def test(args):
test_data_src = read_corpus(args.test_src, source='src')
test_data_tgt = read_corpus(args.test_tgt, source='tgt')
test_data = list(zip(test_data_src, test_data_tgt))
if args.load_model:
print('load model from [%s]' % args.load_model)
params = torch.load(args.load_model,
map_location=lambda storage, loc: storage)
vocab = params['vocab']
saved_args = params['args']
state_dict = params['state_dict']
model = NMT(saved_args, vocab)
model.load_state_dict(state_dict)
else:
vocab = torch.load(args.vocab)
model = NMT(args, vocab)
model.eval()
if args.cuda:
# model = nn.DataParallel(model).cuda()
model = model.cuda()
hypotheses = decode(model, test_data)
top_hypotheses = [hyps[0] for hyps in hypotheses]
bleu_score = get_bleu([tgt for src, tgt in test_data], top_hypotheses)
word_acc = get_acc([tgt for src, tgt in test_data], top_hypotheses,
'word_acc')
sent_acc = get_acc([tgt for src, tgt in test_data], top_hypotheses,
'sent_acc')
print('Corpus Level BLEU: %f, word level acc: %f, sentence level acc: %f' %
(bleu_score, word_acc, sent_acc),
file=sys.stderr)
if args.save_to_file:
print('save decoding results to %s' % args.save_to_file)
with open(args.save_to_file, 'w') as f:
for hyps in hypotheses:
f.write(' '.join(hyps[0][1:-1]) + '\n')
if args.save_nbest:
nbest_file = args.save_to_file + '.nbest'
print('save nbest decoding results to %s' % nbest_file)
with open(nbest_file, 'w') as f:
for src_sent, tgt_sent, hyps in zip(test_data_src,
test_data_tgt, hypotheses):
print('Source: %s' % ' '.join(src_sent), file=f)
print('Target: %s' % ' '.join(tgt_sent), file=f)
print('Hypotheses:', file=f)
for i, hyp in enumerate(hyps, 1):
print('[%d] %s' % (i, ' '.join(hyp)), file=f)
print('*' * 30, file=f)
def load(model_path: str):
""" Load the model from a file.
@param model_path (str): path to model
"""
params = torch.load(model_path,
map_location=lambda storage, loc: storage)
args = params['args']
nmt_model = NMT(vocab=params['vocab'], **args)
nmt_model.load_state_dict(params['state_dict'])
model = DPPNMT(nmt_model=nmt_model)
return model
def sample(args):
train_data_src = read_corpus(args.train_src, source='src')
train_data_tgt = read_corpus(args.train_tgt, source='tgt')
train_data = zip(train_data_src, train_data_tgt)
if args.load_model:
print('load model from [%s]' % args.load_model)
params = torch.load(args.load_model,
map_location=lambda storage, loc: storage)
vocab = params['vocab']
opt = params['args']
state_dict = params['state_dict']
model = NMT(opt, vocab)
model.load_state_dict(state_dict)
else:
vocab = torch.load(args.vocab)
model = NMT(args, vocab)
model.eval()
if args.cuda:
# model = nn.DataParallel(model).cuda()
model = model.cuda()
print('begin sampling')
check_every = 10
train_iter = cum_samples = 0
train_time = time.time()
for src_sents, tgt_sents in data_iter(train_data,
batch_size=args.batch_size):
train_iter += 1
samples = model.sample(src_sents,
sample_size=args.sample_size,
to_word=True)
cum_samples += sum(len(sample) for sample in samples)
if train_iter % check_every == 0:
elapsed = time.time() - train_time
print('sampling speed: %d/s' % (cum_samples / elapsed))
cum_samples = 0
train_time = time.time()
for i, tgt_sent in enumerate(tgt_sents):
print('*' * 80)
print('target:' + ' '.join(tgt_sent))
tgt_samples = samples[i]
print('samples:')
for sid, sample in enumerate(tgt_samples, 1):
print('[%d] %s' % (sid, ' '.join(sample[1:-1])))
print('*' * 80)
def interactive(args):
assert args.load_model, 'You have to specify a pre-trained model'
print('load model from [%s]' % args.load_model)
params = torch.load(args.load_model,
map_location=lambda storage, loc: storage)
vocab = params['vocab']
saved_args = params['args']
state_dict = params['state_dict']
model = NMT(saved_args, vocab)
model.load_state_dict(state_dict)
model.eval()
if args.cuda:
# model = nn.DataParallel(model).cuda()
model = model.cuda()
while True:
src_sent = input('Source Sentence:')
src_sent = src_sent.strip().split(' ')
hyps = model.translate(src_sent)
for i, hyp in enumerate(hyps, 1):
print('Hypothesis #%d: %s' % (i, ' '.join(hyp)))
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
train_data_src = read_corpus(args['--train-src'], source='src')
train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
# print("train data")
# print(train_data_src)
# print(len(train_data_tgt))
dev_data_src = read_corpus(args['--dev-src'], source='src')
dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
#print("dev data")
#print(dev_data_src)
#rint(len(dev_data_tgt))
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
#print(train_data)
#print(dev_data)
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
vocab = Vocab.load(args['--vocab'])
# print("vocab")
# print(vocab.src)
# print(vocab.tgt)
model = NMT(embed_size=int(args['--embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=vocab, no_char_decoder=args['--no-char-decoder'])
model.train()
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' % (uniform_init, uniform_init), file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
device = torch.device("cuda:0" if args['--cuda'] else "cpu")
print('use device: %s' % device, file=sys.stderr)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
while True:
epoch += 1
for src_sents, tgt_sents in batch_iter(train_data, batch_size=train_batch_size, shuffle=True):
train_iter += 1
#print(src_sents)
#print(src_sents.shape)
#print(tgt_sents)
#print(tgt_sents.shape)
optimizer.zero_grad()
batch_size = len(src_sents)
example_losses = -model(src_sents, tgt_sents) # (batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(), clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_niter == 0:
print('epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d' % (epoch, train_iter,
cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words),
cum_examples), file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(model, dev_data, batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' % (train_iter, dev_ppl), file=sys.stderr)
is_better = len(hist_valid_scores) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' % model_save_path, file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(), model_save_path + '.optim')
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(args['--lr-decay'])
print('load previously best model and decay learning rate to %f' % lr, file=sys.stderr)
# load model
params = torch.load(model_save_path, map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers', file=sys.stderr)
optimizer.load_state_dict(torch.load(model_save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
exit(0)
def compute_lm_prob(args):
"""
given source-target sentence pairs, compute ppl and log-likelihood
"""
test_data_src = read_corpus(args.test_src, source='src')
test_data_tgt = read_corpus(args.test_tgt, source='tgt')
test_data = zip(test_data_src, test_data_tgt)
if args.load_model:
print('load model from [%s]' % args.load_model)
params = torch.load(args.load_model,
map_location=lambda storage, loc: storage)
vocab = params['vocab']
saved_args = params['args']
state_dict = params['state_dict']
model = NMT(saved_args, vocab)
model.load_state_dict(state_dict)
else:
vocab = torch.load(args.vocab)
model = NMT(args, vocab)
model.eval()
if args.cuda:
# model = nn.DataParallel(model).cuda()
model = model.cuda()
f = open(args.save_to_file, 'w')
for src_sent, tgt_sent in test_data:
src_sents = [src_sent]
tgt_sents = [tgt_sent]
batch_size = len(src_sents)
src_sents_len = [len(s) for s in src_sents]
pred_tgt_word_nums = [len(s[1:])
for s in tgt_sents] # omitting leading `<s>`
# (sent_len, batch_size)
src_sents_var = to_input_variable(src_sents,
model.vocab.src,
cuda=args.cuda,
is_test=True)
tgt_sents_var = to_input_variable(tgt_sents,
model.vocab.tgt,
cuda=args.cuda,
is_test=True)
# (tgt_sent_len, batch_size, tgt_vocab_size)
scores = model(src_sents_var, src_sents_len, tgt_sents_var[:-1])
# (tgt_sent_len * batch_size, tgt_vocab_size)
log_scores = F.log_softmax(scores.view(-1, scores.size(2)))
# remove leading <s> in tgt sent, which is not used as the target
# (batch_size * tgt_sent_len)
flattened_tgt_sents = tgt_sents_var[1:].view(-1)
# (batch_size * tgt_sent_len)
tgt_log_scores = torch.gather(
log_scores, 1, flattened_tgt_sents.unsqueeze(1)).squeeze(1)
# 0-index is the <pad> symbol
tgt_log_scores = tgt_log_scores * (
1. - torch.eq(flattened_tgt_sents, 0).float())
# (tgt_sent_len, batch_size)
tgt_log_scores = tgt_log_scores.view(-1, batch_size) # .permute(1, 0)
# (batch_size)
tgt_sent_scores = tgt_log_scores.sum(dim=0).squeeze()
tgt_sent_word_scores = [
tgt_sent_scores[i].item() / pred_tgt_word_nums[i]
for i in range(batch_size)
]
for src_sent, tgt_sent, score in zip(src_sents, tgt_sents,
tgt_sent_word_scores):
f.write('%s ||| %s ||| %f\n' %
(' '.join(src_sent), ' '.join(tgt_sent), score))
f.close()
def train(args):
data_path = args['--data_path']
model_path = args['--model_path']
use_word2vec = args['--use_word2vec']
word2vec_fpath = args['--word2vec_fpath']
loss_info_interval = int(args['--loss_info_interval'])
dev_info_interval = int(args['--dev_info_interval'])
max_epoch = int(args['--max_epoch'])
num_workers = int(args['--num_workers'])
corpus_limit = None if args['--corpus_limit']=='None' else int(args['--corpus_limit'])
vocab_size = int(args['--vocab_size'])
freq_cutoff = int(args['--freq_cutoff'])
batch_size = int(args['--batch_size'])
hidden_size = int(args['--hidden_size'])
atten_size = int(args['--atten_size'])
dropout_rate = float(args['--dropout_rate'])
embed_size = int(args['--embed_size'])
lr = float(args['--lr'])
lr_decay = float(args['--lr_decay'])
grad_clip = float(args['--grad_clip'])
patience = int(args['--patience'])
trial = int(args['--trial'])
# create vocabulary
print("create source and target vocabulary...")
es_corpus = load_corpus(data_path+'/train.es', 'es', corpus_limit)
vocab_src = VocabEntry.build(es_corpus, vocab_size, freq_cutoff)
en_corpus = load_corpus(data_path+'/train.en', 'en', corpus_limit)
vocab_tgt = VocabEntry.build(en_corpus, vocab_size, freq_cutoff)
vocabulary = Vocab(vocab_src, vocab_tgt)
vocabulary.save()
# vocabulary = Vocab.load()
# create dataloader
print("create dataloader...")
train_dl = generate_dl(data_path, 'train', vocabulary, batch_size, num_workers, corpus_limit)
dev_dl = generate_dl(data_path, 'dev', vocabulary, batch_size, num_workers, corpus_limit)
device = torch.device('cuda:0' if torch.cuda.is_available() else 'cpu')
# load pretrained word2vec
print("load pretrained word2vec...")
if use_word2vec:
word2vec_src = load_word2vec(word2vec_fpath+'/cc.es.300.vec', vocabulary.src, device)
word2vec_tgt = load_word2vec(word2vec_fpath+'/cc.en.300.vec', vocabulary.tgt, device)
word2vec = (word2vec_src, word2vec_tgt)
print("size: src -- {} tgt -- {}".format(word2vec_src.size(), word2vec_tgt.size()))
else:
word2vec = None
# create model and optimizer
model = NMT(hidden_size, atten_size, vocabulary, dropout_rate, word2vec, embed_size)
model.init()
# model = NMT.load(model_path, vocabulary)
model.to(device)
if torch.cuda.device_count() > 1:
print("- - - - - - - - >%d GPUs are being used now!!!"%torch.cuda.device_count())
model_parallel = nn.DataParallel(model)
opt = torch.optim.Adam(model.parameters(), lr, betas=(0.9, 0.99))
# opt.load_state_dict(torch.load(model_path+'/model.bin.optim', map_location=lambda storage, loc: storage))
print("now we start to train this model ...... batch_size %d"%batch_size)
start_time = train_time = time.time()
epoch = iter_cum = example_cum = loss_cum = words_cum = sents_cum = 0
n_patience = n_trial = 0
hist_best_score = float('inf')
while True:
epoch += 1
if epoch>max_epoch:
print("reached maximum number of epoches......")
exit(0)
for source, src_len, target, tgt_len in train_dl:
model_parallel.train()
# print("input size to model {}, {}, {}, {}".format(source.size(), src_len.size(), target.size(), tgt_len.size()))
loss = model_parallel(source.to(device), src_len.to(device), target.to(device), tgt_len.to(device))
# print("output loss size: {}".format(loss.size()))
loss = loss.sum()
loss_avg = loss / len(tgt_len)
loss_avg.backward()
# gradient clipping
torch.nn.utils.clip_grad_norm_(model.parameters(), grad_clip)
opt.step()
opt.zero_grad()
iter_cum += 1
example_cum += len(tgt_len)
loss_cum += loss.item()
words_cum += (tgt_len-1).sum().item()
sents_cum += len(tgt_len)
if iter_cum % loss_info_interval == 0:
pre_time = time.time()
print("epoch: %d, iter: %d, cum. example: %d, avg. loss: %.2f, avg. ppl: %.2f, speed: %.2fwords/sec, time_eclapsed: %d sec"%
(epoch, iter_cum, example_cum, loss_cum/sents_cum, math.exp(loss_cum/words_cum), words_cum/(pre_time-train_time), pre_time-start_time))
train_time = time.time()
loss_cum = words_cum = sents_cum = 0
if iter_cum % dev_info_interval == 0:
print("validation begin ......")
model_parallel.eval()
with torch.no_grad():
loss_dev = words_dev = sents_dev = 0
for source, src_len, target, tgt_len in dev_dl:
loss = model_parallel(source.to(device), src_len.to(device), target.to(device), tgt_len.to(device))
loss = loss.sum()
loss_dev += loss.item()
words_dev += (tgt_len-1).sum().item()
sents_dev += len(tgt_len)
print("avg. loss: %.2f, avg. ppl: %.2f"%(loss_dev/sents_dev, math.exp(loss_dev/words_dev)))
# compare performance with history
is_better = hist_best_score > (loss_dev/sents_dev)
if is_better:
print("model improved, saved to %s ......"%model_path)
n_patience = 0
hist_best_score = loss_dev/sents_dev
model.save(model_path)
torch.save(opt.state_dict(), model_path+'/model.bin.optim')
else:
n_patience += 1
print("hit # %d patience" % n_patience)
print("decay learning rate ......")
lr = opt.param_groups[0]['lr'] * lr_decay
if n_patience > patience:
n_trial += 1
print("hit # %d trial" % n_trial)
if n_trial > trial:
print("early stop!")
exit(0)
n_patience = 0
print("load previous best model")
params = torch.load(model_path+'/model.bin', map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model.to(device)
if torch.cuda.device_count() > 1:
model_parallel = nn.DataParallel(model)
opt.load_state_dict(torch.load(model_path+'/model.bin.optim', map_location=lambda storage, loc: storage))
for param_group in opt.param_groups:
param_group['lr'] = lr
def train(train_data,
dev_data,
vocab,
embed_size=256,
hidden_size=256,
dropout_rate=0.2,
uniform_init=0.1,
device='cpu',
lr=0.001,
batch_size=32,
clip_grad=5.0,
log_every=10,
valid_niter=2000,
save_path='model.bin',
patience=5,
lr_decay=0.5,
max_trials=5,
max_epochs=30):
""" Train the NMT model
Params:
train_data (list of (src_sent, tgt_sent)): list of tuples containing source and target
sentences for training
dev_data (list of (src_sent, tgt_sent)): list of tuples containing source and target
sentences for dev
vocab (Vocab): Vocab object for source and target
embed_size (int): Embedding dimensionality. Default = 256
hidden_size (int): Dimensionality for hidden states. Default = 256
dropout_rate (float): Dropout probability. Default: 0.2
uniform_init (float): If > 0: uniformly initialize all parameters
device (str): device to perform the calc on. Default = 'cpu'
lr (float): learning rate. Default = 0.001
batch_size (int): batch size. Default = 32
clip_grad (float): used in gradient clipping. Default = 5.0
log_every (int): number of iterations to print stats. Default = 10
valid_niter (int): number of iterations to perform validation. Default = 2000
save_path (str): path to save the best model. Default: 'model.bin' in current dir
patience (int): number of iterations to decay learning rate. Default = 5
lr_decay (float): learning rate decay. Default = 0.5
max_trials (int): terminate training after how many trials. Default = 5
max_epochs (int): max number of epochs. Default = 30
Return:
"""
# Create NMT model and put it in train mode
model = NMT(embed_size, hidden_size, vocab, dropout_rate)
model.train()
# Uniformely initialize model parameters if required
if np.abs(uniform_init) > 0.:
print(f'uniformly init parameters [-{uniform_init}, +{uniform_init}]',
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
# Create target vocab mask with 0 for 'padding' index and 1 otherwise
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
# Set model device
device = torch.device(device)
model = model.to(device)
print(f'Using device: {device}', file=sys.stderr)
# Choose optimizer
optimizer = torch.optim.Adam(model.parameters(), lr=lr)
# Initializations
num_trial = 0
train_iter = 0
current_patience = 0
cum_loss = 0
report_loss = 0
cum_tgt_words = 0
report_tgt_words = 0
cum_examples = 0
report_examples = 0
epoch = 0
valid_num = 0
hist_valid_scores = []
train_time = time.time()
begin_time = time.time()
print('begin Maximum Likelihood training')
while True:
epoch += 1
# Iterate over the batches in the training data
for src_sents, tgt_sents in batch_iter(train_data,
batch_size,
shuffle=True):
train_iter += 1
optimizer.zero_grad()
current_batch_size = len(src_sents)
# Calculate loss and backpropagate
example_losses = -model(src_sents,
tgt_sents) # (current_batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / current_batch_size # average loss
loss.backward()
# clip gradient and update parameters
_ = torch.nn.utils.clip_grad_norm_(model.parameters(), clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
print(f'epoch {epoch}, iter {train_iter}, ' \
f'avg. loss {report_loss / report_examples:.2f}, '\
f'avg. ppl {math.exp(report_loss / report_tgt_words):.2f}, ' \
f'cum. examples {cum_examples}, ' \
f'speed {report_tgt_words / (time.time() - train_time):.2f} words/sec, ' \
f'time elapsed {(time.time() - begin_time):.2f} sec', file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_niter == 0:
print(f'epoch {epoch}, iter {train_iter}, cum. loss {cum_loss / cum_examples:.2f}, '\
f'cum. ppl {np.exp(cum_loss / cum_tgt_words):.2f} cum. examples {cum_examples}',
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print(f'validation: iter {train_iter}, dev. ppl {dev_ppl}',
file=sys.stderr)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
# save model and optimizer state
print(f'save the best model to [{save_path}]',
file=sys.stderr)
model.save(save_path)
torch.save(optimizer.state_dict(), save_path + '.optim')
current_patience = 0
elif current_patience < patience:
current_patience += 1
print(f'hit patience {current_patience}', file=sys.stderr)
if current_patience == patience:
num_trial += 1
print(f'hit #{num_trial} trial', file=sys.stderr)
if num_trial == max_trials:
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * lr_decay
print(
f'load previously best model and decay learning rate to {lr}',
file=sys.stderr)
# load model
params = torch.load(
save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
optimizer.load_state_dict(
torch.load(save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
current_patience = 0
if epoch == max_epochs:
print('reached maximum number of epochs!', file=sys.stderr)
exit(0)
def train(args):
""" Train the NMT Model.
"""
train_data_src = read_corpus(args.train_src, source='src')
train_data_tgt = read_corpus(args.train_tgt, source='tgt')
dev_data_src = read_corpus(args.dev_src, source='src')
dev_data_tgt = read_corpus(args.dev_tgt, source='tgt')
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
vocab = Vocab.load(args.vocab_file)
model = NMT(embed_size=args.embed_size,
hidden_size=args.hidden_size,
dropout_rate=args.dropout,
vocab=vocab)
model.train()
if np.abs(args.uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' % (args.uniform_init, args.uniform_init))
for p in model.parameters():
p.data.uniform_(-args.uniform_init, args.uniform_init)
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
device = torch.device("cuda:0" if args.cuda else "cpu")
print('use device: %s' % device)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=args.lr)
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
while True:
epoch += 1
batch_num = math.ceil(len(train_data) / args.batch_size)
current_iter = 0
for src_sents, tgt_sents in batch_iter(train_data, batch_size=args.batch_size, shuffle=True):
current_iter += 1
train_iter += 1
optimizer.zero_grad()
batch_size = len(src_sents)
example_losses = -model(src_sents, tgt_sents)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
torch.nn.utils.clip_grad_norm_(model.parameters(), args.clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
# omitting leading `<s>`
tgt_words_num_to_predict = sum(len(s[1:]) for s in tgt_sents)
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % args.log_every == 0:
print('epoch %d (%d / %d), iter %d, avg. loss %.2f, avg. ppl %.2f '
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' %
(epoch, current_iter, batch_num, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time))
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % args.valid_niter == 0:
print('epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d' % (epoch, train_iter,
cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words),
cum_examples))
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...')
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(model, dev_data, batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' % (train_iter, dev_ppl))
is_better = len(hist_valid_scores) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('epoch %d, iter %d: save currently the best model to [%s]' %
(epoch, train_iter, args.model_path))
model.save(args.model_path)
torch.save(optimizer.state_dict(), args.model_path + '.optim')
elif patience < args.patience:
patience += 1
print('hit patience %d' % patience)
if patience == args.patience:
num_trial += 1
print('hit #%d trial' % num_trial)
if num_trial == args.max_num_trial:
print('early stop!')
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * args.lr_decay
print('load previously best model and decay learning rate to %f' % lr)
# load model
params = torch.load(args.model_path, map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers')
optimizer.load_state_dict(torch.load(args.model_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == args.max_epoch:
print('reached maximum number of epochs!')
return
def train(model_config,
data_config,
output_path,
device,
epoch_size,
max_epoch,
batch_size,
repeats,
decade_rate,
clip_grad,
log_every,
valid_every,
learning_rate=0.0005):
print('use device: %s' % device, file=sys.stderr)
vocab = Vocab.load(data_config["vacab_file"])
model = NMT(vocab=vocab, **model_config)
model = model.to(torch.device(device))
optimizer = torch.optim.Adam(model.parameters(), lr=learning_rate)
data_config.pop("vacab_file", None)
data_loader = DataLoader(**data_config)
batch_queue, loss_queue = data_loader.load_train_data(
epoch_size, max_epoch, batch_size, repeats, decade_rate)
dev_data = data_loader.load_dev_data()
hist_valid_scores = []
train_losses = []
train_iter = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
if os.path.isfile(output_path + '/speech-to-text.model'):
print('loading saved model...')
params = torch.load(output_path + '/speech-to-text.model',
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
print('restoring parameters of the optimizers', file=sys.stderr)
optimizer.load_state_dict(
torch.load(output_path + '/speech-to-text.optim'))
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
hist_valid_scores.append(valid_metric)
print("saved model ppl: ", dev_ppl)
model.train()
train_time = begin_time = time.time()
epoch, voices, tgt_sents = batch_queue.get(True)
while voices is not None and tgt_sents is not None:
train_iter += 1
optimizer.zero_grad()
# print("received voices:", len(voices))
# print("tgt_sents[0]:", len(tgt_sents[0]), tgt_sents[0])
# print("tgt_sents[1]:", len(tgt_sents[1]), tgt_sents[1])
optimizer.zero_grad()
batch_size = len(voices)
sample_losses = -model(voices, tgt_sents)
batch_loss = sample_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
loss_queue.put(report_loss / report_examples)
train_losses.append({
'epoch':
epoch,
'iter':
train_iter,
'loss':
report_loss / report_examples,
'ppl':
math.exp(report_loss / report_tgt_words),
'cum':
cum_examples,
'speed':
report_tgt_words / (time.time() - train_time)
})
if train_iter % log_every == 0:
print(
'epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f '
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec'
% (epoch, train_iter, report_loss / report_examples,
math.exp(report_loss / report_tgt_words), cum_examples,
report_tgt_words /
(time.time() - train_time), time.time() - begin_time),
file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_every == 0:
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' % (train_iter, dev_ppl),
file=sys.stderr)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' % output_path,
file=sys.stderr)
model.save(output_path + '/speech-to-text.model')
torch.save(optimizer.state_dict(),
output_path + '/speech-to-text.optim')
epoch, voices, tgt_sents = batch_queue.get(True)
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
long_logfile = "long_logfiles/" + str(time.time()) + "long.txt"
train_logfile = "train_logfiles/" + str(time.time()) + "train.txt"
dev_logfile = "dev_logfiles/" + str(time.time()) + "dev.txt"
f_long = open(long_logfile, "w")
f_train = open(train_logfile, "w")
# TODO: add hyperparameters
args_tuples = [(arg, args[arg]) for arg in args]
f_train.write("#args_tuples: %s\n" % args_tuples)
for (arg, val) in args_tuples:
f_train.write("#%s: %s\n" % (arg, val))
f_train.write("#epoch, train iter, train score\n")
f_dev = open(dev_logfile, "w")
f_dev.write("#epoch, train iter, dev score, dev accuracy\n")
binary = int(args["--num-classes"]) == 2
train_data = load_train_data(perct=float(args["--train-perct"]),
binary=binary)
dev_data = load_dev_data(dev_perct=float(args["--dev-perct"]),
binary=binary)
train_batch_size = int(args["--batch-size"])
clip_grad = float(args["--clip-grad"])
valid_niter = int(args["--valid-niter"])
log_every = int(args["--log-every"])
model_save_path = args["--save-to"]
embed_size = int(args["--embed-size"])
# TODO: load train data_augmenter based on args
data_augmenter = str(args["--data-aug"]).lower()
print_and_write("Using data augmentation method: %s" % data_augmenter,
f_long)
if data_augmenter == "gaussian":
data_augmenter = GaussianNoiseDataAugmenter(
float(args["--data-aug-amount"]), int(args["--data-aug-nx"]))
elif data_augmenter == "identity":
data_augmenter = NoisyIdentityDataAugmenter(
float(args["--data-aug-amount"]), int(args["--data-aug-nx"]))
elif data_augmenter == "swapdim":
data_augmenter = EmbedDimensionSwapDataAugmenter(
int(args["--data-aug-amount"]), int(args["--data-aug-nx"]))
else:
data_augmenter = BaseDataAugmenter()
# perform augmentation
train_data_aug = data_augmenter.augment(train_data)
print_and_write(
"train size: %d, after aug %d" %
(len(train_data[0]), len(train_data_aug)),
f_long,
)
model = NMT(embed_size=embed_size,
hidden_size=int(args["--hidden-size"]),
num_classes=int(args["--num-classes"]),
dropout_rate=float(args["--dropout"]))
model.train()
uniform_init = float(args["--uniform-init"])
if np.abs(uniform_init) > 0.0:
print_and_write(
"uniformly initialize parameters [-%f, +%f]" %
(uniform_init, uniform_init),
f_long,
)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
device = torch.device("cuda:0" if args["--cuda"] else "cpu")
print_and_write("use device: %s" % device, f_long)
model = model.to(device)
print_and_write("confirming model device %s" % model.device, f_long)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args["--lr"]))
num_trial = 0
train_iter = patience = cum_loss = report_loss = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print_and_write("begin Maximum Likelihood training", f_long)
while True:
epoch += 1
for sentences, sentiments in batch_iter(train_data_aug,
batch_size=train_batch_size,
shuffle=True):
train_iter += 1
optimizer.zero_grad()
example_losses = -model(sentences, sentiments) # (batch_size,)
batch_size = len(
example_losses) # in case data augmentation makes returned
# number of examples > input batch size
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
# train_accuracy = model.compute_accuracy(sentences, sentiments)
print_and_write(
"epoch %d, iter %d, avg. loss %.2f, "
"cum. examples %d, time elapsed %.2f sec" % (
epoch,
train_iter,
report_loss / report_examples,
cum_examples,
time.time() - begin_time,
),
f_long,
)
f_train.write(
"%d, %d, %.2f\n" %
(epoch, train_iter, report_loss / report_examples))
train_time = time.time()
report_loss = report_examples = 0.0
# perform validation
if train_iter % valid_niter == 0:
cum_loss = cum_examples = 0.0
valid_num += 1
print_and_write("begin validation ...", f_long)
# compute dev
dev_score, dev_accuracy = evaluate_dev(
model, dev_data,
batch_size=5000) # dev batch size can be a bit larger
valid_metric = -dev_score # maybe use accuracy instead?
print_and_write(
"validation: iter %d, dev. score %f, dev. accuracy %f" %
(train_iter, dev_score, dev_accuracy),
f_long,
)
f_dev.write("%d, %d, %f, %f\n" %
(epoch, train_iter, dev_score, dev_accuracy))
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
# train_score = evaluate_dev(model, train_data, batch_size=100000)
if is_better:
patience = 0
print_and_write(
"save currently the best model to [%s]" %
model_save_path,
f_long,
)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(),
model_save_path + ".optim")
elif patience < int(args["--patience"]):
patience += 1
print_and_write("hit patience %d" % patience, f_long)
if patience == int(args["--patience"]):
num_trial += 1
print_and_write("hit #%d trial" % num_trial, f_long)
if num_trial == int(args["--max-num-trial"]):
print_and_write("early stop!", f_long)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]["lr"] * float(
args["--lr-decay"])
print_and_write(
"load previously best model and decay learning rate to %f"
% lr,
f_long,
)
# load model
params = torch.load(
model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params["state_dict"])
model = model.to(device)
print_and_write("restore parameters of the optimizers",
f_long)
optimizer.load_state_dict(
torch.load(model_save_path + ".optim"))
# set new lr
for param_group in optimizer.param_groups:
param_group["lr"] = lr
# reset patience
patience = 0
if epoch == int(args["--max-epoch"]):
print_and_write("reached maximum number of epochs!",
f_long)
exit(0)
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
train_data_src = read_corpus(args['--train-src'], source='src')
train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
dev_data_src = read_corpus(args['--dev-src'], source='src')
dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
vocab = Vocab.load(args['--vocab'])
model = NMT(embed_size=int(args['--embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=vocab)
model.train()
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' %
(uniform_init, uniform_init),
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
device = torch.device("cuda:0" if args['--cuda'] else "cpu")
print('use device: %s' % device, file=sys.stderr)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
# Set counters
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
fwd_time = train_time = begin_time = time.time()
# Begin training
print('begin Maximum Likelihood training')
while True:
epoch += 1
# Loop over all data in selection batches
for src_sents, tgt_sents in batch_iter(train_data,
batch_size=train_batch_size,
shuffle=True):
# Sentences must be sorted in length (that is number of words)
src_sents = sorted(src_sents, key=lambda e: len(e), reverse=True)
tgt_sents = sorted(tgt_sents, key=lambda e: len(e), reverse=True)
train_iter += 1
# Zero out gradients, pytorch accumulates them
optimizer.zero_grad()
# Get loss
train_batch_losses = (-model.forward(src_sents, tgt_sents))
batch_loss = train_batch_losses.sum()
loss = batch_loss / train_batch_size
# Get gradients
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
# step
optimizer.step()
# Report progress
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
# Get some report metric
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += train_batch_size
cum_examples += train_batch_size
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# Test saving and loading the model
# test_save_load_model(model=model,optimizer=optimizer)
# perform validation
if train_iter % valid_niter == 0:
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f, cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
#dev_ppl = evaluate_ppl(model, dev_data, batch_size=128) # dev batch size can be a bit larger
dev_ppl = evaluate_ppl(model,
dev_data,
batch_size=train_batch_size *
2) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' %
(train_iter, dev_ppl),
file=sys.stderr)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' %
model_save_path,
file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(),
model_save_path + '.optim')
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(
args['--lr-decay'])
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
#params = torch.load(model_save_path, map_location=lambda storage, loc: storage)
# See https://github.com/pytorch/pytorch/issues/7415 and
# https://discuss.pytorch.org/t/on-a-cpu-device-how-to-load-checkpoint-saved-on-gpu-device/349 and
# https://github.com/pytorch/pytorch/issues/9139
params = torch.load(model_save_path,
map_location='cpu')
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
# optimizer.load_state_dict(torch.load(model_save_path + '.optim')
optimizer.load_state_dict(
torch.load(model_save_path + '.optim',
map_location='cpu'))
optimizer_to(optimizer, device)
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
exit(0)
def experiement(args: Dict, test_only, device):
""" Train and Test the NMT Model.
@param args (Dict): args from cmd line
"""
# train_data_src = read_corpus(args['--train-src'], source='src')
# train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
#
# dev_data_src = read_corpus(args['--dev-src'], source='src')
# dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
#
# train_data = list(zip(train_data_src, train_data_tgt))
# dev_data = list(zip(dev_data_src, dev_data_tgt))
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
use_pos_embed = False
if args['--use-pos-embed']:
use_pos_embed = True
use_copy = False
if args['--use-copy']:
use_copy = True
SRC, TRG, train_iterator, dev_iterator, test_iterator = load_data(
args['--train-data'], args['--dev-data'], args['--test-data'], device,
train_batch_size, (use_pos_embed or use_copy))
vocab = Vocab(SRC, TRG)
model = NMT(src_embed_size=int(args['--src-embed-size']),
dst_embed_size=int(args['--dst-embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=vocab,
use_pos_embed=use_pos_embed,
use_copy=use_copy)
model.load_pretrained_embeddings(vocab)
# print("args: {}".format(args))
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' %
(uniform_init, uniform_init),
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
# def init_weights(m):
# for name, param in m.named_parameters():
# if 'weight' in name:
# nn.init.normal_(param.data, mean=0, std=0.01)
# else:
# nn.init.constant_(param.data, 0)
#
# model.apply(init_weights)
# vocab_mask = torch.ones(len(vocab.tgt))
# vocab_mask[vocab.tgt['<pad>']] = 0
print('use device: %s' % device, file=sys.stderr)
print(model)
para_count = sum(p.numel() for p in model.parameters() if p.requires_grad)
print(f'The model has {para_count:,} trainable parameters')
print("file path: {}".format(model_save_path))
if test_only:
model.eval()
decode(args, test_iterator, vocab, device)
exit(0)
# perform training
model.train()
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
while True:
epoch += 1
#perform training
model.train()
# for src_sents, tgt_sents in batch_iter(train_data, batch_size=train_batch_size, shuffle=True):
for i, batch in enumerate(train_iterator):
train_iter += 1
optimizer.zero_grad()
src_sents, src_sents_lens = batch.src
tgt_sents = batch.trg
batch_size = src_sents.shape[1]
example_losses = -model(src_sents, src_sents_lens,
tgt_sents) # (batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
# if train_iter % log_every == 0:
# print("")
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter, report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
# model.eval()
# if train_iter % valid_niter == 0:
# print('epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d' % (epoch, train_iter,
# cum_loss / cum_examples,
# np.exp(cum_loss / cum_tgt_words),
# cum_examples), file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
# print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(
model, dev_iterator,
batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' % (train_iter, dev_ppl),
file=sys.stderr)
is_better = len(
hist_valid_scores) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
# print('save currently the best model to [%s]' % model_save_path, file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(), model_save_path + '.optim')
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
# exit(0)
break
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(
args['--lr-decay'])
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
params = torch.load(model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers', file=sys.stderr)
optimizer.load_state_dict(
torch.load(model_save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
break
# perform testing
model.eval()
decode(args, test_iterator, vocab, device)
def train(args: Dict):
""" Train the NMT Model.
:param Dict args: arguments from command line
"""
train_data_src = read_corpus(args['--train-src'], source='src')
train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
dev_data_src = read_corpus(args['--dev-src'], source='src')
dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
# Lists of (src_sent, tgt_sent) tuples
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
vocab = Vocab.load(args['--vocab'])
model = NMT(embed_size=int(args['--embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=vocab,
no_char_decoder=args['--no-char-decoder'])
model.train() # Set to train mode
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' %
(uniform_init, uniform_init),
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init) # Initialize in-place
# vocab_mask = torch.ones(len(vocab.tgt))
# vocab_mask[vocab.tgt['<pad>']] = 0
device = torch.device("cuda:0" if args['--cuda'] else "cpu")
print('use device: %s' % device, file=sys.stderr)
print('device name: ', torch.cuda.get_device_name(device))
print('device available: ', torch.cuda.is_available())
model = model.to(device) # Send model parameters to the chosen device
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
# Initialize necessary variables
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
# To keep track of previous scores
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
# Load the previous model parameters if they exist
if os.path.isfile('model.bin'):
print('Load previous best model...', file=sys.stderr)
# load model
params = torch.load(model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers', file=sys.stderr)
optimizer.load_state_dict(torch.load(model_save_path + '.optim'))
# save the loaded previous best model as current best - otherwise they will be overwritten
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=64) # dev batch size can be a bit larger
valid_metric = -dev_ppl
hist_valid_scores.append(valid_metric)
while True:
epoch += 1
# Iterate over lazily generated batches (lists) of sentences (each sentence is a list of words)
for src_sents, tgt_sents in batch_iter(train_data,
batch_size=train_batch_size,
shuffle=True):
train_iter += 1
# Zero gradients, otherwise they would be accumulated across batches
optimizer.zero_grad()
batch_size = len(src_sents)
# Calculate the losses for each example in the batch (i.e. forward propagation)
example_losses = -model(src_sents, tgt_sents) # Dim: (batch_size,)
# Average losses over the entire batch
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
# Compute gradients
loss.backward()
# Clip gradients
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
# Update parameters
optimizer.step()
# Get a number from a tensor containing a single scalar
batch_losses_val = batch_loss.item()
# Add to the ''report_loss'' (zeroed every ''log_every'' iterations - for logging)
report_loss += batch_losses_val
# Add to the ''cum_loss'' (zeroed every ''valid_niter'' iterations - for validation)
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# Perform validation
if train_iter % valid_niter == 0:
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=64) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' %
(train_iter, dev_ppl),
file=sys.stderr)
# Lower perplexity is better
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' %
model_save_path,
file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(),
model_save_path + '.optim')
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(
args['--lr-decay'])
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
params = torch.load(
model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
optimizer.load_state_dict(
torch.load(model_save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
exit(0)
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
train_data_src = read_corpus(args['--train-src'], source='src')
train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
dev_data_src = read_corpus(args['--dev-src'], source='src')
dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
#prefer to do our entire train,test,val split in the code itself as opposed to our previous script
# remove these comments
#data preprocessing for Qs and As.
spacy_en = spacy.load('en')
def tokenizer(text): # create a tokenizer function
return [tok.text for tok in spacy_en.tokenizer(text)]
TEXT = Field(sequential=True,
tokenize=tokenizer,
lower=True,
include_lengths=True,
init_token='<s>',
eos_token='</s>')
analogies_datafields = [("abc", TEXT), ("d", TEXT)]
train, val, test = TabularDataset.splits(
path="data", # the root directory where the data lies
train='ngram_train.csv',
validation="ngram_val.csv",
test='ngram_test.csv',
format='csv',
skip_header=
False, # if your csv header has a header, make sure to pass this to ensure it doesn't get proceesed as data!
fields=analogies_datafields)
pretrained_vecs = torchtext.vocab.Vectors('../GloVe-1.2/life_vectors.txt')
TEXT.build_vocab(
vectors=pretrained_vecs) # specials=['<pad>', '<s>', '</s>']
if args['--cuda'] == 'cpu':
torch_text_device = -1
else:
torch_text_device = 0
training_iter, val_iter, test_iter = Iterator.splits(
(train, val, test),
sort_key=lambda x: len(x.abc),
batch_sizes=(100, 20, 1),
device=torch_text_device,
sort_within_batch=True)
model = NMT(embed_size=int(args['--embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=TEXT.vocab)
model.train() #sets training = True
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' %
(uniform_init, uniform_init),
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
device = torch.device("cuda:0" if args['--cuda'] else "cpu")
print('use device: %s' % device, file=sys.stderr)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
writer = SummaryWriter('logs')
is_better_count = 0 #TODO: Remove this and debug the nonstopping part
while True:
epoch += 1
for _, data in enumerate(training_iter):
(src_sents, src_lengths), (tgt_sents, _) = data.abc, data.d
train_iter += 1
optimizer.zero_grad()
batch_size = src_sents.shape[1]
example_losses = model(src_sents, src_lengths,
tgt_sents) # (batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
writer.add_scalar('Train/AvgLoss',
report_loss / report_examples, epoch)
writer.add_scalar('Train/AvgPPL',
math.exp(report_loss / report_tgt_words),
epoch)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_niter == 0:
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl, val_loss = evaluate_ppl(
model, val_iter) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f, dev loss %f' %
(train_iter, dev_ppl, val_loss),
file=sys.stderr)
writer.add_scalar('Val/AvgPPL', dev_ppl, epoch)
writer.add_scalar('Val/AvgLoss', val_loss, epoch)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
print(hist_valid_scores)
print(valid_metric)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' %
model_save_path,
file=sys.stderr)
model.save(model_save_path)
is_better_count = is_better_count + 1
print(is_better_count)
# also save the optimizers' state
torch.save(optimizer.state_dict(),
model_save_path + '.optim')
if is_better_count > 3:
print('reached maximum number of epochs!',
file=sys.stderr)
writer.close()
exit(0)
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(
args['--lr-decay'])
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
params = torch.load(
model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
optimizer.load_state_dict(
torch.load(model_save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
writer.close()
exit(0)
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
train_data_src = read_corpus(args['--train-src'], source='src')
train_data_tgt = read_corpus(args['--train-tgt'], source='tgt')
dev_data_src = read_corpus(args['--dev-src'], source='src')
dev_data_tgt = read_corpus(args['--dev-tgt'], source='tgt')
train_data = list(zip(train_data_src, train_data_tgt))
dev_data = list(zip(dev_data_src, dev_data_tgt))
train_batch_size = int(args['--batch-size'])
clip_grad = float(args['--clip-grad'])
valid_niter = int(args['--valid-niter'])
log_every = int(args['--log-every'])
model_save_path = args['--save-to']
vocab = Vocab.load(args['--vocab'])
existing_model = args['--existing-model-path']
start_from_existing_model = existing_model and os.path.isfile(
existing_model)
if start_from_existing_model:
print("load model from {}".format(existing_model), file=sys.stderr)
model = NMT.load(existing_model,
no_char_decoder=args['--no-char-decoder'])
else:
print("Create a new model from hyper parameters")
model = NMT(embed_size=int(args['--embed-size']),
hidden_size=int(args['--hidden-size']),
dropout_rate=float(args['--dropout']),
vocab=vocab,
no_char_decoder=args['--no-char-decoder'])
model.train()
print_model_param_count(model)
# TODO: How to print all the parameters of this model? And is it useful?
if not start_from_existing_model:
uniform_init = float(args['--uniform-init'])
if np.abs(uniform_init) > 0.:
print('uniformly initialize parameters [-%f, +%f]' %
(uniform_init, uniform_init),
file=sys.stderr)
for p in model.parameters():
p.data.uniform_(-uniform_init, uniform_init)
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
device = torch.device("cuda:0" if args['--cuda'] else "cpu")
print('use device: %s' % device, file=sys.stderr)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=float(args['--lr']))
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
avg_train_ppls = []
avg_valid_ppls = []
# output_file_path = 'outputs/loss_%s' % datetime.datetime.now().strftime("%m-%d-%Y-%I:%M%p")
output_file_path = os.path.join(
args['--ppl-save-dir'],
'ppl.json') if args['--ppl-save-dir'] else 'ppl.json'
while True:
epoch += 1
for src_sents, tgt_sents in batch_iter(train_data,
batch_size=train_batch_size,
shuffle=True):
train_iter += 1
optimizer.zero_grad()
batch_size = len(src_sents)
example_losses = -model(src_sents, tgt_sents) # (batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
np.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
avg_train_ppls.append(np.exp(report_loss / report_tgt_words))
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_niter == 0:
# The printed values are the train loss
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=128) # dev batch size can be a bit larger
avg_valid_ppls.append(dev_ppl)
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' %
(train_iter, dev_ppl),
file=sys.stderr)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' %
model_save_path,
file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(),
model_save_path + '.optim')
elif patience < int(args['--patience']):
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == int(args['--patience']):
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == int(args['--max-num-trial']):
print('early stop!', file=sys.stderr)
output_losses(args, log_every, valid_niter,
avg_train_ppls, avg_valid_ppls,
output_file_path)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * float(
args['--lr-decay'])
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
params = torch.load(
model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
optimizer.load_state_dict(
torch.load(model_save_path + '.optim'))
# TODO: len(optimizer.param_groups) == 1 ? Or the below code seems odd
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
if epoch == int(args['--max-epoch']):
print('reached maximum number of epochs!', file=sys.stderr)
output_losses(args, log_every, valid_niter, avg_train_ppls,
avg_valid_ppls, output_file_path)
exit(0)
output_losses(args, log_every, valid_niter, avg_train_ppls,
avg_valid_ppls, output_file_path)
if args['--is-google-colab'] and epoch % 2 == 0 and os.path.isfile(
model_save_path):
shutil.copy(model_save_path, args['--ppl-save-dir'])
shutil.copy(model_save_path + '.optim', args['--ppl-save-dir'])
print("copied model files to google drive!")
def train(args: Dict):
""" Train the NMT Model.
@param args (Dict): args from cmd line
"""
sample_rate = 22000
resample_rate = 8000
train_records = 8
max_epoch = 10
vocab = Vocab.load('dataset/vocab_full.json')
# train_voices_files, corpus = get_voice_files_and_corpus('dataset/train/wavs', train_records)
# voices = load_voices_files(train_voices_files, sample_rate, resample_rate)
# train_data = list(zip(voices, corpus))
dev_files, dev_corpus = get_voice_files_and_corpus('dataset/dev', 2)
dev_data = list(
zip(load_voices_files(dev_files, sample_rate, resample_rate),
dev_corpus))
epoch_size = 4
train_batch_size = 2
clip_grad = 5.0
valid_niter = 100
log_every = 10
model_save_path = 'model.bin'
model = NMT(embed_size=1024, hidden_size=2048, vocab=vocab)
model.train()
vocab_mask = torch.ones(len(vocab.tgt))
vocab_mask[vocab.tgt['<pad>']] = 0
# device = torch.device("cuda:0")
device = torch.device("cpu")
print('use device: %s' % device, file=sys.stderr)
model = model.to(device)
optimizer = torch.optim.Adam(model.parameters(), lr=0.001)
num_trial = 0
train_iter = patience = cum_loss = report_loss = cum_tgt_words = report_tgt_words = 0
cum_examples = report_examples = epoch = valid_num = 0
hist_valid_scores = []
train_time = begin_time = time.time()
print('begin Maximum Likelihood training')
data_queue = Queue()
batch_queue = Queue(1)
loss_queue = Queue(2)
train_data_to_queue_process = Process(target=load_train_data,
args=('dataset/train', train_records,
epoch_size, data_queue))
train_data_to_queue_process.start()
batch_iter_to_queue_process = Process(target=batch_iter_to_queue2,
args=(data_queue, batch_queue,
loss_queue, max_epoch,
train_batch_size, True))
batch_iter_to_queue_process.start()
epoch, voices, tgt_sents = batch_queue.get(True)
current_epoch = -1
while voices is not None and tgt_sents is not None:
train_iter += 1
optimizer.zero_grad()
# voices = load_voices_files(voice_files, sample_rate, resample_rate)
# voices = voice_files
batch_size = len(voices)
example_losses = -model(voices, tgt_sents) # (batch_size,)
batch_loss = example_losses.sum()
loss = batch_loss / batch_size
loss.backward()
# clip gradient
grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(),
clip_grad)
optimizer.step()
batch_losses_val = batch_loss.item()
report_loss += batch_losses_val
cum_loss += batch_losses_val
tgt_words_num_to_predict = sum(
len(s[1:]) for s in tgt_sents) # omitting leading `<s>`
report_tgt_words += tgt_words_num_to_predict
cum_tgt_words += tgt_words_num_to_predict
report_examples += batch_size
cum_examples += batch_size
loss_queue.put(report_loss / report_examples)
if train_iter % log_every == 0:
print('epoch %d, iter %d, avg. loss %.2f, avg. ppl %.2f ' \
'cum. examples %d, speed %.2f words/sec, time elapsed %.2f sec' % (epoch, train_iter,
report_loss / report_examples,
math.exp(report_loss / report_tgt_words),
cum_examples,
report_tgt_words / (time.time() - train_time),
time.time() - begin_time), file=sys.stderr)
train_time = time.time()
report_loss = report_tgt_words = report_examples = 0.
# perform validation
if train_iter % valid_niter == 0:
print(
'epoch %d, iter %d, cum. loss %.2f, cum. ppl %.2f cum. examples %d'
% (epoch, train_iter, cum_loss / cum_examples,
np.exp(cum_loss / cum_tgt_words), cum_examples),
file=sys.stderr)
cum_loss = cum_examples = cum_tgt_words = 0.
valid_num += 1
print('begin validation ...', file=sys.stderr)
# compute dev. ppl and bleu
dev_ppl = evaluate_ppl(
model, dev_data,
batch_size=128) # dev batch size can be a bit larger
valid_metric = -dev_ppl
print('validation: iter %d, dev. ppl %f' % (train_iter, dev_ppl),
file=sys.stderr)
is_better = len(hist_valid_scores
) == 0 or valid_metric > max(hist_valid_scores)
hist_valid_scores.append(valid_metric)
if is_better:
patience = 0
print('save currently the best model to [%s]' %
model_save_path,
file=sys.stderr)
model.save(model_save_path)
# also save the optimizers' state
torch.save(optimizer.state_dict(), model_save_path + '.optim')
elif patience < 10:
patience += 1
print('hit patience %d' % patience, file=sys.stderr)
if patience == 5:
num_trial += 1
print('hit #%d trial' % num_trial, file=sys.stderr)
if num_trial == 3:
print('early stop!', file=sys.stderr)
exit(0)
# decay lr, and restore from previously best checkpoint
lr = optimizer.param_groups[0]['lr'] * 0.5
print(
'load previously best model and decay learning rate to %f'
% lr,
file=sys.stderr)
# load model
params = torch.load(
model_save_path,
map_location=lambda storage, loc: storage)
model.load_state_dict(params['state_dict'])
model = model.to(device)
print('restore parameters of the optimizers',
file=sys.stderr)
optimizer.load_state_dict(
torch.load(model_save_path + '.optim'))
# set new lr
for param_group in optimizer.param_groups:
param_group['lr'] = lr
# reset patience
patience = 0
epoch, voices, tgt_sents = batch_queue.get()
batch_iter_to_queue_process.join()
train_data_to_queue_process.join()
