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from __future__ import division, print_function, absolute_import
import numpy as np
from numpy.testing import assert_equal, assert_
from pytest import raises as assert_raises
from scipy._lib._util import _aligned_zeros, check_random_state
def test__aligned_zeros():
niter = 10
def check(shape, dtype, order, align):
err_msg = repr((shape, dtype, order, align))
x = _aligned_zeros(shape, dtype, order, align=align)
if align is None:
align = np.dtype(dtype).alignment
assert_equal(x.__array_interface__['data'][0] % align, 0)
if hasattr(shape, '__len__'):
assert_equal(x.shape, shape, err_msg)
else:
assert_equal(x.shape, (shape,), err_msg)
assert_equal(x.dtype, dtype)
if order == "C":
assert_(x.flags.c_contiguous, err_msg)
elif order == "F":
if x.size > 0:
# Size-0 arrays get invalid flags on Numpy 1.5
assert_(x.flags.f_contiguous, err_msg)
elif order is None:
assert_(x.flags.c_contiguous, err_msg)
else:
raise ValueError()
# try various alignments
for align in [1, 2, 3, 4, 8, 16, 32, 64, None]:
for n in [0, 1, 3, 11]:
for order in ["C", "F", None]:
for dtype in [np.uint8, np.float64]:
for shape in [n, (1, 2, 3, n)]:
for j in range(niter):
check(shape, dtype, order, align)
def test_check_random_state():
# If seed is None, return the RandomState singleton used by np.random.
# If seed is an int, return a new RandomState instance seeded with seed.
# If seed is already a RandomState instance, return it.
# Otherwise raise ValueError.
rsi = check_random_state(1)
assert_equal(type(rsi), np.random.RandomState)
rsi = check_random_state(rsi)
assert_equal(type(rsi), np.random.RandomState)
rsi = check_random_state(None)
assert_equal(type(rsi), np.random.RandomState)
assert_raises(ValueError, check_random_state, 'a')
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