diff options
Diffstat (limited to 'numpy/random/tests/test_generator_mt19937.py')
| -rw-r--r-- | numpy/random/tests/test_generator_mt19937.py | 136 |
1 files changed, 135 insertions, 1 deletions
diff --git a/numpy/random/tests/test_generator_mt19937.py b/numpy/random/tests/test_generator_mt19937.py index 391c33c1a..526275dda 100644 --- a/numpy/random/tests/test_generator_mt19937.py +++ b/numpy/random/tests/test_generator_mt19937.py @@ -4,7 +4,7 @@ import pytest import numpy as np from numpy.testing import ( - assert_, assert_raises, assert_equal, + assert_, assert_raises, assert_equal, assert_allclose, assert_warns, assert_no_warnings, assert_array_equal, assert_array_almost_equal, suppress_warnings) @@ -115,6 +115,140 @@ class TestMultinomial(object): assert_array_equal(non_contig, contig) +class TestMultivariateHypergeometric(object): + + def setup(self): + self.seed = 8675309 + + def test_argument_validation(self): + # Error cases... + + # `colors` must be a 1-d sequence + assert_raises(ValueError, random.multivariate_hypergeometric, + 10, 4) + + # Negative nsample + assert_raises(ValueError, random.multivariate_hypergeometric, + [2, 3, 4], -1) + + # Negative color + assert_raises(ValueError, random.multivariate_hypergeometric, + [-1, 2, 3], 2) + + # nsample exceeds sum(colors) + assert_raises(ValueError, random.multivariate_hypergeometric, + [2, 3, 4], 10) + + # nsample exceeds sum(colors) (edge case of empty colors) + assert_raises(ValueError, random.multivariate_hypergeometric, + [], 1) + + # Validation errors associated with very large values in colors. + assert_raises(ValueError, random.multivariate_hypergeometric, + [999999999, 101], 5, 1, 'marginals') + + int64_info = np.iinfo(np.int64) + max_int64 = int64_info.max + max_int64_index = max_int64 // int64_info.dtype.itemsize + assert_raises(ValueError, random.multivariate_hypergeometric, + [max_int64_index - 100, 101], 5, 1, 'count') + + @pytest.mark.parametrize('method', ['count', 'marginals']) + def test_edge_cases(self, method): + # Set the seed, but in fact, all the results in this test are + # deterministic, so we don't really need this. + random = Generator(MT19937(self.seed)) + + x = random.multivariate_hypergeometric([0, 0, 0], 0, method=method) + assert_array_equal(x, [0, 0, 0]) + + x = random.multivariate_hypergeometric([], 0, method=method) + assert_array_equal(x, []) + + x = random.multivariate_hypergeometric([], 0, size=1, method=method) + assert_array_equal(x, np.empty((1, 0), dtype=np.int64)) + + x = random.multivariate_hypergeometric([1, 2, 3], 0, method=method) + assert_array_equal(x, [0, 0, 0]) + + x = random.multivariate_hypergeometric([9, 0, 0], 3, method=method) + assert_array_equal(x, [3, 0, 0]) + + colors = [1, 1, 0, 1, 1] + x = random.multivariate_hypergeometric(colors, sum(colors), + method=method) + assert_array_equal(x, colors) + + x = random.multivariate_hypergeometric([3, 4, 5], 12, size=3, + method=method) + assert_array_equal(x, [[3, 4, 5]]*3) + + # Cases for nsample: + # nsample < 10 + # 10 <= nsample < colors.sum()/2 + # colors.sum()/2 < nsample < colors.sum() - 10 + # colors.sum() - 10 < nsample < colors.sum() + @pytest.mark.parametrize('nsample', [8, 25, 45, 55]) + @pytest.mark.parametrize('method', ['count', 'marginals']) + @pytest.mark.parametrize('size', [5, (2, 3), 150000]) + def test_typical_cases(self, nsample, method, size): + random = Generator(MT19937(self.seed)) + + colors = np.array([10, 5, 20, 25]) + sample = random.multivariate_hypergeometric(colors, nsample, size, + method=method) + if isinstance(size, int): + expected_shape = (size,) + colors.shape + else: + expected_shape = size + colors.shape + assert_equal(sample.shape, expected_shape) + assert_((sample >= 0).all()) + assert_((sample <= colors).all()) + assert_array_equal(sample.sum(axis=-1), + np.full(size, fill_value=nsample, dtype=int)) + if isinstance(size, int) and size >= 100000: + # This sample is large enough to compare its mean to + # the expected values. + assert_allclose(sample.mean(axis=0), + nsample * colors / colors.sum(), + rtol=1e-3, atol=0.005) + + def test_repeatability1(self): + random = Generator(MT19937(self.seed)) + sample = random.multivariate_hypergeometric([3, 4, 5], 5, size=5, + method='count') + expected = np.array([[2, 1, 2], + [2, 1, 2], + [1, 1, 3], + [2, 0, 3], + [2, 1, 2]]) + assert_array_equal(sample, expected) + + def test_repeatability2(self): + random = Generator(MT19937(self.seed)) + sample = random.multivariate_hypergeometric([20, 30, 50], 50, + size=5, + method='marginals') + expected = np.array([[ 9, 17, 24], + [ 7, 13, 30], + [ 9, 15, 26], + [ 9, 17, 24], + [12, 14, 24]]) + assert_array_equal(sample, expected) + + def test_repeatability3(self): + random = Generator(MT19937(self.seed)) + sample = random.multivariate_hypergeometric([20, 30, 50], 12, + size=5, + method='marginals') + expected = np.array([[2, 3, 7], + [5, 3, 4], + [2, 5, 5], + [5, 3, 4], + [1, 5, 6]]) + assert_array_equal(sample, expected) + + class TestSetState(object): def setup(self): self.seed = 1234567890 |