class Flickr8k(VisionDataset):
def __init__(
self,
args,
root: str,
ann_file: str,
transform: Optional[Callable] = None,
target_transform: Optional[Callable] = None,
) -> None:
super(Flickr8k, self).__init__(root,
transform=transform,
target_transform=target_transform)
self.annotations = torch.load(ann_file, map_location='cpu')
self.ids = list(sorted(self.annotations.keys()))
self.vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
sentences = []
for key in self.annotations.keys():
sentences += self.annotations[key]
self.vocab.build_vocab(sentences)
def __getitem__(self, index: int) -> Tuple[Any, Any]:
img_id = self.ids[index]
# Image
img = Image.open(img_id).convert('RGB')
if self.transform is not None:
img = self.transform(img)
# Captions
target = self.annotations[img_id]
if self.target_transform is not None:
target = self.target_transform(target)
return img, target
def __len__(self) -> int:
return len(self.ids)
def get_vocab(self):
return self.vocab
def __init__(
self,
args,
root: str,
ann_file: str,
transform: Optional[Callable] = None,
target_transform: Optional[Callable] = None,
) -> None:
super(Flickr8k, self).__init__(root,
transform=transform,
target_transform=target_transform)
self.annotations = torch.load(ann_file, map_location='cpu')
self.ids = list(sorted(self.annotations.keys()))
self.vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
sentences = []
for key in self.annotations.keys():
sentences += self.annotations[key]
self.vocab.build_vocab(sentences)
def main(args):
# 0. initial setting
# set environmet
cudnn.benchmark = True
if not os.path.isdir('./ckpt'):
os.mkdir('./ckpt')
if not os.path.isdir('./results'):
os.mkdir('./results')
if not os.path.isdir(os.path.join('./ckpt', args.name)):
os.mkdir(os.path.join('./ckpt', args.name))
if not os.path.isdir(os.path.join('./results', args.name)):
os.mkdir(os.path.join('./results', args.name))
if not os.path.isdir(os.path.join('./results', args.name, "log")):
os.mkdir(os.path.join('./results', args.name, "log"))
# set logger
logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(message)s')
handler = logging.FileHandler("results/{}/log/{}.log".format(
args.name, time.strftime('%c', time.localtime(time.time()))))
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.addHandler(logging.StreamHandler())
args.logger = logger
# set cuda
if torch.cuda.is_available():
args.logger.info("running on cuda")
args.device = torch.device("cuda")
args.use_cuda = True
else:
args.logger.info("running on cpu")
args.device = torch.device("cpu")
args.use_cuda = False
args.logger.info("[{}] starts".format(args.name))
# 1. load data
args.logger.info("loading data...")
src, tgt = load_data(args.path)
src_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
src_vocab.load(os.path.join(args.path, 'vocab.en'))
tgt_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
tgt_vocab.load(os.path.join(args.path, 'vocab.de'))
# 2. setup
args.logger.info("setting up...")
sos_idx = 0
eos_idx = 1
pad_idx = 2
max_length = 50
src_vocab_size = len(src_vocab)
tgt_vocab_size = len(tgt_vocab)
# transformer config
d_e = 512 # embedding size
d_q = 64 # query size (= key, value size)
d_h = 2048 # hidden layer size in feed forward network
num_heads = 8
num_layers = 6 # number of encoder/decoder layers in encoder/decoder
args.sos_idx = sos_idx
args.eos_idx = eos_idx
args.pad_idx = pad_idx
args.max_length = max_length
args.src_vocab_size = src_vocab_size
args.tgt_vocab_size = tgt_vocab_size
args.d_e = d_e
args.d_q = d_q
args.d_h = d_h
args.num_heads = num_heads
args.num_layers = num_layers
model = Transformer(args)
model.to(args.device)
loss_fn = nn.CrossEntropyLoss(ignore_index=pad_idx)
optimizer = optim.Adam(model.parameters(), lr=1e-5)
if args.load:
model.load_state_dict(load(args, args.ckpt))
# 3. train / test
if not args.test:
# train
args.logger.info("starting training")
acc_val_meter = AverageMeter(name="Acc-Val (%)",
save_all=True,
save_dir=os.path.join(
'results', args.name))
train_loss_meter = AverageMeter(name="Loss",
save_all=True,
save_dir=os.path.join(
'results', args.name))
train_loader = get_loader(src['train'],
tgt['train'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size,
shuffle=True)
valid_loader = get_loader(src['valid'],
tgt['valid'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
for epoch in range(1, 1 + args.epochs):
spent_time = time.time()
model.train()
train_loss_tmp_meter = AverageMeter()
for src_batch, tgt_batch in tqdm(train_loader):
# src_batch: (batch x source_length), tgt_batch: (batch x target_length)
optimizer.zero_grad()
src_batch, tgt_batch = torch.LongTensor(src_batch).to(
args.device), torch.LongTensor(tgt_batch).to(args.device)
batch = src_batch.shape[0]
# split target batch into input and output
tgt_batch_i = tgt_batch[:, :-1]
tgt_batch_o = tgt_batch[:, 1:]
pred = model(src_batch.to(args.device),
tgt_batch_i.to(args.device))
loss = loss_fn(pred.contiguous().view(-1, tgt_vocab_size),
tgt_batch_o.contiguous().view(-1))
loss.backward()
optimizer.step()
train_loss_tmp_meter.update(loss / batch, weight=batch)
train_loss_meter.update(train_loss_tmp_meter.avg)
spent_time = time.time() - spent_time
args.logger.info(
"[{}] train loss: {:.3f} took {:.1f} seconds".format(
epoch, train_loss_tmp_meter.avg, spent_time))
# validation
model.eval()
acc_val_tmp_meter = AverageMeter()
spent_time = time.time()
for src_batch, tgt_batch in tqdm(valid_loader):
src_batch, tgt_batch = torch.LongTensor(
src_batch), torch.LongTensor(tgt_batch)
tgt_batch_i = tgt_batch[:, :-1]
tgt_batch_o = tgt_batch[:, 1:]
with torch.no_grad():
pred = model(src_batch.to(args.device),
tgt_batch_i.to(args.device))
corrects, total = val_check(
pred.max(dim=-1)[1].cpu(), tgt_batch_o)
acc_val_tmp_meter.update(100 * corrects / total, total)
spent_time = time.time() - spent_time
args.logger.info(
"[{}] validation accuracy: {:.1f} %, took {} seconds".format(
epoch, acc_val_tmp_meter.avg, spent_time))
acc_val_meter.update(acc_val_tmp_meter.avg)
if epoch % args.save_period == 0:
save(args, "epoch_{}".format(epoch), model.state_dict())
acc_val_meter.save()
train_loss_meter.save()
else:
# test
args.logger.info("starting test")
test_loader = get_loader(src['test'],
tgt['test'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
pred_list = []
model.eval()
for src_batch, tgt_batch in test_loader:
#src_batch: (batch x source_length)
src_batch = torch.Tensor(src_batch).long().to(args.device)
batch = src_batch.shape[0]
pred_batch = torch.zeros(batch, 1).long().to(args.device)
pred_mask = torch.zeros(batch, 1).bool().to(
args.device) # mask whether each sentece ended up
with torch.no_grad():
for _ in range(args.max_length):
pred = model(
src_batch,
pred_batch) # (batch x length x tgt_vocab_size)
pred[:, :, pad_idx] = -1 # ignore <pad>
pred = pred.max(dim=-1)[1][:, -1].unsqueeze(
-1) # next word prediction: (batch x 1)
pred = pred.masked_fill(
pred_mask,
2).long() # fill out <pad> for ended sentences
pred_mask = torch.gt(pred.eq(1) + pred.eq(2), 0)
pred_batch = torch.cat([pred_batch, pred], dim=1)
if torch.prod(pred_mask) == 1:
break
pred_batch = torch.cat([
pred_batch,
torch.ones(batch, 1).long().to(args.device) + pred_mask.long()
],
dim=1) # close all sentences
pred_list += seq2sen(pred_batch.cpu().numpy().tolist(), tgt_vocab)
with open('results/pred.txt', 'w', encoding='utf-8') as f:
for line in pred_list:
f.write('{}\n'.format(line))
os.system(
'bash scripts/bleu.sh results/pred.txt multi30k/test.de.atok')
def main(args):
src, tgt = load_data(args.path)
src_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
src_vocab.load(os.path.join(args.path, 'vocab.en'))
tgt_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
tgt_vocab.load(os.path.join(args.path, 'vocab.de'))
sos_idx = 0
eos_idx = 1
pad_idx = 2
max_length = 50
src_vocab_size = len(src_vocab)
tgt_vocab_size = len(tgt_vocab)
# Set hyper parameter
device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
model = make_model(src_vocab_size, tgt_vocab_size).to(device)
optimizer = get_std_opt(model)
criterion = LabelSmoothing(size=tgt_vocab_size,
padding_idx=pad_idx,
smoothing=0.1)
train_criterion = SimpleLossCompute(model.generator, criterion, optimizer)
valid_criterion = SimpleLossCompute(model.generator, criterion, None)
print('Using device:', device)
if not args.test:
train_loader = get_loader(src['train'],
tgt['train'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size,
shuffle=True)
valid_loader = get_loader(src['valid'],
tgt['valid'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
best_loss = 987654321
for epoch in range(args.epochs):
train_total_loss, valid_total_loss = 0.0, 0.0
start = time.time()
total_tokens = 0
tokens = 0
model.train()
# Train
for src_batch, tgt_batch in train_loader:
src_batch = torch.tensor(src_batch).to(device)
tgt_batch = torch.tensor(tgt_batch).to(device)
batch = Batch(src_batch, tgt_batch, pad_idx)
prediction = model(batch.src, batch.trg, batch.src_mask,
batch.trg_mask)
loss = train_criterion(prediction, batch.trg_y, batch.ntokens)
train_total_loss += loss
total_tokens += batch.ntokens
tokens += batch.ntokens
# Valid
model.eval()
for src_batch, tgt_batch in valid_loader:
src_batch = torch.tensor(src_batch).to(device)
tgt_batch = torch.tensor(tgt_batch).to(device)
batch = Batch(src_batch, tgt_batch, pad_idx)
prediction = model(batch.src, batch.trg, batch.src_mask,
batch.trg_mask)
loss = valid_criterion(prediction, batch.trg_y, batch.ntokens)
valid_total_loss += loss
total_tokens += batch.ntokens
tokens += batch.ntokens
if valid_total_loss.item() < best_loss:
best_loss = valid_total_loss
best_model_state = model.state_dict()
best_optimizer_state = optimizer.optimizer.state_dict()
elpsed = time.time() - start
print(
time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) + "|| [" +
str(epoch) + "/" + str(args.epochs) + "], train_loss = " +
str(train_total_loss.item()) + ", valid_loss = " +
str(valid_total_loss.item()) + ", Tokens per Sec = " +
str(tokens.item() / elpsed))
tokens = 0
start = time.time()
if epoch % 100 == 0:
# Save model
torch.save(
{
'epoch': args.epochs,
'model_state_dict': best_model_state,
'optimizer_state': best_optimizer_state,
'loss': best_loss
}, args.model_dir + "/intermediate.pt")
print("Model saved")
# Save model
torch.save(
{
'epoch': args.epochs,
'model_state_dict': best_model_state,
'optimizer_state': best_optimizer_state,
'loss': best_loss
}, args.model_dir + "/best.pt")
print("Model saved")
else:
# Load the model
checkpoint = torch.load(args.model_dir + "/" + args.model_name,
map_location=device)
model.load_state_dict(checkpoint['model_state_dict'])
optimizer.optimizer.load_state_dict(checkpoint['optimizer_state'])
model.eval()
print("Model loaded")
# Test
test_loader = get_loader(src['test'],
tgt['test'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
pred = []
for src_batch, tgt_batch in test_loader:
src_batch = torch.tensor(src_batch).to(device)
tgt_batch = torch.tensor(tgt_batch).to(device)
batch = Batch(src_batch, tgt_batch, pad_idx)
# Get pred_batch
memory = model.encode(batch.src, batch.src_mask)
pred_batch = torch.ones(src_batch.size(0), 1)\
.fill_(sos_idx).type_as(batch.src.data).to(device)
for i in range(max_length - 1):
out = model.decode(
memory, batch.src_mask, Variable(pred_batch),
Variable(
Batch.make_std_mask(pred_batch,
pad_idx).type_as(batch.src.data)))
prob = model.generator(out[:, -1])
prob.index_fill_(1,
torch.tensor([sos_idx, pad_idx]).to(device),
-float('inf'))
_, next_word = torch.max(prob, dim=1)
pred_batch = torch.cat(
[pred_batch, next_word.unsqueeze(-1)], dim=1)
pred_batch = torch.cat([pred_batch, torch.ones(src_batch.size(0), 1)\
.fill_(eos_idx).type_as(batch.src.data).to(device)], dim=1)
# every sentences in pred_batch should start with <sos> token (index: 0) and end with <eos> token (index: 1).
# every <pad> token (index: 2) should be located after <eos> token (index: 1).
# example of pred_batch:
# [[0, 5, 6, 7, 1],
# [0, 4, 9, 1, 2],
# [0, 6, 1, 2, 2]]
pred += seq2sen(pred_batch.tolist(), tgt_vocab)
with open('results/pred.txt', 'w', encoding='utf-8') as f:
for line in pred:
f.write('{}\n'.format(line))
os.system(
'bash scripts/bleu.sh results/pred.txt multi30k/test.de.atok')
def main(args):
src, tgt = load_data(args.path)
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
print(device)
src_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
src_vocab.load(os.path.join(args.path, 'vocab.en'))
tgt_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
tgt_vocab.load(os.path.join(args.path, 'vocab.de'))
sos_idx = 0
eos_idx = 1
pad_idx = 2
max_length = 50
src_vocab_size = len(src_vocab)
tgt_vocab_size = len(tgt_vocab)
N = 6
dim = 512
# MODEL Construction
encoder = Encoder(N, dim, pad_idx, src_vocab_size, device).to(device)
decoder = Decoder(N, dim, pad_idx, tgt_vocab_size, device).to(device)
if args.model_load:
ckpt = torch.load("drive/My Drive/checkpoint/best.ckpt")
encoder.load_state_dict(ckpt["encoder"])
decoder.load_state_dict(ckpt["decoder"])
params = list(encoder.parameters()) + list(decoder.parameters())
if not args.test:
train_loader = get_loader(src['train'],
tgt['train'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size,
shuffle=True)
valid_loader = get_loader(src['valid'],
tgt['valid'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
warmup = 4000
steps = 1
lr = 1. * (dim**-0.5) * min(steps**-0.5, steps * (warmup**-1.5))
optimizer = torch.optim.Adam(params,
lr=lr,
betas=(0.9, 0.98),
eps=1e-09)
train_losses = []
val_losses = []
latest = 1e08 # to store latest checkpoint
start_epoch = 0
if (args.model_load):
start_epoch = ckpt["epoch"]
optimizer.load_state_dict(ckpt["optim"])
steps = start_epoch * 30
for epoch in range(start_epoch, args.epochs):
for src_batch, tgt_batch in train_loader:
encoder.train()
decoder.train()
optimizer.zero_grad()
tgt_batch = torch.LongTensor(tgt_batch)
src_batch = Variable(torch.LongTensor(src_batch)).to(device)
gt = Variable(tgt_batch[:, 1:]).to(device)
tgt_batch = Variable(tgt_batch[:, :-1]).to(device)
enc_output, seq_mask = encoder(src_batch)
dec_output = decoder(tgt_batch, enc_output, seq_mask)
gt = gt.view(-1)
dec_output = dec_output.view(gt.size()[0], -1)
loss = F.cross_entropy(dec_output, gt, ignore_index=pad_idx)
loss.backward()
train_losses.append(loss.item())
optimizer.step()
steps += 1
lr = (dim**-0.5) * min(steps**-0.5, steps * (warmup**-1.5))
update_lr(optimizer, lr)
if (steps % 10 == 0):
print("loss : %f" % loss.item())
for src_batch, tgt_batch in valid_loader:
encoder.eval()
decoder.eval()
src_batch = Variable(torch.LongTensor(src_batch)).to(device)
tgt_batch = torch.LongTensor(tgt_batch)
gt = Variable(tgt_batch[:, 1:]).to(device)
tgt_batch = Variable(tgt_batch[:, :-1]).to(device)
enc_output, seq_mask = encoder(src_batch)
dec_output = decoder(tgt_batch, enc_output, seq_mask)
gt = gt.view(-1)
dec_output = dec_output.view(gt.size()[0], -1)
loss = F.cross_entropy(dec_output, gt, ignore_index=pad_idx)
val_losses.append(loss.item())
print("[EPOCH %d] Loss %f" % (epoch, loss.item()))
if (val_losses[-1] <= latest):
checkpoint = {'encoder':encoder.state_dict(), 'decoder':decoder.state_dict(), \
'optim':optimizer.state_dict(), 'epoch':epoch}
torch.save(checkpoint, "drive/My Drive/checkpoint/best.ckpt")
latest = val_losses[-1]
if (epoch % 20 == 0):
plt.figure()
plt.plot(val_losses)
plt.xlabel("epoch")
plt.ylabel("model loss")
plt.show()
else:
# test
test_loader = get_loader(src['test'],
tgt['test'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
# LOAD CHECKPOINT
pred = []
for src_batch, tgt_batch in test_loader:
encoder.eval()
decoder.eval()
b_s = min(args.batch_size, len(src_batch))
tgt_batch = torch.zeros(b_s, 1).to(device).long()
src_batch = Variable(torch.LongTensor(src_batch)).to(device)
enc_output, seq_mask = encoder(src_batch)
pred_batch = decoder(tgt_batch, enc_output, seq_mask)
_, pred_batch = torch.max(pred_batch, 2)
while (not is_finished(pred_batch, max_length, eos_idx)):
# do something
next_input = torch.cat((tgt_batch, pred_batch.long()), 1)
pred_batch = decoder(next_input, enc_output, seq_mask)
_, pred_batch = torch.max(pred_batch, 2)
# every sentences in pred_batch should start with <sos> token (index: 0) and end with <eos> token (index: 1).
# every <pad> token (index: 2) should be located after <eos> token (index: 1).
# example of pred_batch:
# [[0, 5, 6, 7, 1],
# [0, 4, 9, 1, 2],
# [0, 6, 1, 2, 2]]
pred_batch = pred_batch.tolist()
for line in pred_batch:
line[-1] = 1
pred += seq2sen(pred_batch, tgt_vocab)
# print(pred)
with open('results/pred.txt', 'w') as f:
for line in pred:
f.write('{}\n'.format(line))
os.system(
'bash scripts/bleu.sh results/pred.txt multi30k/test.de.atok')
def main(args):
src, tgt = load_data(args.path)
src_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
src_vocab.load(os.path.join(args.path, 'vocab.en'))
tgt_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
tgt_vocab.load(os.path.join(args.path, 'vocab.de'))
vsize_src = len(src_vocab)
vsize_tar = len(tgt_vocab)
net = Transformer(vsize_src, vsize_tar)
if not args.test:
train_loader = get_loader(src['train'],
tgt['train'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size,
shuffle=True)
valid_loader = get_loader(src['valid'],
tgt['valid'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
net.to(device)
optimizer = optim.Adam(net.parameters(), lr=args.lr)
best_valid_loss = 10.0
for epoch in range(args.epochs):
print("Epoch {0}".format(epoch))
net.train()
train_loss = run_epoch(net, train_loader, optimizer)
print("train loss: {0}".format(train_loss))
net.eval()
valid_loss = run_epoch(net, valid_loader, None)
print("valid loss: {0}".format(valid_loss))
torch.save(net, 'data/ckpt/last_model')
if valid_loss < best_valid_loss:
best_valid_loss = valid_loss
torch.save(net, 'data/ckpt/best_model')
else:
# test
net = torch.load('data/ckpt/best_model')
net.to(device)
net.eval()
test_loader = get_loader(src['test'],
tgt['test'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
pred = []
iter_cnt = 0
for src_batch, tgt_batch in test_loader:
source, src_mask = make_tensor(src_batch)
source = source.to(device)
src_mask = src_mask.to(device)
res = net.decode(source, src_mask)
pred_batch = res.tolist()
# every sentences in pred_batch should start with <sos> token (index: 0) and end with <eos> token (index: 1).
# every <pad> token (index: 2) should be located after <eos> token (index: 1).
# example of pred_batch:
# [[0, 5, 6, 7, 1],
# [0, 4, 9, 1, 2],
# [0, 6, 1, 2, 2]]
pred += seq2sen(pred_batch, tgt_vocab)
iter_cnt += 1
#print(pred_batch)
with open('data/results/pred.txt', 'w') as f:
for line in pred:
f.write('{}\n'.format(line))
os.system(
'bash scripts/bleu.sh data/results/pred.txt data/multi30k/test.de.atok'
)
def main(args):
src, tgt = load_data(args.path)
src_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
src_vocab.load(os.path.join(args.path, 'vocab.en'))
tgt_vocab = Vocab(init_token='<sos>',
eos_token='<eos>',
pad_token='<pad>',
unk_token='<unk>')
tgt_vocab.load(os.path.join(args.path, 'vocab.de'))
# TODO: use these information.
sos_idx = 0
eos_idx = 1
pad_idx = 2
max_length = 50
# TODO: use these values to construct embedding layers
src_vocab_size = len(src_vocab)
tgt_vocab_size = len(tgt_vocab)
if not args.test:
train_loader = get_loader(src['train'],
tgt['train'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size,
shuffle=True)
valid_loader = get_loader(src['valid'],
tgt['valid'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
# TODO: train
for epoch in range(args.epochs):
for src_batch, tgt_batch in train_loader:
pass
# TODO: validation
for src_batch, tgt_batch in valid_loader:
pass
else:
# test
test_loader = get_loader(src['test'],
tgt['test'],
src_vocab,
tgt_vocab,
batch_size=args.batch_size)
pred = []
for src_batch, tgt_batch in test_loader:
# TODO: predict pred_batch from src_batch with your model.
pred_batch = tgt_batch
# every sentences in pred_batch should start with <sos> token (index: 0) and end with <eos> token (index: 1).
# every <pad> token (index: 2) should be located after <eos> token (index: 1).
# example of pred_batch:
# [[0, 5, 6, 7, 1],
# [0, 4, 9, 1, 2],
# [0, 6, 1, 2, 2]]
pred += seq2sen(pred_batch, tgt_vocab)
with open('results/pred.txt', 'w') as f:
for line in pred:
f.write('{}\n'.format(line))
os.system(
'bash scripts/bleu.sh results/pred.txt multi30k/test.de.atok')