def train(args):
_, A, _ = load_data(path=args.path, dataset=args.dataset)
scaled_A = A / A.sum(axis=1)
size = args.size
K = args.Kstep
assert size % K == 0
dim = int(size / K)
t1 = time.time()
A_k = np.identity(scaled_A.shape[0])
Rep = np.zeros((scaled_A.shape[0], size))
for i in range(K):
print("K:", i)
A_k = np.dot(A_k, scaled_A)
prob_trans = np.log(A_k / np.tile(np.sum(A_k, axis=0),
(scaled_A.shape[0], 1))) - np.log(
1.0 / scaled_A.shape[0])
prob_trans[prob_trans < 0] = 0
prob_trans[prob_trans == np.nan] = 0
U, S, VT = la.svd(prob_trans)
Ud = U[:, 0:dim]
Sd = S[0:dim]
R_k = np.array(Ud) * np.power(Sd, 0.5).reshape(dim)
R_k = normalize(R_k, axis=1, norm='l2')
Rep[:, dim * i:dim * (i + 1)] = R_k[:, :]
print("done.., cost: {}s".format(time.time() - t1))
np.save(args.output + ".npy", np.asarray(Rep, dtype=np.float32))
print("saved.")
def train_py(args):
_, A, _ = load_data(path=args.path, dataset=args.dataset)
scaled_A = A / A.sum(axis=1)
size = args.size
K = args.Kstep
assert size % K == 0
dim = int(size / K)
t1 = time.time()
A_k = np.identity(scaled_A.shape[0])
Rep = np.zeros((scaled_A.shape[0], size))
scaled_A = torch.FloatTensor(scaled_A).cuda()
A_k = torch.FloatTensor(A_k).cuda()
Rep = torch.FloatTensor(Rep).cuda()
for i in range(K):
print("K:", i)
A_k = torch.dot(A_k, scaled_A)
prob_trans = torch.log(A_k / torch.sum(A_k, dim=0).repeat(
scaled_A.shape[0], 1)) - torch.log(1.0 / scaled_A.shape[0])
prob_trans[prob_trans < 0] = 0
prob_trans[prob_trans == np.nan] = 0
U, S, VT = torch.svd(prob_trans)
Ud = U[:, 0:dim]
Sd = S[0:dim]
R_k = Ud * torch.pow(Sd, 0.5).view(dim)
R_k = F.normalize(R_k, p=2, dim=1)
Rep[:, dim * i:dim * (i + 1)] = R_k[:, :]
print("done.., cost: {}s".format(time.time() - t1))
np.save(args.output + ".npy", Rep.cpu().numpy())
print("saved.")
def train(args):
_, A, _ = load_data(path=args.path, dataset=args.dataset)
row, col = A.nonzero()
edges = np.concatenate((row.reshape(-1, 1), col.reshape(-1, 1)),
axis=1).astype(dtype=np.dtype(str))
print("build")
t1 = time.time()
G = {}
for [i, j] in edges:
if i not in G:
G[i] = []
if j not in G:
G[j] = []
G[i].append(j)
G[j].append(i)
for node in G:
G[node] = list(sorted(set(G[node])))
if node in G[node]:
G[node].remove(node)
nodes = list(sorted(G.keys()))
print("len(G.keys()):", len(G.keys()), "\tnode_num:", A.shape[0])
corpus = []
for cnt in range(args.number_walks):
random.shuffle(nodes)
for idx, node in enumerate(nodes):
path = [node]
while len(path) < args.walk_length:
cur = path[-1]
if len(G[cur]) > 0:
if random.random() >= args.alpha:
path.append(random.choice(G[cur]))
else:
path.append(path[0])
else:
break
corpus.append(path)
t2 = time.time()
print("cost: {}s".format(t2 - t1))
print("train...")
model = Word2Vec(corpus,
size=args.size,
window=args.window,
min_count=0,
sg=1,
hs=1,
workers=args.workers)
print("done.., cost: {}s".format(time.time() - t2))
output = []
for i in range(A.shape[0]):
if str(i) in model.wv:
output.append(model.wv[str(i)])
else:
output.append(np.zeros(args.size))
np.save(args.output + ".npy", np.asarray(output, dtype=np.float32))
print("saved.")
def deepWalk(_windowSize=5, _embeddingSize=128, _walkLength=35):
X, A, y = data_utils_cora.load_data(dataset='cora')
graph = Graph(A)
walk = []
vector = list(graph.vector)
#build corpus from random walks
for vect in range(0, len(vector)):
walk.append(graph.randomWalk(_walkLength, vect))
#set hyperparameters - word2vec utilises the skipgram algorithm to create word embeddings
model = Word2Vec(walk,
size=_embeddingSize,
window=_windowSize,
min_count=0,
sg=1,
hs=1,
workers=4)
G = Graph.sparse(A)
y = np.ravel(np.array([np.where(y[i] == 1)[0] for i in range(y.shape[0])]))
X = np.array([model.wv[str(i)] for i in range(len(G))])
features = np.asarray([model[str(X)] for X in range(len(Graph.sparse(A)))])
y_train, y_val, y_test, idx_train, idx_val, idx_test = data_utils_cora.get_splits(
y)
x_train, x_val, x_test, idx_train, idx_val, idx_test = data_utils_cora.get_splits(
X)
test = LogisticRegression(max_iter=500,
multi_class='ovr').fit(features[idx_train],
y[idx_train].ravel())
test.fit(x_train, y_train)
print(test.score(x_train, y_train))
print(test.score(x_test, y_test))
def train(args):
_, A, _ = load_data(path=args.path, dataset=args.dataset)
row, col = A.nonzero()
edges = np.concatenate((row.reshape(-1, 1), col.reshape(-1, 1)), axis=1)
edge_sampler = AliasSampling(probs=A.data / np.sum(A.data))
node_weights = np.power(np.asarray(A.sum(axis=0)).flatten(), 0.75)
node_sampler = AliasSampling(probs=node_weights / np.sum(node_weights))
learning_rate = args.rho
line = Line(A.shape[0], args.size)
optimizer = optim.Adadelta(line.parameters(), lr=learning_rate)
if args.gpu and torch.cuda.is_available():
line.cuda()
sampling_time, training_time = 0, 0
line.train()
for i in range(args.batch_num):
t1 = time.time()
u_i, u_j, label = get_batch(A,
edges=edges,
edge_sampler=edge_sampler,
node_sampler=node_sampler,
batch_size=args.batch_size,
negative=args.negative)
t2 = time.time()
sampling_time += t2 - t1
if args.gpu and torch.cuda.is_available():
u_i, u_j, label = Variable(u_i.cuda()), Variable(
u_j.cuda()), Variable(label.cuda())
else:
u_i, u_j, label = Variable(u_i), Variable(u_j), Variable(label)
if i % 100 == 0 and i != 0:
print('Batch_no: {:06d}'.format(i),
'loss: {:.4f}'.format(loss.data[0]),
'rho: {:.4f}'.format(learning_rate),
'sampling_time: {:.4f}'.format(sampling_time),
'training_time: {:.4f}'.format(training_time))
sampling_time, training_time = 0, 0
else:
optimizer.zero_grad()
loss = line(u_i, u_j, label)
# loss = F.kl_div(output, label)
# print("__loss: {:.4f}".format(loss.data[0]))
loss.backward()
# print("line.embeddings.weight.grad:", np.max(np.array(line.embeddings.weight.grad.data)))
# if line.order == 2:
# print("line.context_embedding.weight.grad:", np.max(np.array(line.context_embedding.weight.grad.data)))
optimizer.step()
training_time += time.time() - t2
if learning_rate > args.rho * 1e-4:
learning_rate = args.rho * (1 - i / args.batch_num)
else:
learning_rate = args.rho * 1e-4
optimizer = optim.Adadelta(line.parameters(), lr=learning_rate)
print("done..")
if args.gpu and torch.cuda.is_available():
np.save(args.output + "_" + str(args.order) + ".npy",
F.normalize(line.embeddings.cpu().weight).data.numpy())
else:
np.save(args.output + "_" + str(args.order) + ".npy",
F.normalize(line.embeddings.weight).data.numpy())
print("saved.")
np.random.seed(2018)
torch.manual_seed(2018)
class LogisticRegression(nn.Module):
def __init__(self, input_size, num_classes):
super(LogisticRegression, self).__init__()
self.linear = nn.Linear(input_size, num_classes)
def forward(self, x):
out = self.linear(x)
# out = F.relu(out)
return F.log_softmax(out, dim=1)
X, A, y = load_data(dataset='cora')
y_train, y_val, y_test, idx_train, idx_val, idx_test = get_splits('cora', y)
METHOD = "line"
PARA = "_4_0.25" if METHOD == "node2vec" else ""
if METHOD == "line":
PARA = "_2"
# embeddings = np.genfromtxt("workspace/vec_2nd_wo_norm10000.txt", skip_header=1, dtype=np.float32)[:, 1:]
# from sklearn.preprocessing import normalize
# embeddings = normalize(embeddings, axis=1)
embeddings = np.load("workspace/" + METHOD + "_embedding_cora" + PARA + ".npy")
# embeddings = np.load("workspace/line.tensorflow_7w.npy")
# print(embeddings[0:5])
def train(args):
_, A, _ = load_data(path=args.path, dataset=args.dataset)
row, col = A.nonzero()
edges = np.concatenate((row.reshape(-1, 1), col.reshape(-1, 1)),
axis=1).astype(dtype=np.dtype(str))
print("build")
t1 = time.time()
G, node_samplers, edge_samplers = {}, {}, {}
for [i, j] in edges:
if i not in G:
G[i] = []
if j not in G:
G[j] = []
G[i].append(j)
G[j].append(i)
for node in G:
G[node] = list(sorted(set(G[node])))
if node in G[node]:
G[node].remove(node)
node_samplers[node] = alias_sampler(probs=A[int(node), :].data /
np.sum(A[int(node), :].data))
for [i, j] in edges:
edge_weights = []
for j_nbr in G[j]:
if j_nbr == i:
edge_weights.append(A[int(j), int(j_nbr)] / args.p)
elif A[int(j_nbr), int(i)] >= 1e-4:
edge_weights.append(A[int(j), int(j_nbr)])
else:
edge_weights.append(A[int(j), int(j_nbr)] / args.q)
edge_weights = np.asarray(edge_weights, dtype=np.float32)
edge_samplers[i + "-" + j] = alias_sampler(probs=edge_weights /
edge_weights.sum())
nodes = list(sorted(G.keys()))
print("len(G.keys()):", len(G.keys()), "\tnode_num:", A.shape[0])
corpus = []
for cnt in range(args.number_walks):
random.shuffle(nodes)
for idx, node in enumerate(nodes):
path = [node]
while len(path) < args.walk_length:
cur = path[-1]
if len(G[cur]) > 0:
if len(path) == 1:
path.append(G[cur][sampling(node_samplers[cur][0],
node_samplers[cur][1])])
else:
prev = path[-2]
path.append(G[cur][sampling(
edge_samplers[prev + "-" + cur][0],
edge_samplers[prev + "-" + cur][1])])
else:
break
corpus.append(path)
t2 = time.time()
print("cost: {}s".format(t2 - t1))
print("train...")
model = Word2Vec(corpus,
size=args.size,
window=args.window,
min_count=0,
sg=1,
workers=args.workers)
print("done.., cost: {}s".format(time.time() - t2))
output = []
for i in range(A.shape[0]):
if str(i) in model.wv:
output.append(model.wv[str(i)])
else:
output.append(np.zeros(args.size))
np.save(args.output + "_" + str(args.p) + "_" + str(args.q) + ".npy",
np.asarray(output, dtype=np.float32))
print("saved.")
