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import numpy as np | ||
import pytest | ||
from numpy.testing import assert_almost_equal | ||
from wildboar.datasets import load_gun_point | ||
from wildboar.distance.lb import ( | ||
DtwKeoghLowerBound, | ||
DtwKimLowerBound, | ||
PaaLowerBound, | ||
SaxLowerBound, | ||
) | ||
from wildboar.utils._testing import ( | ||
assert_exhaustive_parameter_checks, | ||
assert_parameter_checks, | ||
) | ||
from wildboar.utils.estimator_checks import check_estimator | ||
|
||
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||
@pytest.mark.parametrize( | ||
"estimator", | ||
[ | ||
DtwKeoghLowerBound(), | ||
DtwKimLowerBound(), | ||
PaaLowerBound(), | ||
SaxLowerBound(), | ||
], | ||
) | ||
def test_estimator_checks(estimator): | ||
check_estimator(estimator) | ||
assert_parameter_checks(estimator) | ||
assert_exhaustive_parameter_checks(estimator) | ||
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@pytest.mark.parametrize( | ||
"r,expected", | ||
[ | ||
( | ||
0.1, | ||
np.array( | ||
[ | ||
[3.30092013, 2.61546763, 1.75774304, 1.98565672, 3.05331929], | ||
[3.59510336, 3.58114675, 2.67428025, 3.00632452, 4.53328931], | ||
[4.19370778, 5.18038046, 3.78883294, 4.8289548, 7.57916512], | ||
] | ||
), | ||
), | ||
( | ||
0.5, | ||
np.array( | ||
[ | ||
[1.8704832, 2.15211288, 1.6825272, 1.63988294, 2.68757666], | ||
[3.04895091, 3.27976414, 2.48781032, 2.84358674, 3.7759067], | ||
[3.72037408, 3.92365404, 3.20265619, 3.52869195, 4.39514919], | ||
] | ||
), | ||
), | ||
( | ||
1.0, | ||
np.array( | ||
[ | ||
[1.8704832, 2.15211288, 1.45662298, 1.63988294, 2.68757666], | ||
[3.04895091, 3.27976414, 2.48781032, 2.84358674, 3.7759067], | ||
[3.72037408, 3.92365404, 3.20265619, 3.52869195, 4.39514919], | ||
] | ||
), | ||
), | ||
], | ||
) | ||
def test_dtw_keogh_lower_bound(r, expected): | ||
X, y = load_gun_point() | ||
Y = X[:5] | ||
X = X[10:13] | ||
|
||
actual = DtwKeoghLowerBound(r=r).fit(Y).transform(X) | ||
assert_almost_equal(actual, expected) | ||
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def test_dtw_kim_lower_bound(): | ||
X, y = load_gun_point() | ||
Y = X[:5] | ||
X = X[10:13] | ||
expected = np.array( | ||
[ | ||
[0.40783531, 0.42069802, 0.21365168, 0.19725256, 0.46663072], | ||
[1.37084334, 1.38671857, 0.86028071, 0.88235554, 1.52141843], | ||
[1.13174997, 1.13667356, 0.65664954, 0.68616908, 1.26697248], | ||
] | ||
) | ||
actual = DtwKimLowerBound().fit(Y).transform(X) | ||
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assert_almost_equal(actual, expected) | ||
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@pytest.mark.parametrize("lower_bound", [DtwKeoghLowerBound(), DtwKimLowerBound()]) | ||
@pytest.mark.parametrize("r", np.linspace(0, 1, 10, endpoint=True)) | ||
def test_dtw_lower_bound_lower_bounds_dtw(lower_bound, r): | ||
from wildboar.distance import pairwise_distance | ||
|
||
X, _ = load_gun_point() | ||
X = X[:30] | ||
distance = pairwise_distance(X, metric="dtw", metric_params={"r": r}) | ||
if hasattr(lower_bound, "r"): | ||
lower_bound.set_params(r=r) | ||
lower_bound = lower_bound.fit_transform(X) | ||
assert (lower_bound <= distance).all() | ||
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@pytest.mark.parametrize("n_bins", [2, 10, 20, 50, 100]) | ||
@pytest.mark.parametrize("n_intervals", [10, 12, 18, 22]) | ||
def test_sax_lower_bounds_euclidean(n_bins, n_intervals): | ||
from wildboar.datasets.preprocess import standardize | ||
from wildboar.distance import pairwise_distance | ||
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X, _ = load_gun_point() | ||
X = standardize(X[:30]) | ||
distance = pairwise_distance(X, metric="euclidean") | ||
lower_bound = SaxLowerBound(n_intervals=n_intervals, n_bins=n_bins).fit_transform(X) | ||
assert (lower_bound <= distance).all() | ||
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@pytest.mark.parametrize("n_intervals", [10, 12, 18, 22]) | ||
def test_paa_lower_bounds_euclidean(n_intervals): | ||
from wildboar.datasets.preprocess import standardize | ||
from wildboar.distance import pairwise_distance | ||
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||
X, _ = load_gun_point() | ||
X = standardize(X[:30]) | ||
distance = pairwise_distance(X, metric="euclidean") | ||
lower_bound = PaaLowerBound(n_intervals=n_intervals).fit_transform(X) | ||
assert (lower_bound <= distance).all() |