1), np.ones(n)*dists[name].mean() , 'k--',
label=r'$\mu$', lw=2)
ax[d].legend(loc = 3, ncol =2, mode='expand',
bbox_to_anchor = (.05, 1.02, .9, .102))
post_mean_l = laplace_mean[3]/laplace_ml[3]
# Use results to plot a Gaussian PDF here.
# Print using string formatting:
print 'Beta case:'
print 'Marg. like.: {:10.4e} (quad), {:10.4e} (Laplace)'.format(bi.mlike, laplace_ml[3])
print 'Posterior mean: {:4.2f} (quad), {:4.2f} (Laplace)'.format(bi.post_mean, post_mean_l)
print
#-------------------------------------------------------------------------------
# 3rd case: Cauchy, const prior
x0, d = 5., 3.
data = stats.cauchy(x0, d).rvs(5)
flat_pdf = .001 # e.g., for prior range 1e3
cli = CauchyLocationInference(d, data, flat_pdf, (-15., 25.))
cfig = figure()
cli.plot(alpha=.5)
xlim(-10, 15.)
xlabel('$x_0$')
ylabel('Posterior PDF')
title('Cauchy case; CDF method')
samps = []
for i in range(10000):
samps.append(cli.samp_cdf())
samps = array(samps)
from scipy import stats
from astroML.density_estimation import KDE, KNeighborsDensity
from astroML.plotting import hist
#------------------------------------------------------------
# Generate our data: a mix of several Cauchy distributions
# this is the same data used in the Bayesian Blocks figure
np.random.seed(0)
N = 10000
mu_gamma_f = [(5, 1.0, 0.1),
(7, 0.5, 0.5),
(9, 0.1, 0.1),
(12, 0.5, 0.2),
(14, 1.0, 0.1)]
true_pdf = lambda x: sum([f * stats.cauchy(mu, gamma).pdf(x)
for (mu, gamma, f) in mu_gamma_f])
x = np.concatenate([stats.cauchy(mu, gamma).rvs(int(f * N))
for (mu, gamma, f) in mu_gamma_f])
np.random.shuffle(x)
x = x[x > -10]
x = x[x < 30]
#------------------------------------------------------------
# plot the results
fig = plt.figure(figsize=(8, 8))
fig.subplots_adjust()
N_values = (500, 5000)
subplots = (211, 212)
k_values = (10, 100)
if I_gauss == 0:
O_CG = np.inf
err_O_CG = np.inf
else:
O_CG = I_cauchy / I_gauss
err_O_CG = O_CG * np.sqrt((err_gauss / I_gauss) ** 2)
return (I_gauss, err_gauss), (I_cauchy, err_cauchy), (O_CG, err_O_CG)
#------------------------------------------------------------
# Draw points from a Cauchy distribution
np.random.seed(44)
mu = 0
gamma = 2
xi = cauchy(mu, gamma).rvs(100)
#------------------------------------------------------------
# compute the odds ratio for the first 10 points
((I_gauss, err_gauss),
(I_cauchy, err_cauchy),
(O_CG, err_O_CG)) = calculate_odds_ratio(xi[:10])
print("Results for first 10 points:")
print(" L(M = Cauchy) = %.2e +/- %.2e" % (I_cauchy, err_cauchy))
print(" L(M = Gauss) = %.2e +/- %.2e" % (I_gauss, err_gauss))
print(" O_{CG} = %.3g +/- %.3g" % (O_CG, err_O_CG))
#------------------------------------------------------------
# calculate the results as a function of number of points
Nrange = np.arange(10, 101, 2)
y2 = rv2.cdf(x)
y3 = rv3.cdf(x)
# plot the pdf
plt.clf()
plt.plot(x, y1, lw=3, label='scale=5')
plt.plot(x, y2, lw=3, label='scale=3')
plt.plot(x, y3, lw=3, label='scale=7')
plt.xlabel('X', fontsize=20)
plt.ylabel('PDF', fontsize=15)
plt.legend()
plt.savefig('/home/tomer/articles/python/tex/images/norm_cdf.png')
# generate instance cauchy, chi, exponential, uniform
rv1 = st.cauchy(loc=0, scale=5)
rv2 = st.chi(2, loc=0, scale=8)
rv3 = st.expon(loc=0, scale=7)
rv4 = st.uniform(loc=0, scale=20)
# estimate pdf at some points
y1 = rv1.pdf(x)
y2 = rv2.pdf(x)
y3 = rv3.pdf(x)
y4 = rv4.pdf(x)
# plot the pdf
plt.clf()
plt.plot(x, y1, lw=3, label='Cauchy')
plt.plot(x, y2, lw=3, label='Chi')
plt.plot(x, y3, lw=3, label='Exponential')
