def main(path_to_data: str,
cache_dir: str,
texts_col: str,
labels_col: str,
n_classes: int,
batch_size: int,
batch_size_eval: int,
min_lr: int,
max_lr: int,
n_epochs: int,
cuda: int = 0):
'''
'''
df = pd.read_csv(path_to_data)
if os.path.isdir(cache_dir):
logger.info('Cache dir found here {}'.format(cache_dir))
pass
else:
logger.info('Creating cache dir')
os.mkdir(cache_dir)
# Preprocess
optimal_length = get_length(df, texts_col)
X, vocab_size = encode_texts(df,
texts_col,
max_seq_length=optimal_length,
return_vocab_size=True)
y = get_labels(df, labels_col, n_classes)
train_loader, test_loader = create_TorchLoaders(
X,
y,
test_size=0.10,
batch_size=batch_size,
batch_size_eval=batch_size_eval)
Model = LSTMModel(vocab_size=vocab_size, n_classes=n_classes)
config_dict = {
"vocab_size": vocab_size,
"n_classes": n_classes,
"max_length": optimal_length
}
if n_classes > 2:
criterion = torch.nn.CrossEntropyLoss()
else:
criterion = torch.nn.BCEWithLogitsLoss()
optim = torch.optim.Adam(Model.parameters())
## Heuristic
opt_cycle = ((((len(X) * (1 - 0.10)) / batch_size) * n_epochs) * 0.25) / 2
schedul = torch.optim.lr_scheduler.CyclicLR(optim,
min_lr,
max_lr,
step_size_up=opt_cycle,
step_size_down=opt_cycle,
mode="exp_range",
cycle_momentum=False,
gamma=0.999)
if cuda == 1:
Model.cuda()
device = "cuda"
else:
device = "cpu"
metrics = {
"training_loss": [],
"eval_loss": [],
"training_f1": [],
"eval_f1": []
}
logger.info("Starting training for {} epochs".format(n_epochs))
for epoch in range(n_epochs):
Model.train()
progress = progressbar.ProgressBar()
for batch in progress(train_loader):
batch = tuple(t for t in batch)
inputs, labels = batch #unpacking
inputs = inputs.to(device, dtype=torch.long)
labels = labels.to(device, dtype=torch.float)
preds = Model(inputs)
loss = criterion(preds, labels)
## Metrics computation
metrics["training_loss"].append(loss.item())
preds = preds.to("cpu").detach().numpy()
preds = flat_pred(preds, 0.5)
tmp_f1 = f1_score(labels.to("cpu").detach().numpy(),
preds,
average='macro')
metrics["training_f1"].append(tmp_f1)
## Backward pass ##
loss.backward()
optim.step() #Gradient descent
schedul.step()
Model.zero_grad()
logger.info(
"Epoch {} done with: training loss: {}\n training f1: {}".format(
epoch, loss.item(), tmp_f1))
## Eval
progress = progressbar.ProgressBar()
Model.eval()
for batch in progress(test_loader):
with torch.no_grad(): #computationaly efficient
batch = tuple(t for t in batch)
inputs, labels = batch
inputs = inputs.to(device, dtype=torch.long)
labels = labels.to(device, dtype=torch.float)
preds = Model(inputs)
eval_loss = criterion(preds, labels)
## Eval metrics
metrics["eval_loss"].append(eval_loss.item())
preds = preds.to("cpu").detach().numpy()
preds = flat_pred(preds, 0.5)
tmp_f1 = f1_score(labels.to("cpu").detach().numpy(),
preds,
average='macro') ## detach
metrics["eval_f1"].append(tmp_f1)
logger.info(
"Evaluation at iteration {} done: eval loss: {}\n eval f1: {}".
format(epoch, eval_loss.item(), tmp_f1))
## Bring back model to cpu
Model.cpu()
## Get/Save param dict
logger.info('Saving model in cache dir {}'.format(cache_dir))
torch.save(Model.state_dict(), os.path.join(cache_dir, 'state_dict.pt'))
with open(os.path.join(cache_dir, 'config_model.json'), 'w') as file:
json.dump(config_dict, file)
def main(args):
use_cuda = (len(args.gpuid) >= 1)
if args.gpuid:
cuda.set_device(args.gpuid[0])
# Load dataset
splits = ['train', 'valid']
if data.has_binary_files(args.data, splits):
dataset = data.load_dataset(args.data, splits, args.src_lang,
args.trg_lang)
else:
dataset = data.load_raw_text_dataset(args.data, splits, args.src_lang,
args.trg_lang)
if args.src_lang is None or args.trg_lang is None:
# record inferred languages in args, so that it's saved in checkpoints
args.src_lang, args.trg_lang = dataset.src, dataset.dst
print('| [{}] dictionary: {} types'.format(dataset.src,
len(dataset.src_dict)))
print('| [{}] dictionary: {} types'.format(dataset.dst,
len(dataset.dst_dict)))
for split in splits:
print('| {} {} {} examples'.format(args.data, split,
len(dataset.splits[split])))
# Set model parameters
args.encoder_embed_dim = 1000
args.encoder_layers = 4
args.encoder_dropout_out = 0
args.decoder_embed_dim = 1000
args.decoder_layers = 4
args.decoder_out_embed_dim = 1000
args.decoder_dropout_out = 0
args.bidirectional = False
logging_meters = OrderedDict()
logging_meters['train_loss'] = AverageMeter()
logging_meters['valid_loss'] = AverageMeter()
logging_meters['bsz'] = AverageMeter() # sentences per batch
# Build model
generator = LSTMModel(args,
dataset.src_dict,
dataset.dst_dict,
use_cuda=use_cuda)
if use_cuda:
generator.cuda()
else:
generator.cpu()
optimizer = eval("torch.optim." + args.optimizer)(generator.parameters(),
args.learning_rate)
lr_scheduler = torch.optim.lr_scheduler.ReduceLROnPlateau(
optimizer, patience=0, factor=args.lr_shrink)
# Train until the learning rate gets too small
max_epoch = args.max_epoch or math.inf
epoch_i = 1
best_dev_loss = math.inf
lr = optimizer.param_groups[0]['lr']
# main training loop
# added for write training loss
f1 = open("train_loss", "a")
while lr > args.min_lr and epoch_i <= max_epoch:
logging.info("At {0}-th epoch.".format(epoch_i))
seed = args.seed + epoch_i
torch.manual_seed(seed)
max_positions_train = (min(args.max_source_positions,
generator.encoder.max_positions()),
min(args.max_target_positions,
generator.decoder.max_positions()))
# Initialize dataloader, starting at batch_offset
itr = dataset.train_dataloader(
'train',
max_tokens=args.max_tokens,
max_sentences=args.max_sentences,
max_positions=max_positions_train,
seed=seed,
epoch=epoch_i,
sample_without_replacement=args.sample_without_replacement,
sort_by_source_size=(epoch_i <= args.curriculum),
shard_id=args.distributed_rank,
num_shards=args.distributed_world_size,
)
# set training mode
generator.train()
# reset meters
for key, val in logging_meters.items():
if val is not None:
val.reset()
for i, sample in enumerate(itr):
if use_cuda:
# wrap input tensors in cuda tensors
sample = utils.make_variable(sample, cuda=cuda)
loss = generator(sample)
sample_size = sample['target'].size(
0) if args.sentence_avg else sample['ntokens']
nsentences = sample['target'].size(0)
logging_loss = loss.data / sample_size / math.log(2)
logging_meters['bsz'].update(nsentences)
logging_meters['train_loss'].update(logging_loss, sample_size)
f1.write("{0}\n".format(logging_meters['train_loss'].avg))
logging.debug(
"loss at batch {0}: {1:.3f}, batch size: {2}, lr={3}".format(
i, logging_meters['train_loss'].avg,
round(logging_meters['bsz'].avg),
optimizer.param_groups[0]['lr']))
optimizer.zero_grad()
loss.backward()
# all-reduce grads and rescale by grad_denom
for p in generator.parameters():
if p.requires_grad:
p.grad.data.div_(sample_size)
torch.nn.utils.clip_grad_norm(generator.parameters(),
args.clip_norm)
optimizer.step()
# validation -- this is a crude estimation because there might be some padding at the end
max_positions_valid = (
generator.encoder.max_positions(),
generator.decoder.max_positions(),
)
# Initialize dataloader
itr = dataset.eval_dataloader(
'valid',
max_tokens=args.max_tokens,
max_sentences=args.max_sentences,
max_positions=max_positions_valid,
skip_invalid_size_inputs_valid_test=args.
skip_invalid_size_inputs_valid_test,
descending=True, # largest batch first to warm the caching allocator
shard_id=args.distributed_rank,
num_shards=args.distributed_world_size,
)
# set validation mode
generator.eval()
# reset meters
for key, val in logging_meters.items():
if val is not None:
val.reset()
for i, sample in enumerate(itr):
with torch.no_grad():
if use_cuda:
# wrap input tensors in cuda tensors
sample = utils.make_variable(sample, cuda=cuda)
loss = generator(sample)
sample_size = sample['target'].size(
0) if args.sentence_avg else sample['ntokens']
loss = loss / sample_size / math.log(2)
logging_meters['valid_loss'].update(loss, sample_size)
logging.debug("dev loss at batch {0}: {1:.3f}".format(
i, logging_meters['valid_loss'].avg))
# update learning rate
lr_scheduler.step(logging_meters['valid_loss'].avg)
lr = optimizer.param_groups[0]['lr']
logging.info(
"Average loss value per instance is {0} at the end of epoch {1}".
format(logging_meters['valid_loss'].avg, epoch_i))
torch.save(
generator.state_dict(),
open(
args.model_file + "data.nll_{0:.3f}.epoch_{1}.pt".format(
logging_meters['valid_loss'].avg, epoch_i), 'wb'))
if logging_meters['valid_loss'].avg < best_dev_loss:
best_dev_loss = logging_meters['valid_loss'].avg
torch.save(generator.state_dict(),
open(args.model_file + "best_gmodel.pt", 'wb'))
epoch_i += 1
f1.close()