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from __future__ import division, absolute_import, print_function
import sys
from numpy.testing import (TestCase, run_module_suite, assert_,
assert_array_equal, assert_raises)
from numpy import random
from numpy.compat import long
import numpy as np
class TestRegression(TestCase):
def test_VonMises_range(self):
# Make sure generated random variables are in [-pi, pi].
# Regression test for ticket #986.
for mu in np.linspace(-7., 7., 5):
r = random.mtrand.vonmises(mu, 1, 50)
assert_(np.all(r > -np.pi) and np.all(r <= np.pi))
def test_hypergeometric_range(self):
# Test for ticket #921
assert_(np.all(np.random.hypergeometric(3, 18, 11, size=10) < 4))
assert_(np.all(np.random.hypergeometric(18, 3, 11, size=10) > 0))
# Test for ticket #5623
args = [
(2**20 - 2, 2**20 - 2, 2**20 - 2), # Check for 32-bit systems
]
is_64bits = sys.maxsize > 2**32
if is_64bits and sys.platform != 'win32':
args.append((2**40 - 2, 2**40 - 2, 2**40 - 2)) # Check for 64-bit systems
for arg in args:
assert_(np.random.hypergeometric(*arg) > 0)
def test_logseries_convergence(self):
# Test for ticket #923
N = 1000
np.random.seed(0)
rvsn = np.random.logseries(0.8, size=N)
# these two frequency counts should be close to theoretical
# numbers with this large sample
# theoretical large N result is 0.49706795
freq = np.sum(rvsn == 1) / float(N)
msg = "Frequency was %f, should be > 0.45" % freq
assert_(freq > 0.45, msg)
# theoretical large N result is 0.19882718
freq = np.sum(rvsn == 2) / float(N)
msg = "Frequency was %f, should be < 0.23" % freq
assert_(freq < 0.23, msg)
def test_permutation_longs(self):
np.random.seed(1234)
a = np.random.permutation(12)
np.random.seed(1234)
b = np.random.permutation(long(12))
assert_array_equal(a, b)
def test_shuffle_mixed_dimension(self):
# Test for trac ticket #2074
for t in [[1, 2, 3, None],
[(1, 1), (2, 2), (3, 3), None],
[1, (2, 2), (3, 3), None],
[(1, 1), 2, 3, None]]:
np.random.seed(12345)
shuffled = list(t)
random.shuffle(shuffled)
assert_array_equal(shuffled, [t[0], t[3], t[1], t[2]])
def test_call_within_randomstate(self):
# Check that custom RandomState does not call into global state
m = np.random.RandomState()
res = np.array([0, 8, 7, 2, 1, 9, 4, 7, 0, 3])
for i in range(3):
np.random.seed(i)
m.seed(4321)
# If m.state is not honored, the result will change
assert_array_equal(m.choice(10, size=10, p=np.ones(10)/10.), res)
def test_multivariate_normal_size_types(self):
# Test for multivariate_normal issue with 'size' argument.
# Check that the multivariate_normal size argument can be a
# numpy integer.
np.random.multivariate_normal([0], [[0]], size=1)
np.random.multivariate_normal([0], [[0]], size=np.int_(1))
np.random.multivariate_normal([0], [[0]], size=np.int64(1))
def test_beta_small_parameters(self):
# Test that beta with small a and b parameters does not produce
# NaNs due to roundoff errors causing 0 / 0, gh-5851
np.random.seed(1234567890)
x = np.random.beta(0.0001, 0.0001, size=100)
assert_(not np.any(np.isnan(x)), 'Nans in np.random.beta')
def test_choice_sum_of_probs_tolerance(self):
# The sum of probs should be 1.0 with some tolerance.
# For low precision dtypes the tolerance was too tight.
# See numpy github issue 6123.
np.random.seed(1234)
a = [1, 2, 3]
counts = [4, 4, 2]
for dt in np.float16, np.float32, np.float64:
probs = np.array(counts, dtype=dt) / sum(counts)
c = np.random.choice(a, p=probs)
assert_(c in a)
assert_raises(ValueError, np.random.choice, a, p=probs*0.9)
def test_shuffle_of_array_of_different_length_strings(self):
# Test that permuting an array of different length strings
# will not cause a segfault on garbage collection
# Tests gh-7710
np.random.seed(1234)
a = np.array(['a', 'a' * 1000])
for _ in range(100):
np.random.shuffle(a)
# Force Garbage Collection - should not segfault.
import gc
gc.collect()
def test_shuffle_of_array_of_objects(self):
# Test that permuting an array of objects will not cause
# a segfault on garbage collection.
# See gh-7719
np.random.seed(1234)
a = np.array([np.arange(1), np.arange(4)])
for _ in range(1000):
np.random.shuffle(a)
# Force Garbage Collection - should not segfault.
import gc
gc.collect()
if __name__ == "__main__":
run_module_suite()
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