def setUp(self):
self.n_samples = 10
self.SO3_GROUP = SpecialOrthogonalGroup(n=3)
self.SE3_GROUP = SpecialEuclideanGroup(n=3)
self.S1 = Hypersphere(dimension=1)
self.S2 = Hypersphere(dimension=2)
self.H2 = HyperbolicSpace(dimension=2)
plt.figure()
def main():
fig = plt.figure(figsize=(15, 5))
hyperbolic_plane = HyperbolicSpace(dimension=2)
data = hyperbolic_plane.random_uniform(n_samples=140)
mean = hyperbolic_plane.metric.mean(data)
tpca = TangentPCA(metric=hyperbolic_plane.metric, n_components=2)
tpca = tpca.fit(data, base_point=mean)
tangent_projected_data = tpca.transform(data)
geodesic_0 = hyperbolic_plane.metric.geodesic(
initial_point=mean, initial_tangent_vec=tpca.components_[0])
geodesic_1 = hyperbolic_plane.metric.geodesic(
initial_point=mean, initial_tangent_vec=tpca.components_[1])
n_steps = 100
t = np.linspace(-1, 1, n_steps)
geodesic_points_0 = geodesic_0(t)
geodesic_points_1 = geodesic_1(t)
print('Coordinates of the Log of the first 5 data points at the mean, '
'projected on the principal components:')
print(tangent_projected_data[:5])
ax_var = fig.add_subplot(121)
xticks = np.arange(1, 2 + 1, 1)
ax_var.xaxis.set_ticks(xticks)
ax_var.set_title('Explained variance')
ax_var.set_xlabel('Number of Principal Components')
ax_var.set_ylim((0, 1))
ax_var.plot(xticks, tpca.explained_variance_ratio_)
ax = fig.add_subplot(122)
visualization.plot(mean,
ax,
space='H2_poincare_disk',
color='darkgreen',
s=10)
visualization.plot(geodesic_points_0,
ax,
space='H2_poincare_disk',
linewidth=2)
visualization.plot(geodesic_points_1,
ax,
space='H2_poincare_disk',
linewidth=2)
visualization.plot(data,
ax,
space='H2_poincare_disk',
color='black',
alpha=0.7)
plt.show()
def test_scaled_distance(self):
point_a_intrinsic = gs.array([1, 2, 3])
point_b_intrinsic = gs.array([4, 5, 6])
point_a = self.space.intrinsic_to_extrinsic_coords(point_a_intrinsic)
point_b = self.space.intrinsic_to_extrinsic_coords(point_b_intrinsic)
scale = 2
default_space = HyperbolicSpace(dimension=self.dimension)
scaled_space = HyperbolicSpace(dimension=self.dimension, scale=2)
distance_default_metric = default_space.metric.dist(point_a, point_b)
distance_scaled_metric = scaled_space.metric.dist(point_a, point_b)
result = distance_scaled_metric
expected = scale * distance_default_metric
self.assertAllClose(result, expected)
def test_exp_and_belongs(self):
H2 = HyperbolicSpace(dimension=2)
METRIC = H2.metric
base_point = gs.array([1., 0., 0.])
with self.session():
self.assertTrue(gs.eval(H2.belongs(base_point)))
tangent_vec = H2.projection_to_tangent_space(vector=gs.array(
[1., 2., 1.]),
base_point=base_point)
exp = METRIC.exp(tangent_vec=tangent_vec, base_point=base_point)
with self.session():
self.assertTrue(gs.eval(H2.belongs(exp)))
def test_scaled_squared_norm(self):
base_point_intrinsic = gs.array([1, 1, 1])
base_point = self.space.intrinsic_to_extrinsic_coords(
base_point_intrinsic)
tangent_vec = gs.array([1, 2, 3, 4])
tangent_vec = self.space.projection_to_tangent_space(
tangent_vec, base_point)
scale = 2
default_space = HyperbolicSpace(dimension=self.dimension)
scaled_space = HyperbolicSpace(dimension=self.dimension, scale=2)
squared_norm_default_metric = default_space.metric.squared_norm(
tangent_vec, base_point)
squared_norm_scaled_metric = scaled_space.metric.squared_norm(
tangent_vec, base_point)
result = squared_norm_scaled_metric
expected = scale**2 * squared_norm_default_metric
self.assertAllClose(result, expected)
class TestVisualizationMethods(geomstats.tests.TestCase):
def setUp(self):
self.n_samples = 10
self.SO3_GROUP = SpecialOrthogonalGroup(n=3)
self.SE3_GROUP = SpecialEuclideanGroup(n=3)
self.S1 = Hypersphere(dimension=1)
self.S2 = Hypersphere(dimension=2)
self.H2 = HyperbolicSpace(dimension=2)
plt.figure()
@geomstats.tests.np_only
def test_plot_points_so3(self):
points = self.SO3_GROUP.random_uniform(self.n_samples)
visualization.plot(points, space='SO3_GROUP')
@geomstats.tests.np_only
def test_plot_points_se3(self):
points = self.SE3_GROUP.random_uniform(self.n_samples)
visualization.plot(points, space='SE3_GROUP')
@geomstats.tests.np_only
def test_plot_points_s1(self):
points = self.S1.random_uniform(self.n_samples)
visualization.plot(points, space='S1')
@geomstats.tests.np_only
def test_plot_points_s2(self):
points = self.S2.random_uniform(self.n_samples)
visualization.plot(points, space='S2')
@geomstats.tests.np_only
def test_plot_points_h2_poincare_disk(self):
points = self.H2.random_uniform(self.n_samples)
visualization.plot(points, space='H2_poincare_disk')
@geomstats.tests.np_only
def test_plot_points_h2_poincare_half_plane(self):
points = self.H2.random_uniform(self.n_samples)
visualization.plot(points, space='H2_poincare_half_plane')
@geomstats.tests.np_only
def test_plot_points_h2_klein_disk(self):
points = self.H2.random_uniform(self.n_samples)
visualization.plot(points, space='H2_klein_disk')
def __init__(self, n_disks, point_type='ball'):
self.n_disks = n_disks
self.point_type = point_type
disk = HyperbolicSpace(dimension=2, point_type=point_type)
list_disks = [
disk,
] * n_disks
super(PoincarePolydisk, self).__init__(manifolds=list_disks)
self.metric = PoincarePolydiskMetric(n_disks=n_disks,
point_type=point_type)
def test_scaled_inner_product(self):
base_point_intrinsic = gs.array([1, 1, 1])
base_point = self.space.intrinsic_to_extrinsic_coords(
base_point_intrinsic)
tangent_vec_a = gs.array([1, 2, 3, 4])
tangent_vec_b = gs.array([5, 6, 7, 8])
tangent_vec_a = self.space.projection_to_tangent_space(
tangent_vec_a, base_point)
tangent_vec_b = self.space.projection_to_tangent_space(
tangent_vec_b, base_point)
scale = 2
default_space = HyperbolicSpace(dimension=self.dimension)
scaled_space = HyperbolicSpace(dimension=self.dimension, scale=2)
inner_product_default_metric = default_space.metric.inner_product(
tangent_vec_a, tangent_vec_b, base_point)
inner_product_scaled_metric = scaled_space.metric.inner_product(
tangent_vec_a, tangent_vec_b, base_point)
result = inner_product_scaled_metric
expected = scale**2 * inner_product_default_metric
self.assertAllClose(result, expected)
def test_product_distance_extrinsic_representation(self):
point_type = 'extrinsic'
point_a_intrinsic = gs.array([0.01, 0.0])
point_b_intrinsic = gs.array([0.0, 0.0])
hyperbolic_space = HyperbolicSpace(dimension=2, point_type=point_type)
point_a = hyperbolic_space.intrinsic_to_extrinsic_coords(
point_a_intrinsic)
point_b = hyperbolic_space.intrinsic_to_extrinsic_coords(
point_b_intrinsic)
duplicate_point_a = gs.zeros((2,) + point_a.shape)
duplicate_point_a[0] = point_a
duplicate_point_a[1] = point_a
duplicate_point_b = gs.zeros((2,) + point_b.shape)
duplicate_point_b[0] = point_b
duplicate_point_b[1] = point_b
single_disk = PoincarePolydisk(n_disks=1, point_type=point_type)
two_disks = PoincarePolydisk(n_disks=2, point_type=point_type)
distance_single_disk = single_disk.metric.dist(point_a, point_b)
distance_two_disks = two_disks.metric.dist(
duplicate_point_a, duplicate_point_b)
result = distance_two_disks
expected = 3 ** 0.5 * distance_single_disk
self.assertAllClose(result, expected)
def setUp(self):
gs.random.seed(1234)
self.dimension = 2
self.extrinsic_manifold = HyperbolicSpace(dimension=self.dimension)
self.ball_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='ball')
self.intrinsic_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='intrinsic')
self.half_plane_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='half-plane')
self.ball_metric = HyperbolicMetric(dimension=self.dimension,
point_type='ball')
self.extrinsic_metric = HyperbolicMetric(dimension=self.dimension,
point_type='extrinsic')
self.n_samples = 10
def intrinsic_to_extrinsic_coords(self, point_intrinsic):
"""
Convert the parameterization of a point on the Hyperbolic space
from its intrinsic coordinates, to its extrinsic coordinates
in Minkowski space.
Parameters
----------
point_intrinsic : array-like, shape=[n_diskx, n_samples, dimension]
Returns
-------
point_extrinsic : array-like, shape=[n_disks, n_samples, dimension + 1]
"""
n_disks = point_intrinsic.shape[0]
return gs.array([
HyperbolicSpace._intrinsic_to_extrinsic_coordinates(
point_intrinsic[i_disks, ...]) for i_disks in range(n_disks)
])
def test_distance_ball_extrinsic_from_extr_5_dim(self):
x_int = gs.array([[10, 0.2, 3, 4]])
y_int = gs.array([[1, 6, 2., 1]])
extrinsic_manifold = HyperbolicSpace(4, point_type='extrinsic')
ball_metric = HyperbolicMetric(4, point_type='ball')
extrinsic_metric = HyperbolicMetric(4, point_type='extrinsic')
x_extr = extrinsic_manifold.from_coordinates(
x_int, from_point_type='intrinsic')
y_extr = extrinsic_manifold.from_coordinates(
y_int, from_point_type='intrinsic')
x_ball = extrinsic_manifold.to_coordinates(x_extr,
to_point_type='ball')
y_ball = extrinsic_manifold.to_coordinates(y_extr,
to_point_type='ball')
dst_ball = ball_metric.dist(x_ball, y_ball)
dst_extr = extrinsic_metric.dist(x_extr, y_extr)
self.assertAllClose(dst_ball, dst_extr)
def main():
cluster_1 = gs.random.uniform(low=0.5, high=0.6, size=(20, 2))
cluster_2 = gs.random.uniform(low=0, high=-0.2, size=(20, 2))
ax = plt.gca()
merged_clusters = gs.concatenate((cluster_1, cluster_2), axis=0)
manifold = HyperbolicSpace(dimension=2, point_type='ball')
metric = HyperbolicMetric(dimension=2, point_type='ball')
visualization.plot(merged_clusters,
ax=ax,
space='H2_poincare_disk',
marker='.',
color='black',
point_type=manifold.point_type)
kmeans = RiemannianKMeans(
riemannian_metric=metric,
n_clusters=2,
init='random',
)
centroids = kmeans.fit(X=merged_clusters, max_iter=1)
labels = kmeans.predict(X=merged_clusters)
visualization.plot(centroids,
ax=ax,
space='H2_poincare_disk',
marker='.',
color='red',
point_type=manifold.point_type)
print('Data_labels', labels)
plt.show()
"""Plot geodesics in H2.
Plot a geodesic on the Hyperbolic space H2.
With Poincare Disk visualization.
"""
import os
import matplotlib.pyplot as plt
import numpy as np
import geomstats.visualization as visualization
from geomstats.geometry.hyperbolic_space import HyperbolicSpace
H2 = HyperbolicSpace(dimension=2)
METRIC = H2.metric
def plot_geodesic_between_two_points(initial_point,
end_point,
n_steps=10,
ax=None):
assert H2.belongs(initial_point)
assert H2.belongs(end_point)
geodesic = METRIC.geodesic(initial_point=initial_point,
end_point=end_point)
t = np.linspace(0, 1, n_steps)
points = geodesic(t)
visualization.plot(points, ax=ax, space='H2_poincare_disk')
class TestHyperbolicSpaceMethods(geomstats.tests.TestCase):
_multiprocess_can_split_ = True
def setUp(self):
gs.random.seed(1234)
self.dimension = 3
self.space = HyperbolicSpace(dimension=self.dimension)
self.metric = self.space.metric
self.n_samples = 10
def test_random_uniform_and_belongs(self):
point = self.space.random_uniform()
result = self.space.belongs(point)
expected = gs.array([[True]])
self.assertAllClose(result, expected)
def test_random_uniform(self):
result = self.space.random_uniform()
self.assertAllClose(gs.shape(result), (1, self.dimension + 1))
def test_intrinsic_and_extrinsic_coords(self):
"""
Test that the composition of
intrinsic_to_extrinsic_coords and
extrinsic_to_intrinsic_coords
gives the identity.
"""
point_int = gs.ones(self.dimension)
point_ext = self.space.intrinsic_to_extrinsic_coords(point_int)
result = self.space.extrinsic_to_intrinsic_coords(point_ext)
expected = point_int
expected = helper.to_vector(expected)
self.assertAllClose(result, expected)
point_ext = gs.array([2.0, 1.0, 1.0, 1.0])
point_int = self.space.extrinsic_to_intrinsic_coords(point_ext)
result = self.space.intrinsic_to_extrinsic_coords(point_int)
expected = point_ext
expected = helper.to_vector(expected)
self.assertAllClose(result, expected)
def test_intrinsic_and_extrinsic_coords_vectorization(self):
"""
Test that the composition of
intrinsic_to_extrinsic_coords and
extrinsic_to_intrinsic_coords
gives the identity.
"""
point_int = gs.array([[.1, 0., 0., .1, 0.,
0.], [.1, .1, .1, .4, .1, 0.],
[.1, .3, 0., .1, 0., 0.],
[-0.1, .1, -.4, .1, -.01, 0.],
[0., 0., .1, .1, -0.08, -0.1],
[.1, .1, .1, .1, 0., -0.5]])
point_ext = self.space.intrinsic_to_extrinsic_coords(point_int)
result = self.space.extrinsic_to_intrinsic_coords(point_ext)
expected = point_int
expected = helper.to_vector(expected)
self.assertAllClose(result, expected)
point_ext = gs.array([[2., 1., 1., 1.], [4., 1., 3.,
math.sqrt(5.)],
[3., 2., 0., 2.]])
point_int = self.space.extrinsic_to_intrinsic_coords(point_ext)
result = self.space.intrinsic_to_extrinsic_coords(point_int)
expected = point_ext
expected = helper.to_vector(expected)
self.assertAllClose(result, expected)
def test_log_and_exp_general_case(self):
"""
Test that the riemannian exponential
and the riemannian logarithm are inverse.
Expect their composition to give the identity function.
"""
# Riemannian Log then Riemannian Exp
# General case
base_point = gs.array([4.0, 1., 3.0, math.sqrt(5.)])
point = gs.array([2.0, 1.0, 1.0, 1.0])
log = self.metric.log(point=point, base_point=base_point)
result = self.metric.exp(tangent_vec=log, base_point=base_point)
expected = helper.to_vector(point)
self.assertAllClose(result, expected)
def test_exp_and_belongs(self):
H2 = HyperbolicSpace(dimension=2)
METRIC = H2.metric
base_point = gs.array([1., 0., 0.])
with self.session():
self.assertTrue(gs.eval(H2.belongs(base_point)))
tangent_vec = H2.projection_to_tangent_space(vector=gs.array(
[1., 2., 1.]),
base_point=base_point)
exp = METRIC.exp(tangent_vec=tangent_vec, base_point=base_point)
with self.session():
self.assertTrue(gs.eval(H2.belongs(exp)))
def test_exp_vectorization(self):
n_samples = 3
dim = self.dimension + 1
one_vec = gs.array([2.0, 1.0, 1.0, 1.0])
one_base_point = gs.array([4.0, 3., 1.0, math.sqrt(5)])
n_vecs = gs.array([[2., 1., 1., 1.], [4., 1., 3.,
math.sqrt(5.)], [3., 2., 0.,
2.]])
n_base_points = gs.array(
[[2.0, 0.0, 1.0, math.sqrt(2)],
[5.0, math.sqrt(8), math.sqrt(8),
math.sqrt(8)], [1.0, 0.0, 0.0, 0.0]])
one_tangent_vec = self.space.projection_to_tangent_space(
one_vec, base_point=one_base_point)
result = self.metric.exp(one_tangent_vec, one_base_point)
self.assertAllClose(gs.shape(result), (1, dim))
n_tangent_vecs = self.space.projection_to_tangent_space(
n_vecs, base_point=one_base_point)
result = self.metric.exp(n_tangent_vecs, one_base_point)
self.assertAllClose(gs.shape(result), (n_samples, dim))
expected = np.zeros((n_samples, dim))
with self.session():
for i in range(n_samples):
expected[i] = gs.eval(
self.metric.exp(n_tangent_vecs[i], one_base_point))
expected = helper.to_vector(gs.array(expected))
self.assertAllClose(result, expected)
one_tangent_vec = self.space.projection_to_tangent_space(
one_vec, base_point=n_base_points)
result = self.metric.exp(one_tangent_vec, n_base_points)
self.assertAllClose(gs.shape(result), (n_samples, dim))
expected = np.zeros((n_samples, dim))
with self.session():
for i in range(n_samples):
expected[i] = gs.eval(
self.metric.exp(one_tangent_vec[i], n_base_points[i]))
expected = helper.to_vector(gs.array(expected))
self.assertAllClose(result, expected)
n_tangent_vecs = self.space.projection_to_tangent_space(
n_vecs, base_point=n_base_points)
result = self.metric.exp(n_tangent_vecs, n_base_points)
self.assertAllClose(gs.shape(result), (n_samples, dim))
expected = np.zeros((n_samples, dim))
with self.session():
for i in range(n_samples):
expected[i] = gs.eval(
self.metric.exp(n_tangent_vecs[i], n_base_points[i]))
expected = helper.to_vector(gs.array(expected))
self.assertAllClose(result, expected)
def test_log_vectorization(self):
n_samples = 3
dim = self.dimension + 1
one_point = gs.array([2.0, 1.0, 1.0, 1.0])
one_base_point = gs.array([4.0, 3., 1.0, math.sqrt(5)])
n_points = gs.array([[2.0, 1.0, 1.0,
1.0], [4.0, 1., 3.0, math.sqrt(5)],
[3.0, 2.0, 0.0, 2.0]])
n_base_points = gs.array(
[[2.0, 0.0, 1.0, math.sqrt(2)],
[5.0, math.sqrt(8), math.sqrt(8),
math.sqrt(8)], [1.0, 0.0, 0.0, 0.0]])
result = self.metric.log(one_point, one_base_point)
self.assertAllClose(gs.shape(result), (1, dim))
result = self.metric.log(n_points, one_base_point)
self.assertAllClose(gs.shape(result), (n_samples, dim))
result = self.metric.log(one_point, n_base_points)
self.assertAllClose(gs.shape(result), (n_samples, dim))
result = self.metric.log(n_points, n_base_points)
self.assertAllClose(gs.shape(result), (n_samples, dim))
def test_inner_product(self):
"""
Test that the inner product between two tangent vectors
is the Minkowski inner product.
"""
minkowski_space = MinkowskiSpace(self.dimension + 1)
base_point = gs.array(
[1.16563816, 0.36381045, -0.47000603, 0.07381469])
tangent_vec_a = self.space.projection_to_tangent_space(
vector=gs.array([10., 200., 1., 1.]), base_point=base_point)
tangent_vec_b = self.space.projection_to_tangent_space(
vector=gs.array([11., 20., -21., 0.]), base_point=base_point)
result = self.metric.inner_product(tangent_vec_a, tangent_vec_b,
base_point)
expected = minkowski_space.metric.inner_product(
tangent_vec_a, tangent_vec_b, base_point)
with self.session():
self.assertAllClose(result, expected)
def test_squared_norm_and_squared_dist(self):
"""
Test that the squared distance between two points is
the squared norm of their logarithm.
"""
point_a = gs.array([2.0, 1.0, 1.0, 1.0])
point_b = gs.array([4.0, 1., 3.0, math.sqrt(5)])
log = self.metric.log(point=point_a, base_point=point_b)
result = self.metric.squared_norm(vector=log)
expected = self.metric.squared_dist(point_a, point_b)
with self.session():
self.assertAllClose(result, expected)
def test_norm_and_dist(self):
"""
Test that the distance between two points is
the norm of their logarithm.
"""
point_a = gs.array([2.0, 1.0, 1.0, 1.0])
point_b = gs.array([4.0, 1., 3.0, math.sqrt(5)])
log = self.metric.log(point=point_a, base_point=point_b)
result = self.metric.norm(vector=log)
expected = self.metric.dist(point_a, point_b)
with self.session():
self.assertAllClose(result, expected)
def test_log_and_exp_edge_case(self):
"""
Test that the riemannian exponential
and the riemannian logarithm are inverse.
Expect their composition to give the identity function.
"""
# Riemannian Log then Riemannian Exp
# Edge case: two very close points, base_point_2 and point_2,
# form an angle < epsilon
base_point_intrinsic = gs.array([1., 2., 3.])
base_point = self.space.intrinsic_to_extrinsic_coords(
base_point_intrinsic)
point_intrinsic = (base_point_intrinsic +
1e-12 * gs.array([-1., -2., 1.]))
point = self.space.intrinsic_to_extrinsic_coords(point_intrinsic)
log = self.metric.log(point=point, base_point=base_point)
result = self.metric.exp(tangent_vec=log, base_point=base_point)
expected = point
with self.session():
self.assertAllClose(result, expected)
@geomstats.tests.np_and_tf_only
def test_exp_and_log_and_projection_to_tangent_space_general_case(self):
"""
Test that the riemannian exponential
and the riemannian logarithm are inverse.
Expect their composition to give the identity function.
"""
# Riemannian Exp then Riemannian Log
# General case
base_point = gs.array([4.0, 1., 3.0, math.sqrt(5)])
vector = gs.array([2.0, 1.0, 1.0, 1.0])
vector = self.space.projection_to_tangent_space(vector=vector,
base_point=base_point)
exp = self.metric.exp(tangent_vec=vector, base_point=base_point)
result = self.metric.log(point=exp, base_point=base_point)
expected = vector
with self.session():
self.assertAllClose(result, expected)
def test_dist(self):
# Distance between a point and itself is 0.
point_a = gs.array([4.0, 1., 3.0, math.sqrt(5)])
point_b = point_a
result = self.metric.dist(point_a, point_b)
expected = gs.array([[0]])
with self.session():
self.assertAllClose(result, expected)
def test_exp_and_dist_and_projection_to_tangent_space(self):
base_point = gs.array([4.0, 1., 3.0, math.sqrt(5)])
vector = gs.array([0.001, 0., -.00001, -.00003])
tangent_vec = self.space.projection_to_tangent_space(
vector=vector, base_point=base_point)
exp = self.metric.exp(tangent_vec=tangent_vec, base_point=base_point)
result = self.metric.dist(base_point, exp)
sq_norm = self.metric.embedding_metric.squared_norm(tangent_vec)
expected = sq_norm
with self.session():
self.assertAllClose(result, expected, atol=1e-2)
def test_geodesic_and_belongs(self):
# TODO(nina): Fix this tests, as it fails when geodesic goes "too far"
initial_point = gs.array([4.0, 1., 3.0, math.sqrt(5)])
n_geodesic_points = 100
vector = gs.array([1., 0., 0., 0.])
initial_tangent_vec = self.space.projection_to_tangent_space(
vector=vector, base_point=initial_point)
geodesic = self.metric.geodesic(
initial_point=initial_point,
initial_tangent_vec=initial_tangent_vec)
t = gs.linspace(start=0., stop=1., num=n_geodesic_points)
points = geodesic(t)
result = self.space.belongs(points)
expected = gs.array(n_geodesic_points * [[True]])
with self.session():
self.assertAllClose(expected, result)
def test_exp_and_log_and_projection_to_tangent_space_edge_case(self):
"""
Test that the riemannian exponential
and the riemannian logarithm are inverse.
Expect their composition to give the identity function.
"""
# Riemannian Exp then Riemannian Log
# Edge case: tangent vector has norm < epsilon
base_point = gs.array([2., 1., 1., 1.])
vector = 1e-10 * gs.array([.06, -51., 6., 5.])
exp = self.metric.exp(tangent_vec=vector, base_point=base_point)
result = self.metric.log(point=exp, base_point=base_point)
expected = self.space.projection_to_tangent_space(
vector=vector, base_point=base_point)
self.assertAllClose(result, expected, atol=1e-8)
@geomstats.tests.np_and_tf_only
def test_variance(self):
point = gs.array([2., 1., 1., 1.])
points = gs.array([point, point])
result = self.metric.variance(points)
expected = helper.to_scalar(0.)
self.assertAllClose(result, expected)
@geomstats.tests.np_and_tf_only
def test_mean(self):
point = gs.array([2., 1., 1., 1.])
points = gs.array([point, point])
result = self.metric.mean(points)
expected = helper.to_vector(point)
self.assertAllClose(result, expected)
@geomstats.tests.np_and_tf_only
def test_mean_and_belongs(self):
point_a = self.space.random_uniform()
point_b = self.space.random_uniform()
point_c = self.space.random_uniform()
points = gs.concatenate([point_a, point_b, point_c], axis=0)
mean = self.metric.mean(points)
result = self.space.belongs(mean)
expected = gs.array([[True]])
self.assertAllClose(result, expected)
class TestHyperbolicSpaceMethods(geomstats.tests.TestCase):
def setUp(self):
gs.random.seed(1234)
self.dimension = 2
self.extrinsic_manifold = HyperbolicSpace(dimension=self.dimension)
self.ball_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='ball')
self.intrinsic_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='intrinsic')
self.half_plane_manifold = HyperbolicSpace(dimension=self.dimension,
point_type='half-plane')
self.ball_metric = HyperbolicMetric(dimension=self.dimension,
point_type='ball')
self.extrinsic_metric = HyperbolicMetric(dimension=self.dimension,
point_type='extrinsic')
self.n_samples = 10
def test_extrinsic_ball_extrinsic(self):
x_in = gs.array([[0.5, 7]])
x = self.intrinsic_manifold.to_coordinates(x_in,
to_point_type='extrinsic')
x_b = self.extrinsic_manifold.to_coordinates(x, to_point_type='ball')
x2 = self.ball_manifold.to_coordinates(x_b, to_point_type='extrinsic')
self.assertAllClose(x, x2, atol=1e-8)
def test_extrinsic_half_plane_extrinsic(self):
x_in = gs.array([[0.5, 7]])
x = self.intrinsic_manifold.to_coordinates(x_in,
to_point_type='extrinsic')
x_up = self.extrinsic_manifold.to_coordinates(
x, to_point_type='half-plane')
x2 = self.half_plane_manifold.to_coordinates(x_up,
to_point_type='extrinsic')
self.assertAllClose(x, x2, atol=1e-8)
def test_intrinsic_extrinsic_intrinsic(self):
x_intr = gs.array([[0.5, 7]])
x_extr = self.intrinsic_manifold.to_coordinates(
x_intr, to_point_type='extrinsic')
x_intr2 = self.extrinsic_manifold.to_coordinates(
x_extr, to_point_type='intrinsic')
self.assertAllClose(x_intr, x_intr2, atol=1e-8)
def test_ball_extrinsic_ball(self):
x = gs.array([[0.5, 0.2]])
x_e = self.ball_manifold.to_coordinates(x, to_point_type='extrinsic')
x2 = self.extrinsic_manifold.to_coordinates(x_e, to_point_type='ball')
self.assertAllClose(x, x2, atol=1e-10)
def test_belongs_ball(self):
x = gs.array([[0.5, 0.2]])
belong = self.ball_manifold.belongs(x)
assert (belong[0])
def test_distance_ball_extrinsic_from_ball(self):
x_ball = gs.array([[0.7, 0.2]])
y_ball = gs.array([[0.2, 0.2]])
x_extr = self.ball_manifold.to_coordinates(x_ball,
to_point_type='extrinsic')
y_extr = self.ball_manifold.to_coordinates(y_ball,
to_point_type='extrinsic')
dst_ball = self.ball_metric.dist(x_ball, y_ball)
dst_extr = self.extrinsic_metric.dist(x_extr, y_extr)
self.assertAllClose(dst_ball, dst_extr)
def test_distance_ball_extrinsic_from_extr(self):
x_int = gs.array([[10, 0.2]])
y_int = gs.array([[1, 6.]])
x_extr = self.intrinsic_manifold.to_coordinates(
x_int, to_point_type='extrinsic')
y_extr = self.intrinsic_manifold.to_coordinates(
y_int, to_point_type='extrinsic')
x_ball = self.extrinsic_manifold.to_coordinates(x_extr,
to_point_type='ball')
y_ball = self.extrinsic_manifold.to_coordinates(y_extr,
to_point_type='ball')
dst_ball = self.ball_metric.dist(x_ball, y_ball)
dst_extr = self.extrinsic_metric.dist(x_extr, y_extr)
self.assertAllClose(dst_ball, dst_extr)
def test_distance_ball_extrinsic_from_extr_5_dim(self):
x_int = gs.array([[10, 0.2, 3, 4]])
y_int = gs.array([[1, 6, 2., 1]])
extrinsic_manifold = HyperbolicSpace(4, point_type='extrinsic')
ball_metric = HyperbolicMetric(4, point_type='ball')
extrinsic_metric = HyperbolicMetric(4, point_type='extrinsic')
x_extr = extrinsic_manifold.from_coordinates(
x_int, from_point_type='intrinsic')
y_extr = extrinsic_manifold.from_coordinates(
y_int, from_point_type='intrinsic')
x_ball = extrinsic_manifold.to_coordinates(x_extr,
to_point_type='ball')
y_ball = extrinsic_manifold.to_coordinates(y_extr,
to_point_type='ball')
dst_ball = ball_metric.dist(x_ball, y_ball)
dst_extr = extrinsic_metric.dist(x_extr, y_extr)
self.assertAllClose(dst_ball, dst_extr)
def test_log_exp_ball_extrinsic_from_extr(self):
x_int = gs.array([[4., 0.2]])
y_int = gs.array([[3., 3]])
x_extr = self.intrinsic_manifold.to_coordinates(
x_int, to_point_type='extrinsic')
y_extr = self.intrinsic_manifold.to_coordinates(
y_int, to_point_type='extrinsic')
x_ball = self.extrinsic_manifold.to_coordinates(x_extr,
to_point_type='ball')
y_ball = self.extrinsic_manifold.to_coordinates(y_extr,
to_point_type='ball')
x_ball_log_exp = self.ball_metric.exp(
self.ball_metric.log(y_ball, x_ball), x_ball)
x_extr_a = self.extrinsic_metric.exp(
self.extrinsic_metric.log(y_extr, x_extr), x_extr)
x_extr_b = self.extrinsic_manifold.from_coordinates(
x_ball_log_exp, from_point_type='ball')
self.assertAllClose(x_extr_a, x_extr_b, atol=1e-4)
def test_log_exp_ball(self):
x = gs.array([[0.1, 0.2]])
y = gs.array([[0.2, 0.5]])
log = self.ball_metric.log(y, x)
exp = self.ball_metric.exp(log, x)
self.assertAllClose(exp, y)
def test_log_exp_ball_batch(self):
x = gs.array([[0.1, 0.2]])
y = gs.array([[0.2, 0.5], [0.1, 0.7]])
log = self.ball_metric.log(y, x)
exp = self.ball_metric.exp(log, x)
self.assertAllClose(exp, y)
def setUp(self):
gs.random.seed(1234)
self.dimension = 3
self.space = HyperbolicSpace(dimension=self.dimension)
self.metric = self.space.metric
self.n_samples = 10