def test_nx_conversion():
# check conversion between networkx and DGLGraph
def _check_nx_feature(nxg, nf, ef):
# check node and edge feature of nxg
# this is used to check to_networkx
num_nodes = len(nxg)
num_edges = nxg.size()
if num_nodes > 0:
node_feat = ddict(list)
for nid, attr in nxg.nodes(data=True):
assert len(attr) == len(nf)
for k in nxg.nodes[nid]:
node_feat[k].append(attr[k].unsqueeze(0))
for k in node_feat:
feat = th.cat(node_feat[k], dim=0)
assert U.allclose(feat, nf[k])
else:
assert len(nf) == 0
if num_edges > 0:
edge_feat = ddict(lambda: [0] * num_edges)
for u, v, attr in nxg.edges(data=True):
assert len(attr) == len(ef) + 1 # extra id
eid = attr['id']
for k in ef:
edge_feat[k][eid] = attr[k].unsqueeze(0)
for k in edge_feat:
feat = th.cat(edge_feat[k], dim=0)
assert U.allclose(feat, ef[k])
else:
assert len(ef) == 0
n1 = th.randn(5, 3)
n2 = th.randn(5, 10)
n3 = th.randn(5, 4)
e1 = th.randn(4, 5)
e2 = th.randn(4, 7)
g = DGLGraph(multigraph=True)
g.add_nodes(5)
g.add_edges([0, 1, 3, 4], [2, 4, 0, 3])
g.ndata.update({'n1': n1, 'n2': n2, 'n3': n3})
g.edata.update({'e1': e1, 'e2': e2})
# convert to networkx
nxg = g.to_networkx(node_attrs=['n1', 'n3'], edge_attrs=['e1', 'e2'])
assert len(nxg) == 5
assert nxg.size() == 4
_check_nx_feature(nxg, {'n1': n1, 'n3': n3}, {'e1': e1, 'e2': e2})
# convert to DGLGraph, nx graph has id in edge feature
# use id feature to test non-tensor copy
g.from_networkx(nxg, node_attrs=['n1'], edge_attrs=['e1', 'id'])
# check graph size
assert g.number_of_nodes() == 5
assert g.number_of_edges() == 4
# check number of features
# test with existing dglgraph (so existing features should be cleared)
assert len(g.ndata) == 1
assert len(g.edata) == 2
# check feature values
assert U.allclose(g.ndata['n1'], n1)
# with id in nx edge feature, e1 should follow original order
assert U.allclose(g.edata['e1'], e1)
assert th.equal(g.get_e_repr()['id'], th.arange(4))
# test conversion after modifying DGLGraph
g.pop_e_repr(
'id') # pop id so we don't need to provide id when adding edges
new_n = th.randn(2, 3)
new_e = th.randn(3, 5)
g.add_nodes(2, data={'n1': new_n})
# add three edges, one is a multi-edge
g.add_edges([3, 6, 0], [4, 5, 2], data={'e1': new_e})
n1 = th.cat((n1, new_n), dim=0)
e1 = th.cat((e1, new_e), dim=0)
# convert to networkx again
nxg = g.to_networkx(node_attrs=['n1'], edge_attrs=['e1'])
assert len(nxg) == 7
assert nxg.size() == 7
_check_nx_feature(nxg, {'n1': n1}, {'e1': e1})
# now test convert from networkx without id in edge feature
# first pop id in edge feature
for _, _, attr in nxg.edges(data=True):
attr.pop('id')
# test with a new graph
g = DGLGraph(multigraph=True)
g.from_networkx(nxg, node_attrs=['n1'], edge_attrs=['e1'])
# check graph size
assert g.number_of_nodes() == 7
assert g.number_of_edges() == 7
# check number of features
assert len(g.ndata) == 1
assert len(g.edata) == 1
# check feature values
assert U.allclose(g.ndata['n1'], n1)
# edge feature order follows nxg.edges()
edge_feat = []
for _, _, attr in nxg.edges(data=True):
edge_feat.append(attr['e1'].unsqueeze(0))
edge_feat = th.cat(edge_feat, dim=0)
assert U.allclose(g.edata['e1'], edge_feat)
def _load(self):
""" Loads input dataset from dataset/NAME/NAME.txt file
"""
print('loading data...')
with open(self.file, 'r') as f:
# line_1 == N, total number of graphs
self.N = int(f.readline().strip())
for i in range(self.N):
if (i + 1) % 10 == 0 and self.verbosity is True:
print('processing graph {}...'.format(i + 1))
grow = f.readline().strip().split()
# line_2 == [n_nodes, l] is equal to
# [node number of a graph, class label of a graph]
n_nodes, glabel = [int(w) for w in grow]
# relabel graphs
if glabel not in self.glabel_dict:
mapped = len(self.glabel_dict)
self.glabel_dict[glabel] = mapped
self.labels.append(self.glabel_dict[glabel])
g = DGLGraph()
g.add_nodes(n_nodes)
nlabels = [] # node labels
nattrs = [] # node attributes if it has
m_edges = 0
for j in range(n_nodes):
nrow = f.readline().strip().split()
# handle edges and attributes(if has)
tmp = int(nrow[1]) + 2 # tmp == 2 + #edges
if tmp == len(nrow):
# no node attributes
nrow = [int(w) for w in nrow]
nattr = None
elif tmp > len(nrow):
nrow = [int(w) for w in nrow[:tmp]]
nattr = [float(w) for w in nrow[tmp:]]
nattrs.append(nattr)
else:
raise Exception('edge number is incorrect!')
# relabel nodes if it has labels
# if it doesn't have node labels, then every nrow[0]==0
if not nrow[0] in self.nlabel_dict:
mapped = len(self.nlabel_dict)
self.nlabel_dict[nrow[0]] = mapped
#nlabels.append(self.nlabel_dict[nrow[0]])
nlabels.append(nrow[0])
m_edges += nrow[1]
g.add_edges(j, nrow[2:])
# add self loop
if self.self_loop:
m_edges += 1
g.add_edge(j, j)
if (j + 1) % 10 == 0 and self.verbosity is True:
print(
'processing node {} of graph {}...'.format(
j + 1, i + 1))
print('this node has {} edgs.'.format(
nrow[1]))
if nattrs != []:
nattrs = np.stack(nattrs)
g.ndata['attr'] = nattrs
self.nattrs_flag = True
else:
nattrs = None
g.ndata['label'] = np.array(nlabels)
if len(self.nlabel_dict) > 1:
self.nlabels_flag = True
assert len(g) == n_nodes
# update statistics of graphs
self.n += n_nodes
self.m += m_edges
self.graphs.append(g)
# if no attr
if not self.nattrs_flag:
print('there are no node features in this dataset!')
label2idx = {}
# generate node attr by node degree
if self.degree_as_nlabel:
print('generate node features by node degree...')
nlabel_set = set([])
for g in self.graphs:
# actually this label shouldn't be updated
# in case users want to keep it
# but usually no features means no labels, fine.
g.ndata['label'] = g.in_degrees()
# extracting unique node labels
nlabel_set = nlabel_set.union(set(g.ndata['label'].numpy()))
nlabel_set = list(nlabel_set)
# in case the labels/degrees are not continuous number
self.ndegree_dict = {
nlabel_set[i]: i
for i in range(len(nlabel_set))
}
label2idx = self.ndegree_dict
# generate node attr by node label
else:
print('generate node features by node label...')
label2idx = self.nlabel_dict
for g in self.graphs:
g.ndata['attr'] = np.zeros((
g.number_of_nodes(), len(label2idx)))
g.ndata['attr'][range(g.number_of_nodes(
)), [label2idx[nl.item()] for nl in g.ndata['label']]] = 1
# after load, get the #classes and #dim
self.gclasses = len(self.glabel_dict)
self.nclasses = len(self.nlabel_dict)
self.eclasses = len(self.elabel_dict)
self.dim_nfeats = len(self.graphs[0].ndata['attr'][0])
print('Done.')
print(
"""
-------- Data Statistics --------'
#Graphs: %d
#Graph Classes: %d
#Nodes: %d
#Node Classes: %d
#Node Features Dim: %d
#Edges: %d
#Edge Classes: %d
Avg. of #Nodes: %.2f
Avg. of #Edges: %.2f
Graph Relabeled: %s
Node Relabeled: %s
Degree Relabeled(If degree_as_nlabel=True): %s \n """ % (
self.N, self.gclasses, self.n, self.nclasses,
self.dim_nfeats, self.m, self.eclasses,
self.n / self.N, self.m / self.N, self.glabel_dict,
self.nlabel_dict, self.ndegree_dict))
def test_nx_conversion():
# check conversion between networkx and DGLGraph
def _check_nx_feature(nxg, nf, ef):
num_nodes = len(nxg)
num_edges = nxg.size()
if num_nodes > 0:
node_feat = ddict(list)
for nid, attr in nxg.nodes(data=True):
assert len(attr) == len(nf)
for k in nxg.nodes[nid]:
node_feat[k].append(attr[k].unsqueeze(0))
for k in node_feat:
feat = th.cat(node_feat[k], dim=0)
assert U.allclose(feat, nf[k])
else:
assert len(nf) == 0
if num_edges > 0:
edge_feat = ddict(lambda: [0] * num_edges)
for u, v, attr in nxg.edges(data=True):
assert len(attr) == len(ef) + 1 # extra id
eid = attr['id']
for k in ef:
edge_feat[k][eid] = attr[k].unsqueeze(0)
for k in edge_feat:
feat = th.cat(edge_feat[k], dim=0)
assert U.allclose(feat, ef[k])
else:
assert len(ef) == 0
n1 = th.randn(5, 3)
n2 = th.randn(5, 10)
n3 = th.randn(5, 4)
e1 = th.randn(4, 5)
e2 = th.randn(4, 7)
g = DGLGraph(multigraph=True)
g.add_nodes(5)
g.add_edges([0, 1, 3, 4], [2, 4, 0, 3])
g.ndata.update({'n1': n1, 'n2': n2, 'n3': n3})
g.edata.update({'e1': e1, 'e2': e2})
# convert to networkx
nxg = g.to_networkx(node_attrs=['n1', 'n3'], edge_attrs=['e1', 'e2'])
assert len(nxg) == 5
assert nxg.size() == 4
_check_nx_feature(nxg, {'n1': n1, 'n3': n3}, {'e1': e1, 'e2': e2})
# convert to DGLGraph
# use id feature to test non-tensor copy
g.from_networkx(nxg, node_attrs=['n1'], edge_attrs=['e1', 'id'])
assert g.number_of_nodes() == 5
assert g.number_of_edges() == 4
assert U.allclose(g.get_n_repr()['n1'], n1)
assert U.allclose(g.get_e_repr()['e1'], e1)
assert th.equal(g.get_e_repr()['id'], th.arange(4))
g.pop_e_repr('id')
# test modifying DGLGraph
new_n = th.randn(2, 3)
new_e = th.randn(3, 5)
g.add_nodes(2, data={'n1': new_n})
# add three edges, one is a multi-edge
g.add_edges([3, 6, 0], [4, 5, 2], data={'e1': new_e})
n1 = th.cat((n1, new_n), dim=0)
e1 = th.cat((e1, new_e), dim=0)
# convert to networkx again
nxg = g.to_networkx(node_attrs=['n1'], edge_attrs=['e1'])
assert len(nxg) == 7
assert nxg.size() == 7
_check_nx_feature(nxg, {'n1': n1}, {'e1': e1})
