def _softMax(self,Y):
""" softmax function used on outputs"""
y = []
sumExpY = 0.0
for i in Y:
sumExpY = sumExpY + _exp(i)
for i in Y:
t = _exp(i)/sumExpY
y.append(t)
return y
def gammavariate(self, alpha, beta):
"""Gamma distribution. Not the gamma function!
Conditions on the parameters are alpha > 0 and beta > 0.
The probability distribution function is:
x ** (alpha - 1) * math.exp(-x / beta)
pdf(x) = --------------------------------------
math.gamma(alpha) * beta ** alpha
"""
if alpha <= 0.0 or beta <= 0.0:
raise ValueError, "gammavariate: alpha and beta must be > 0.0"
random = self.random
if alpha > 1.0:
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
if not 1e-07 < u1 < 0.9999999:
continue
u2 = 1.0 - random()
v = _log(u1 / (1.0 - u1)) / ainv
x = alpha * _exp(v)
z = u1 * u1 * u2
r = bbb + ccc * v - x
if r + SG_MAGICCONST - 4.5 * z >= 0.0 or r >= _log(z):
return x * beta
else:
if alpha == 1.0:
u = random()
while u <= 1e-07:
u = random()
return -_log(u) * beta
while 1:
u = random()
b = (_e + alpha) / _e
p = b * u
if p <= 1.0:
x = p ** (1.0 / alpha)
else:
x = -_log((b - p) / alpha)
u1 = random()
if p > 1.0:
if u1 <= x ** (alpha - 1.0):
break
elif u1 <= _exp(-x):
break
return x * beta
def stdgamma(self, alpha, ainv, bbb, ccc):
# ainv = sqrt(2 * alpha - 1)
# bbb = alpha - log(4)
# ccc = alpha + ainv
random = self.random
if alpha <= 0.0:
raise ValueError, 'stdgamma: alpha must be > 0.0'
if alpha > 1.0:
# Uses R.C.H. Cheng, "The generation of Gamma
# variables with non-integral shape parameters",
# Applied Statistics, (1977), 26, No. 1, p71-74
while 1:
u1 = random()
u2 = random()
v = _log(u1/(1.0-u1))/ainv
x = alpha*_exp(v)
z = u1*u1*u2
r = bbb+ccc*v-x
if r + SG_MAGICCONST - 4.5*z >= 0.0 or r >= _log(z):
return x
elif alpha == 1.0:
# expovariate(1)
u = random()
while u <= 1e-7:
u = random()
return -_log(u)
else: # alpha is between 0 and 1 (exclusive)
# Uses ALGORITHM GS of Statistical Computing - Kennedy & Gentle
while 1:
u = random()
b = (_e + alpha)/_e
p = b*u
if p <= 1.0:
x = pow(p, 1.0/alpha)
else:
# p > 1
x = -_log((b-p)/alpha)
u1 = random()
if not (((p <= 1.0) and (u1 > _exp(-x))) or
((p > 1) and (u1 > pow(x, alpha - 1.0)))):
break
return x
def _calculate_weights(self, this_samples, N):
"""Calculate and save the weights of a run."""
this_weights = self.weights.append(N)[:,0]
if self.target_values is None:
for i in range(N):
tmp = self.target(this_samples[i]) - self.proposal.evaluate(this_samples[i])
this_weights[i] = _exp(tmp)
else:
this_target_values = self.target_values.append(N)
for i in range(N):
this_target_values[i] = self.target(this_samples[i])
tmp = this_target_values[i] - self.proposal.evaluate(this_samples[i])
this_weights[i] = _exp(tmp)
def vonmisesvariate(self, mu, kappa):
"""Circular data distribution.
mu is the mean angle, expressed in radians between 0 and 2*pi, and
kappa is the concentration parameter, which must be greater than or
equal to zero. If kappa is equal to zero, this distribution reduces
to a uniform random angle over the range 0 to 2*pi.
"""
random = self.random
if kappa <= 1e-06:
return TWOPI * random()
s = 0.5 / kappa
r = s + _sqrt(1.0 + s * s)
while 1:
u1 = random()
z = _cos(_pi * u1)
d = z / (r + z)
u2 = random()
if u2 < 1.0 - d * d or u2 <= (1.0 - d) * _exp(d):
break
q = 1.0 / r
f = (q + z) / (1.0 + q * z)
u3 = random()
if u3 > 0.5:
theta = (mu + _acos(f)) % TWOPI
else:
theta = (mu - _acos(f)) % TWOPI
return theta
def vonmisesvariate(self, mu, kappa):
"""Circular data distribution.
mu is the mean angle, expressed in radians between 0 and 2*pi, and
kappa is the concentration parameter, which must be greater than or
equal to zero. If kappa is equal to zero, this distribution reduces
to a uniform random angle over the range 0 to 2*pi.
"""
random = self.random
if kappa <= 1e-06:
return TWOPI * random()
a = 1.0 + _sqrt(1.0 + 4.0 * kappa * kappa)
b = (a - _sqrt(2.0 * a)) / (2.0 * kappa)
r = (1.0 + b * b) / (2.0 * b)
while 1:
u1 = random()
z = _cos(_pi * u1)
f = (1.0 + r * z) / (r + z)
c = kappa * (r - f)
u2 = random()
if u2 < c * (2.0 - c) or u2 <= c * _exp(1.0 - c):
break
u3 = random()
if u3 > 0.5:
theta = mu % TWOPI + _acos(f)
else:
theta = mu % TWOPI - _acos(f)
return theta
def lognormvariate(self, mu, sigma):
# """Log normal distribution.
# If you take the natural logarithm of this distribution, you'll get a
# normal distribution with mean mu and standard deviation sigma.
# mu can have any value, and sigma must be greater than zero.
# """
return _exp(self.normalvariate(mu, sigma))
def _myExp(x): if x < 0.00000001: return 0 elif x > 500: return 1e200 else: return _exp(x)
def _sigmoid(x): if x < -50: return 0. elif x > 20: return 1. else: return 1./(1.+_exp(-1*x))
def vonmisesvariate(self, mu, kappa):
random = self.random
if kappa <= 9.9999999999999995e-007:
return TWOPI * random()
a = 1.0 + _sqrt(1.0 + 4.0 * kappa * kappa)
b = (a - _sqrt(2.0 * a)) / 2.0 * kappa
r = (1.0 + b * b) / 2.0 * b
while 1:
u1 = random()
z = _cos(_pi * u1)
f = (1.0 + r * z) / (r + z)
c = kappa * (r - f)
u2 = random()
if u2 >= c * (2.0 - c):
pass
if not (u2 > c * _exp(1.0 - c)):
break
u3 = random()
if u3 > 0.5:
theta = mu % TWOPI + _acos(f)
else:
theta = mu % TWOPI - _acos(f)
return theta
def gammavariate(self, alpha, beta):
if alpha <= 0.0 or beta <= 0.0:
raise ValueError('gammavariate: alpha and beta must be > 0.0')
random = self.random
if alpha > 1.0:
ainv = _sqrt(2.0*alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
u1 = random()
if not 1e-07 < u1 < 0.9999999:
continue
u2 = 1.0 - random()
v = _log(u1/(1.0 - u1))/ainv
x = alpha*_exp(v)
z = u1*u1*u2
r = bbb + ccc*v - x
#ERROR: Unexpected statement: 517 BINARY_MULTIPLY | 518 RETURN_VALUE
if r + SG_MAGICCONST - 4.5*z >= 0.0 or r >= _log(z):
return x*beta
continue
else:
if alpha == 1.0:
u = random()
while u <= 1e-07:
u = random()
return -_log(u)*beta
while True:
u = random()
b = (_e + alpha)/_e
p = b*u
if p <= 1.0:
x = p**(1.0/alpha)
else:
x = -_log((b - p)/alpha)
u1 = random()
if p > 1.0:
if u1 <= x**(alpha - 1.0):
break
continue
if u1 <= _exp(-x):
break
elif u1 <= _exp(-x):
break
return x*beta
def gammavariate(self, alpha, beta):
if alpha <= 0.0 or beta <= 0.0:
raise ValueError, 'gammavariate: alpha and beta must be > 0.0'
random = self.random
if alpha > 1.0:
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
if not 1e-07 < u1 < 0.9999999:
continue
u2 = 1.0 - random()
v = _log(u1 / (1.0 - u1)) / ainv
x = alpha * _exp(v)
z = u1 * u1 * u2
r = bbb + ccc * v - x
if r + SG_MAGICCONST - 4.5 * z >= 0.0 or r >= _log(z):
return x * beta
else:
if alpha == 1.0:
u = random()
while u <= 1e-07:
u = random()
return -_log(u) * beta
while 1:
u = random()
b = (_e + alpha) / _e
p = b * u
if p <= 1.0:
x = p ** (1.0 / alpha)
else:
x = -_log((b - p) / alpha)
u1 = random()
if p > 1.0:
if u1 <= x ** (alpha - 1.0):
break
elif u1 <= _exp(-x):
break
return x * beta
def exp(S):
"""Convenience function for exponentiating PowerSeries.
This can also replace the ``math.exp`` function, extending it to
take a PowerSeries as an argument.
"""
from math import exp as _exp
if isinstance(S, PowerSeries):
return S.exponential()
return _exp(S)
def gammavariate(self, alpha, beta):
if alpha <= 0.0 or beta <= 0.0:
raise ValueError, 'gammavariate: alpha and beta must be > 0.0'
random = self.random
if alpha > 1.0:
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
u2 = random()
v = _log(u1 / (1.0 - u1)) / ainv
x = alpha * _exp(v)
z = u1 * u1 * u2
r = bbb + ccc * v - x
if r + SG_MAGICCONST - 4.5 * z >= 0.0 or r >= _log(z):
return x * beta
elif alpha == 1.0:
u = random()
while u <= 9.9999999999999995e-008:
u = random()
return -_log(u) * beta
else:
while 1:
u = random()
b = (_e + alpha) / _e
p = b * u
if p <= 1.0:
x = pow(p, 1.0 / alpha)
else:
x = -_log((b - p) / alpha)
u1 = random()
if p <= 1.0 and u1 > _exp(-x) and p > 1:
pass
if not (u1 > pow(x, alpha - 1.0)):
break
return x * beta
def _sigmoid(x):
"""Sigmoid function
>>> _sigmoid(0)
0.5
>>> _sigmoid(1)
0.7310585786300049
>>> _sigmoid(-1)
0.2689414213699951
"""
e=0
try:
e = _exp(-1*x)
except OverflowError:
return 0
return 1./(1.+e)
def vonmisesvariate(self, mu, kappa):
"""Circular data distribution.
mu is the mean angle, expressed in radians between 0 and 2*pi, and
kappa is the concentration parameter, which must be greater than or
equal to zero. If kappa is equal to zero, this distribution reduces
to a uniform random angle over the range 0 to 2*pi.
"""
# mu: mean angle (in radians between 0 and 2*pi)
# kappa: concentration parameter kappa (>= 0)
# if kappa = 0 generate uniform random angle
# Based upon an algorithm published in: Fisher, N.I.,
# "Statistical Analysis of Circular Data", Cambridge
# University Press, 1993.
# Thanks to Magnus Kessler for a correction to the
# implementation of step 4.
random = self.random
if kappa <= 1e-6:
return TWOPI * random()
a = 1.0 + _sqrt(1.0 + 4.0 * kappa * kappa)
b = (a - _sqrt(2.0 * a)) / (2.0 * kappa)
r = (1.0 + b * b) / (2.0 * b)
while 1:
u1 = random()
z = _cos(_pi * u1)
f = (1.0 + r * z) / (r + z)
c = kappa * (r - f)
u2 = random()
if not (u2 >= c * (2.0 - c) and u2 > c * _exp(1.0 - c)):
break
u3 = random()
if u3 > 0.5:
theta = (mu % TWOPI) + _acos(f)
else:
theta = (mu % TWOPI) - _acos(f)
return theta
def vonmisesvariate(self, mu, kappa):
"""Circular data distribution.
mu is the mean angle, expressed in radians between 0 and 2*pi, and
kappa is the concentration parameter, which must be greater than or
equal to zero. If kappa is equal to zero, this distribution reduces
to a uniform random angle over the range 0 to 2*pi.
"""
# mu: mean angle (in radians between 0 and 2*pi)
# kappa: concentration parameter kappa (>= 0)
# if kappa = 0 generate uniform random angle
# Based upon an algorithm published in: Fisher, N.I.,
# "Statistical Analysis of Circular Data", Cambridge
# University Press, 1993.
# Thanks to Magnus Kessler for a correction to the
# implementation of step 4.
random = self.random
if kappa <= 1e-6:
return TWOPI * random()
s = 0.5 / kappa
r = s + _sqrt(1.0 + s * s)
while 1:
u1 = random()
z = _cos(_pi * u1)
d = z / (r + z)
u2 = random()
if u2 < 1.0 - d * d or u2 <= (1.0 - d) * _exp(d):
break
q = 1.0 / r
f = (q + z) / (1.0 + q * z)
u3 = random()
if u3 > 0.5:
theta = (mu + _acos(f)) % TWOPI
else:
theta = (mu - _acos(f)) % TWOPI
return theta
def _propagateInputClassification(self,input):
"""Same as _propagateInput; but applies softMax
"""
Y,Z = self._propagateInputRegression(input)
#apply softmax function
try:
expY = [_exp(y) for y in Y]
#if the exp of the outputs starts getting too big just normalize the outputs
except OverflowError:
expY = Y
sumExpY = sum(expY)
Y = [y/sumExpY for y in Y]
return Y,Z
def integer_nthroot(y, n):
"""
Return a tuple containing x = floor(y**(1/n))
and a boolean indicating whether the result is exact (that is,
whether x**n == y).
>>> integer_nthroot(16,2)
(4, True)
>>> integer_nthroot(26,2)
(5, False)
"""
if y < 0:
raise ValueError("y must not be negative")
if n < 1:
raise ValueError("n must be positive")
if y in (0, 1):
return y, True
if n == 1:
return y, True
if n > y:
return 1, False
# Get initial estimate for Newton's method. Care must be taken to
# avoid overflow
try:
guess = int(y ** (1.0 / n) + 0.5)
except OverflowError:
try:
guess = int(_exp(_log(y) / n) + 0.5)
except OverflowError:
guess = 1 << int(_log(y, 2) / n)
# Newton iteration
xprev, x = -1, guess
while abs(x - xprev) > 1:
t = x ** (n - 1)
xprev, x = x, x - (t * x - y) // (n * t)
# Compensate
t = x ** n
while t > y:
x -= 1
t = x ** n
return x, t == y
def vonmisesvariate(self, mu, kappa):
random = self.random
if kappa <= 1e-06:
return TWOPI*random()
s = 0.5/kappa
r = s + _sqrt(1.0 + s*s)
while True:
u1 = random()
z = _cos(_pi*u1)
d = z/(r + z)
u2 = random()
if u2 < 1.0 - d*d or u2 <= (1.0 - d)*_exp(d):
break
q = 1.0/r
f = (q + z)/(1.0 + q*z)
u3 = random()
if u3 > 0.5:
theta = (mu + _acos(f)) % TWOPI
else:
theta = (mu - _acos(f)) % TWOPI
return theta
def vonmisesvariate(self, mu, kappa):
random = self.random
if kappa <= 1e-06:
return TWOPI * random()
a = 1.0 + _sqrt(1.0 + 4.0 * kappa * kappa)
b = (a - _sqrt(2.0 * a)) / (2.0 * kappa)
r = (1.0 + b * b) / (2.0 * b)
while 1:
u1 = random()
z = _cos(_pi * u1)
f = (1.0 + r * z) / (r + z)
c = kappa * (r - f)
u2 = random()
if u2 < c * (2.0 - c) or u2 <= c * _exp(1.0 - c):
break
u3 = random()
if u3 > 0.5:
theta = mu % TWOPI + _acos(f)
else:
theta = mu % TWOPI - _acos(f)
return theta
"""Random variable generators.
def gammavariate(self, alpha, beta):
"""Gamma distribution. Not the gamma function!
Conditions on the parameters are alpha > 0 and beta > 0.
The probability distribution function is:
x ** (alpha - 1) * math.exp(-x / beta)
pdf(x) = --------------------------------------
math.gamma(alpha) * beta ** alpha
"""
# alpha > 0, beta > 0, mean is alpha*beta, variance is alpha*beta**2
# Warning: a few older sources define the gamma distribution in terms
# of alpha > -1.0
if alpha <= 0.0 or beta <= 0.0:
raise ValueError('gammavariate: alpha and beta must be > 0.0')
random = self.random
if alpha > 1.0:
# Uses R.C.H. Cheng, "The generation of Gamma
# variables with non-integral shape parameters",
# Applied Statistics, (1977), 26, No. 1, p71-74
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
if not 1e-7 < u1 < 0.9999999:
continue
u2 = 1.0 - random()
v = _log(u1 / (1.0 - u1)) / ainv
x = alpha * _exp(v)
z = u1 * u1 * u2
r = bbb + ccc * v - x
if r + SG_MAGICCONST - 4.5 * z >= 0.0 or r >= _log(z):
return x * beta
elif alpha == 1.0:
# expovariate(1)
u = random()
while u <= 1e-7:
u = random()
return -_log(u) * beta
else: # alpha is between 0 and 1 (exclusive)
# Uses ALGORITHM GS of Statistical Computing - Kennedy & Gentle
while 1:
u = random()
b = (_e + alpha) / _e
p = b * u
if p <= 1.0:
x = p**(1.0 / alpha)
else:
x = -_log((b - p) / alpha)
u1 = random()
if p > 1.0:
if u1 <= x**(alpha - 1.0):
break
elif u1 <= _exp(-x):
break
return x * beta
def vonmisesvariate(self, mu, kappa):
"""Circular data distribution.
mu is the mean angle, expressed in radians between 0 and 2*pi, and
kappa is the concentration parameter, which must be greater than or
equal to zero. If kappa is equal to zero, this distribution reduces
to a uniform random angle over the range 0 to 2*pi.
"""
# mu: mean angle (in radians between 0 and 2*pi)
# kappa: concentration parameter kappa (>= 0)
# if kappa = 0 generate uniform random angle
# Based upon an algorithm published in: Fisher, N.I.,
# "Statistical Analysis of Circular Data", Cambridge
# University Press, 1993.
# Thanks to Magnus Kessler for a correction to the
# implementation of step 4.
random = self.random
if kappa <= 1e-6:
return TWOPI * random()
s = 0.5 / kappa
r = s + _sqrt(1.0 + s * s)
while 1:
u1 = random()
z = _cos(_pi * u1)
d = z / (r + z)
u2 = random()
if u2 < 1.0 - d * d or u2 <= (1.0 - d) * _exp(d):
break
q = 1.0 / r
f = (q + z) / (1.0 + q * z)
u3 = random()
if u3 > 0.5:
theta = (mu + _acos(f)) % TWOPI
else:
theta = (mu - _acos(f)) % TWOPI
return theta
def _f_Gauss(self, k_y, W_y):
"""Gaussian spectrum amplitude."""
return _exp(-(k_y * W_y / 2)**2)
def sigmoidProb(y):
return _random.random() < 1 / (1 + _exp(-y * invMaxY))
def profile(self, r):
"""..."""
if self.x == 0 and self._m == 0:
return self._norm * _exp(-((r.y**2 + r.z**2) / self._W_y**2))
else:
return super().profile(r)
def _f_Gauss_cartesian(self, k_y, k_z, W_y):
"""2d-Gaussian spectrum amplitude.
Impementation for Cartesian coordinates.
"""
return _exp(-W_y**2 * (k_y**2 + k_z**2)/4)
'shuffle', 'normalvariate', 'lognormvariate', 'cunifvariate',
'expovariate', 'vonmisesvariate', 'gammavariate', 'stdgamma', 'gauss',
'betavariate', 'paretovariate', 'weibullvariate', 'getstate', 'setstate',
'jumpahead', 'whseed'
]
def _verify(name, computed, expected):
# for some reason, this failed on some machines, breaking some ages. Original precision: 9.9999999999999995e-008
if (abs((computed - expected)) > 1e-4):
raise ValueError((
'computed value for %s deviates too much (computed %g, expected %g)'
% (name, computed, expected)))
NV_MAGICCONST = ((4 * _exp(-0.5)) / _sqrt(2.0))
_verify('NV_MAGICCONST', NV_MAGICCONST, 1.71552776992141)
TWOPI = (2.0 * _pi)
_verify('TWOPI', TWOPI, 6.2831853071800001)
LOG4 = _log(4.0)
_verify('LOG4', LOG4, 1.3862943611198899)
SG_MAGICCONST = (1.0 + _log(4.5))
_verify('SG_MAGICCONST', SG_MAGICCONST, 2.5040773967762702)
del _verify
class Random:
VERSION = 1
def __init__(self, x=None):
def exp(x):
return _exp(x)
def benchmark():
"""
Run some benchmarks for clambdify and frange.
NumPy and Psyco are used as reference if available.
"""
from time import time
from timeit import Timer
def fbenchmark(f, var=[Symbol('x')]):
"""
Do some benchmarks with f using clambdify, lambdify and psyco.
"""
global cf, pf, psyf
start = time()
cf = clambdify(var, f)
print('compile time (including sympy overhead): %f s' % (
time() - start))
pf = lambdify(var, f, 'math')
psyf = None
psyco = import_module('psyco')
if psyco:
psyf = lambdify(var, f, 'math')
psyco.bind(psyf)
code = '''for x in (i/1000. for i in range(1000)):
f(%s)''' % ('x,'*len(var)).rstrip(',')
t1 = Timer(code, 'from __main__ import cf as f')
t2 = Timer(code, 'from __main__ import pf as f')
if psyf:
t3 = Timer(code, 'from __main__ import psyf as f')
else:
t3 = None
print('for x = (0, 1, 2, ..., 999)/1000')
print('20 times in 3 runs')
print('compiled: %.4f %.4f %.4f' % tuple(t1.repeat(3, 20)))
print('Python lambda: %.4f %.4f %.4f' % tuple(t2.repeat(3, 20)))
if t3:
print('Psyco lambda: %.4f %.4f %.4f' % tuple(t3.repeat(3, 20)))
print('big function:')
from sympy import _exp, _sin, _cos, pi
x = Symbol('x')
## f1 = diff(_exp(x)**2 - _sin(x)**pi, x) \
## * x**12-2*x**3+2*_exp(x**2)-3*x**7+4*_exp(123+x-x**5+2*x**4) \
## * ((x + pi)**5).expand()
f1 = 2*_exp(x**2) + x**12*(-pi*_sin(x)**((-1) + pi)*_cos(x) + 2*_exp(2*x)) \
+ 4*(10*pi**3*x**2 + 10*pi**2*x**3 + 5*pi*x**4 + 5*x*pi**4 + pi**5
+ x**5)*_exp(123 + x + 2*x**4 - x**5) - 2*x**3 - 3*x**7
fbenchmark(f1)
print()
print('simple function:')
y = Symbol('y')
f2 = sqrt(x*y) + x*5
fbenchmark(f2, [x, y])
times = 100000
fstr = '_exp(_sin(_exp(-x**2)) + sqrt(pi)*_cos(x**5/(x**3-x**2+pi*x)))'
print
print('frange with f(x) =')
print(fstr)
print('for x=1, ..., %i' % times)
print('in 3 runs including full compile time')
t4 = Timer("frange('lambda x: %s', 0, %i)" % (fstr, times),
'from __main__ import frange')
numpy = import_module('numpy')
print('frange: %.4f %.4f %.4f' % tuple(t4.repeat(3, 1)))
if numpy:
t5 = Timer('x = arange(%i); result = %s' % (times, fstr),
'from numpy import arange, sqrt, exp, sin, cos, exp, pi')
print('numpy: %.4f %.4f %.4f' % tuple(t5.repeat(3, 1)))
def lognormvariate(self, mu, sigma):
return _exp(self.normalvariate(mu, sigma))
def _f_Gauss_spherical(self, sin_theta, W_y, k):
"""2d-Gaussian spectrum amplitude.
Implementation for spherical coordinates.
"""
return _exp(-(k*W_y*sin_theta/2)**2)
def _gauss(x, mu, sigma):
sigma2 = sigma**2
return _exp(-(x-mu)**2/sigma2) / _sqrt(2*_pi*sigma2)
"vonmisesvariate",
"gammavariate",
"triangular",
"gauss",
"betavariate",
"paretovariate",
"weibullvariate",
"getstate",
"setstate",
"jumpahead",
"WichmannHill",
"getrandbits",
"SystemRandom",
]
NV_MAGICCONST = 4 * _exp(-0.5) / _sqrt(2.0)
TWOPI = 2.0 * _pi
LOG4 = _log(4.0)
SG_MAGICCONST = 1.0 + _log(4.5)
BPF = 53 # Number of bits in a float
RECIP_BPF = 2**-BPF
# Translated by Guido van Rossum from C source provided by
# Adrian Baddeley. Adapted by Raymond Hettinger for use with
# the Mersenne Twister and os.urandom() core generators.
import _random
class Random(_random.Random):
"""Random number generator base class used by bound module functions.
def exp(x):
return _exp(x)
def benchmark():
"""
Run some benchmarks for clambdify and frange.
NumPy and Psyco are used as reference if available.
"""
from time import time
from timeit import Timer
def fbenchmark(f, var=[Symbol('x')]):
"""
Do some benchmarks with f using clambdify, lambdify and psyco.
"""
global cf, pf, psyf
start = time()
cf = clambdify(var, f)
print('compile time (including sympy overhead): %f s' %
(time() - start))
pf = lambdify(var, f, 'math')
psyf = None
psyco = import_module('psyco')
if psyco:
psyf = lambdify(var, f, 'math')
psyco.bind(psyf)
code = '''for x in (i/1000. for i in range(1000)):
f(%s)''' % ('x,' * len(var)).rstrip(',')
t1 = Timer(code, 'from __main__ import cf as f')
t2 = Timer(code, 'from __main__ import pf as f')
if psyf:
t3 = Timer(code, 'from __main__ import psyf as f')
else:
t3 = None
print('for x = (0, 1, 2, ..., 999)/1000')
print('20 times in 3 runs')
print('compiled: %.4f %.4f %.4f' % tuple(t1.repeat(3, 20)))
print('Python lambda: %.4f %.4f %.4f' % tuple(t2.repeat(3, 20)))
if t3:
print('Psyco lambda: %.4f %.4f %.4f' % tuple(t3.repeat(3, 20)))
print('big function:')
from sympy import _exp, _sin, _cos, pi, lambdify
x = Symbol('x')
## f1 = diff(_exp(x)**2 - _sin(x)**pi, x) \
## * x**12-2*x**3+2*_exp(x**2)-3*x**7+4*_exp(123+x-x**5+2*x**4) \
## * ((x + pi)**5).expand()
f1 = 2*_exp(x**2) + x**12*(-pi*_sin(x)**((-1) + pi)*_cos(x) + 2*_exp(2*x)) \
+ 4*(10*pi**3*x**2 + 10*pi**2*x**3 + 5*pi*x**4 + 5*x*pi**4 + pi**5
+ x**5)*_exp(123 + x + 2*x**4 - x**5) - 2*x**3 - 3*x**7
fbenchmark(f1)
print()
print('simple function:')
y = Symbol('y')
f2 = sqrt(x * y) + x * 5
fbenchmark(f2, [x, y])
times = 100000
fstr = '_exp(_sin(_exp(-x**2)) + sqrt(pi)*_cos(x**5/(x**3-x**2+pi*x)))'
print
print('frange with f(x) =')
print(fstr)
print('for x=1, ..., %i' % times)
print('in 3 runs including full compile time')
t4 = Timer("frange('lambda x: %s', 0, %i)" % (fstr, times),
'from __main__ import frange')
numpy = import_module('numpy')
print('frange: %.4f %.4f %.4f' % tuple(t4.repeat(3, 1)))
if numpy:
t5 = Timer('x = arange(%i); result = %s' % (times, fstr),
'from numpy import arange, sqrt, exp, sin, cos, exp, pi')
print('numpy: %.4f %.4f %.4f' % tuple(t5.repeat(3, 1)))
def lognormvariate(self, mu, sigma):
return _exp(self.normalvariate(mu, sigma))
def sampling_weight(self):
return _exp(-self.value)
"weibullvariate",
"getstate",
"setstate",
"jumpahead",
"whseed",
]
def _verify(name, computed, expected):
if abs(computed - expected) > 1e-7:
raise ValueError(
"computed value for %s deviates too much " "(computed %g, expected %g)" % (name, computed, expected)
)
NV_MAGICCONST = 4 * _exp(-0.5) / _sqrt(2.0)
_verify("NV_MAGICCONST", NV_MAGICCONST, 1.71552776992141)
TWOPI = 2.0 * _pi
_verify("TWOPI", TWOPI, 6.28318530718)
LOG4 = _log(4.0)
_verify("LOG4", LOG4, 1.38629436111989)
SG_MAGICCONST = 1.0 + _log(4.5)
_verify("SG_MAGICCONST", SG_MAGICCONST, 2.50407739677627)
del _verify
# Translated by Guido van Rossum from C source provided by
# Adrian Baddeley.
def gammavariate(self, alpha: float, beta: float) -> float:
"""Gamma distribution. Not the gamma function!
Conditions on the parameters are alpha > 0 and beta > 0.
The probability distribution function is:
x ** (alpha - 1) * math.exp(-x / beta)
pdf(x) = --------------------------------------
math.gamma(alpha) * beta ** alpha
"""
# alpha > 0, beta > 0, mean is alpha*beta, variance is alpha*beta**2
# Warning: a few older sources define the gamma distribution in terms
# of alpha > -1.0
if alpha <= 0.0 or beta <= 0.0:
raise ValueError('gammavariate: alpha and beta must be > 0.0')
random = self.random
if alpha > 1.0:
# Uses R.C.H. Cheng, "The generation of Gamma
# variables with non-integral shape parameters",
# Applied Statistics, (1977), 26, No. 1, p71-74
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
if not (1e-7 < u1 and u1 < .9999999):
continue
u2 = 1.0 - random()
v = _log(u1/(1.0-u1))/ainv
x = alpha*_exp(v)
z = u1*u1*u2
r = bbb+ccc*v-x
if r + SG_MAGICCONST - 4.5*z >= 0.0 or r >= _log(z):
return x * beta
elif alpha == 1.0:
# expovariate(1)
u = random()
while u <= 1e-7:
u = random()
return -_log(u) * beta
else: # alpha is between 0 and 1 (exclusive)
# Uses ALGORITHM GS of Statistical Computing - Kennedy & Gentle
while 1:
u = random()
b = (_e + alpha)/_e
p = b*u
if p <= 1.0:
x = p ** (1.0/alpha)
else:
x = -_log((b-p)/alpha)
u1 = random()
if p > 1.0:
if u1 <= x ** (alpha - 1.0):
break
elif u1 <= _exp(-x):
break
return x * beta
def gammavariate(self, alpha, beta):
"""Gamma distribution. Not the gamma function!
Conditions on the parameters are alpha > 0 and beta > 0.
"""
# alpha > 0, beta > 0, mean is alpha*beta, variance is alpha*beta**2
# Warning: a few older sources define the gamma distribution in terms
# of alpha > -1.0
if alpha <= 0.0 or beta <= 0.0:
raise ValueError, "gammavariate: alpha and beta must be > 0.0"
random = self.random
if alpha > 1.0:
# Uses R.C.H. Cheng, "The generation of Gamma
# variables with non-integral shape parameters",
# Applied Statistics, (1977), 26, No. 1, p71-74
ainv = _sqrt(2.0 * alpha - 1.0)
bbb = alpha - LOG4
ccc = alpha + ainv
while 1:
u1 = random()
if not 1e-7 < u1 < 0.9999999:
continue
u2 = 1.0 - random()
v = _log(u1 / (1.0 - u1)) / ainv
x = alpha * _exp(v)
z = u1 * u1 * u2
r = bbb + ccc * v - x
if r + SG_MAGICCONST - 4.5 * z >= 0.0 or r >= _log(z):
return x * beta
elif alpha == 1.0:
# expovariate(1)
u = random()
while u <= 1e-7:
u = random()
return -_log(u) * beta
else: # alpha is between 0 and 1 (exclusive)
# Uses ALGORITHM GS of Statistical Computing - Kennedy & Gentle
while 1:
u = random()
b = (_e + alpha) / _e
p = b * u
if p <= 1.0:
x = pow(p, 1.0 / alpha)
else:
# p > 1
x = -_log((b - p) / alpha)
u1 = random()
if not (((p <= 1.0) and (u1 > _exp(-x))) or ((p > 1) and (u1 > pow(x, alpha - 1.0)))):
break
return x * beta
ifile_name, dummy, dummy, draws, separator, klasse_index = hdw.handle_commands(
sys.argv, 'd:', ['separator=', 'classid='])
del dummy
sample_count = 5 ### this can be changed, though the cross-validation
### tends to be too inaccurate with high values
universe = hdw.abstract_file(ifile_name, separator, klasse_index)
gtsigma = hdw.compute_maxvar(universe) ### our limit
pieces = 20 ### how many intervals
graph = [None] * (pieces + 1) ### statistics to plot
print 'file %s, iterating sigma from 0 to %.4f' % (ifile_name.split(
os.sep)[-1], gtsigma)
for h in xrange(pieces + 1):
#sigma=(_exp(h.__float__()/pieces)-1)*gtsigma/(_e-1)
sigma = (_exp(h.__float__() / pieces)**4 - 1) * gtsigma / (_e**4 - 1)
### more little values than greater
print 'step %2d: sigma = %.4f' % (h + 1, sigma)
overall_success = [0] * draws ### per sigma
overall_compress = [0] * draws ### per sigma
for i in xrange(draws):
nsc.welt = {} ### every draw we clear the world
universe = hdw.abstract_file(ifile_name, separator, klasse_index)
### i can't understand this!!! this way we read the file at every draw
### instead of once per run. however, if we don't do this, strange
### things happen and the test go f**k!!!
### probably the universe set() get messy somewhere in the code but i
### can't find where.
