/
utils.py
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/
utils.py
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import numpy as np
import scipy.sparse as sp
import torch
import sys
import pickle as pkl
import networkx as nx
from normalization import fetch_normalization, row_normalize
from time import perf_counter
def parse_index_file(filename):
"""Parse index file."""
index = []
for line in open(filename):
index.append(int(line.strip()))
return index
def preprocess_citation(adj, features, normalization="FirstOrderGCN"):
adj_normalizer = fetch_normalization(normalization)
adj = adj_normalizer(adj)
features = row_normalize(features)
return adj, features
def sparse_mx_to_torch_sparse_tensor(sparse_mx):
"""Convert a scipy sparse matrix to a torch sparse tensor."""
sparse_mx = sparse_mx.tocoo().astype(np.float32)
indices = torch.from_numpy(
np.vstack((sparse_mx.row, sparse_mx.col)).astype(np.int64))
values = torch.from_numpy(sparse_mx.data)
shape = torch.Size(sparse_mx.shape)
return torch.sparse.FloatTensor(indices, values, shape)
def load_citation(dataset_str="cora", normalization="AugNormAdj", cuda=True):
"""
Load Citation Networks Datasets.
"""
names = ['x', 'y', 'tx', 'ty', 'allx', 'ally', 'graph']
objects = []
for i in range(len(names)):
with open("data/ind.{}.{}".format(dataset_str.lower(), names[i]), 'rb') as f:
if sys.version_info > (3, 0):
objects.append(pkl.load(f, encoding='latin1'))
else:
objects.append(pkl.load(f))
x, y, tx, ty, allx, ally, graph = tuple(objects)
test_idx_reorder = parse_index_file("data/ind.{}.test.index".format(dataset_str))
test_idx_range = np.sort(test_idx_reorder)
if dataset_str == 'citeseer':
# Fix citeseer dataset (there are some isolated nodes in the graph)
# Find isolated nodes, add them as zero-vecs into the right position
test_idx_range_full = range(min(test_idx_reorder), max(test_idx_reorder)+1)
tx_extended = sp.lil_matrix((len(test_idx_range_full), x.shape[1]))
tx_extended[test_idx_range-min(test_idx_range), :] = tx
tx = tx_extended
ty_extended = np.zeros((len(test_idx_range_full), y.shape[1]))
ty_extended[test_idx_range-min(test_idx_range), :] = ty
ty = ty_extended
features = sp.vstack((allx, tx)).tolil()
features[test_idx_reorder, :] = features[test_idx_range, :]
adj = nx.adjacency_matrix(nx.from_dict_of_lists(graph))
adj = adj + adj.T.multiply(adj.T > adj) - adj.multiply(adj.T > adj)
labels = np.vstack((ally, ty))
labels[test_idx_reorder, :] = labels[test_idx_range, :]
idx_test = test_idx_range.tolist()
idx_train = range(len(y))
idx_val = range(len(y), len(y)+500)
adj, features = preprocess_citation(adj, features, normalization)
# porting to pytorch
features = torch.FloatTensor(np.array(features.todense())).float()
labels = torch.LongTensor(labels)
labels = torch.max(labels, dim=1)[1]
adj = sparse_mx_to_torch_sparse_tensor(adj).float()
idx_train = torch.LongTensor(idx_train)
idx_val = torch.LongTensor(idx_val)
idx_test = torch.LongTensor(idx_test)
if cuda:
features = features.cuda()
adj = adj.cuda()
labels = labels.cuda()
idx_train = idx_train.cuda()
idx_val = idx_val.cuda()
idx_test = idx_test.cuda()
return adj, features, labels, idx_train, idx_val, idx_test
def sgc_precompute(features, adj, degree):
t = perf_counter()
for i in range(degree):
features = torch.spmm(adj, features)
precompute_time = perf_counter()-t
return features, precompute_time
def set_seed(seed, cuda):
np.random.seed(seed)
torch.manual_seed(seed)
if cuda: torch.cuda.manual_seed(seed)
def loadRedditFromNPZ(dataset_dir):
adj = sp.load_npz(dataset_dir+"reddit_adj.npz")
data = np.load(dataset_dir+"reddit.npz")
return adj, data['feats'], data['y_train'], data['y_val'], data['y_test'], data['train_index'], data['val_index'], data['test_index']
def load_reddit_data(data_path="data/", normalization="AugNormAdj", cuda=True):
adj, features, y_train, y_val, y_test, train_index, val_index, test_index = loadRedditFromNPZ("data/")
labels = np.zeros(adj.shape[0])
labels[train_index] = y_train
labels[val_index] = y_val
labels[test_index] = y_test
adj = adj + adj.T
train_adj = adj[train_index, :][:, train_index]
features = torch.FloatTensor(np.array(features))
features = (features-features.mean(dim=0))/features.std(dim=0)
adj_normalizer = fetch_normalization(normalization)
adj = adj_normalizer(adj)
adj = sparse_mx_to_torch_sparse_tensor(adj).float()
train_adj = adj_normalizer(train_adj)
train_adj = sparse_mx_to_torch_sparse_tensor(train_adj).float()
labels = torch.LongTensor(labels)
if cuda:
adj = adj.cuda()
train_adj = train_adj.cuda()
features = features.cuda()
labels = labels.cuda()
return adj, train_adj, features, labels, train_index, val_index, test_index