def test_ShiftSkeleton(self):
Sk = Skeleton()
nodes = np.array([[0, 0, 0], [5, 5, 10], [10, 10, 10]])
edges = ((0, 1),(1, 2))
Sk.initialize_from_datapoints(datapoints=nodes, vp_type_voxel=True, edgelist=edges,
datapoints_type='nparray')
offset_1 = np.asarray([1,1,1])
new_pos0 = nodes[0] + offset_1
Sk.shift_skeleton(offset=offset_1, VP_type='voxel')
pos0 = Sk.nx_graph.node[0]['position'].voxel
self.assertTrue(np.array_equal(new_pos0, pos0))
self.assertEqual(None, Sk.nx_graph.node[0]['position'].phys)
Sk = Skeleton()
nodes = np.array([[0, 0, 0], [5, 5, 10], [10, 10, 10]])
edges = ((0, 1),(1, 2))
Sk.initialize_from_datapoints(datapoints=nodes, vp_type_voxel=False, edgelist=edges,
datapoints_type='nparray')
offset_2 = np.asarray([1,2,3])
new_pos0 = nodes[0] + offset_2
Sk.shift_skeleton(offset=offset_2, VP_type='phys')
pos0 = Sk.nx_graph.node[0]['position'].phys
self.assertTrue(np.array_equal(new_pos0, pos0))
self.assertEqual(None, Sk.nx_graph.node[0]['position'].voxel)
def test_CropGraphToBb(self):
bb_min = [1,1,1]
bb_max = [7,7,7]
Sk = Skeleton()
nodes = np.array([[0, 0, 0], [5, 5, 5], [6,6,6], [8,8,8]])
num_nodes_outside = 2
edges = ((0, 1),(1, 2),(2,3))
Sk.initialize_from_datapoints(datapoints=nodes, vp_type_voxel=True, edgelist=edges,
datapoints_type='nparray')
Sk2 = Skeleton()
nodes2 = np.array([[1, 1, 1], [5, 5, 5], [6,6,6]])
edges2 = ((0, 1),(1, 2))
Sk2.initialize_from_datapoints(datapoints=nodes2, vp_type_voxel=True, edgelist=edges2,
datapoints_type='nparray')
# example where 2 nodes outside
Sk.crop_graph_to_bb(bb_min, bb_max)
for node_id in Sk.nx_graph.nodes_iter():
self.assertTrue(Sk.check_point_inside_bb(Sk.nx_graph.node[node_id]['position'].voxel, bb_min, bb_max))
self.assertEqual(Sk.nx_graph.number_of_nodes(), len(nodes)-num_nodes_outside)
# example with no nodes outside
Sk2.crop_graph_to_bb(bb_min, bb_max)
for node_id in Sk2.nx_graph.nodes_iter():
self.assertTrue(Sk2.check_point_inside_bb(Sk2.nx_graph.node[node_id]['position'].voxel, bb_min, bb_max))
self.assertEqual(Sk2.nx_graph.number_of_nodes(), len(nodes2))
def test_getNodeIdsOfEndpoints(self):
# test correct number and node id of edges for branched graph
test_skeleton_end = Skeleton(voxel_size=np.array([1.,1.,2.]))
nodes_pos_phys_end = np.array([[0, 0, 0], [10., 5., 5.], [20., 10., 10.], [30., 15., 15.],[20.,20.,20.],[25., 25., 25.],[30., 30., 30.]])
edges_end = [(0, 1), (1, 2), (2, 3), (1,4), (4, 5), (1, 6)]
test_skeleton_end.initialize_from_datapoints(nodes_pos_phys_end, vp_type_voxel=False, edgelist=edges_end)
all_endpoints = test_skeleton_end.get_node_ids_of_endpoints()
self.assertEqual(len(all_endpoints), 4)
self.assertEqual(set(all_endpoints), set([0,3,5,6]))
# test correct number and node id of edges for cyclic graph
test_skeleton_end = Skeleton(voxel_size=np.array([1.,1.,2.]))
nodes_pos_phys_end = np.array([[0, 0, 0], [5., 5., 5.], [10., 10., 10.], [15., 15., 15.],[20.,20.,20.],[25., 25., 25.],[30., 30., 30.]])
edges_end = [(0, 1), (1, 2), (2, 3), (3,4), (4, 5), (5, 6), (6, 0)]
test_skeleton_end.initialize_from_datapoints(nodes_pos_phys_end, vp_type_voxel=False, edgelist=edges_end)
all_endpoints = test_skeleton_end.get_node_ids_of_endpoints()
self.assertEqual(len(all_endpoints), 0)
self.assertEqual(set(all_endpoints), set([]))
# test that does return an empty list, if only one single node is given in the connected graph
test_skeleton_end = Skeleton(voxel_size=np.array([1.,1.,2.]))
nodes_pos_phys_end = np.array([[5., 5., 5.]])
test_skeleton_end.initialize_from_datapoints(nodes_pos_phys_end, vp_type_voxel=False, edgelist=None)
all_endpoints = test_skeleton_end.get_node_ids_of_endpoints()
self.assertEqual(len(all_endpoints), 0)
def test_writeToKnossos(self):
# Represents a branching skeleton. Not a real testfunction.
# TODO add actual test function, when also reading knossos files is possible.
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
nodes_pos_phys = np.array([[0, 0, 0], [50., 50., 100.], [100., 100., 200.], [100., 100., 300.]])
edges = [(0, 1), (1, 2), (1, 3)]
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
test_skeleton2 = Skeleton(voxel_size=[10., 10., 20.])
nodes_pos_phys = np.array([[50., 50., 100.], [50., 50., 200.], [50., 50., 300.]])
edges = [(0, 1), (1, 2)]
test_skeleton2.initialize_from_datapoints(nodes_pos_phys, False, edgelist=edges)
skeleton_container = SkeletonContainer([test_skeleton, test_skeleton2])
skeleton_container.write_to_knossos_nml('testdata/knossostestfile.nml')
def test_GetSegIDs(self):
segmentation = np.zeros((20, 20, 20))
segmentation[:, :, 0:7] = 1
segmentation[:, :, 7:10] = 2
segmentation[:, :, 10:16] = 3
segmentation[:, :, 16:20] = 4
Sk = Skeleton()
nodes = np.array([[10, 10, 0], [10, 10, 15]])
edges = [[0, 1]]
Sk.initialize_from_datapoints(datapoints=nodes, vp_type_voxel=True, edgelist=edges,
datapoints_type='nparray')
Sk.interpolate_edges()
# Test basics, collect all seg_ids.
seg_ids, object_dict = Sk.get_seg_ids(segmentation, size_thres=0, return_objectdict=True)
expected_segids = np.array([1, 2, 3])
self.assertTrue(set(expected_segids) == set(seg_ids))
self.assertEqual(7, object_dict[1]['size'])
# Test size_thres.
seg_ids, object_dict = Sk.get_seg_ids(segmentation, size_thres=4, return_objectdict=True)
expected_segids = np.array([1, 3])
self.assertTrue(set(expected_segids) == set(seg_ids))
self.assertEqual(3, object_dict[2]['size'])
# Test returning empty array if skeleton coordinates are outside the cube.
Sk.shift_skeleton([20, 20, 20], 'voxel')
seg_ids, object_dict = Sk.get_seg_ids(segmentation, size_thres=0, return_objectdict=True)
self.assertEqual(0, len(list(seg_ids)))
self.assertEqual(0, len(object_dict))
def test_addedge(self):
my_skeleton = Skeleton()
edges = [(0, 1), (1, 2), (2, 3)]
for edge in edges:
my_skeleton.add_edge(u=edge[0], v=edge[1])
self.assertEqual(my_skeleton.nx_graph.number_of_nodes(), len(edges) + 1)
self.assertEqual(my_skeleton.nx_graph.number_of_edges(), len(edges))
def test_applyTransformation(self):
try:
import augment
except ImportError:
return
# normal case and if exactly at the same position
test_skeleton = Skeleton()
nodes_target = np.array([[0, 0, 0], [1, 0, 1], [2, 1, 2]])
edges_target = ((0, 1),(1, 2))
test_skeleton.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
nodes_bb = (3, 3, 3)
# Create transformation matrix.
transformation = augment.create_identity_transformation(nodes_bb)
# Rotate around z axis 90 degree anti-clockwise.
transformation += augment.create_rotation_transformation(
nodes_bb,
math.pi/2)
test_skeleton.apply_transformation(transformation)
pred_pos0 = test_skeleton.nx_graph.node[0]['position'].voxel
pred_pos1 = test_skeleton.nx_graph.node[1]['position'].voxel
pred_pos2 = test_skeleton.nx_graph.node[2]['position'].voxel
exp_pos0 = np.array([2, 0, 0])
exp_pos1 = np.array([2, 1, 1])
exp_pos2 = np.array([1, 2, 2])
self.assertTrue((pred_pos0 == exp_pos0).all())
self.assertTrue((pred_pos1 == exp_pos1).all())
self.assertTrue((pred_pos2 == exp_pos2).all())
def test_basicinitialization(self):
my_identifier = 3
my_voxel_size = np.array([1., 1., 2.])
my_seg_id = 2
my_nx_graph = nx.Graph()
my_skeleton = Skeleton(identifier=my_identifier, voxel_size=my_voxel_size, seg_id=my_seg_id)
my_skeleton_with_graph = Skeleton(identifier=my_identifier, voxel_size=my_voxel_size, seg_id=my_seg_id,
nx_graph=my_nx_graph)
self.assertEqual(my_skeleton.nx_graph.number_of_nodes(), 0)
self.assertEqual(my_skeleton.nx_graph.number_of_edges(), 0)
self.assertEqual(my_skeleton.identifier, my_identifier)
self.assertTrue(np.array_equal(my_skeleton.voxel_size, my_voxel_size))
self.assertEqual(my_skeleton.seg_id, my_seg_id)
self.assertIsInstance(my_skeleton.nx_graph, nx.Graph)
self.assertIsInstance(my_skeleton_with_graph.nx_graph, nx.Graph)
def test_addnode(self):
my_skeleton = Skeleton()
scaling = np.array([1., 1., 0.5])
nodes_pos_phys = np.array([[0, 0, 0], [50, 50, 50], [100, 100, 100], [150, 150, 150]])
nodes_pos_voxel = np.floor(nodes_pos_phys * scaling)
node_ids = range(nodes_pos_voxel.shape[0])
for node_id, pos_voxel, pos_phys in zip(node_ids, nodes_pos_voxel, nodes_pos_phys):
my_skeleton.add_node(node_id, pos_voxel=pos_voxel, pos_phys=pos_phys)
def test_totalPathLength(self):
test_skeleton = Skeleton()
nodes_pos_phys = np.array([[0, 0, 0], [5., 5., 5.], [10., 10., 10.], [15., 15., 15.]])
edges = [(0, 1), (1, 2), (2, 3)]
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
exp_total_length = np.sqrt((15 ** 2) * 3)
total_length = test_skeleton.calculate_total_phys_length()
self.assertEqual(exp_total_length, total_length)
def test_evaluate_segmentation_with_gt_skeletons(self):
segmentation = np.zeros((20, 20, 20))
segmentation[:, :, 0:7] = 1
segmentation[:, :, 7:10] = 2
segmentation[:, :, 10:16] = 3
segmentation[:, :, 16:20] = 4
segmentation[:, 0:5, :16] = 5
sk_left = Skeleton()
nodes = np.array([[10, 3, 0], [
10, 3, 20
]]) # skeleton that passes y-left part of the cube (ID 5 and 4)
edges = [[0, 1]]
sk_left.initialize_from_datapoints(datapoints=nodes,
vp_type_voxel=True,
edgelist=edges,
datapoints_type='nparray')
sk_left.interpolate_edges()
sk_right = Skeleton()
nodes = np.array([[10, 7, 0], [
10, 7, 20
]]) # skeleton that passes y-right part of the cube (ID 1 2 3 4 5)
edges = [[0, 1]]
sk_right.initialize_from_datapoints(datapoints=nodes,
vp_type_voxel=True,
edgelist=edges,
datapoints_type='nparray')
sk_right.interpolate_edges()
sk_con = SkeletonContainer(skeletons=[sk_left, sk_right])
num_merges, num_splits, SV_merges, bigraph, new_seg = evaluate_segmentation_with_gt_skeletons(
segmentation, sk_con, return_new_seg=True, size_thres=0)
expected_SV_merger = [5]
self.assertEqual(1, num_merges)
self.assertEqual(4, num_splits)
self.assertTrue(set(expected_SV_merger), SV_merges)
# Since the two skeletons have a common supervoxel, the resulting new segmentation should have exactly
# one connected component.
self.assertEqual(1, len(np.unique(new_seg)))
def test_getDistanceToSkeleton(self):
# normal case and if exactly at the same position
Sk_target = Skeleton()
nodes_target = np.array([[0, 0, 0], [5, 5, 10], [10, 10, 10]])
edges_target = ((0, 1),(1, 2))
Sk_target.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
nodes_pred = np.array([[0, 0, 0], [5, 5, 15]])
true_distances = np.array([0., 5.])
distance_to_cl = Sk_target.get_distance_to_skeleton(x=nodes_pred)
self.assertTrue(np.array_equal(true_distances, distance_to_cl))
# check if interpolated lines are taken into account
Sk_target = Skeleton()
nodes_target = np.array([[0, 0, 0], [20, 20, 20]])
edges_target = [(0, 1)]
Sk_target.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
nodes_pred = np.array([[0, 0, 0], [5, 5, 5], [10, 10, 10]])
true_distances = np.array([0., 0., 0.])
distance_to_cl = Sk_target.get_distance_to_skeleton(x=nodes_pred)
self.assertTrue(np.array_equal(true_distances, distance_to_cl))
def test_CheckPointInsideBb(self):
Sk = Skeleton()
nodes = np.array([[0, 0, 0], [5, 5, 5], [6,6,6], [8,8,8]])
edges = ((0, 1),(1, 2),(2,3))
Sk.initialize_from_datapoints(datapoints=nodes, vp_type_voxel=True, edgelist=edges,
datapoints_type='nparray')
bb_min = [1,1,1]
bb_max = [6,6,6]
# check points between min und max and exactly min and max are still counted as inside
self.assertTrue(Sk.check_point_inside_bb([1,1,1], bb_min=bb_min, bb_max=bb_max))
self.assertTrue(Sk.check_point_inside_bb([4,4,4], bb_min=bb_min, bb_max=bb_max))
self.assertTrue(Sk.check_point_inside_bb([5,5,5], bb_min=bb_min, bb_max=bb_max))
# check points smaller than min and larger than max are counted as outside
self.assertFalse(Sk.check_point_inside_bb([0,0,0], bb_min=bb_min, bb_max=bb_max))
self.assertFalse(Sk.check_point_inside_bb([7,7,7], bb_min=bb_min, bb_max=bb_max))
def test_getRecall(self):
# normal case
Sk_target = Skeleton()
nodes_target = np.array([[0, 0, 0], [5, 5, 10], [5, 5, 15], [20, 20, 20]])
edges_target = ((0, 1), (1, 2), (2, 3))
Sk_target.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
Sk_pred = Skeleton()
nodes_pred = np.array([[0, 0, 5], [5, 5, 15], [10, 15, 25], [20, 25, 40]])
edges_pred = ((0, 1), (1, 2), (2, 3))
Sk_pred.initialize_from_datapoints(datapoints=nodes_pred, vp_type_voxel=True, edgelist=edges_pred,
datapoints_type='nparray')
tolerance_distance = 5
human_recall = (1.+1.+1.+0.) / len(nodes_pred)
fct_recall = Sk_target.get_recall(other=Sk_pred, tolerance_distance=tolerance_distance)
self.assertEqual(human_recall, fct_recall)
# test if tolerance distance is 0, only exactly the same node position are correct
Sk_target = Skeleton()
nodes_target = np.array([[0, 0, 0], [5, 5, 5], [10, 10, 10], [20, 20, 20]])
edges_target = ((0, 1), (1, 2), (2, 3))
Sk_target.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
Sk_pred = Skeleton()
nodes_pred = np.array([[0, 0, 0], [5, 5, 6], [5, 5, 7], [10, 10, 10], [20, 20, 18]])
edges_pred = ((0, 1), (1, 2), (2, 3), (3, 4))
Sk_pred.initialize_from_datapoints(datapoints=nodes_pred, vp_type_voxel=True, edgelist=edges_pred,
datapoints_type='nparray')
tolerance_distance = 0
human_precision = (1.+0.+0.+1.+0.) / 5.
fct_precision = Sk_target.get_precision(other=Sk_pred, tolerance_distance=tolerance_distance)
self.assertEqual(human_precision, fct_precision)
# check if interpolated lines are taken into account
Sk_target = Skeleton()
nodes_target = np.array([[0, 0, 0], [20, 20, 20]])
edges_target = [(0, 1)]
Sk_target.initialize_from_datapoints(datapoints=nodes_target, vp_type_voxel=True, edgelist=edges_target,
datapoints_type='nparray')
Sk_pred = Skeleton()
nodes_pred = np.array([[0, 0, 0], [5, 5, 5], [10, 10, 10], [30, 30, 30]])
edges_pred = ((0, 1), (1, 2), (2, 3))
Sk_pred.initialize_from_datapoints(datapoints=nodes_pred, vp_type_voxel=True, edgelist=edges_pred,
datapoints_type='nparray')
tolerance_distance = 0.
human_recall = (1. + 1.+ 1.) / len(nodes_pred)
fct_recall = Sk_target.get_precision(other=Sk_pred, tolerance_distance=tolerance_distance)
self.assertEqual(human_recall, fct_recall)
def test_addedgefeatures(self):
my_skeleton = Skeleton()
scaling = np.array([1., 1., 0.5])
nodes_pos_phys = np.array([[0, 0, 0], [50, 50, 50], [100, 100, 100], [150, 150, 150]])
nodes_pos_voxel = np.floor(nodes_pos_phys * scaling)
node_ids = range(nodes_pos_voxel.shape[0])
for node_id, pos_voxel, pos_phys in zip(node_ids, nodes_pos_voxel, nodes_pos_phys):
my_skeleton.add_node(node_id=node_id, pos_voxel=pos_voxel, pos_phys=pos_phys)
edges = [(0, 1), (1, 2), (2, 3)]
for edge in edges:
my_skeleton.add_edge(u=edge[0], v=edge[1])
my_edge = 2
edge_u = edges[my_edge][0]
edge_v = edges[my_edge][1]
my_skeleton._add_edge_features(u=edge_u, v=edge_v, edge_feature_names=['length'])
length_voxel = np.sqrt(sum((nodes_pos_voxel[edge_u] - nodes_pos_voxel[edge_v]) ** 2))
length_phys = np.sqrt(sum((nodes_pos_phys[edge_u] - nodes_pos_phys[edge_v]) ** 2))
self.assertEqual(my_skeleton.nx_graph.edge[edge_u][edge_v]['length'].voxel, length_voxel)
self.assertEqual(my_skeleton.nx_graph.edge[edge_u][edge_v]['length'].phys, length_phys)
def test_SkContainerSplitIntoCCs(self):
# Represents a branching skeleton.
test_skeleton = Skeleton()
nodes_pos = np.array([[5, 0, 5], [5, 5, 5], [10, 10, 10], [15, 10, 8]])
edges = [(0, 1), (1, 2), (1, 3)]
test_skeleton.initialize_from_datapoints(nodes_pos, vp_type_voxel=True, edgelist=edges)
test_skeleton.interpolate_edges()
skeleton_container = SkeletonContainer([test_skeleton])
for skeleton in skeleton_container.skeleton_list:
for node_id, node_dic in skeleton.nx_graph.nodes_iter(data=True):
print node_id, node_dic['position'].voxel
print skeleton.nx_graph.edges()
for skeleton in skeleton_container.skeleton_list:
skeleton.crop_graph_to_bb([6, 6, 6], [20, 20, 20])
self.assertEqual(1, len(skeleton_container.skeleton_list))
skeleton_container.split_into_cc()
self.assertEqual(2, len(skeleton_container.skeleton_list))
def test_interpolateSkeleton(self):
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
nodes_pos_phys = np.array([[0, 0, 0], [50., 50., 100.], [100., 100., 200.], [100., 100., 300.]])
edges = [(0, 1), (1, 2), (1, 3)]
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
# Get statistics about the graph and check whether they remain the same after interpolating the edges.
# voxel
deg = test_skeleton.nx_graph.degree()
num_of_branch_nodes = len([n for n in deg if deg[n] > 1])
num_of_endnodes = len([n for n in deg if deg[n] == 1])
num_of_nodes_with_no_edge = len([n for n in deg if deg[n] == 0])
test_skeleton.interpolate_edges(step_size=1, VP_type='voxel')
self.assertEqual(num_of_branch_nodes, len([n for n in deg if deg[n] > 1]))
self.assertEqual(num_of_endnodes, len([n for n in deg if deg[n] == 1]))
self.assertEqual(num_of_nodes_with_no_edge, len([n for n in deg if deg[n] == 0]))
# phys
deg = test_skeleton.nx_graph.degree()
num_of_branch_nodes = len([n for n in deg if deg[n] > 1])
num_of_endnodes = len([n for n in deg if deg[n] == 1])
num_of_nodes_with_no_edge = len([n for n in deg if deg[n] == 0])
test_skeleton.interpolate_edges(step_size=1, VP_type='phys')
self.assertEqual(num_of_branch_nodes, len([n for n in deg if deg[n] > 1]))
self.assertEqual(num_of_endnodes, len([n for n in deg if deg[n] == 1]))
self.assertEqual(num_of_nodes_with_no_edge, len([n for n in deg if deg[n] == 0]))
# Test interpolation with voxel step size = 2.
# voxel
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
deg = test_skeleton.nx_graph.degree()
num_of_branch_nodes = len([n for n in deg if deg[n] > 1])
num_of_endnodes = len([n for n in deg if deg[n] == 1])
num_of_nodes_with_no_edge = len([n for n in deg if deg[n] == 0])
exp_nodes = test_skeleton.nx_graph.nodes()
exp_edges = test_skeleton.nx_graph.edges()
test_skeleton.interpolate_edges(step_size=2, VP_type='voxel')
self.assertEqual(num_of_branch_nodes, len([n for n in deg if deg[n] > 1]))
self.assertEqual(num_of_endnodes, len([n for n in deg if deg[n] == 1]))
self.assertEqual(num_of_nodes_with_no_edge, len([n for n in deg if deg[n] == 0]))
self.assertNotEqual(exp_nodes, test_skeleton.nx_graph.nodes())
self.assertNotEqual(exp_edges, test_skeleton.nx_graph.edges())
# phys
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
deg = test_skeleton.nx_graph.degree()
num_of_branch_nodes = len([n for n in deg if deg[n] > 1])
num_of_endnodes = len([n for n in deg if deg[n] == 1])
num_of_nodes_with_no_edge = len([n for n in deg if deg[n] == 0])
exp_nodes = test_skeleton.nx_graph.nodes()
exp_edges = test_skeleton.nx_graph.edges()
test_skeleton.interpolate_edges(step_size=2, VP_type='phys')
self.assertEqual(num_of_branch_nodes, len([n for n in deg if deg[n] > 1]))
self.assertEqual(num_of_endnodes, len([n for n in deg if deg[n] == 1]))
self.assertEqual(num_of_nodes_with_no_edge, len([n for n in deg if deg[n] == 0]))
self.assertNotEqual(exp_nodes, test_skeleton.nx_graph.nodes())
self.assertNotEqual(exp_edges, test_skeleton.nx_graph.edges())
# Test interpolation with voxel step size too big and check that the graph does not change at all.
# voxel
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
exp_nodes = test_skeleton.nx_graph.nodes()
exp_edges = test_skeleton.nx_graph.edges()
test_skeleton.interpolate_edges(step_size=50, VP_type='voxel')
self.assertEqual(exp_nodes, test_skeleton.nx_graph.nodes())
self.assertEqual(exp_edges, test_skeleton.nx_graph.edges())
# phys
test_skeleton = Skeleton(voxel_size=[10., 10., 20.])
test_skeleton.initialize_from_datapoints(nodes_pos_phys, vp_type_voxel=False, edgelist=edges)
exp_nodes = test_skeleton.nx_graph.nodes()
exp_edges = test_skeleton.nx_graph.edges()
test_skeleton.interpolate_edges(step_size=200, VP_type='phys')
self.assertEqual(exp_nodes, test_skeleton.nx_graph.nodes())
self.assertEqual(exp_edges, test_skeleton.nx_graph.edges())