def test_vgae():
model = VGAE(encoder=lambda x: (x, x))
x = torch.Tensor([[1, -1], [1, 2], [2, 1]])
model.encode(x)
assert model.kl_loss().item() > 0
model.eval()
model.encode(x)
def train_model_and_save_embeddings(dataset, data, epochs, learning_rate,
device):
# Define Model
encoder = EmbeddingEncoder(emb_dim=200,
out_channels=64,
n_nodes=dataset.num_nodes).to(device)
decoder = CosineSimDecoder().to(device)
model = VGAE(encoder=encoder, decoder=decoder).to(device)
node_features, train_pos_edge_index = data.x.to(
device), data.edge_index.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate)
# data.edge_index = data.edge_index.long()
assert data.edge_index.max().item() < dataset.num_nodes
data_loader = NeighborSampler(data,
size=[25, 10],
num_hops=2,
batch_size=10000,
shuffle=False,
add_self_loops=False)
model.train()
for epoch in tqdm(range(epochs)):
epoch_loss = 0.0
for data_flow in tqdm(data_loader()):
optimizer.zero_grad()
data_flow = data_flow.to(device)
block = data_flow[0]
embeddings = model.encode(
node_features[block.n_id], block.edge_index
) # TODO Avoid computation of all node features!
loss = model.recon_loss(embeddings, block.edge_index)
loss = loss + (1 / len(block.n_id)) * model.kl_loss()
epoch_loss += loss.item()
# Compute gradients
loss.backward()
# Perform optimization step
optimizer.step()
z = model.encode(node_features, train_pos_edge_index)
torch.save(z.cpu(), "large_emb.pt")
print(f"Loss after epoch {epoch} / {epochs}: {epoch_loss}")
return model
def main():
model_name = 'VGAE'
disease_gene_files = [
'data/OMIM/3-fold-1.txt', 'data/OMIM/3-fold-2.txt',
'data/OMIM/3-fold-3.txt'
]
disease_disease_file = 'data/MimMiner/MimMiner.txt'
gene_gene_file = 'data/HumanNetV2/HumanNet_V2.txt'
prediction_files = [
f'data/prediction/{model_name}/prediction-3-fold-1.txt',
f'data/prediction/{model_name}/prediction-3-fold-2.txt',
f'data/prediction/{model_name}/prediction-3-fold-3.txt'
]
for counter in [3]:
g_nx = nx.Graph()
with open(disease_gene_files[counter], 'r') as f:
for line in f:
node1, node2, tag = line.strip().split('\t')
if tag == 'train':
g_nx.add_node(node1)
g_nx.add_node(node2)
g_nx.add_edge(node1, node2, weight=1)
with open(gene_gene_file, 'r') as f:
for line in f:
node1, node2 = line.strip().split('\t')
g_nx.add_node(node1)
g_nx.add_node(node2)
g_nx.add_edge(node1, node2, weight=1)
with open(disease_disease_file, 'r') as f:
for line in f:
node1, node2, weight = line.strip().split('\t')
g_nx.add_node(node1)
g_nx.add_node(node2)
g_nx.add_edge(node1, node2, weight=1)
print('read data success')
name_id = dict(zip(g_nx.nodes(), range(g_nx.number_of_nodes())))
g_nx = nx.relabel_nodes(g_nx, name_id)
# transform from networkx to pyg data
g_nx = g_nx.to_directed() if not nx.is_directed(g_nx) else g_nx
edge_index = torch.tensor(list(g_nx.edges)).t().contiguous()
data = {}
data['edge_index'] = edge_index.view(2, -1)
data = torch_geometric.data.Data.from_dict(data)
data.num_nodes = g_nx.number_of_nodes()
data.x = torch.from_numpy(np.eye(data.num_nodes)).float()
data.train_mask = data.val_mask = data.test_mask = data.y = None
print(
f'Graph information:\nNode:{data.num_nodes}\nEdge:{data.num_edges}\nFeature:{data.num_node_features}'
)
channels = 128
dev = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
model = VGAE(Encoder(data.num_node_features, channels)).to(dev)
x, train_pos_edge_index = data.x.to(dev), data.edge_index.to(dev)
optimizer = torch.optim.Adam(model.parameters(), lr=0.01)
for epoch in range(4000):
model.train()
optimizer.zero_grad()
z = model.encode(x, train_pos_edge_index)
loss = model.recon_loss(
z,
train_pos_edge_index) + (1 / data.num_nodes) * model.kl_loss()
loss.backward()
optimizer.step()
nowTime = datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S')
print(f'{nowTime}\tepoch:{epoch}\tloss:{loss}')
z = model.encode(x, train_pos_edge_index)
pred = model.decoder.forward_all(z).cpu().detach().numpy().tolist()
id_name = {}
diseases = set()
genes = set()
for key in name_id:
id_name[name_id[key]] = key
if key.startswith('g_'):
genes.add(key)
elif key.startswith('d_'):
diseases.add(key)
test_diseases = set()
with open(disease_gene_files[counter], 'r') as f:
for line in f:
disease, gene, tag = line.strip().split('\t')
if tag == 'test':
test_diseases.add(disease)
with open(prediction_files[counter], 'w') as f:
for disease in test_diseases:
sims = {}
if disease not in diseases:
for gene in genes:
sims[gene] = 0
else:
for gene in genes:
sim = pred[name_id[disease]][name_id[gene]]
sims[gene] = sim
sorted_sims = sorted(sims.items(),
key=lambda item: item[1],
reverse=True)
c = 0
for gene, sim in sorted_sims:
f.write(disease + '\t' + gene + '\t' + str(sim) + '\n')
c += 1
if c >= 150:
break
(adj_train_dense.shape[0] * adj_train_dense.shape[0] -
adj_train_dense.sum()) * 2)
z_final = None
for epoch in range(1, 100):
model.train()
optimizer.zero_grad()
z = model.encode(x, train_pos_edge_index)
# loss from binary cross entropy
loss = norm * model.recon_loss(z, train_pos_edge_index)
if args.model == VGAE:
loss = loss + (model.kl_loss() / data.num_nodes)
loss.backward()
optimizer.step()
#last embedding
z_final = z
auc, ap = model.test(z, data.val_pos_edge_index,
data.val_neg_edge_index)
model.eval()
with torch.no_grad():
auc_score, ap_score = model.test(z, data.test_pos_edge_index,
data.test_neg_edge_index)
auc_score_list.append(auc_score * 100)
def run_VGAE(input_data,
output_dir,
epochs=1000,
lr=0.01,
weight_decay=0.0005):
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
print('Device: '.ljust(32), device)
print('Model Name: '.ljust(32), 'VGAE')
print('Model params:{:19} lr: {} weight_decay: {}'.format(
'', lr, weight_decay))
print('Total number of epochs to run: '.ljust(32), epochs)
print('*' * 70)
data = input_data.clone().to(device)
model = VGAE(VGAEncoder(data.num_features,
data.num_classes.item())).to(device)
data = model.split_edges(data)
x, train_pos_edge_index, edge_attr = data.x.to(
device), data.train_pos_edge_index.to(device), data.edge_attr.to(
device)
data.train_idx = data.test_idx = data.y = None
optimizer = torch.optim.Adam(model.parameters(), lr=0.01)
train_losses = []
test_losses = []
aucs = []
aps = []
model.train()
for epoch in range(1, epochs + 1):
train_loss, test_loss = 0, 0
optimizer.zero_grad()
z = model.encode(x, train_pos_edge_index)
train_loss = model.recon_loss(
z, train_pos_edge_index) + (1 / data.num_nodes) * model.kl_loss()
train_losses.append(train_loss.item())
train_loss.backward()
optimizer.step()
model.eval()
with torch.no_grad():
z = model.encode(x, train_pos_edge_index)
auc, ap = model.test(z, data.test_pos_edge_index,
data.test_neg_edge_index)
test_loss = model.recon_loss(
z,
data.test_pos_edge_index) + (1 / data.num_nodes) * model.kl_loss()
test_losses.append(test_loss.item())
aucs.append(auc)
aps.append(ap)
makepath(output_dir)
figname = os.path.join(
output_dir, "_".join(
(VGAE.__name__, str(lr), str(weight_decay), str(epochs))))
# print('AUC: {:.4f}, AP: {:.4f}'.format(auc, ap))
if (epoch % int(epochs / 10) == 0):
print(
'Epoch: {} Train loss: {} Test loss: {} AUC: {} AP: {:.4f}'
.format(epoch, train_loss, test_loss, auc, ap))
if (epoch == epochs):
print(
'-' * 65,
'\nFinal epoch: {} Train loss: {} Test loss: {} AUC: {} AP: {}'
.format(epoch, train_loss, test_loss, auc, ap))
log = 'Final epoch: {} Train loss: {} Test loss: {} AUC: {} AP: {}'.format(
epoch, train_loss, test_loss, auc, ap)
write_log(log, figname)
print('-' * 65)
plot_linkpred(train_losses, test_losses, aucs, aps, output_dir, epochs,
figname)
return