class Trainer(object):
"""Trainer"""
def __init__(self, args):
super(Trainer, self).__init__()
self.config = configurations.get_config(
args.proto, getattr(configurations, args.proto),
args.config_overrides)
self.num_preload = args.num_preload
self.lr = self.config['lr']
ut.remove_files_in_dir(self.config['save_to'])
self.logger = ut.get_logger(self.config['log_file'])
self.train_smooth_perps = []
self.train_true_perps = []
# For logging
self.log_freq = self.config[
'log_freq'] # log train stat every this-many batches
self.log_train_loss = []
self.log_nll_loss = []
self.log_train_weights = []
self.log_grad_norms = []
self.total_batches = 0 # number of batches done for the whole training
self.epoch_loss = 0. # total train loss for whole epoch
self.epoch_nll_loss = 0. # total train loss for whole epoch
self.epoch_weights = 0. # total train weights (# target words) for whole epoch
self.epoch_time = 0. # total exec time for whole epoch, sounds like that tabloid
# get model
device = ut.get_device()
self.model = Model(self.config).to(device)
self.validator = Validator(self.config, self.model)
self.validate_freq = self.config['validate_freq']
if self.validate_freq == 1:
self.logger.info('Evaluate every ' + (
'epoch' if self.config['val_per_epoch'] else 'batch'))
else:
self.logger.info(f'Evaluate every {self.validate_freq:,} ' + (
'epochs' if self.config['val_per_epoch'] else 'batches'))
# Estimated number of batches per epoch
self.est_batches = max(self.model.data_manager.training_tok_counts
) // self.config['batch_size']
self.logger.info(
f'Guessing around {self.est_batches:,} batches per epoch')
param_count = sum(
[numpy.prod(p.size()) for p in self.model.parameters()])
self.logger.info(f'Model has {int(param_count):,} parameters')
# Set up parameter-specific options
params = []
for p in self.model.parameters():
ptr = p.data_ptr()
d = {'params': [p]}
if ptr in self.model.parameter_attrs:
attrs = self.model.parameter_attrs[ptr]
for k in attrs:
d[k] = attrs[k]
params.append(d)
self.optimizer = torch.optim.Adam(params,
lr=self.lr,
betas=(self.config['beta1'],
self.config['beta2']),
eps=self.config['epsilon'])
def report_epoch(self, epoch, batches):
self.logger.info(f'Finished epoch {epoch}')
self.logger.info(f' Took {ut.format_time(self.epoch_time)}')
self.logger.info(
f' avg words/sec {self.epoch_weights / self.epoch_time:.2f}')
self.logger.info(f' avg sec/batch {self.epoch_time / batches:.2f}')
self.logger.info(f' {batches} batches')
if self.epoch_weights:
train_smooth_perp = self.epoch_loss / self.epoch_weights
train_true_perp = self.epoch_nll_loss / self.epoch_weights
else:
train_smooth_perp = float('inf')
train_true_perp = float('inf')
self.est_batches = batches
self.epoch_time = 0.
self.epoch_nll_loss = 0.
self.epoch_loss = 0.
self.epoch_weights = 0.
self.log_train_loss = []
self.log_nll_loss = []
self.log_train_weights = []
self.log_grad_norms = []
train_smooth_perp = numpy.exp(
train_smooth_perp) if train_smooth_perp < 300 else float('inf')
self.train_smooth_perps.append(train_smooth_perp)
train_true_perp = numpy.exp(
train_true_perp) if train_true_perp < 300 else float('inf')
self.train_true_perps.append(train_true_perp)
self.logger.info(
f' smooth, true perp: {float(train_smooth_perp):.2f}, {float(train_true_perp):.2f}'
)
def clip_grad_values(self):
"""
Adapted from https://pytorch.org/docs/stable/_modules/torch/nn/utils/clip_grad.html#clip_grad_value_
This is the same as torch.nn.utils.clip_grad_value_, except is also sets nan gradients to 0.0
"""
parameters = self.model.parameters()
clip_value = float(self.config['grad_clamp'])
if isinstance(parameters, torch.Tensor):
parameters = [parameters]
for p in filter(lambda p: p.grad is not None, parameters):
p.grad.data.clamp_(min=-clip_value, max=clip_value)
p.grad.data[torch.isnan(p.grad.data)] = 0.0
def get_params(self, pe=False):
for n, p in self.model.named_parameters():
if (n in self.model.struct_params) == pe:
yield p
def run_log(self, batch, epoch, batch_data):
#with torch.autograd.detect_anomaly(): # throws exception when any forward computation produces nan
start = time.time()
_, src_toks, src_structs, trg_toks, targets = batch_data
# zero grad
self.optimizer.zero_grad()
# get loss
ret = self.model(src_toks, src_structs, trg_toks, targets, batch,
epoch)
loss = ret['loss']
nll_loss = ret['nll_loss']
if self.config['normalize_loss'] == ac.LOSS_TOK:
opt_loss = loss / (targets != ac.PAD_ID).sum()
elif self.config['normalize_loss'] == ac.LOSS_BATCH:
opt_loss = loss / targets.size()[0]
else:
opt_loss = loss
opt_loss.backward()
# clip gradient
if self.config['grad_clamp']: self.clip_grad_values()
if self.config['grad_clip_pe']:
pms = list(self.get_params(True))
if pms:
torch.nn.utils.clip_grad_norm_(pms,
self.config['grad_clip_pe'])
pms = self.get_params()
else:
pms = self.model.parameters()
grad_norm = torch.nn.utils.clip_grad_norm_(
self.model.parameters(), self.config['grad_clip']).detach()
# update
self.adjust_lr()
self.optimizer.step()
# update training stats
num_words = (targets != ac.PAD_ID).detach().sum()
loss = loss.detach()
nll_loss = nll_loss.detach()
self.total_batches += 1
self.log_train_loss.append(loss)
self.log_nll_loss.append(nll_loss)
self.log_train_weights.append(num_words)
self.log_grad_norms.append(grad_norm)
self.epoch_time += time.time() - start
if self.total_batches % self.log_freq == 0:
log_train_loss = torch.tensor(0.0)
log_nll_loss = torch.tensor(0.0)
log_train_weights = torch.tensor(0.0)
log_all_weights = torch.tensor(0.0)
for smooth, nll, weight in zip(self.log_train_loss,
self.log_nll_loss,
self.log_train_weights):
if not self.config['grad_clamp'] or (torch.isfinite(smooth)
and torch.isfinite(nll)):
log_train_loss += smooth
log_nll_loss += nll
log_train_weights += weight
log_all_weights += weight
#log_train_loss = sum(x for x in self.log_train_loss).item()
#log_nll_loss = sum(x for x in self.log_nll_loss).item()
#log_train_weights = sum(x for x in self.log_train_weights).item()
avg_smooth_perp = log_train_loss / log_train_weights
avg_smooth_perp = numpy.exp(
avg_smooth_perp) if avg_smooth_perp < 300 else float('inf')
avg_true_perp = log_nll_loss / log_train_weights
avg_true_perp = numpy.exp(
avg_true_perp) if avg_true_perp < 300 else float('inf')
self.epoch_loss += log_train_loss
self.epoch_nll_loss += log_nll_loss
self.epoch_weights += log_all_weights
acc_speed_word = self.epoch_weights / self.epoch_time
acc_speed_time = self.epoch_time / batch
avg_grad_norm = sum(self.log_grad_norms) / len(self.log_grad_norms)
#median_grad_norm = sorted(self.log_grad_norms)[len(self.log_grad_norms)//2]
est_percent = int(100 * batch / self.est_batches)
epoch_len = max(5, ut.get_num_digits(self.config['max_epochs']))
batch_len = max(5, ut.get_num_digits(self.est_batches))
if batch > self.est_batches: remaining = '?'
else:
remaining = ut.format_time(acc_speed_time *
(self.est_batches - batch))
self.log_train_loss = []
self.log_nll_loss = []
self.log_train_weights = []
self.log_grad_norms = []
cells = [
f'{epoch:{epoch_len}}', f'{batch:{batch_len}}',
f'{est_percent:3}%', f'{remaining:>9}',
f'{acc_speed_word:#10.4g}', f'{acc_speed_time:#6.4g}s',
f'{avg_smooth_perp:#11.4g}', f'{avg_true_perp:#9.4g}',
f'{avg_grad_norm:#9.4g}'
]
self.logger.info(' '.join(cells))
def adjust_lr(self):
if self.config['warmup_style'] == ac.ORG_WARMUP:
step = self.total_batches + 1.0
if step < self.config['warmup_steps']:
lr = self.config['embed_dim']**(
-0.5) * step * self.config['warmup_steps']**(-1.5)
else:
lr = max(self.config['embed_dim']**(-0.5) * step**(-0.5),
self.config['min_lr'])
for p in self.optimizer.param_groups:
p['lr'] = lr
elif self.config['warmup_style'] == ac.FIXED_WARMUP:
warmup_steps = self.config['warmup_steps']
step = self.total_batches + 1.0
start_lr = self.config['start_lr']
peak_lr = self.config['lr']
min_lr = self.config['min_lr']
if step < warmup_steps:
lr = start_lr + (peak_lr - start_lr) * step / warmup_steps
else:
lr = max(min_lr, peak_lr * warmup_steps**(0.5) * step**(-0.5))
for p in self.optimizer.param_groups:
p['lr'] = lr
elif self.config['warmup_style'] == ac.UPFLAT_WARMUP:
warmup_steps = self.config['warmup_steps']
step = self.total_batches + 1.0
start_lr = self.config['start_lr']
peak_lr = self.config['lr']
min_lr = self.config['min_lr']
if step < warmup_steps:
lr = start_lr + (peak_lr - start_lr) * step / warmup_steps
for p in self.optimizer.param_groups:
p['lr'] = lr
else:
pass
def train(self):
self.model.train()
stop_early = False
early_stop_msg_num = self.config[
'early_stop_patience'] * self.validate_freq
early_stop_msg_metric = 'epochs' if self.config[
'val_by_bleu'] else 'batches'
early_stop_msg = f'No improvement for last {early_stop_msg_num} {early_stop_msg_metric}; stopping early!'
for epoch in range(1, self.config['max_epochs'] + 1):
batch = 0
for batch_data in self.model.data_manager.get_batches(
mode=ac.TRAINING, num_preload=self.num_preload):
if batch == 0:
self.logger.info(f'Begin epoch {epoch}')
epoch_str = ' ' * max(
0,
ut.get_num_digits(self.config['max_epochs']) -
5) + 'epoch'
batch_str = ' ' * max(
0,
ut.get_num_digits(self.est_batches) - 5) + 'batch'
self.logger.info(' '.join([
epoch_str, batch_str, 'est%', 'remaining',
'trg word/s', 's/batch', 'smooth perp', 'true perp',
'grad norm'
]))
batch += 1
self.run_log(batch, epoch, batch_data)
if not self.config['val_per_epoch']:
stop_early = self.maybe_validate()
if stop_early:
self.logger.info(early_stop_msg)
break
if stop_early:
break
self.report_epoch(epoch, batch)
if self.config['val_per_epoch'] and epoch % self.validate_freq == 0:
stop_early = self.maybe_validate(just_validate=True)
if stop_early:
self.logger.info(early_stop_msg)
break
if not self.config['val_by_bleu'] and not stop_early:
# validate 1 last time
self.maybe_validate(just_validate=True)
self.logger.info('Training finished')
self.logger.info('Train smooth perps:')
self.logger.info(', '.join(
[f'{x:.2f}' for x in self.train_smooth_perps]))
self.logger.info('Train true perps:')
self.logger.info(', '.join([f'{x:.2f}'
for x in self.train_true_perps]))
numpy.save(
os.path.join(self.config['save_to'], 'train_smooth_perps.npy'),
self.train_smooth_perps)
numpy.save(
os.path.join(self.config['save_to'], 'train_true_perps.npy'),
self.train_true_perps)
self.model.save()
# Evaluate test
test_file = self.model.data_manager.data_files[ac.TESTING][
self.model.data_manager.src_lang]
dev_file = self.model.data_manager.data_files[ac.VALIDATING][
self.model.data_manager.src_lang]
if os.path.exists(test_file):
self.logger.info('Evaluate test')
self.restart_to_best_checkpoint()
self.model.save()
self.validator.translate(test_file, to_ids=True)
self.logger.info('Translate dev set')
self.validator.translate(dev_file, to_ids=True)
def restart_to_best_checkpoint(self):
if self.config['val_by_bleu']:
best_bleu = numpy.max(self.validator.best_bleus)
best_cpkt_path = self.validator.get_cpkt_path(best_bleu)
else:
best_perp = numpy.min(self.validator.best_perps)
best_cpkt_path = self.validator.get_cpkt_path(best_perp)
self.logger.info(f'Restore best cpkt from {best_cpkt_path}')
self.model.load_state_dict(torch.load(best_cpkt_path))
def is_patience_exhausted(self, patience, if_worst=False):
'''
if_worst=False (default) -> check if last patience epochs have failed to improve dev score
if_worst=True -> check if last epoch was WORSE than the patience epochs before it
'''
curve = self.validator.bleu_curve if self.config[
'val_by_bleu'] else self.validator.perp_curve
best_worse = max if self.config['val_by_bleu'] is not if_worst else min
return patience and len(
curve) > patience and curve[-1 if if_worst else -1 -
patience] == best_worse(
curve[-1 - patience:])
def maybe_validate(self, just_validate=False):
if self.total_batches % self.validate_freq == 0 or just_validate:
self.model.save()
self.validator.validate_and_save()
# if doing annealing
step = self.total_batches + 1.0
warmup_steps = self.config['warmup_steps']
if self.config['warmup_style'] == ac.NO_WARMUP \
or (self.config['warmup_style'] == ac.UPFLAT_WARMUP and step >= warmup_steps) \
and self.config['lr_decay'] > 0:
if self.is_patience_exhausted(self.config['lr_decay_patience'],
if_worst=True):
if self.config['val_by_bleu']:
metric = 'bleu'
scores = self.validator.bleu_curve
else:
metric = 'perp'
scores = self.validator.perp_curve
scores = ', '.join([
str(x)
for x in scores[-1 - self.config['lr_decay_patience']:]
])
self.logger.info(f'Past {metric} scores are {scores}')
# when don't use warmup, decay lr if dev not improve
if self.lr * self.config['lr_decay'] >= self.config[
'min_lr']:
new_lr = self.lr * self.config['lr_decay']
self.logger.info(
f'Anneal the learning rate from {self.lr} to {new_lr}'
)
self.lr = new_lr
for p in self.optimizer.param_groups:
p['lr'] = self.lr
return self.is_patience_exhausted(self.config['early_stop_patience'])
def __init__(self, model: Model, config: dict) -> None:
"""
Creates a new TrainManager for a model, specified as in configuration.
:param model: torch module defining the model
:param config: dictionary containing the training configurations
"""
train_config = config["training"]
# files for logging and storing
self.model_dir = make_model_dir(train_config["model_dir"],
overwrite=train_config.get(
"overwrite", False))
self.logger = make_logger(model_dir=self.model_dir)
self.logging_freq = train_config.get("logging_freq", 100)
self.valid_report_file = "{}/validations.txt".format(self.model_dir)
self.tb_writer = SummaryWriter(log_dir=self.model_dir +
"/tensorboard/")
# model
self.model = model
self.pad_index = self.model.pad_index
self.bos_index = self.model.bos_index
self._log_parameters_list()
# objective
self.label_smoothing = train_config.get("label_smoothing", 0.0)
self.loss = XentLoss(pad_index=self.pad_index,
smoothing=self.label_smoothing)
self.normalization = train_config.get("normalization", "batch")
if self.normalization not in ["batch", "tokens"]:
raise ConfigurationError("Invalid normalization. "
"Valid options: 'batch', 'tokens'.")
# optimization
self.learning_rate_min = train_config.get("learning_rate_min", 1.0e-8)
self.clip_grad_fun = build_gradient_clipper(config=train_config)
self.optimizer = build_optimizer(config=train_config,
parameters=model.parameters())
# validation & early stopping
self.validation_freq = train_config.get("validation_freq", 1000)
self.log_valid_sents = train_config.get("print_valid_sents", [0, 1, 2])
self.ckpt_queue = queue.Queue(
maxsize=train_config.get("keep_last_ckpts", 5))
self.eval_metric = train_config.get("eval_metric", "bleu")
if self.eval_metric not in ['bleu', 'chrf']:
raise ConfigurationError("Invalid setting for 'eval_metric', "
"valid options: 'bleu', 'chrf'.")
self.early_stopping_metric = train_config.get("early_stopping_metric",
"eval_metric")
# if we schedule after BLEU/chrf, we want to maximize it, else minimize
# early_stopping_metric decides on how to find the early stopping point:
# ckpts are written when there's a new high/low score for this metric
if self.early_stopping_metric in ["ppl", "loss"]:
self.minimize_metric = True
elif self.early_stopping_metric == "eval_metric":
if self.eval_metric in ["bleu", "chrf"]:
self.minimize_metric = False
else: # eval metric that has to get minimized (not yet implemented)
self.minimize_metric = True
else:
raise ConfigurationError(
"Invalid setting for 'early_stopping_metric', "
"valid options: 'loss', 'ppl', 'eval_metric'.")
# learning rate scheduling
self.scheduler, self.scheduler_step_at = build_scheduler(
config=train_config,
scheduler_mode="min" if self.minimize_metric else "max",
optimizer=self.optimizer,
hidden_size=config["model"]["encoder"]["hidden_size"])
# data & batch handling
self.level = config["data"]["level"]
if self.level not in ["word", "bpe", "char"]:
raise ConfigurationError("Invalid segmentation level. "
"Valid options: 'word', 'bpe', 'char'.")
self.shuffle = train_config.get("shuffle", True)
self.epochs = train_config["epochs"]
self.batch_size = train_config["batch_size"]
self.batch_type = train_config.get("batch_type", "sentence")
self.eval_batch_size = train_config.get("eval_batch_size",
self.batch_size)
self.eval_batch_type = train_config.get("eval_batch_type",
self.batch_type)
self.batch_multiplier = train_config.get("batch_multiplier", 1)
# generation
self.max_output_length = train_config.get("max_output_length", None)
# CPU / GPU
self.use_cuda = train_config["use_cuda"]
if self.use_cuda:
self.model.cuda()
self.loss.cuda()
# initialize training statistics
self.steps = 0
# stop training if this flag is True by reaching learning rate minimum
self.stop = False
self.total_tokens = 0
self.best_ckpt_iteration = 0
# initial values for best scores
self.best_ckpt_score = np.inf if self.minimize_metric else -np.inf
# comparison function for scores
self.is_best = lambda score: score < self.best_ckpt_score \
if self.minimize_metric else score > self.best_ckpt_score
# model parameters
if "load_model" in train_config.keys():
model_load_path = train_config["load_model"]
self.logger.info("Loading model from %s", model_load_path)
self.init_from_checkpoint(model_load_path)
class Trainer(object):
"""Trainer"""
def __init__(self, args):
super(Trainer, self).__init__()
self.config = getattr(configurations, args.proto)()
self.num_preload = args.num_preload
self.logger = ut.get_logger(self.config['log_file'])
self.device = torch.device(
'cuda:0' if torch.cuda.is_available() else 'cpu')
self.normalize_loss = self.config['normalize_loss']
self.patience = self.config['patience']
self.lr = self.config['lr']
self.lr_decay = self.config['lr_decay']
self.max_epochs = self.config['max_epochs']
self.warmup_steps = self.config['warmup_steps']
self.train_smooth_perps = []
self.train_true_perps = []
self.data_manager = DataManager(self.config)
self.validator = Validator(self.config, self.data_manager)
self.val_per_epoch = self.config['val_per_epoch']
self.validate_freq = int(self.config['validate_freq'])
self.logger.info('Evaluate every {} {}'.format(
self.validate_freq, 'epochs' if self.val_per_epoch else 'batches'))
# For logging
self.log_freq = 100 # log train stat every this-many batches
self.log_train_loss = 0. # total train loss every log_freq batches
self.log_nll_loss = 0.
self.log_train_weights = 0.
self.num_batches_done = 0 # number of batches done for the whole training
self.epoch_batches_done = 0 # number of batches done for this epoch
self.epoch_loss = 0. # total train loss for whole epoch
self.epoch_nll_loss = 0. # total train loss for whole epoch
self.epoch_weights = 0. # total train weights (# target words) for whole epoch
self.epoch_time = 0. # total exec time for whole epoch, sounds like that tabloid
# get model
self.model = Model(self.config).to(self.device)
param_count = sum(
[numpy.prod(p.size()) for p in self.model.parameters()])
self.logger.info('Model has {:,} parameters'.format(param_count))
# get optimizer
beta1 = self.config['beta1']
beta2 = self.config['beta2']
epsilon = self.config['epsilon']
self.optimizer = torch.optim.Adam(self.model.parameters(),
lr=self.lr,
betas=(beta1, beta2),
eps=epsilon)
def report_epoch(self, e):
self.logger.info('Finish epoch {}'.format(e))
self.logger.info(' It takes {}'.format(
ut.format_seconds(self.epoch_time)))
self.logger.info(' Avergage # words/second {}'.format(
self.epoch_weights / self.epoch_time))
self.logger.info(' Average seconds/batch {}'.format(
self.epoch_time / self.epoch_batches_done))
train_smooth_perp = self.epoch_loss / self.epoch_weights
train_true_perp = self.epoch_nll_loss / self.epoch_weights
self.epoch_batches_done = 0
self.epoch_time = 0.
self.epoch_nll_loss = 0.
self.epoch_loss = 0.
self.epoch_weights = 0.
train_smooth_perp = numpy.exp(
train_smooth_perp) if train_smooth_perp < 300 else float('inf')
self.train_smooth_perps.append(train_smooth_perp)
train_true_perp = numpy.exp(
train_true_perp) if train_true_perp < 300 else float('inf')
self.train_true_perps.append(train_true_perp)
self.logger.info(
' smoothed train perplexity: {}'.format(train_smooth_perp))
self.logger.info(
' true train perplexity: {}'.format(train_true_perp))
def run_log(self, b, e, batch_data):
start = time.time()
src_toks, trg_toks, targets = batch_data
src_toks_cuda = src_toks.to(self.device)
trg_toks_cuda = trg_toks.to(self.device)
targets_cuda = targets.to(self.device)
# zero grad
self.optimizer.zero_grad()
# get loss
ret = self.model(src_toks_cuda, trg_toks_cuda, targets_cuda)
loss = ret['loss']
nll_loss = ret['nll_loss']
if self.normalize_loss == ac.LOSS_TOK:
opt_loss = loss / (targets_cuda != ac.PAD_ID).type(
loss.type()).sum()
elif self.normalize_loss == ac.LOSS_BATCH:
opt_loss = loss / targets_cuda.size()[0].type(loss.type())
else:
opt_loss = loss
opt_loss.backward()
# clip gradient
global_norm = torch.nn.utils.clip_grad_norm_(self.model.parameters(),
self.config['grad_clip'])
# update
self.adjust_lr()
self.optimizer.step()
# update training stats
num_words = (targets != ac.PAD_ID).detach().numpy().sum()
loss = loss.cpu().detach().numpy()
nll_loss = nll_loss.cpu().detach().numpy()
self.num_batches_done += 1
self.log_train_loss += loss
self.log_nll_loss += nll_loss
self.log_train_weights += num_words
self.epoch_batches_done += 1
self.epoch_loss += loss
self.epoch_nll_loss += nll_loss
self.epoch_weights += num_words
self.epoch_time += time.time() - start
if self.num_batches_done % self.log_freq == 0:
acc_speed_word = self.epoch_weights / self.epoch_time
acc_speed_time = self.epoch_time / self.epoch_batches_done
avg_smooth_perp = self.log_train_loss / self.log_train_weights
avg_smooth_perp = numpy.exp(
avg_smooth_perp) if avg_smooth_perp < 300 else float('inf')
avg_true_perp = self.log_nll_loss / self.log_train_weights
avg_true_perp = numpy.exp(
avg_true_perp) if avg_true_perp < 300 else float('inf')
self.log_train_loss = 0.
self.log_nll_loss = 0.
self.log_train_weights = 0.
self.logger.info('Batch {}, epoch {}/{}:'.format(
b, e + 1, self.max_epochs))
self.logger.info(
' avg smooth perp: {0:.2f}'.format(avg_smooth_perp))
self.logger.info(
' avg true perp: {0:.2f}'.format(avg_true_perp))
self.logger.info(' acc trg words/s: {}'.format(
int(acc_speed_word)))
self.logger.info(
' acc sec/batch: {0:.2f}'.format(acc_speed_time))
self.logger.info(' global norm: {0:.2f}'.format(global_norm))
def adjust_lr(self):
if self.config['warmup_style'] == ac.ORG_WARMUP:
step = self.num_batches_done + 1.0
if step < self.config['warmup_steps']:
lr = self.config['embed_dim']**(
-0.5) * step * self.config['warmup_steps']**(-1.5)
else:
lr = max(self.config['embed_dim']**(-0.5) * step**(-0.5),
self.config['min_lr'])
for p in self.optimizer.param_groups:
p['lr'] = lr
def train(self):
self.model.train()
train_ids_file = self.data_manager.data_files['ids']
for e in range(self.max_epochs):
b = 0
for batch_data in self.data_manager.get_batch(
ids_file=train_ids_file,
shuffle=True,
num_preload=self.num_preload):
b += 1
self.run_log(b, e, batch_data)
if not self.val_per_epoch:
self.maybe_validate()
self.report_epoch(e + 1)
if self.val_per_epoch and (e + 1) % self.validate_freq == 0:
self.maybe_validate(just_validate=True)
# validate 1 last time
if not self.config['val_per_epoch']:
self.maybe_validate(just_validate=True)
self.logger.info('It is finally done, mate!')
self.logger.info('Train smoothed perps:')
self.logger.info(', '.join(map(str, self.train_smooth_perps)))
self.logger.info('Train true perps:')
self.logger.info(', '.join(map(str, self.train_true_perps)))
numpy.save(join(self.config['save_to'], 'train_smooth_perps.npy'),
self.train_smooth_perps)
numpy.save(join(self.config['save_to'], 'train_true_perps.npy'),
self.train_true_perps)
self.logger.info('Save final checkpoint')
self.save_checkpoint()
# Evaluate on test
for checkpoint in self.data_manager.checkpoints:
self.logger.info('Translate for {}'.format(checkpoint))
dev_file = self.data_manager.dev_files[checkpoint][
self.data_manager.src_lang]
test_file = self.data_manager.test_files[checkpoint][
self.data_manager.src_lang]
if exists(test_file):
self.logger.info(' Evaluate on test')
self.restart_to_best_checkpoint(checkpoint)
self.validator.translate(self.model, test_file)
self.logger.info(' Also translate dev')
self.validator.translate(self.model, dev_file)
def save_checkpoint(self):
cpkt_path = join(self.config['save_to'],
'{}.pth'.format(self.config['model_name']))
torch.save(self.model.state_dict(), cpkt_path)
def restart_to_best_checkpoint(self, checkpoint):
best_perp = numpy.min(self.validator.best_perps[checkpoint])
best_cpkt_path = self.validator.get_cpkt_path(checkpoint, best_perp)
self.logger.info('Restore best cpkt from {}'.format(best_cpkt_path))
self.model.load_state_dict(torch.load(best_cpkt_path))
def maybe_validate(self, just_validate=False):
if self.num_batches_done % self.validate_freq == 0 or just_validate:
self.save_checkpoint()
self.validator.validate_and_save(self.model)
# if doing annealing
if self.config[
'warmup_style'] == ac.NO_WARMUP and self.lr_decay > 0:
cond = len(
self.validator.perp_curve
) > self.patience and self.validator.perp_curve[-1] > max(
self.validator.perp_curve[-1 - self.patience:-1])
if cond:
metric = 'perp'
scores = self.validator.perp_curve[-1 - self.patience:]
scores = map(str, list(scores))
scores = ', '.join(scores)
self.logger.info('Past {} are {}'.format(metric, scores))
# when don't use warmup, decay lr if dev not improve
if self.lr * self.lr_decay >= self.config['min_lr']:
self.logger.info(
'Anneal the learning rate from {} to {}'.format(
self.lr, self.lr * self.lr_decay))
self.lr = self.lr * self.lr_decay
for p in self.optimizer.param_groups:
p['lr'] = self.lr