1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
import os.path as osp
import torch
import torch_geometric.transforms as T
from torch_geometric.datasets import TUDataset
from torch_geometric.utils import degree
class NormalizedDegree:
def __init__(self, mean, std):
self.mean = mean
self.std = std
def __call__(self, data):
deg = degree(data.edge_index[0], dtype=torch.float)
deg = (deg - self.mean) / self.std
data.x = deg.view(-1, 1)
return data
def get_dataset(name, sparse=True, cleaned=False):
path = osp.join(osp.dirname(osp.realpath(__file__)), '..', 'data', name)
dataset = TUDataset(path, name, cleaned=cleaned)
dataset.data.edge_attr = None
if dataset.data.x is None:
max_degree = 0
degs = []
for data in dataset:
degs += [degree(data.edge_index[0], dtype=torch.long)]
max_degree = max(max_degree, degs[-1].max().item())
if max_degree < 1000:
dataset.transform = T.OneHotDegree(max_degree)
else:
deg = torch.cat(degs, dim=0).to(torch.float)
mean, std = deg.mean().item(), deg.std().item()
dataset.transform = NormalizedDegree(mean, std)
if not sparse:
num_nodes = max_num_nodes = 0
for data in dataset:
num_nodes += data.num_nodes
max_num_nodes = max(data.num_nodes, max_num_nodes)
# Filter out a few really large graphs in order to apply DiffPool.
if name == 'REDDIT-BINARY':
num_nodes = min(int(num_nodes / len(dataset) * 1.5), max_num_nodes)
else:
num_nodes = min(int(num_nodes / len(dataset) * 5), max_num_nodes)
indices = []
for i, data in enumerate(dataset):
if data.num_nodes <= num_nodes:
indices.append(i)
dataset = dataset.copy(torch.tensor(indices))
if dataset.transform is None:
dataset.transform = T.ToDense(num_nodes)
else:
dataset.transform = T.Compose(
[dataset.transform, T.ToDense(num_nodes)])
return dataset
|
