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-rw-r--r--test/test_sliced.py85
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diff --git a/test/test_sliced.py b/test/test_sliced.py
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+"""Tests for module sliced"""
+
+# Author: Adrien Corenflos <adrien.corenflos@aalto.fi>
+#
+# License: MIT License
+
+import numpy as np
+import pytest
+
+import ot
+from ot.sliced import get_random_projections
+
+
+def test_get_random_projections():
+ rng = np.random.RandomState(0)
+ projections = get_random_projections(1000, 50, rng)
+ np.testing.assert_almost_equal(np.sum(projections ** 2, 1), 1.)
+
+
+def test_sliced_same_dist():
+ n = 100
+ rng = np.random.RandomState(0)
+
+ x = rng.randn(n, 2)
+ u = ot.utils.unif(n)
+
+ res = ot.sliced_wasserstein_distance(x, x, u, u, 10, seed=rng)
+ np.testing.assert_almost_equal(res, 0.)
+
+
+def test_sliced_bad_shapes():
+ n = 100
+ rng = np.random.RandomState(0)
+
+ x = rng.randn(n, 2)
+ y = rng.randn(n, 4)
+ u = ot.utils.unif(n)
+
+ with pytest.raises(ValueError):
+ _ = ot.sliced_wasserstein_distance(x, y, u, u, 10, seed=rng)
+
+
+def test_sliced_log():
+ n = 100
+ rng = np.random.RandomState(0)
+
+ x = rng.randn(n, 4)
+ y = rng.randn(n, 4)
+ u = ot.utils.unif(n)
+
+ res, log = ot.sliced_wasserstein_distance(x, y, u, u, 10, seed=rng, log=True)
+ assert len(log) == 2
+ projections = log["projections"]
+ projected_emds = log["projected_emds"]
+
+ assert len(projections) == len(projected_emds) == 10
+ for emd in projected_emds:
+ assert emd > 0
+
+
+def test_sliced_different_dists():
+ n = 100
+ rng = np.random.RandomState(0)
+
+ x = rng.randn(n, 2)
+ u = ot.utils.unif(n)
+ y = rng.randn(n, 2)
+
+ res = ot.sliced_wasserstein_distance(x, y, u, u, 10, seed=rng)
+ assert res > 0.
+
+
+def test_1d_sliced_equals_emd():
+ n = 100
+ m = 120
+ rng = np.random.RandomState(0)
+
+ x = rng.randn(n, 1)
+ a = rng.uniform(0, 1, n)
+ a /= a.sum()
+ y = rng.randn(m, 1)
+ u = ot.utils.unif(m)
+ res = ot.sliced_wasserstein_distance(x, y, a, u, 10, seed=42)
+ expected = ot.emd2_1d(x.squeeze(), y.squeeze(), a, u)
+ np.testing.assert_almost_equal(res ** 2, expected)