def train(
self, train_dataset, output_dir, show_running_loss=True, eval_data=None, verbose=True, **kwargs,
):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
model = self.model
args = self.args
tb_writer = SummaryWriter(logdir=args["tensorboard_dir"])
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(train_dataset, sampler=train_sampler, batch_size=args["train_batch_size"])
if args["max_steps"] > 0:
t_total = args["max_steps"]
args["num_train_epochs"] = (
args["max_steps"] // (len(train_dataloader) // args["gradient_accumulation_steps"]) + 1
)
else:
t_total = len(train_dataloader) // args["gradient_accumulation_steps"] * args["num_train_epochs"]
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [
{
"params": [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)],
"weight_decay": args["weight_decay"],
},
{"params": [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)]},
]
warmup_steps = math.ceil(t_total * args["warmup_ratio"])
args["warmup_steps"] = warmup_steps if args["warmup_steps"] == 0 else args["warmup_steps"]
# TODO: Use custom optimizer like with BertSum?
optimizer = AdamW(optimizer_grouped_parameters, lr=args["learning_rate"], eps=args["adam_epsilon"])
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=args["warmup_steps"], num_training_steps=t_total
)
if (
args["model_name"]
and os.path.isfile(os.path.join(args["model_name"], "optimizer.pt"))
and os.path.isfile(os.path.join(args["model_name"], "scheduler.pt"))
):
# Load in optimizer and scheduler states
optimizer.load_state_dict(torch.load(os.path.join(args["model_name"], "optimizer.pt")))
scheduler.load_state_dict(torch.load(os.path.join(args["model_name"], "scheduler.pt")))
if args["fp16"]:
try:
from apex import amp
except ImportError:
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=args["fp16_opt_level"])
if args["n_gpu"] > 1:
model = torch.nn.DataParallel(model)
logger.info(" Training started")
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args["num_train_epochs"]), desc="Epoch", disable=args["silent"], mininterval=0)
epoch_number = 0
best_eval_metric = None
early_stopping_counter = 0
steps_trained_in_current_epoch = 0
epochs_trained = 0
if args["model_name"] and os.path.exists(args["model_name"]):
try:
# set global_step to gobal_step of last saved checkpoint from model path
checkpoint_suffix = args["model_name"].split("/")[-1].split("-")
if len(checkpoint_suffix) > 2:
checkpoint_suffix = checkpoint_suffix[1]
else:
checkpoint_suffix = checkpoint_suffix[-1]
global_step = int(checkpoint_suffix)
epochs_trained = global_step // (len(train_dataloader) // args["gradient_accumulation_steps"])
steps_trained_in_current_epoch = global_step % (
len(train_dataloader) // args["gradient_accumulation_steps"]
)
logger.info(" Continuing training from checkpoint, will skip to saved global_step")
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d", global_step)
logger.info(" Will skip the first %d steps in the current epoch", steps_trained_in_current_epoch)
except ValueError:
logger.info(" Starting fine-tuning.")
if args["evaluate_during_training"]:
training_progress_scores = self._create_training_progress_scores(**kwargs)
if args["wandb_project"]:
wandb.init(project=args["wandb_project"], config={**args}, **args["wandb_kwargs"])
wandb.watch(self.model)
model.train()
for current_epoch in train_iterator:
if epochs_trained > 0:
epochs_trained -= 1
continue
# epoch_iterator = tqdm(train_dataloader, desc="Iteration")
for step, batch in enumerate(tqdm(train_dataloader, desc="Current iteration", disable=args["silent"])):
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
# batch = tuple(t.to(device) for t in batch)
inputs = self._get_inputs_dict(batch)
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
if args["n_gpu"] > 1:
loss = loss.mean() # mean() to average on multi-gpu parallel training
current_loss = loss.item()
if show_running_loss:
print("\rRunning loss: %f" % loss, end="")
if args["gradient_accumulation_steps"] > 1:
loss = loss / args["gradient_accumulation_steps"]
if args["fp16"]:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
# torch.nn.utils.clip_grad_norm_(
# amp.master_params(optimizer), args["max_grad_norm"]
# )
else:
loss.backward()
# torch.nn.utils.clip_grad_norm_(
# model.parameters(), args["max_grad_norm"]
# )
tr_loss += loss.item()
if (step + 1) % args["gradient_accumulation_steps"] == 0:
if args["fp16"]:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args["max_grad_norm"])
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), args["max_grad_norm"])
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args["logging_steps"] > 0 and global_step % args["logging_steps"] == 0:
# Log metrics
tb_writer.add_scalar("lr", scheduler.get_lr()[0], global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) / args["logging_steps"], global_step)
logging_loss = tr_loss
if args["wandb_project"]:
wandb.log(
{
"Training loss": current_loss,
"lr": scheduler.get_lr()[0],
"global_step": global_step,
}
)
if args["save_steps"] > 0 and global_step % args["save_steps"] == 0:
# Save model checkpoint
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
self._save_model(output_dir_current, optimizer, scheduler, model=model)
if args["evaluate_during_training"] and (
args["evaluate_during_training_steps"] > 0
and global_step % args["evaluate_during_training_steps"] == 0
):
# Only evaluate when single GPU otherwise metrics may not average well
results = self.eval_model(
eval_data,
verbose=verbose and args["evaluate_during_training_verbose"],
silent=True,
**kwargs,
)
for key, value in results.items():
tb_writer.add_scalar("eval_{}".format(key), value, global_step)
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
if args["save_eval_checkpoints"]:
self._save_model(output_dir_current, optimizer, scheduler, model=model, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(
os.path.join(args["output_dir"], "training_progress_scores.csv"), index=False,
)
if args["wandb_project"]:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_metric:
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(
args["best_model_dir"], optimizer, scheduler, model=model, results=results
)
if best_eval_metric and args["early_stopping_metric_minimize"]:
if (
results[args["early_stopping_metric"]] - best_eval_metric
< args["early_stopping_delta"]
):
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(
args["best_model_dir"], optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args["use_early_stopping"]:
if early_stopping_counter < args["early_stopping_patience"]:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args['early_stopping_metric']}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args['early_stopping_patience']}")
else:
if verbose:
logger.info(
f" Patience of {args['early_stopping_patience']} steps reached"
)
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if (
results[args["early_stopping_metric"]] - best_eval_metric
> args["early_stopping_delta"]
):
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(
args["best_model_dir"], optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args["use_early_stopping"]:
if early_stopping_counter < args["early_stopping_patience"]:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args['early_stopping_metric']}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args['early_stopping_patience']}")
else:
if verbose:
logger.info(
f" Patience of {args['early_stopping_patience']} steps reached"
)
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
epoch_number += 1
output_dir_current = os.path.join(output_dir, "checkpoint-{}-epoch-{}".format(global_step, epoch_number))
if args["save_model_every_epoch"] or args["evaluate_during_training"]:
os.makedirs(output_dir_current, exist_ok=True)
if args["save_model_every_epoch"]:
self._save_model(output_dir_current, optimizer, scheduler, model=model)
if args["evaluate_during_training"]:
results = self.eval_model(
eval_data, verbose=verbose and args["evaluate_during_training_verbose"], silent=True, **kwargs
)
if args["save_eval_checkpoints"]:
self._save_model(output_dir_current, optimizer, scheduler, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(os.path.join(args["output_dir"], "training_progress_scores.csv"), index=False)
if args["wandb_project"]:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_metric:
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(args["best_model_dir"], optimizer, scheduler, model=model, results=results)
if best_eval_metric and args["early_stopping_metric_minimize"]:
if results[args["early_stopping_metric"]] - best_eval_metric < args["early_stopping_delta"]:
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(
args["best_model_dir"], optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args["use_early_stopping"] and args["early_stopping_consider_epochs"]:
if early_stopping_counter < args["early_stopping_patience"]:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args['early_stopping_metric']}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args['early_stopping_patience']}")
else:
if verbose:
logger.info(f" Patience of {args['early_stopping_patience']} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if results[args["early_stopping_metric"]] - best_eval_metric > args["early_stopping_delta"]:
best_eval_metric = results[args["early_stopping_metric"]]
if args["save_best_model"]:
self._save_model(
args["best_model_dir"], optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args["use_early_stopping"] and args["early_stopping_consider_epochs"]:
if early_stopping_counter < args["early_stopping_patience"]:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args['early_stopping_metric']}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args['early_stopping_patience']}")
else:
if verbose:
logger.info(f" Patience of {args['early_stopping_patience']} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
return global_step, tr_loss / global_step
def generate(self, x: np.ndarray, y: Optional[np.ndarray] = None, **kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs to be attacked.
:param y: Target values (class labels) one-hot-encoded of shape (nb_samples, nb_classes) or indices of shape
(nb_samples,). If `self.targeted` is true, then `y` represents the target labels. If `self.targeted`
is true, then `y_val` represents the target labels. Otherwise, the targets are the original class
labels.
:return: An array holding the adversarial examples.
"""
y = check_and_transform_label_format(y, self.estimator.nb_classes)
x_adv = x.astype(ART_NUMPY_DTYPE)
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
else:
clip_min, clip_max = np.amin(x), np.amax(x)
# Assert that, if attack is targeted, y_val is provided:
if self.targeted and y is None:
raise ValueError("Target labels `y` need to be provided for a targeted attack.")
# No labels provided, use model prediction as correct class
if y is None:
y = get_labels_np_array(self.estimator.predict(x, batch_size=self.batch_size))
# Compute perturbation with implicit batching
nb_batches = int(np.ceil(x_adv.shape[0] / float(self.batch_size)))
for batch_id in trange(nb_batches, desc="C&W L_2", disable=not self.verbose):
batch_index_1, batch_index_2 = batch_id * self.batch_size, (batch_id + 1) * self.batch_size
x_batch = x_adv[batch_index_1:batch_index_2]
y_batch = y[batch_index_1:batch_index_2]
# The optimization is performed in tanh space to keep the adversarial images bounded in correct range
x_batch_tanh = original_to_tanh(x_batch, clip_min, clip_max, self._tanh_smoother)
# Initialize binary search:
c_current = self.initial_const * np.ones(x_batch.shape[0])
c_lower_bound = np.zeros(x_batch.shape[0])
c_double = np.ones(x_batch.shape[0]) > 0
# Initialize placeholders for best l2 distance and attack found so far
best_l2dist = np.inf * np.ones(x_batch.shape[0])
best_x_adv_batch = x_batch.copy()
for bss in range(self.binary_search_steps):
logger.debug(
"Binary search step %i out of %i (c_mean==%f)", bss, self.binary_search_steps, np.mean(c_current),
)
nb_active = int(np.sum(c_current < self._c_upper_bound))
logger.debug(
"Number of samples with c_current < _c_upper_bound: %i out of %i", nb_active, x_batch.shape[0],
)
if nb_active == 0:
break
learning_rate = self.learning_rate * np.ones(x_batch.shape[0])
# Initialize perturbation in tanh space:
x_adv_batch = x_batch.copy()
x_adv_batch_tanh = x_batch_tanh.copy()
z_logits, l2dist, loss = self._loss(x_batch, x_adv_batch, y_batch, c_current)
attack_success = loss - l2dist <= 0
overall_attack_success = attack_success
for i_iter in range(self.max_iter):
logger.debug("Iteration step %i out of %i", i_iter, self.max_iter)
logger.debug("Average Loss: %f", np.mean(loss))
logger.debug("Average L2Dist: %f", np.mean(l2dist))
logger.debug("Average Margin Loss: %f", np.mean(loss - l2dist))
logger.debug(
"Current number of succeeded attacks: %i out of %i",
int(np.sum(attack_success)),
len(attack_success),
)
improved_adv = attack_success & (l2dist < best_l2dist)
logger.debug("Number of improved L2 distances: %i", int(np.sum(improved_adv)))
if np.sum(improved_adv) > 0:
best_l2dist[improved_adv] = l2dist[improved_adv]
best_x_adv_batch[improved_adv] = x_adv_batch[improved_adv]
active = (c_current < self._c_upper_bound) & (learning_rate > 0)
nb_active = int(np.sum(active))
logger.debug(
"Number of samples with c_current < _c_upper_bound and learning_rate > 0: %i out of %i",
nb_active,
x_batch.shape[0],
)
if nb_active == 0:
break
# compute gradient:
logger.debug("Compute loss gradient")
perturbation_tanh = -self._loss_gradient(
z_logits[active],
y_batch[active],
x_batch[active],
x_adv_batch[active],
x_adv_batch_tanh[active],
c_current[active],
clip_min,
clip_max,
)
# perform line search to optimize perturbation
# first, halve the learning rate until perturbation actually decreases the loss:
prev_loss = loss.copy()
best_loss = loss.copy()
best_lr = np.zeros(x_batch.shape[0])
halving = np.zeros(x_batch.shape[0])
for i_halve in range(self.max_halving):
logger.debug(
"Perform halving iteration %i out of %i", i_halve, self.max_halving,
)
do_halving = loss[active] >= prev_loss[active]
logger.debug(
"Halving to be performed on %i samples", int(np.sum(do_halving)),
)
if np.sum(do_halving) == 0:
break
active_and_do_halving = active.copy()
active_and_do_halving[active] = do_halving
lr_mult = learning_rate[active_and_do_halving]
for _ in range(len(x.shape) - 1):
lr_mult = lr_mult[:, np.newaxis]
x_adv1 = x_adv_batch_tanh[active_and_do_halving]
new_x_adv_batch_tanh = x_adv1 + lr_mult * perturbation_tanh[do_halving]
new_x_adv_batch = tanh_to_original(new_x_adv_batch_tanh, clip_min, clip_max)
_, l2dist[active_and_do_halving], loss[active_and_do_halving] = self._loss(
x_batch[active_and_do_halving],
new_x_adv_batch,
y_batch[active_and_do_halving],
c_current[active_and_do_halving],
)
logger.debug("New Average Loss: %f", np.mean(loss))
logger.debug("New Average L2Dist: %f", np.mean(l2dist))
logger.debug("New Average Margin Loss: %f", np.mean(loss - l2dist))
best_lr[loss < best_loss] = learning_rate[loss < best_loss]
best_loss[loss < best_loss] = loss[loss < best_loss]
learning_rate[active_and_do_halving] /= 2
halving[active_and_do_halving] += 1
learning_rate[active] *= 2
# if no halving was actually required, double the learning rate as long as this
# decreases the loss:
for i_double in range(self.max_doubling):
logger.debug(
"Perform doubling iteration %i out of %i", i_double, self.max_doubling,
)
do_doubling = (halving[active] == 1) & (loss[active] <= best_loss[active])
logger.debug(
"Doubling to be performed on %i samples", int(np.sum(do_doubling)),
)
if np.sum(do_doubling) == 0:
break
active_and_do_doubling = active.copy()
active_and_do_doubling[active] = do_doubling
learning_rate[active_and_do_doubling] *= 2
lr_mult = learning_rate[active_and_do_doubling]
for _ in range(len(x.shape) - 1):
lr_mult = lr_mult[:, np.newaxis]
x_adv2 = x_adv_batch_tanh[active_and_do_doubling]
new_x_adv_batch_tanh = x_adv2 + lr_mult * perturbation_tanh[do_doubling]
new_x_adv_batch = tanh_to_original(new_x_adv_batch_tanh, clip_min, clip_max)
_, l2dist[active_and_do_doubling], loss[active_and_do_doubling] = self._loss(
x_batch[active_and_do_doubling],
new_x_adv_batch,
y_batch[active_and_do_doubling],
c_current[active_and_do_doubling],
)
logger.debug("New Average Loss: %f", np.mean(loss))
logger.debug("New Average L2Dist: %f", np.mean(l2dist))
logger.debug("New Average Margin Loss: %f", np.mean(loss - l2dist))
best_lr[loss < best_loss] = learning_rate[loss < best_loss]
best_loss[loss < best_loss] = loss[loss < best_loss]
learning_rate[halving == 1] /= 2
update_adv = best_lr[active] > 0
logger.debug(
"Number of adversarial samples to be finally updated: %i", int(np.sum(update_adv)),
)
if np.sum(update_adv) > 0:
active_and_update_adv = active.copy()
active_and_update_adv[active] = update_adv
best_lr_mult = best_lr[active_and_update_adv]
for _ in range(len(x.shape) - 1):
best_lr_mult = best_lr_mult[:, np.newaxis]
x_adv4 = x_adv_batch_tanh[active_and_update_adv]
best_lr1 = best_lr_mult * perturbation_tanh[update_adv]
x_adv_batch_tanh[active_and_update_adv] = x_adv4 + best_lr1
x_adv6 = x_adv_batch_tanh[active_and_update_adv]
x_adv_batch[active_and_update_adv] = tanh_to_original(x_adv6, clip_min, clip_max)
(
z_logits[active_and_update_adv],
l2dist[active_and_update_adv],
loss[active_and_update_adv],
) = self._loss(
x_batch[active_and_update_adv],
x_adv_batch[active_and_update_adv],
y_batch[active_and_update_adv],
c_current[active_and_update_adv],
)
attack_success = loss - l2dist <= 0
overall_attack_success = overall_attack_success | attack_success
# Update depending on attack success:
improved_adv = attack_success & (l2dist < best_l2dist)
logger.debug("Number of improved L2 distances: %i", int(np.sum(improved_adv)))
if np.sum(improved_adv) > 0:
best_l2dist[improved_adv] = l2dist[improved_adv]
best_x_adv_batch[improved_adv] = x_adv_batch[improved_adv]
c_double[overall_attack_success] = False
c_current[overall_attack_success] = (c_lower_bound + c_current)[overall_attack_success] / 2
c_old = c_current
c_current[~overall_attack_success & c_double] *= 2
c_current1 = (c_current - c_lower_bound)[~overall_attack_success & ~c_double]
c_current[~overall_attack_success & ~c_double] += c_current1 / 2
c_lower_bound[~overall_attack_success] = c_old[~overall_attack_success]
x_adv[batch_index_1:batch_index_2] = best_x_adv_batch
logger.info(
"Success rate of C&W L_2 attack: %.2f%%",
100 * compute_success(self.estimator, x, y, x_adv, self.targeted, batch_size=self.batch_size),
)
return x_adv
def train(self, model_path: Optional[str] = None):
"""
Main training entry point.
Args:
model_path:
(Optional) Local path to model if model to train has been instantiated from a local path
If present, we will try reloading the optimizer/scheduler states from there.
"""
train_dataloader = self.get_train_dataloader()
if self.args.max_steps > 0:
t_total = self.args.max_steps
num_train_epochs = (
self.args.max_steps // (len(train_dataloader) // self.args.gradient_accumulation_steps) + 1
)
else:
t_total = int(len(train_dataloader) // self.args.gradient_accumulation_steps * self.args.num_train_epochs)
num_train_epochs = self.args.num_train_epochs
optimizer, scheduler = self.get_optimizers(num_training_steps=t_total)
# Check if saved optimizer or scheduler states exist
if (
model_path is not None
and os.path.isfile(os.path.join(model_path, "optimizer.pt"))
and os.path.isfile(os.path.join(model_path, "scheduler.pt"))
):
# Load in optimizer and scheduler states
optimizer.load_state_dict(
torch.load(os.path.join(model_path, "optimizer.pt"), map_location=self.args.device)
)
scheduler.load_state_dict(torch.load(os.path.join(model_path, "scheduler.pt")))
model = self.model
if self.args.fp16:
if not is_apex_available():
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=self.args.fp16_opt_level)
# multi-gpu training (should be after apex fp16 initialization)
if self.args.n_gpu > 1:
model = torch.nn.DataParallel(model)
# Distributed training (should be after apex fp16 initialization)
if self.args.local_rank != -1:
model = torch.nn.parallel.DistributedDataParallel(
model,
device_ids=[self.args.local_rank],
output_device=self.args.local_rank,
find_unused_parameters=True,
)
if self.tb_writer is not None:
self.tb_writer.add_text("args", self.args.to_json_string())
self.tb_writer.add_hparams(self.args.to_sanitized_dict(), metric_dict={})
# Train!
if is_tpu_available():
total_train_batch_size = self.args.train_batch_size * xm.xrt_world_size()
else:
total_train_batch_size = (
self.args.train_batch_size
* self.args.gradient_accumulation_steps
* (torch.distributed.get_world_size() if self.args.local_rank != -1 else 1)
)
logger.info("***** Running training *****")
logger.info(" Num examples = %d", self.num_examples(train_dataloader))
logger.info(" Num Epochs = %d", num_train_epochs)
logger.info(" Instantaneous batch size per device = %d", self.args.per_gpu_train_batch_size)
logger.info(" Total train batch size (w. parallel, distributed & accumulation) = %d", total_train_batch_size)
logger.info(" Gradient Accumulation steps = %d", self.args.gradient_accumulation_steps)
logger.info(" Total optimization steps = %d", t_total)
self.global_step = 0
self.epoch = 0
epochs_trained = 0
steps_trained_in_current_epoch = 0
# Check if continuing training from a checkpoint
if model_path is not None:
# set global_step to global_step of last saved checkpoint from model path
try:
self.global_step = int(model_path.split("-")[-1].split("/")[0])
epochs_trained = self.global_step // (len(train_dataloader) // self.args.gradient_accumulation_steps)
steps_trained_in_current_epoch = self.global_step % (
len(train_dataloader) // self.args.gradient_accumulation_steps
)
logger.info(" Continuing training from checkpoint, will skip to saved global_step")
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d", self.global_step)
logger.info(" Will skip the first %d steps in the first epoch", steps_trained_in_current_epoch)
except ValueError:
self.global_step = 0
logger.info(" Starting fine-tuning.")
tr_loss = 0.0
logging_loss = 0.0
model.zero_grad()
train_iterator = trange(
epochs_trained, int(num_train_epochs), desc="Epoch", disable=not self.is_local_master()
)
self.eval_history = []
for epoch in train_iterator:
if isinstance(train_dataloader, DataLoader) and isinstance(train_dataloader.sampler, DistributedSampler):
train_dataloader.sampler.set_epoch(epoch)
epoch_iterator = tqdm(train_dataloader, desc=f"Epoch-{epoch}", disable=not self.is_local_master())
for step, inputs in enumerate(epoch_iterator):
# Skip past any already trained steps if resuming training
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
if self.args.do_aug:
if self.args.aug_type == 'span_cutoff':
step_loss = self._training_step_with_span_cutoff(model, inputs, optimizer)
elif self.args.aug_type == 'token_cutoff':
step_loss = self._training_step_with_token_cutoff(model, inputs, optimizer)
elif self.args.aug_type == 'dim_cutoff':
step_loss = self._training_step_with_dim_cutoff(model, inputs, optimizer)
else:
raise NotImplementedError
else:
step_loss = self._training_step(model, inputs, optimizer)
tr_loss += step_loss
if (step + 1) % self.args.gradient_accumulation_steps == 0 or (
# last step in epoch but step is always smaller than gradient_accumulation_steps
len(epoch_iterator) <= self.args.gradient_accumulation_steps
and (step + 1) == len(epoch_iterator)
):
if self.args.max_grad_norm > 0:
if self.args.fp16:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), self.args.max_grad_norm)
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), self.args.max_grad_norm)
if is_tpu_available():
xm.optimizer_step(optimizer)
else:
optimizer.step()
scheduler.step()
model.zero_grad()
self.global_step += 1
self.epoch = epoch + (step + 1) / len(epoch_iterator)
if (self.args.logging_steps > 0 and self.global_step % self.args.logging_steps == 0) or (
self.global_step == 1 and self.args.logging_first_step
):
logs: Dict[str, float] = {}
logs["loss"] = (tr_loss - logging_loss) / self.args.logging_steps
# backward compatibility for pytorch schedulers
logs["learning_rate"] = (
scheduler.get_last_lr()[0]
if version.parse(torch.__version__) >= version.parse("1.4")
else scheduler.get_lr()[0]
)
logging_loss = tr_loss
print()
self._log(logs)
# if self.args.evaluate_during_training and self.args.save_steps % self.args.logging_steps == 0:
# self.evaluate()
if self.is_world_master() and self.args.evaluate_during_training and \
self.args.save_steps > 0 and self.global_step % self.args.save_steps == 0:
self.evaluate_and_save_model(model, optimizer, scheduler)
if self.args.max_steps > 0 and self.global_step > self.args.max_steps:
epoch_iterator.close()
break
if self.args.max_steps > 0 and self.global_step > self.args.max_steps:
train_iterator.close()
break
if self.is_world_master() and self.args.evaluate_during_training:
self.evaluate_and_save_model(model, optimizer, scheduler)
if self.args.tpu_metrics_debug:
# tpu-comment: Logging debug metrics for PyTorch/XLA (compile, execute times, ops, etc.)
xm.master_print(met.metrics_report())
if self.tb_writer:
self.tb_writer.close()
logger.info("\n\nTraining completed.\n\n")
self.eval_history = sorted(self.eval_history, key=lambda x: x[0])
for x in self.eval_history:
del x[-1]
report_results(self.eval_header, self.eval_history, axis=self.eval_key_axis)
return TrainOutput(self.global_step, tr_loss / self.global_step)
def train(self, model_path: Optional[str] = None):
"""
Main training entry point.
Args:
model_path (:obj:`str`, `optional`):
Local path to the model if the model to train has been instantiated from a local path. If present,
training will resume from the optimizer/scheduler states loaded here.
"""
train_dataloader = self.get_train_dataloader()
if self.args.max_steps > 0:
t_total = self.args.max_steps
num_train_epochs = (
self.args.max_steps // (len(train_dataloader) // self.args.gradient_accumulation_steps) + 1
)
else:
t_total = int(len(train_dataloader) // self.args.gradient_accumulation_steps * self.args.num_train_epochs)
num_train_epochs = self.args.num_train_epochs
optimizer, scheduler = self.get_optimizers(num_training_steps=t_total)
# Check if saved optimizer or scheduler states exist
if (
model_path is not None
and os.path.isfile(os.path.join(model_path, "optimizer.pt"))
and os.path.isfile(os.path.join(model_path, "scheduler.pt"))
):
# Load in optimizer and scheduler states
optimizer.load_state_dict(
torch.load(os.path.join(model_path, "optimizer.pt"), map_location=self.args.device)
)
scheduler.load_state_dict(torch.load(os.path.join(model_path, "scheduler.pt")))
model = self.model
if self.args.fp16:
if not is_apex_available():
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=self.args.fp16_opt_level)
# multi-gpu training (should be after apex fp16 initialization)
if self.args.n_gpu > 1:
model = torch.nn.DataParallel(model)
# Distributed training (should be after apex fp16 initialization)
if self.args.local_rank != -1:
model = torch.nn.parallel.DistributedDataParallel(
model,
device_ids=[self.args.local_rank],
output_device=self.args.local_rank,
find_unused_parameters=True,
)
if self.tb_writer is not None:
self.tb_writer.add_text("args", self.args.to_json_string())
self.tb_writer.add_hparams(self.args.to_sanitized_dict(), metric_dict={})
# Train!
if is_torch_tpu_available():
total_train_batch_size = self.args.train_batch_size * xm.xrt_world_size()
else:
total_train_batch_size = (
self.args.train_batch_size
* self.args.gradient_accumulation_steps
* (torch.distributed.get_world_size() if self.args.local_rank != -1 else 1)
)
logger.info("***** Running training *****")
logger.info(" Num examples = %d", self.num_examples(train_dataloader))
logger.info(" Num Epochs = %d", num_train_epochs)
logger.info(" Instantaneous batch size per device = %d", self.args.per_device_train_batch_size)
logger.info(" Total train batch size (w. parallel, distributed & accumulation) = %d", total_train_batch_size)
logger.info(" Gradient Accumulation steps = %d", self.args.gradient_accumulation_steps)
logger.info(" Total optimization steps = %d", t_total)
self.global_step = 0
self.epoch = 0
epochs_trained = 0
steps_trained_in_current_epoch = 0
# Check if continuing training from a checkpoint
if model_path is not None:
# set global_step to global_step of last saved checkpoint from model path
try:
self.global_step = int(model_path.split("-")[-1].split("/")[0])
epochs_trained = self.global_step // (len(train_dataloader) // self.args.gradient_accumulation_steps)
steps_trained_in_current_epoch = self.global_step % (
len(train_dataloader) // self.args.gradient_accumulation_steps
)
logger.info(" Continuing training from checkpoint, will skip to saved global_step")
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d", self.global_step)
logger.info(" Will skip the first %d steps in the first epoch", steps_trained_in_current_epoch)
except ValueError:
self.global_step = 0
logger.info(" Starting fine-tuning.")
tr_loss = 0.0
logging_loss = 0.0
model.zero_grad()
train_iterator = trange(
epochs_trained, int(num_train_epochs), desc="Epoch", disable=not self.is_local_master()
)
for epoch in train_iterator:
if isinstance(train_dataloader, DataLoader) and isinstance(train_dataloader.sampler, DistributedSampler):
train_dataloader.sampler.set_epoch(epoch)
if is_torch_tpu_available():
parallel_loader = pl.ParallelLoader(train_dataloader, [self.args.device]).per_device_loader(
self.args.device
)
epoch_iterator = tqdm(parallel_loader, desc="Iteration", disable=not self.is_local_master())
else:
epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=not self.is_local_master())
# Reset the past mems state at the beginning of each epoch if necessary.
if self.args.past_index >= 0:
self._past = None
for step, inputs in enumerate(epoch_iterator):
# Skip past any already trained steps if resuming training
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
tr_loss += self.training_step(model, inputs, optimizer)
if (step + 1) % self.args.gradient_accumulation_steps == 0 or (
# last step in epoch but step is always smaller than gradient_accumulation_steps
len(epoch_iterator) <= self.args.gradient_accumulation_steps
and (step + 1) == len(epoch_iterator)
):
if self.args.fp16:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), self.args.max_grad_norm)
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), self.args.max_grad_norm)
if is_torch_tpu_available():
xm.optimizer_step(optimizer)
else:
optimizer.step()
scheduler.step()
model.zero_grad()
self.global_step += 1
self.epoch = epoch + (step + 1) / len(epoch_iterator)
if (self.args.logging_steps > 0 and self.global_step % self.args.logging_steps == 0) or (
self.global_step == 1 and self.args.logging_first_step
):
logs: Dict[str, float] = {}
logs["loss"] = (tr_loss - logging_loss) / self.args.logging_steps
# backward compatibility for pytorch schedulers
logs["learning_rate"] = (
scheduler.get_last_lr()[0]
if version.parse(torch.__version__) >= version.parse("1.4")
else scheduler.get_lr()[0]
)
logging_loss = tr_loss
self.log(logs)
if self.args.evaluate_during_training and self.global_step % self.args.eval_steps == 0:
self.evaluate()
if self.args.save_steps > 0 and self.global_step % self.args.save_steps == 0:
# In all cases (even distributed/parallel), self.model is always a reference
# to the model we want to save.
if hasattr(model, "module"):
assert model.module is self.model
else:
assert model is self.model
# Save model checkpoint
output_dir = os.path.join(self.args.output_dir, f"{PREFIX_CHECKPOINT_DIR}-{self.global_step}")
self.save_model(output_dir)
if self.is_world_master():
self._rotate_checkpoints()
if is_torch_tpu_available():
xm.rendezvous("saving_optimizer_states")
xm.save(optimizer.state_dict(), os.path.join(output_dir, "optimizer.pt"))
xm.save(scheduler.state_dict(), os.path.join(output_dir, "scheduler.pt"))
elif self.is_world_master():
torch.save(optimizer.state_dict(), os.path.join(output_dir, "optimizer.pt"))
torch.save(scheduler.state_dict(), os.path.join(output_dir, "scheduler.pt"))
if self.args.max_steps > 0 and self.global_step > self.args.max_steps:
epoch_iterator.close()
break
if self.args.max_steps > 0 and self.global_step > self.args.max_steps:
train_iterator.close()
break
if self.args.tpu_metrics_debug or self.args.debug:
# tpu-comment: Logging debug metrics for PyTorch/XLA (compile, execute times, ops, etc.)
xm.master_print(met.metrics_report())
if self.tb_writer:
self.tb_writer.close()
if self.args.past_index and hasattr(self, "_past"):
# Clean the state at the end of training
delattr(self, "_past")
logger.info("\n\nTraining completed. Do not forget to share your model on huggingface.co/models =)\n\n")
return TrainOutput(self.global_step, tr_loss / self.global_step)
def generate(self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
**kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs.
:param y: Target values (class labels) one-hot-encoded of shape `(nb_samples, nb_classes)` or indices of shape
(nb_samples,). Only provide this parameter if you'd like to use true labels when crafting adversarial
samples. Otherwise, model predictions are used as labels to avoid the "label leaking" effect
(explained in this paper: https://arxiv.org/abs/1611.01236). Default is `None`.
:param mask: An array with a mask broadcastable to input `x` defining where to apply adversarial perturbations.
Shape needs to be broadcastable to the shape of x and can also be of the same shape as `x`. Any
features for which the mask is zero will not be adversarially perturbed.
:type mask: `np.ndarray`
:return: An array holding the adversarial examples.
"""
mask = kwargs.get("mask")
y = check_and_transform_label_format(y, self.estimator.nb_classes)
if y is None:
if self.targeted:
raise ValueError(
"Target labels `y` need to be provided for a targeted attack."
)
y = get_labels_np_array(
self.estimator.predict(x, batch_size=self.batch_size)).astype(
np.int32)
x_adv = x.astype(ART_NUMPY_DTYPE)
for _ in trange(max(1, self.nb_random_init),
desc="AutoPGD - restart",
disable=not self.verbose):
# Determine correctly predicted samples
y_pred = self.estimator.predict(x_adv)
if self.targeted:
sample_is_robust = np.argmax(y_pred, axis=1) != np.argmax(
y, axis=1)
elif not self.targeted:
sample_is_robust = np.argmax(y_pred,
axis=1) == np.argmax(y, axis=1)
if np.sum(sample_is_robust) == 0:
break
x_robust = x_adv[sample_is_robust]
y_robust = y[sample_is_robust]
x_init = x[sample_is_robust]
n = x_robust.shape[0]
m = np.prod(x_robust.shape[1:]).item()
random_perturbation = (random_sphere(
n, m, self.eps,
self.norm).reshape(x_robust.shape).astype(ART_NUMPY_DTYPE))
x_robust = x_robust + random_perturbation
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
x_robust = np.clip(x_robust, clip_min, clip_max)
perturbation = projection(x_robust - x_init, self.eps, self.norm)
x_robust = x_init + perturbation
# Compute perturbation with implicit batching
for batch_id in trange(
int(np.ceil(x_robust.shape[0] / float(self.batch_size))),
desc="AutoPGD - batch",
leave=False,
disable=not self.verbose,
):
self.eta = 2 * self.eps_step
batch_index_1, batch_index_2 = batch_id * self.batch_size, (
batch_id + 1) * self.batch_size
x_k = x_robust[batch_index_1:batch_index_2].astype(
ART_NUMPY_DTYPE)
x_init_batch = x_init[batch_index_1:batch_index_2].astype(
ART_NUMPY_DTYPE)
y_batch = y_robust[batch_index_1:batch_index_2]
p_0 = 0
p_1 = 0.22
W = [p_0, p_1]
while True:
p_j_p_1 = W[-1] + max(W[-1] - W[-2] - 0.03, 0.06)
if p_j_p_1 > 1:
break
W.append(p_j_p_1)
W = [math.ceil(p * self.max_iter) for p in W]
eta = self.eps_step
self.count_condition_1 = 0
for k_iter in trange(self.max_iter,
desc="AutoPGD - iteration",
leave=False,
disable=not self.verbose):
# Get perturbation, use small scalar to avoid division by 0
tol = 10e-8
# Get gradient wrt loss; invert it if attack is targeted
grad = self.estimator.loss_gradient(
x_k, y_batch) * (1 - 2 * int(self.targeted))
# Apply norm bound
if self.norm in [np.inf, "inf"]:
grad = np.sign(grad)
elif self.norm == 1:
ind = tuple(range(1, len(x_k.shape)))
grad = grad / (np.sum(
np.abs(grad), axis=ind, keepdims=True) + tol)
elif self.norm == 2:
ind = tuple(range(1, len(x_k.shape)))
grad = grad / (np.sqrt(
np.sum(np.square(grad), axis=ind, keepdims=True)) +
tol)
assert x_k.shape == grad.shape
perturbation = grad
if mask is not None:
perturbation = perturbation * (
mask.astype(ART_NUMPY_DTYPE))
# Apply perturbation and clip
z_k_p_1 = x_k + eta * perturbation
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
z_k_p_1 = np.clip(z_k_p_1, clip_min, clip_max)
if k_iter == 0:
x_1 = z_k_p_1
perturbation = projection(x_1 - x_init_batch, self.eps,
self.norm)
x_1 = x_init_batch + perturbation
f_0 = self.estimator.loss(x=x_k,
y=y_batch,
reduction="mean")
f_1 = self.estimator.loss(x=x_1,
y=y_batch,
reduction="mean")
self.eta_w_j_m_1 = eta
self.f_max_w_j_m_1 = f_0
if f_1 >= f_0:
self.f_max = f_1
self.x_max = x_1
self.x_max_m_1 = x_init_batch
self.count_condition_1 += 1
else:
self.f_max = f_0
self.x_max = x_k.copy()
self.x_max_m_1 = x_init_batch
# Settings for next iteration k
x_k_m_1 = x_k.copy()
x_k = x_1
else:
perturbation = projection(z_k_p_1 - x_init_batch,
self.eps, self.norm)
z_k_p_1 = x_init_batch + perturbation
alpha = 0.75
x_k_p_1 = x_k + alpha * (z_k_p_1 - x_k) + (
1 - alpha) * (x_k - x_k_m_1)
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
x_k_p_1 = np.clip(x_k_p_1, clip_min, clip_max)
perturbation = projection(x_k_p_1 - x_init_batch,
self.eps, self.norm)
x_k_p_1 = x_init_batch + perturbation
f_k_p_1 = self.estimator.loss(x=x_k_p_1,
y=y_batch,
reduction="mean")
if f_k_p_1 == 0.0:
x_k = x_k_p_1.copy()
break
if (not self.targeted and f_k_p_1 > self.f_max) or (
self.targeted and f_k_p_1 < self.f_max):
self.count_condition_1 += 1
self.x_max = x_k_p_1
self.x_max_m_1 = x_k
self.f_max = f_k_p_1
if k_iter in W:
rho = 0.75
condition_1 = self.count_condition_1 < rho * (
k_iter - W[W.index(k_iter) - 1])
condition_2 = self.eta_w_j_m_1 == eta and self.f_max_w_j_m_1 == self.f_max
if condition_1 or condition_2:
eta = eta / 2
x_k_m_1 = self.x_max_m_1
x_k = self.x_max
else:
x_k_m_1 = x_k
x_k = x_k_p_1.copy()
self.count_condition_1 = 0
self.eta_w_j_m_1 = eta
self.f_max_w_j_m_1 = self.f_max
else:
x_k_m_1 = x_k
x_k = x_k_p_1.copy()
y_pred_adv_k = self.estimator.predict(x_k)
if self.targeted:
sample_is_not_robust_k = np.invert(
np.argmax(y_pred_adv_k, axis=1) != np.argmax(y_batch,
axis=1))
elif not self.targeted:
sample_is_not_robust_k = np.invert(
np.argmax(y_pred_adv_k, axis=1) == np.argmax(y_batch,
axis=1))
x_robust[batch_index_1:batch_index_2][
sample_is_not_robust_k] = x_k[sample_is_not_robust_k]
x_adv[sample_is_robust] = x_robust
return x_adv
import numpy as np
from sten import Sten
from tqdm.auto import tqdm, trange
from multiprocessing.pool import ThreadPool as Pool
# -
def create(x):
st = Sten(x)
pathlib.Path("./encodedArray/bit_{0}".format(x)).mkdir(parents=True, exist_ok=True)
pathlib.Path("./decodedArray/bit_{0}".format(x)).mkdir(parents=True, exist_ok=True)
for set1File in trange(1, int(sys.argv[1])+1):
for set2File in trange(1, int(sys.argv[2])+1):
name = str(set1File) + '_' + str(set2File)
encImg = st.encode("./data/set1/{}.jpg".format(set1File), "./data/set2/{}.jpg".format(set2File), "./encodedArray/bit_{0}/{1}.npy".format(x, name))
decImg = st.decode("./encodedArray/bit_{0}/{1}.npy".format(x, name), "./decodedArray/bit_{0}/{1}.npy".format(x, name))
pool_size = 9
pool = Pool(pool_size)
for x in trange(0, 9):
pool.apply_async(create, (x,))
pool.close()
pool.join()
def main(config):
pprint(config)
batch_size = config['batch_size']
epochs = config['epochs']
hidden_dim = config['hidden_dim']
embedding_dim = config['embed_dim']
num_layers = config['num_layers']
dropout = config['dropout']
learning_rate = config['learning_rate']
scale = config['scale']
number_of_runs = config['num_runs']
metrics_dict = {}
data_dir = config['data_dir']
epsilon = config['epsilon']
for i in trange(number_of_runs):
data_name = os.path.join(data_dir, f'reddit-bert.pkl')
with open(data_name, 'rb') as f:
df = pickle.load(f)
df_train, df_test, _, __ = train_test_split(
df,
df['label'].tolist(),
test_size=0.2,
stratify=df['label'].tolist())
train_dataset = RedditDataset(df_train.label.values,
df_train.enc.values)
train_dataloader = DataLoader(train_dataset,
batch_size=batch_size,
collate_fn=pad_collate_reddit,
shuffle=True)
test_dataset = RedditDataset(df_test.label.values, df_test.enc.values)
test_dataloader = DataLoader(test_dataset,
batch_size=batch_size,
collate_fn=pad_collate_reddit)
model = AdvRedditModel(embedding_dim, hidden_dim, num_layers, dropout,
epsilon)
device = 'cuda' if torch.cuda.is_available() else 'cpu'
model.to(device)
print(device)
optimizer = AdamW(model.parameters(),
lr=learning_rate,
weight_decay=0.03)
scheduler = get_cosine_schedule_with_warmup(optimizer,
num_warmup_steps=10,
num_training_steps=epochs)
early_stop_counter = 0
early_stop_limit = config['early_stop']
best_model_wts = copy.deepcopy(model.state_dict())
best_loss = np.inf
for _ in trange(epochs, leave=False):
loss, accuracy = train_loop(model, train_dataloader, optimizer,
device, len(train_dataset), scale)
if scheduler is not None:
scheduler.step()
if loss >= best_loss:
early_stop_counter += 1
else:
best_model_wts = copy.deepcopy(model.state_dict())
early_stop_counter = 0
best_loss = loss
if early_stop_counter == early_stop_limit:
break
model.load_state_dict(best_model_wts)
_, _, y_pred, y_true, conf = eval_loop(model, test_dataloader, device,
len(test_dataset), scale)
m = gr_metrics(y_pred, y_true)
if 'Precision' in metrics_dict:
metrics_dict['Precision'].append(m[0])
metrics_dict['Recall'].append(m[1])
metrics_dict['FScore'].append(m[2])
metrics_dict['OE'].append(m[3])
metrics_dict['all'].append([y_pred, y_true])
else:
metrics_dict['Precision'] = [m[0]]
metrics_dict['Recall'] = [m[1]]
metrics_dict['FScore'] = [m[2]]
metrics_dict['OE'] = [m[3]]
metrics_dict['all'] = [[y_pred, y_true]]
df = pd.DataFrame(metrics_dict)
df.to_csv(f'{datetime.now().__format__("%d%m%y_%H%M%S")}_df.csv')
return df['FScore'].median()
def generate( # pylint: disable=W0221
self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
target_label: Optional[Union[int, List[int], np.ndarray]] = None,
**kwargs) -> np.ndarray:
"""
Generate DPatch.
:param x: Sample images.
:param y: Target labels for object detector.
:param target_label: The target label of the DPatch attack.
:param mask: An boolean array of shape equal to the shape of a single samples (1, H, W) or the shape of `x`
(N, H, W) without their channel dimensions. Any features for which the mask is True can be the
center location of the patch during sampling.
:type mask: `np.ndarray`
:return: Adversarial patch.
"""
mask = kwargs.get("mask")
if mask is not None:
mask = mask.copy()
if mask is not None and (mask.dtype != np.bool or not (
mask.shape[0] == 1 or mask.shape[0] == x.shape[0]
) or not (
(mask.shape[1] == x.shape[1] and mask.shape[2] == x.shape[2]) or
(mask.shape[1] == x.shape[2] and mask.shape[2] == x.shape[3]))):
raise ValueError(
"The shape of `mask` has to be equal to the shape of a single samples (1, H, W) or the"
"shape of `x` (N, H, W) without their channel dimensions.")
channel_index = 1 if self.estimator.channels_first else x.ndim - 1
if x.shape[channel_index] != self.patch_shape[channel_index - 1]:
raise ValueError(
"The color channel index of the images and the patch have to be identical."
)
if y is not None:
raise ValueError("The DPatch attack does not use target labels.")
if x.ndim != 4:
raise ValueError(
"The adversarial patch can only be applied to images.")
if target_label is not None:
if isinstance(target_label, int):
self.target_label = [target_label] * x.shape[0]
elif isinstance(target_label, np.ndarray):
if not (target_label.shape == (x.shape[0], 1)
or target_label.shape == (x.shape[0], )):
raise ValueError(
"The target_label has to be a 1-dimensional array.")
self.target_label = target_label.tolist()
else:
if not len(target_label) == x.shape[0] or not isinstance(
target_label, list):
raise ValueError(
"The target_label as list of integers needs to of length number of images in `x`."
)
self.target_label = target_label
patched_images, transforms = self._augment_images_with_patch(
x,
self._patch,
random_location=True,
channels_first=self.estimator.channels_first,
mask=mask,
transforms=None,
)
patch_target: List[Dict[str, np.ndarray]] = list()
if self.target_label:
for i_image in range(patched_images.shape[0]):
if isinstance(self.target_label, int):
t_l = self.target_label
else:
t_l = self.target_label[i_image]
i_x_1 = transforms[i_image]["i_x_1"]
i_x_2 = transforms[i_image]["i_x_2"]
i_y_1 = transforms[i_image]["i_y_1"]
i_y_2 = transforms[i_image]["i_y_2"]
target_dict = dict()
target_dict["boxes"] = np.asarray(
[[i_x_1, i_y_1, i_x_2, i_y_2]])
target_dict["labels"] = np.asarray([
t_l,
])
target_dict["scores"] = np.asarray([
1.0,
])
patch_target.append(target_dict)
else:
predictions = self.estimator.predict(x=patched_images)
for i_image in range(patched_images.shape[0]):
target_dict = dict()
target_dict["boxes"] = predictions[i_image]["boxes"]
target_dict["labels"] = predictions[i_image]["labels"]
target_dict["scores"] = predictions[i_image]["scores"]
patch_target.append(target_dict)
for i_step in trange(self.max_iter,
desc="DPatch iteration",
disable=not self.verbose):
if i_step == 0 or (i_step + 1) % 100 == 0:
logger.info("Training Step: %i", i_step + 1)
num_batches = math.ceil(x.shape[0] / self.batch_size)
patch_gradients = np.zeros_like(self._patch)
for i_batch in range(num_batches):
i_batch_start = i_batch * self.batch_size
i_batch_end = min((i_batch + 1) * self.batch_size,
patched_images.shape[0])
gradients = self.estimator.loss_gradient(
x=patched_images[i_batch_start:i_batch_end],
y=patch_target[i_batch_start:i_batch_end],
)
for i_image in range(gradients.shape[0]):
i_x_1 = transforms[i_batch_start + i_image]["i_x_1"]
i_x_2 = transforms[i_batch_start + i_image]["i_x_2"]
i_y_1 = transforms[i_batch_start + i_image]["i_y_1"]
i_y_2 = transforms[i_batch_start + i_image]["i_y_2"]
if self.estimator.channels_first:
patch_gradients_i = gradients[i_image, :, i_x_1:i_x_2,
i_y_1:i_y_2]
else:
patch_gradients_i = gradients[i_image, i_x_1:i_x_2,
i_y_1:i_y_2, :]
patch_gradients = patch_gradients + patch_gradients_i
if self.target_label:
self._patch = self._patch - np.sign(
patch_gradients) * self.learning_rate
else:
self._patch = self._patch + np.sign(
patch_gradients) * self.learning_rate
if self.estimator.clip_values is not None:
self._patch = np.clip(
self._patch,
a_min=self.estimator.clip_values[0],
a_max=self.estimator.clip_values[1],
)
patched_images, _ = self._augment_images_with_patch(
x,
self._patch,
random_location=False,
channels_first=self.estimator.channels_first,
mask=None,
transforms=transforms,
)
return self._patch
# Create worker processes
print(" - Creating worker processes")
ps = [
Process(target=worker, args=(inQueue, outQueue))
for _ in range(njobs)
]
# Start worker processes
print(" - Starting worker processes")
for p in ps:
p.start()
# Fill the queue
print(" - Filling up the queue")
for i in trange(ncases):
inQueue.put((i))
# Now running the processes
print(" - Running the processes")
output = [outQueue.get() for _ in trange(ncases)]
# Send stop signal to stop iteration
for _ in range(njobs):
inQueue.put('STOP')
# Stop processes
print(" - Stopping processes")
for p in ps:
p.join()
def generate(self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
**kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs to be attacked.
:param y: An array with the original labels to be predicted.
:return: An array holding the adversarial examples.
"""
x_adv = x.astype(ART_NUMPY_DTYPE)
preds = self.estimator.predict(x_adv, batch_size=self.batch_size)
if (preds < 0.0).any() or (preds > 1.0).any():
raise TypeError(
"This attack requires a classifier predicting probabilities in the range [0, 1] as output."
"Values smaller than 0.0 or larger than 1.0 have been detected."
)
# preds_rescaled = self._rescale(preds) # Rescaling needs more testing
preds_rescaled = preds
# Compute perturbation with implicit batching
for batch_id in trange(int(
np.ceil(x_adv.shape[0] / float(self.batch_size))),
desc="VAT",
disable=not self.verbose):
batch_index_1, batch_index_2 = batch_id * self.batch_size, (
batch_id + 1) * self.batch_size
batch = x_adv[batch_index_1:batch_index_2]
batch = batch.reshape((batch.shape[0], -1))
# Main algorithm for each batch
var_d = np.random.randn(*batch.shape).astype(ART_NUMPY_DTYPE)
# Main loop of the algorithm
for _ in range(self.max_iter):
var_d = self._normalize(var_d)
preds_new = self.estimator.predict(
(batch + var_d).reshape((-1, ) +
self.estimator.input_shape))
if (preds_new < 0.0).any() or (preds_new > 1.0).any():
raise TypeError(
"This attack requires a classifier predicting probabilities in the range [0, 1] as "
"output. Values smaller than 0.0 or larger than 1.0 have been detected."
)
# preds_new_rescaled = self._rescale(preds_new) # Rescaling needs more testing
preds_new_rescaled = preds_new
from scipy.stats import entropy
kl_div1 = entropy(
np.transpose(preds_rescaled[batch_index_1:batch_index_2]),
np.transpose(preds_new_rescaled),
)
var_d_new = np.zeros(var_d.shape).astype(ART_NUMPY_DTYPE)
for current_index in range(var_d.shape[1]):
var_d[:, current_index] += self.finite_diff
preds_new = self.estimator.predict(
(batch + var_d).reshape((-1, ) +
self.estimator.input_shape))
if (preds_new < 0.0).any() or (preds_new > 1.0).any():
raise TypeError(
"This attack requires a classifier predicting probabilities in the range [0, 1]"
"as output. Values smaller than 0.0 or larger than 1.0 have been detected."
)
# preds_new_rescaled = self._rescale(preds_new) # Rescaling needs more testing
preds_new_rescaled = preds_new
kl_div2 = entropy(
np.transpose(
preds_rescaled[batch_index_1:batch_index_2]),
np.transpose(preds_new_rescaled),
)
var_d_new[:, current_index] = (kl_div2 -
kl_div1) / self.finite_diff
var_d[:, current_index] -= self.finite_diff
var_d = var_d_new
# Apply perturbation and clip
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
x_adv[batch_index_1:batch_index_2] = np.clip(
batch + self.eps * self._normalize(var_d), clip_min,
clip_max).reshape((-1, ) + self.estimator.input_shape)
else:
x_adv[batch_index_1:batch_index_2] = (
batch + self.eps * self._normalize(var_d)
).reshape((-1, ) + self.estimator.input_shape)
logger.info(
"Success rate of virtual adversarial attack: %.2f%%",
100 * compute_success(
self.estimator, x, y, x_adv, batch_size=self.batch_size),
)
return x_adv
int(steps_per_epoch * args.num_epochs * 5 / 6)
],
values=[
args.initial_lr, args.initial_lr * 0.1,
args.initial_lr * 0.01
])
optimizer = tf.keras.optimizers.SGD(learning_rate=lr_fn,
momentum=args.momentum)
train_log_dir = 'logs/train'
val_log_dir = 'logs/val'
train_summary_writer = tf.summary.create_file_writer(train_log_dir)
val_summary_writer = tf.summary.create_file_writer(val_log_dir)
for epoch in trange(args.num_epochs, desc='Epoch'):
avg_loss = 0.0
avg_conf_loss = 0.0
avg_loc_loss = 0.0
start = time.time()
for i, (_, imgs, gt_confs, gt_locs) in tqdm(enumerate(batch_generator),
desc='Steps',
total=steps_per_epoch):
loss, conf_loss, loc_loss, l2_loss = train_step(
imgs, gt_confs, gt_locs, ssd, criterion, optimizer)
avg_loss = (avg_loss * i + loss.numpy()) / (i + 1)
avg_conf_loss = (avg_conf_loss * i + conf_loss.numpy()) / (i + 1)
avg_loc_loss = (avg_loc_loss * i + loc_loss.numpy()) / (i + 1)
if (i + 1) % 10 == 0:
tqdm.write(
)
anchors_total = sum(
not (len(a["wikidata_ids"]) == 0 and a["wikidata_src"] == "simple")
for page in wiki.values()
for a in page["anchors"]
)
logging.info(
"LANG: {} -- Solved {:.2%} of anchors".format(
lang, anchors_solved / anchors_total
)
)
elif args.step == "prepare":
for lang in args.langs.split("|"):
results = {}
for rank in trange(32):
filename = os.path.join(
args.base_wikipedia,
"{}".format(lang),
"{}wiki{}.pkl".format(lang, rank),
)
if os.path.exists(filename):
logging.info("Loading {}".format(filename))
with open(filename, "rb") as f:
for k, v in pickle.load(f).items():
results[k] = v
filename = os.path.join(
args.base_wikipedia,
"{}".format(lang),
"{}wiki.pkl".format(lang),
def generate(self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
**kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs.
:param y: An array with the original labels to be predicted.
:return: An array holding the adversarial examples.
"""
if len(x.shape) < 3: # pragma: no cover
raise ValueError(
"Frame saliency attack works only on inputs of dimension greater than 2."
)
if self.frame_index >= len(x.shape): # pragma: no cover
raise ValueError(
"Frame index is out of bounds for the given input shape.")
if y is not None:
y = check_and_transform_label_format(
y, nb_classes=self.estimator.nb_classes)
if self.method == "one_shot":
if y is None:
return self.attacker.generate(x)
return self.attacker.generate(x, y)
if y is None:
# Throw error if attack is targeted, but no targets are provided
if hasattr(
self.attacker, "targeted"
) and self.attacker.targeted: # type: ignore # pragma: no cover
raise ValueError(
"Target labels `y` need to be provided for a targeted attack."
)
# Use model predictions as correct outputs
targets = get_labels_np_array(
self.estimator.predict(x, batch_size=self.batch_size))
else:
targets = y
if self.estimator.nb_classes == 2 and targets.shape[
1] == 1: # pragma: no cover
raise ValueError(
"This attack has not yet been tested for binary classification with a single output classifier."
)
nb_samples = x.shape[0]
nb_frames = x.shape[self.frame_index]
x_adv = x.astype(ART_NUMPY_DTYPE)
# Determine for which adversarial examples the attack fails:
attack_failure = self._compute_attack_failure_array(x, targets, x_adv)
# Determine the order in which to perturb frames, based on saliency scores:
frames_to_perturb = self._compute_frames_to_perturb(x_adv, targets)
# Generate adversarial perturbations. If the method is "iterative_saliency_refresh", we will use a mask so that
# only the next frame to be perturbed is considered in the attack; moreover we keep track of the next frames to
# be perturbed so they will not be perturbed again later on.
mask = np.ones(x.shape)
if self.method == "iterative_saliency_refresh":
mask = np.zeros(x.shape)
mask = np.swapaxes(mask, 1, self.frame_index)
mask[:, frames_to_perturb[:, 0], ::] = 1
mask = np.swapaxes(mask, 1, self.frame_index)
disregard = np.zeros((nb_samples, nb_frames))
disregard[:, frames_to_perturb[:, 0]] = np.inf
x_adv_new = self.attacker.generate(x, targets, mask=mask)
# Here starts the main iteration:
for i in trange(nb_frames,
desc="Frame saliency",
disable=not self.verbose):
# Check if attack has already succeeded for all inputs:
if sum(attack_failure) == 0:
break
# Update designated frames with adversarial perturbations:
x_adv = np.swapaxes(x_adv, 1, self.frame_index)
x_adv_new = np.swapaxes(x_adv_new, 1, self.frame_index)
x_adv[attack_failure,
frames_to_perturb[:, i][attack_failure], ::] = x_adv_new[
attack_failure, frames_to_perturb[:,
i][attack_failure], ::]
x_adv = np.swapaxes(x_adv, 1, self.frame_index)
x_adv_new = np.swapaxes(x_adv_new, 1, self.frame_index)
# Update for which adversarial examples the attack still fails:
attack_failure = self._compute_attack_failure_array(
x, targets, x_adv)
# For the "refresh" method, update the next frames to be perturbed (disregarding the frames that were
# perturbed already) and also refresh the adversarial perturbations:
if self.method == "iterative_saliency_refresh" and i < nb_frames - 1:
frames_to_perturb = self._compute_frames_to_perturb(
x_adv, targets, disregard)
mask = np.zeros(x.shape)
mask = np.swapaxes(mask, 1, self.frame_index)
mask[:, frames_to_perturb[:, i + 1], ::] = 1
mask = np.swapaxes(mask, 1, self.frame_index)
disregard[:, frames_to_perturb[:, i + 1]] = np.inf
x_adv_new = self.attacker.generate(x_adv, targets, mask=mask)
return x_adv
def generate(self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
**kwargs) -> np.ndarray:
"""
Generate adversarial examples and return them as an array.
:param x: An array with the original inputs to be attacked.
:param y: Target values (class labels) one-hot-encoded of shape (nb_samples, nb_classes) or indices of shape
(nb_samples,).
:return: An array holding the adversarial examples.
"""
if y is not None:
y = check_and_transform_label_format(y,
self.estimator.nb_classes,
return_one_hot=False)
x_adv = x.copy()
for index in trange(x_adv.shape[0],
desc="Decision tree attack",
disable=not self.verbose):
path = self.estimator.get_decision_path(x_adv[index])
legitimate_class = int(
np.argmax(self.estimator.predict(x_adv[index].reshape(1, -1))))
position = -2
adv_path = [-1]
ancestor = path[position]
while np.abs(position) < (len(path) - 1) or adv_path[0] == -1:
ancestor = path[position]
current_child = path[position + 1]
# search in right subtree
if current_child == self.estimator.get_left_child(ancestor):
if y is None:
adv_path = self._df_subtree(
self.estimator.get_right_child(ancestor),
legitimate_class)
else:
adv_path = self._df_subtree(
self.estimator.get_right_child(ancestor),
legitimate_class,
y[index],
)
else: # search in left subtree
if y is None:
adv_path = self._df_subtree(
self.estimator.get_left_child(ancestor),
legitimate_class)
else:
adv_path = self._df_subtree(
self.estimator.get_left_child(ancestor),
legitimate_class,
y[index],
)
position = position - 1 # we are going the decision path upwards
adv_path.append(ancestor)
# we figured out which is the way to the target, now perturb
# first one is leaf-> no threshold, cannot be perturbed
for i in range(1, 1 + len(adv_path[1:])):
go_for = adv_path[i - 1]
threshold = self.estimator.get_threshold_at_node(adv_path[i])
feature = self.estimator.get_feature_at_node(adv_path[i])
# only perturb if the feature is actually wrong
if x_adv[index][
feature] > threshold and go_for == self.estimator.get_left_child(
adv_path[i]):
x_adv[index][feature] = threshold - self.offset
elif x_adv[index][
feature] <= threshold and go_for == self.estimator.get_right_child(
adv_path[i]):
x_adv[index][feature] = threshold + self.offset
return x_adv
def _fit_cdr(self):
import tensorflow as tf
from .model import Model
n_users = self.train_set.num_users
n_items = self.train_set.num_items
text_feature = self.train_set.item_text.batch_bow(
np.arange(n_items)) # bag of word feature
text_feature = (text_feature - text_feature.min()) / (
text_feature.max() - text_feature.min()) # normalization
# Build model
layer_sizes = ([self.vocab_size] + self.autoencoder_structure +
[self.k] + self.autoencoder_structure +
[self.vocab_size])
tf.set_random_seed(self.seed)
model = Model(
n_users=n_users,
n_items=n_items,
n_vocab=self.vocab_size,
k=self.k,
layers=layer_sizes,
lambda_u=self.lambda_u,
lambda_v=self.lambda_v,
lambda_w=self.lambda_w,
lambda_n=self.lambda_n,
lr=self.learning_rate,
dropout_rate=self.dropout_rate,
U=self.U,
V=self.V,
act_fn=self.act_fn,
seed=self.seed,
)
# Training model
config = tf.ConfigProto()
config.gpu_options.allow_growth = True
with tf.Session(config=config) as sess:
sess.run(tf.global_variables_initializer())
loop = trange(self.max_iter, disable=not self.verbose)
for _ in loop:
corruption_mask = self.rng.binomial(1,
1 - self.corruption_rate,
(n_items, self.vocab_size))
sum_loss = 0
count = 0
batch_count = 0
for batch_u, batch_i, batch_j in self.train_set.uij_iter(
batch_size=self.batch_size, shuffle=True):
feed_dict = {
model.mask_input: corruption_mask[batch_i, :],
model.text_input: text_feature[batch_i, :],
model.batch_u: batch_u,
model.batch_i: batch_i,
model.batch_j: batch_j,
}
sess.run(model.opt1, feed_dict) # train U, V
_, _loss = sess.run([model.opt2, model.loss],
feed_dict) # train SDAE
sum_loss += _loss
count += len(batch_u)
batch_count += 1
if batch_count % 10 == 0:
loop.set_postfix(loss=(sum_loss / count))
self.U, self.V = sess.run([model.U, model.V])
tf.reset_default_graph()
if self.verbose:
print("\nLearning completed")
def generate(self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
**kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs to be attacked.
:param y: Target values (class labels) one-hot-encoded of shape (nb_samples, nb_classes) or indices of shape
(nb_samples,).
:return: An array holding the adversarial examples.
"""
y = check_and_transform_label_format(y, self.estimator.nb_classes)
# Check that `y` is provided for targeted attacks
if self.targeted and y is None: # pragma: no cover
raise ValueError(
"Target labels `y` need to be provided for a targeted attack.")
# No labels provided, use model prediction as correct class
if y is None:
y = get_labels_np_array(
self.estimator.predict(x, batch_size=self.batch_size))
if self.estimator.nb_classes == 2 and y.shape[
1] == 1: # pragma: no cover
raise ValueError(
"This attack has not yet been tested for binary classification with a single output classifier."
)
# Compute adversarial examples with implicit batching
nb_batches = int(np.ceil(x.shape[0] / float(self.batch_size)))
x_adv = []
for batch_id in trange(nb_batches,
desc="ZOO",
disable=not self.verbose):
batch_index_1, batch_index_2 = batch_id * self.batch_size, (
batch_id + 1) * self.batch_size
x_batch = x[batch_index_1:batch_index_2]
y_batch = y[batch_index_1:batch_index_2]
res = self._generate_batch(x_batch, y_batch)
x_adv.append(res)
x_adv = np.vstack(x_adv)
# Apply clip
if self.estimator.clip_values is not None:
clip_min, clip_max = self.estimator.clip_values
np.clip(x_adv, clip_min, clip_max, out=x_adv)
# Log success rate of the ZOO attack
logger.info(
"Success rate of ZOO attack: %.2f%%",
100 * compute_success(self.estimator,
x,
y,
x_adv,
self.targeted,
batch_size=self.batch_size),
)
return x_adv
def predict_gender(audios, intervals, complex):
step_seconds = 0.04
model_path = 'model/weights/max_pooling__n_layers=7__n_filters=64__downsampling=1__n_seconds=3.torch'
model_type = model_path.split('/')[-1].split('__')[0]
model_name = model_path.split('/')[-1].split('.')[0]
model_params = {
i.split('=')[0]: float(i.split('=')[1])
for i in model_name.split('__')[1:]
}
# Here we assume that the model was trained on the LibriSpeech dataset
model_sampling_rate = LIBRISPEECH_SAMPLING_RATE / model_params[
'downsampling']
model_num_samples = int(model_params['n_seconds'] * model_sampling_rate)
if model_type == 'max_pooling':
model = ConvNet(int(model_params['n_filters']),
int(model_params['n_layers']))
elif model_type == 'dilated':
model = DilatedNet(int(model_params['n_filters']),
int(model_params['n_depth']),
int(model_params['n_stacks']))
else:
raise (ValueError, 'Model type not recognised.')
model.load_state_dict(torch.load(model_path))
model.double()
model.cuda()
model.eval()
for i in trange(len(audios), desc="speakers"):
speaker = audios[i].replace('.wav', '')
##############
# Load audio #
##############
audio_path = PATH + '/raw/voc/simple_audio/' + audios[i]
audio, audio_sampling_rate = sf.read(audio_path)
audio_duration_seconds = audio.shape[0] * 1. / audio_sampling_rate
audio_duration_minutes = audio_duration_seconds / 60.
step_samples = int(step_seconds * model_sampling_rate)
step_samples_at_audio_rate = int(step_seconds * audio_sampling_rate)
default_shape = None
batch = []
start_min = []
pred = []
mean_pitch = []
max_pitch = []
min_pitch = []
num_zeros = []
std_pitch = []
pitch_measurements = []
for j in trange(len(intervals[speaker]), desc="intervals",
leave=False):
start = float(intervals[speaker][j][0])
end = float(intervals[speaker][j][1])
start_samples = int(audio_sampling_rate * start)
end_samples = int(audio_sampling_rate * end)
step_samples = int(step_seconds * model_sampling_rate)
step_samples_at_audio_rate = int(step_seconds *
audio_sampling_rate)
default_shape = None
for lower in tqdm(range(start_samples, end_samples,
step_samples_at_audio_rate),
desc="predictions",
leave=False):
x = audio[lower:lower + (3 * audio_sampling_rate)]
if x.shape[0] != 3 * audio_sampling_rate:
break
sf.write(PATH + '/raw/clips/{}.wav'.format(speaker), x,
audio_sampling_rate)
sound = parselmouth.Sound(PATH +
'/raw/clips/{}.wav'.format(speaker))
pitch = sound.to_pitch()
pitch_values = pitch.selected_array['frequency']
if pitch_values[pitch_values != 0].size != 0:
mean_pitch.append(np.mean(pitch_values[pitch_values != 0]))
std_pitch.append(np.std(pitch_values[pitch_values != 0]))
min_pitch.append(np.amin(pitch_values[pitch_values != 0]))
max_pitch.append(np.amax(pitch_values[pitch_values != 0]))
num_zeros.append(pitch_values[pitch_values == 0].size)
pitch_measurements.append(
pitch_values[pitch_values != 0].size)
start_min.append(lower / 44100.)
else:
mean_pitch.append(0)
std_pitch.append(0)
min_pitch.append(0)
max_pitch.append(0)
num_zeros.append(pitch_values[pitch_values == 0].size)
pitch_measurements.append(0)
start_min.append(lower / 44100.)
os.remove(PATH + '/raw/clips/{}.wav'.format(speaker))
x = torch.from_numpy(x).reshape(1, -1)
x = whiten(x)
# For me the bottleneck is this scipy resample call, increasing batch size doesn't make it any faster
x = torch.from_numpy(resample(x, model_num_samples,
axis=1)).reshape(
(1, 1, model_num_samples))
y_hat = model(x).item()
pred.append(y_hat)
start_min.append(lower / 44100.)
df = pd.DataFrame(
data={
'speaker': speaker,
'start_second': start_min,
'p': pred,
'mean_pitch': mean_pitch,
'max_pitch': max_pitch,
'min_pitch': min_pitch,
'num_zeros': num_zeros,
'std_pitch': std_pitch,
'pitch_measurements': pitch_measurements
})
df = df.assign(
# Time in seconds of the end of the prediction fragment
t_end=df['start_second'] + model_params['n_seconds'] / 60,
# Time in seconds of the center of the prediction fragment
t_center=df['start_second'] * 60 + model_params['n_seconds'] / 2.)
df.to_csv(PATH + 'analyses/results/results_for_' + speaker + '.csv',
index=False)
def main():
init_output_dir(output_dir)
# prepare dataset
task = get_task(task_name, dataset_path)
label_list = task.get_labels()
label_map = {v: i for i, v in enumerate(label_list)}
print("loading raw data ... ")
train_examples = task.get_train_examples()
val_examples = task.get_dev_examples()
test_examples = task.get_test_examples()
print("converting to data loader ... ")
train_loader = get_dataloader(train_examples, label_map)
val_loader = get_dataloader(val_examples, label_map)
test_loader = get_dataloader(test_examples, label_map)
# load model
print("loading model ... ")
model = InferSent(config)
model.load_state_dict(torch.load(model_path))
model = model.cuda() if config['use_cuda'] else model
model.set_w2v_path(word_emb_path)
print("building model vocabs ... ")
model.build_vocab_k_words(K=100000, verbose=True)
# run embedding for train set
print("Run embedding for train set")
for _ in trange(1, desc="Epoch"):
run_encoding(loader=train_loader,
model=model,
mode='train')
print("Run embedding for dev set")
for _ in trange(1, desc="Epoch"):
run_encoding(loader=val_loader,
model=model,
mode='dev')
print("Run embedding for test set")
for _ in trange(1, desc="Epoch"):
run_encoding(loader=test_loader,
model=model,
mode='test')
# HACK FOR MNLI mis-matched
if task_name == 'mnli':
print("Run Embedding for MNLI Mis-Matched Datasets")
print("loading raw data ... ")
mm_val_example = MnliMismatchedProcessor().get_dev_examples(dataset_path)
mm_test_examples = MnliMismatchedProcessor().get_test_examples(dataset_path)
print("converting to data loader ... ")
mm_val_loader = get_dataloader(mm_val_example, label_map)
mm_test_loader = get_dataloader(mm_test_examples, label_map)
print("Run embedding for mm_dev set")
for _ in trange(1, desc="Epoch"):
run_encoding(loader=mm_val_loader,
model=model,
mode='mm_dev')
print("Run embedding for test set")
for _ in trange(1, desc="Epoch"):
run_encoding(loader=mm_test_loader,
model=model,
mode='mm_test')
def train(
self,
train_dataset,
output_dir,
multi_label=False,
show_running_loss=True,
eval_df=None,
verbose=True,
**kwargs,
):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
device = self.device
model = self.model
args = self.args
tb_writer = SummaryWriter(logdir=args["tensorboard_dir"])
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(train_dataset, sampler=train_sampler, batch_size=args["train_batch_size"])
t_total = len(train_dataloader) // args["gradient_accumulation_steps"] * args["num_train_epochs"]
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [
{
"params": [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)],
"weight_decay": args["weight_decay"],
},
{
"params": [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)],
"weight_decay": 0.0,
},
]
warmup_steps = math.ceil(t_total * args["warmup_ratio"])
args["warmup_steps"] = warmup_steps if args["warmup_steps"] == 0 else args["warmup_steps"]
optimizer = AdamW(optimizer_grouped_parameters, lr=args["learning_rate"], eps=args["adam_epsilon"])
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=args["warmup_steps"], num_training_steps=t_total
)
if args["fp16"]:
try:
from apex import amp
except ImportError:
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=args["fp16_opt_level"])
if args["n_gpu"] > 1:
model = torch.nn.DataParallel(model)
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args["num_train_epochs"]), desc="Epoch", disable=args["silent"])
epoch_number = 0
best_eval_loss = None
early_stopping_counter = 0
if args["evaluate_during_training"]:
training_progress_scores = self._create_training_progress_scores(multi_label, **kwargs)
if args["wandb_project"]:
wandb.init(project=args["wandb_project"], config={**args}, **args["wandb_kwargs"])
wandb.watch(self.model)
model.train()
for _ in train_iterator:
# epoch_iterator = tqdm(train_dataloader, desc="Iteration")
for step, batch in enumerate(tqdm(train_dataloader, desc="Current iteration", disable=args["silent"])):
batch = tuple(t.to(device) for t in batch)
inputs = self._get_inputs_dict(batch)
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
if args["n_gpu"] > 1:
loss = loss.mean() # mean() to average on multi-gpu parallel training
current_loss = loss.item()
if show_running_loss:
print("\rRunning loss: %f" % loss, end="")
if args["gradient_accumulation_steps"] > 1:
loss = loss / args["gradient_accumulation_steps"]
if args["fp16"]:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
# torch.nn.utils.clip_grad_norm_(
# amp.master_params(optimizer), args["max_grad_norm"]
# )
else:
loss.backward()
# torch.nn.utils.clip_grad_norm_(
# model.parameters(), args["max_grad_norm"]
# )
tr_loss += loss.item()
if (step + 1) % args["gradient_accumulation_steps"] == 0:
if args["fp16"]:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args["max_grad_norm"])
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), args["max_grad_norm"])
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args["logging_steps"] > 0 and global_step % args["logging_steps"] == 0:
# Log metrics
tb_writer.add_scalar("lr", scheduler.get_lr()[0], global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) / args["logging_steps"], global_step)
logging_loss = tr_loss
if args["wandb_project"]:
wandb.log(
{
"Training loss": current_loss,
"lr": scheduler.get_lr()[0],
"global_step": global_step,
}
)
if args["save_steps"] > 0 and global_step % args["save_steps"] == 0:
# Save model checkpoint
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
self._save_model(output_dir_current, model=model)
if args["evaluate_during_training"] and (
args["evaluate_during_training_steps"] > 0
and global_step % args["evaluate_during_training_steps"] == 0
):
# Only evaluate when single GPU otherwise metrics may not average well
results, _, _ = self.eval_model(
eval_df, verbose=verbose and args["evaluate_during_training_verbose"], silent=True, **kwargs
)
for key, value in results.items():
tb_writer.add_scalar("eval_{}".format(key), value, global_step)
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
if args["save_eval_checkpoints"]:
self._save_model(output_dir_current, model=model, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(
args["output_dir"] + "training_progress_scores.csv", index=False,
)
if args["wandb_project"]:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_loss:
best_eval_loss = results["eval_loss"]
self._save_model(args["best_model_dir"], model=model, results=results)
elif results["eval_loss"] - best_eval_loss < args["early_stopping_delta"]:
best_eval_loss = results["eval_loss"]
self._save_model(args["best_model_dir"], model=model, results=results)
early_stopping_counter = 0
else:
if early_stopping_counter < args["early_stopping_patience"]:
early_stopping_counter += 1
if verbose:
print()
print(f"No improvement in eval_loss for {early_stopping_counter} steps.")
print(f"Training will stop at {args['early_stopping_patience']} steps.")
print()
else:
if verbose:
print()
print(f"Patience of {args['early_stopping_patience']} steps reached.")
print("Training terminated.")
print()
return global_step, tr_loss / global_step
epoch_number += 1
output_dir_current = os.path.join(output_dir, "checkpoint-{}-epoch-{}".format(global_step, epoch_number))
if (args["save_model_every_epoch"] or args["evaluate_during_training"]) and not os.path.exists(
output_dir_current
):
os.makedirs(output_dir_current)
if args["save_model_every_epoch"]:
self._save_model(output_dir_current, model=model)
if args["evaluate_during_training"]:
results, _, _ = self.eval_model(
eval_df, verbose=verbose and args["evaluate_during_training_verbose"], silent=True, **kwargs
)
self._save_model(output_dir_current, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(args["output_dir"] + "training_progress_scores.csv", index=False)
return global_step, tr_loss / global_step
def train(args, train_dataset, model: PreTrainedModel,
tokenizer: PreTrainedTokenizer) -> Tuple[int, float]:
""" Train the model """
if args.local_rank in [-1, 0]:
tb_writer = SummaryWriter()
args.train_batch_size = args.per_gpu_train_batch_size * max(1, args.n_gpu)
def collate(examples: List[torch.Tensor]):
if tokenizer._pad_token is None:
return pad_sequence(examples, batch_first=True)
return pad_sequence(examples,
batch_first=True,
padding_value=tokenizer.pad_token_id)
train_sampler = RandomSampler(
train_dataset) if args.local_rank == -1 else DistributedSampler(
train_dataset)
train_dataloader = DataLoader(train_dataset,
sampler=train_sampler,
batch_size=args.train_batch_size,
collate_fn=collate)
if args.max_steps > 0:
t_total = args.max_steps
args.num_train_epochs = args.max_steps // (
len(train_dataloader) // args.gradient_accumulation_steps) + 1
else:
t_total = len(
train_dataloader
) // args.gradient_accumulation_steps * args.num_train_epochs
# Prepare optimizer and schedule (linear warmup and decay)
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [
{
"params": [
p for n, p in model.named_parameters()
if not any(nd in n for nd in no_decay)
],
"weight_decay":
args.weight_decay,
},
{
"params": [
p for n, p in model.named_parameters()
if any(nd in n for nd in no_decay)
],
"weight_decay":
0.0
},
]
optimizer = AdamW(optimizer_grouped_parameters,
lr=args.learning_rate,
eps=args.adam_epsilon)
scheduler = get_linear_schedule_with_warmup(
optimizer,
num_warmup_steps=args.warmup_steps,
num_training_steps=t_total)
# Check if saved optimizer or scheduler states exist
if (args.model_name_or_path and os.path.isfile(
os.path.join(args.model_name_or_path, "optimizer.pt"))
and os.path.isfile(
os.path.join(args.model_name_or_path, "scheduler.pt"))):
# Load in optimizer and scheduler states
optimizer.load_state_dict(
torch.load(os.path.join(args.model_name_or_path, "optimizer.pt")))
scheduler.load_state_dict(
torch.load(os.path.join(args.model_name_or_path, "scheduler.pt")))
if args.fp16:
try:
from apex import amp
except ImportError:
raise ImportError(
"Please install apex from https://www.github.com/nvidia/apex to use fp16 training."
)
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args.fp16_opt_level)
# multi-gpu training (should be after apex fp16 initialization)
if args.n_gpu > 1:
model = torch.nn.DataParallel(model)
# Distributed training (should be after apex fp16 initialization)
if args.local_rank != -1:
model = torch.nn.parallel.DistributedDataParallel(
model,
device_ids=[args.local_rank],
output_device=args.local_rank,
find_unused_parameters=True)
# Train!
logger.info("***** Running training *****")
logger.info(" Num examples = %d", len(train_dataset))
logger.info(" Num Epochs = %d", args.num_train_epochs)
logger.info(" Instantaneous batch size per GPU = %d",
args.per_gpu_train_batch_size)
logger.info(
" Total train batch size (w. parallel, distributed & accumulation) = %d",
args.train_batch_size * args.gradient_accumulation_steps *
(torch.distributed.get_world_size() if args.local_rank != -1 else 1),
)
logger.info(" Gradient Accumulation steps = %d",
args.gradient_accumulation_steps)
logger.info(" Total optimization steps = %d", t_total)
global_step = 0
epochs_trained = 0
steps_trained_in_current_epoch = 0
# Check if continuing training from a checkpoint
if args.model_name_or_path and os.path.exists(args.model_name_or_path):
try:
# set global_step to gobal_step of last saved checkpoint from model path
checkpoint_suffix = args.model_name_or_path.split("-")[-1].split(
"/")[0]
global_step = int(checkpoint_suffix)
epochs_trained = global_step // (len(train_dataloader) //
args.gradient_accumulation_steps)
steps_trained_in_current_epoch = global_step % (
len(train_dataloader) // args.gradient_accumulation_steps)
logger.info(
" Continuing training from checkpoint, will skip to saved global_step"
)
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d",
global_step)
logger.info(" Will skip the first %d steps in the first epoch",
steps_trained_in_current_epoch)
except ValueError:
logger.info(" Starting fine-tuning.")
tr_loss, logging_loss = 0.0, 0.0
model_to_resize = model.module if hasattr(
model,
"module") else model # Take care of distributed/parallel training
model_to_resize.resize_token_embeddings(len(tokenizer))
model.zero_grad()
train_iterator = trange(epochs_trained,
int(args.num_train_epochs),
desc="Epoch",
disable=args.local_rank not in [-1, 0])
set_seed(args) # Added here for reproducibility
for _ in train_iterator:
epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=True)
for step, batch in enumerate(epoch_iterator):
# Skip past any already trained steps if resuming training
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
inputs, labels = mask_tokens(batch, tokenizer,
args) if args.mlm else (batch, batch)
inputs = inputs.to(args.device)
labels = labels.to(args.device)
model.train()
outputs = model(inputs,
masked_lm_labels=labels) if args.mlm else model(
inputs, labels=labels)
loss = outputs[
0] # model outputs are always tuple in transformers (see doc)
if args.n_gpu > 1:
loss = loss.mean(
) # mean() to average on multi-gpu parallel training
if args.gradient_accumulation_steps > 1:
loss = loss / args.gradient_accumulation_steps
if args.fp16:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
else:
loss.backward()
tr_loss += loss.item()
if (step + 1) % args.gradient_accumulation_steps == 0:
if args.fp16:
torch.nn.utils.clip_grad_norm_(
amp.master_params(optimizer), args.max_grad_norm)
else:
torch.nn.utils.clip_grad_norm_(model.parameters(),
args.max_grad_norm)
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args.local_rank in [
-1, 0
] and args.logging_steps > 0 and global_step % args.logging_steps == 0:
# Log metrics
if (
args.local_rank == -1
and args.evaluate_during_training
): # Only evaluate when single GPU otherwise metrics may not average well
results = evaluate(args, model, tokenizer)
for key, value in results.items():
tb_writer.add_scalar("eval_{}".format(key), value,
global_step)
tb_writer.add_scalar("lr",
scheduler.get_lr()[0], global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) /
args.logging_steps, global_step)
logging_loss = tr_loss
if args.local_rank in [
-1, 0
] and args.save_steps > 0 and global_step % args.save_steps == 0:
checkpoint_prefix = "checkpoint"
# Save model checkpoint
output_dir = os.path.join(
args.output_dir,
"{}-{}".format(checkpoint_prefix, global_step))
os.makedirs(output_dir, exist_ok=True)
model_to_save = (
model.module if hasattr(model, "module") else model
) # Take care of distributed/parallel training
model_to_save.save_pretrained(output_dir)
tokenizer.save_pretrained(output_dir)
torch.save(args,
os.path.join(output_dir, "training_args.bin"))
logger.info("Saving model checkpoint to %s", output_dir)
_rotate_checkpoints(args, checkpoint_prefix)
torch.save(optimizer.state_dict(),
os.path.join(output_dir, "optimizer.pt"))
torch.save(scheduler.state_dict(),
os.path.join(output_dir, "scheduler.pt"))
logger.info("Saving optimizer and scheduler states to %s",
output_dir)
if args.max_steps > 0 and global_step > args.max_steps:
epoch_iterator.close()
break
if args.max_steps > 0 and global_step > args.max_steps:
train_iterator.close()
break
if args.local_rank in [-1, 0]:
tb_writer.close()
return global_step, tr_loss / global_step
writer=writer,
**(sampler_kwargs or {}))
if equilibrate:
log.info('Equilibrating...')
with tqdm(count(), desc='equilibrating', disable=None) as steps:
next(
sample_wf(wf,
sampler.iter_with_info(),
steps,
equilibrate=equilibrate))
log.info('Equilibrated')
log.info('Initializing training')
steps = trange(
init_step,
n_steps,
initial=init_step,
total=n_steps,
desc='training',
disable=None,
)
chkpts = chkpts if chkpts is not None else []
last_log = 0
try:
for step, _ in fit_wf(
wf,
LossEnergy(),
opt,
sampler.iter_batches(
batch_size=batch_size,
epoch_size=epoch_size,
range=partial(trange,
desc='sampling',
def train(
self, train_dataset, output_dir, show_running_loss=True, eval_data=None, verbose=True, **kwargs,
):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
model = self.model
args = self.args
tb_writer = SummaryWriter(logdir=args.tensorboard_dir)
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(
train_dataset,
sampler=train_sampler,
batch_size=args.train_batch_size,
num_workers=self.args.dataloader_num_workers,
)
if args.max_steps > 0:
t_total = args.max_steps
args.num_train_epochs = args.max_steps // (len(train_dataloader) // args.gradient_accumulation_steps) + 1
else:
t_total = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = []
custom_parameter_names = set()
for group in self.args.custom_parameter_groups:
params = group.pop("params")
custom_parameter_names.update(params)
param_group = {**group}
param_group["params"] = [p for n, p in model.named_parameters() if n in params]
optimizer_grouped_parameters.append(param_group)
for group in self.args.custom_layer_parameters:
layer_number = group.pop("layer")
layer = f"layer.{layer_number}."
group_d = {**group}
group_nd = {**group}
group_nd["weight_decay"] = 0.0
params_d = []
params_nd = []
for n, p in model.named_parameters():
if n not in custom_parameter_names and layer in n:
if any(nd in n for nd in no_decay):
params_nd.append(p)
else:
params_d.append(p)
custom_parameter_names.add(n)
group_d["params"] = params_d
group_nd["params"] = params_nd
optimizer_grouped_parameters.append(group_d)
optimizer_grouped_parameters.append(group_nd)
if not self.args.train_custom_parameters_only:
optimizer_grouped_parameters.extend(
[
{
"params": [
p
for n, p in model.named_parameters()
if n not in custom_parameter_names and not any(nd in n for nd in no_decay)
],
"weight_decay": args.weight_decay,
},
{
"params": [
p
for n, p in model.named_parameters()
if n not in custom_parameter_names and any(nd in n for nd in no_decay)
],
"weight_decay": 0.0,
},
]
)
warmup_steps = math.ceil(t_total * args.warmup_ratio)
args.warmup_steps = warmup_steps if args.warmup_steps == 0 else args.warmup_steps
# TODO: Use custom optimizer like with BertSum?
optimizer = AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total
)
if (
args.model_name
and os.path.isfile(os.path.join(args.model_name, "optimizer.pt"))
and os.path.isfile(os.path.join(args.model_name, "scheduler.pt"))
):
# Load in optimizer and scheduler states
optimizer.load_state_dict(torch.load(os.path.join(args.model_name, "optimizer.pt")))
scheduler.load_state_dict(torch.load(os.path.join(args.model_name, "scheduler.pt")))
if args.n_gpu > 1:
model = torch.nn.DataParallel(model)
logger.info(" Training started")
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args.num_train_epochs), desc="Epoch", disable=args.silent, mininterval=0)
epoch_number = 0
best_eval_metric = None
early_stopping_counter = 0
steps_trained_in_current_epoch = 0
epochs_trained = 0
if args.model_name and os.path.exists(args.model_name):
try:
# set global_step to gobal_step of last saved checkpoint from model path
checkpoint_suffix = args.model_name.split("/")[-1].split("-")
if len(checkpoint_suffix) > 2:
checkpoint_suffix = checkpoint_suffix[1]
else:
checkpoint_suffix = checkpoint_suffix[-1]
global_step = int(checkpoint_suffix)
epochs_trained = global_step // (len(train_dataloader) // args.gradient_accumulation_steps)
steps_trained_in_current_epoch = global_step % (
len(train_dataloader) // args.gradient_accumulation_steps
)
logger.info(" Continuing training from checkpoint, will skip to saved global_step")
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d", global_step)
logger.info(" Will skip the first %d steps in the current epoch", steps_trained_in_current_epoch)
except ValueError:
logger.info(" Starting fine-tuning.")
if args.evaluate_during_training:
training_progress_scores = self._create_training_progress_scores(**kwargs)
if args.wandb_project:
wandb.init(project=args.wandb_project, config={**asdict(args)}, **args.wandb_kwargs)
wandb.watch(self.model)
if args.fp16:
scaler = amp.GradScaler()
model.train()
for current_epoch in train_iterator:
if epochs_trained > 0:
epochs_trained -= 1
continue
train_iterator.set_description(f"Epoch {epoch_number + 1} of {args.num_train_epochs}")
batch_iterator = tqdm(
train_dataloader,
desc=f"Running Epoch {epoch_number} of {args.num_train_epochs}",
disable=args.silent,
mininterval=0,
)
for step, batch in enumerate(batch_iterator):
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
# batch = tuple(t.to(device) for t in batch)
inputs = self._get_inputs_dict(batch)
with amp.autocast() if args.fp16 else nullcontext():
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
if args.n_gpu > 1:
loss = loss.mean() # mean() to average on multi-gpu parallel training
current_loss = loss.item()
if show_running_loss:
batch_iterator.set_description(
f"Epochs {epoch_number}/{args.num_train_epochs}. Running Loss: {current_loss:9.4f}"
)
if args.gradient_accumulation_steps > 1:
loss = loss / args.gradient_accumulation_steps
if args.fp16:
scaler.scale(loss).backward()
else:
loss.backward()
tr_loss += loss.item()
if (step + 1) % args.gradient_accumulation_steps == 0:
if args.fp16:
scaler.unscale_(optimizer)
torch.nn.utils.clip_grad_norm_(model.parameters(), args.max_grad_norm)
if args.fp16:
scaler.step(optimizer)
scaler.update()
else:
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args.logging_steps > 0 and global_step % args.logging_steps == 0:
# Log metrics
tb_writer.add_scalar("lr", scheduler.get_lr()[0], global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) / args.logging_steps, global_step)
logging_loss = tr_loss
if args.wandb_project:
wandb.log(
{
"Training loss": current_loss,
"lr": scheduler.get_lr()[0],
"global_step": global_step,
}
)
if args.save_steps > 0 and global_step % args.save_steps == 0:
# Save model checkpoint
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
self._save_model(output_dir_current, optimizer, scheduler, model=model)
if args.evaluate_during_training and (
args.evaluate_during_training_steps > 0
and global_step % args.evaluate_during_training_steps == 0
):
# Only evaluate when single GPU otherwise metrics may not average well
results = self.eval_model(
eval_data,
verbose=verbose and args.evaluate_during_training_verbose,
silent=args.evaluate_during_training_silent,
**kwargs,
)
for key, value in results.items():
tb_writer.add_scalar("eval_{}".format(key), value, global_step)
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
if args.save_eval_checkpoints:
self._save_model(output_dir_current, optimizer, scheduler, model=model, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(
os.path.join(args.output_dir, "training_progress_scores.csv"), index=False,
)
if args.wandb_project:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_metric:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(
args.best_model_dir, optimizer, scheduler, model=model, results=results
)
if best_eval_metric and args.early_stopping_metric_minimize:
if results[args.early_stopping_metric] - best_eval_metric < args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(
args.best_model_dir, optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args.use_early_stopping:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if results[args.early_stopping_metric] - best_eval_metric > args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(
args.best_model_dir, optimizer, scheduler, model=model, results=results
)
early_stopping_counter = 0
else:
if args.use_early_stopping:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
epoch_number += 1
output_dir_current = os.path.join(output_dir, "checkpoint-{}-epoch-{}".format(global_step, epoch_number))
if args.save_model_every_epoch or args.evaluate_during_training:
os.makedirs(output_dir_current, exist_ok=True)
if args.save_model_every_epoch:
self._save_model(output_dir_current, optimizer, scheduler, model=model)
if args.evaluate_during_training:
results = self.eval_model(
eval_data,
verbose=verbose and args.evaluate_during_training_verbose,
silent=args.evaluate_during_training_silent,
**kwargs,
)
if args.save_eval_checkpoints:
self._save_model(output_dir_current, optimizer, scheduler, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(os.path.join(args.output_dir, "training_progress_scores.csv"), index=False)
if args.wandb_project:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_metric:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(args.best_model_dir, optimizer, scheduler, model=model, results=results)
if best_eval_metric and args.early_stopping_metric_minimize:
if results[args.early_stopping_metric] - best_eval_metric < args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(args.best_model_dir, optimizer, scheduler, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping and args.early_stopping_consider_epochs:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if results[args.early_stopping_metric] - best_eval_metric > args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
if args.save_best_model:
self._save_model(args.best_model_dir, optimizer, scheduler, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping and args.early_stopping_consider_epochs:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
return global_step, tr_loss / global_step
def simulate_recon(
measured_sino,
ctim,
scanner_params,
simulate_3d=False,
nitr=60,
fwhm_rm=0.,
slice_idx=-1,
randoms=None,
scatter=None,
mu_input=False,
msk_radius=29.,
psf=None,
):
'''
Reconstruct PET image from simulated input data
using the EM-ML (2D) or OSEM (3D) algorithm.
measured_sino : simulated emission data with photon attenuation
ctim : either a 2D CT image or a 3D CT image from which a 2D slice
is chosen (slice_idx) for estimation of the attenuation factors
slice_idx : index to extract one 2D slice for this simulation
if input image is 3D
nitr : number of iterations used for the EM-ML reconstruction algorithm
scanner_params : scanner parameters containing scanner constants and
axial and transaxial look up tables (LUTs)
randoms : randoms and scatter events (optional)
'''
# > decompose the scanner constants and LUTs for easier access
Cnt = scanner_params['Cnt']
txLUT = scanner_params['txLUT']
axLUT = scanner_params['axLUT']
psfkernel = mmrrec.psf_config(psf, Cnt)
if simulate_3d:
if ctim.ndim!=3 \
or ctim.shape!=(Cnt['SO_IMZ'], Cnt['SO_IMY'], Cnt['SO_IMX']):
raise ValueError(
'The CT/mu-map image does not match the scanner image shape.')
else:
# > 2D case with reduced rings
if len(ctim.shape) == 3:
# make sure that the shape of the input image matches the image size of the scanner
if ctim.shape[1:] != (Cnt['SO_IMY'], Cnt['SO_IMX']):
raise ValueError(
'The input image shape for x and y does not match the scanner image size.'
)
# pick the right slice index (slice_idx) if not given or mistaken
if slice_idx < 0:
log.warning(
'the axial index <slice_idx> is chosen to be in the middle of axial FOV.'
)
slice_idx = ctim.shape[0] / 2
if slice_idx >= ctim.shape[0]:
raise ValueError(
'The axial index for 2D slice selection is outside the image.'
)
elif len(ctim.shape) == 2:
# make sure that the shape of the input image matches the image size of the scanner
if ctim.shape != (Cnt['SO_IMY'], Cnt['SO_IMX']):
raise ValueError(
'The input image shape for x and y does not match the scanner image size.'
)
ctim.shape = (1, ) + ctim.shape
slice_idx = 0
if 'rSZ_IMZ' not in Cnt:
raise ValueError('Missing reduced axial FOV parameters.')
# --------------------
if mu_input:
mui = ctim
else:
# > get the mu-map [1/cm] from CT [HU]
mui = nimpa.ct2mu(ctim)
# > get rid of negative values
mui[mui < 0] = 0
# --------------------
if simulate_3d:
rmu = mui
# > number of axial sinograms
nsinos = Cnt['NSN11']
else:
# --------------------
# > create a number of slides of the same chosen image slice
# for reduced (fast) 3D simulation
rmu = mui[slice_idx, :, :]
rmu.shape = (1, ) + rmu.shape
rmu = np.repeat(rmu, Cnt['rSZ_IMZ'], axis=0)
# --------------------
# > number of axial sinograms
nsinos = Cnt['rNSN1']
# import pdb; pdb.set_trace()
# > attenuation factor sinogram
attsino = mmrprj.frwd_prj(rmu,
scanner_params,
attenuation=True,
dev_out=True)
nrmsino = np.ones(attsino.shape, dtype=np.float32)
# > randoms and scatter put together
if isinstance(randoms,
np.ndarray) and measured_sino.shape == randoms.shape:
rsng = mmraux.remgaps(randoms, txLUT, Cnt)
else:
rsng = 1e-5 * np.ones((Cnt['Naw'], nsinos), dtype=np.float32)
if isinstance(scatter,
np.ndarray) and measured_sino.shape == scatter.shape:
ssng = mmraux.remgaps(scatter, txLUT, Cnt)
else:
ssng = 1e-5 * np.ones((Cnt['Naw'], nsinos), dtype=np.float32)
# resolution modelling
Cnt['SIGMA_RM'] = mmrrec.fwhm2sig(fwhm_rm, voxsize=Cnt['SZ_VOXZ'] *
10) if fwhm_rm else 0
if simulate_3d:
log.debug('------ OSEM (%d) -------', nitr)
# measured sinogram in GPU-enabled shape
psng = mmraux.remgaps(measured_sino.astype(np.uint16), txLUT, Cnt)
# > mask for reconstructed image. anything outside it is set to zero
msk = mmrimg.get_cylinder(
Cnt, rad=msk_radius, xo=0, yo=0, unival=1, gpu_dim=True) > 0.9
# > init image
eimg = np.ones((Cnt['SZ_IMY'], Cnt['SZ_IMX'], Cnt['SZ_IMZ']),
dtype=np.float32)
# ------------------------------------
Sn = 14 # number of subsets
# -get one subset to get number of projection bins in a subset
Sprj, s = mmrrec.get_subsets14(0, scanner_params)
Nprj = len(Sprj)
# > init subset array and sensitivity image for a given subset
sinoTIdx = np.zeros((Sn, Nprj + 1), dtype=np.int32)
# > init sensitivity images for each subset
sim = np.zeros((Sn, Cnt['SZ_IMY'], Cnt['SZ_IMX'], Cnt['SZ_IMZ']),
dtype=np.float32)
tmpsim = cu.zeros((Cnt['SZ_IMY'], Cnt['SZ_IMX'], Cnt['SZ_IMZ']),
dtype=np.float32)
for n in trange(Sn,
desc="sensitivity",
leave=log.getEffectiveLevel() < logging.INFO):
# first number of projection for the given subset
sinoTIdx[n, 0] = Nprj
sinoTIdx[n, 1:], s = mmrrec.get_subsets14(n, scanner_params)
# > sensitivity image
petprj.bprj(tmpsim.cuvec,
cu.asarray(attsino[sinoTIdx[n, 1:], :]).cuvec, txLUT,
axLUT, sinoTIdx[n, 1:], Cnt)
sim[n] = tmpsim
del tmpsim
# -------------------------------------
for _ in trange(nitr,
desc="OSEM",
disable=log.getEffectiveLevel() > logging.INFO,
leave=log.getEffectiveLevel() < logging.INFO):
petprj.osem(eimg, psng, rsng, ssng, nrmsino, attsino, sinoTIdx,
sim, msk, psfkernel, txLUT, axLUT, Cnt)
eim = mmrimg.convert2e7(eimg, Cnt)
else:
def psf(x, output=None):
if Cnt['SIGMA_RM']:
x = ndi.gaussian_filter(x,
sigma=Cnt['SIGMA_RM'],
mode='constant',
output=None)
return x
# > estimated image, initialised to ones
eim = np.ones(rmu.shape, dtype=np.float32)
msk = mmrimg.get_cylinder(
Cnt, rad=msk_radius, xo=0, yo=0, unival=1, gpu_dim=False) > 0.9
# > sensitivity image for the EM-ML reconstruction
sim = mmrprj.back_prj(attsino, scanner_params)
sim_inv = 1 / psf(sim)
sim_inv[~msk] = 0
rndsct = rsng + ssng
for _ in trange(nitr,
desc="MLEM",
disable=log.getEffectiveLevel() > logging.INFO,
leave=log.getEffectiveLevel() < logging.INFO):
# > remove gaps from the measured sinogram
# > then forward project the estimated image
# > after which divide the measured sinogram
# by the estimated sinogram (forward projected)
crrsino = (
mmraux.remgaps(measured_sino, txLUT, Cnt) /
(mmrprj.frwd_prj(psf(eim), scanner_params, dev_out=True) +
rndsct))
# > back project the correction factors sinogram
bim = mmrprj.back_prj(crrsino, scanner_params)
bim = psf(bim, output=bim)
# > divide the back-projected image by the sensitivity image
# > update the estimated image and remove NaNs
eim *= bim * sim_inv
eim[np.isnan(eim)] = 0
return eim
def generate( # pylint: disable=W0221
self,
x: np.ndarray,
y: Optional[np.ndarray] = None,
sample_sizes: Optional[np.ndarray] = None,
automatically_append: bool = True,
verify_input_data: bool = True,
perturb_sizes: Optional[List[List[int]]] = None,
perturb_starts: Optional[List[List[int]]] = None,
**kwargs,
) -> np.ndarray:
"""
Generates the adversarial examples. x needs to be composed of valid files by default which can support the
adversarial perturbation and so are malicious and can support the assigned L0 budget. They can obtained by
using `pull_out_valid_samples` on the data.
This check on the input data can be over-ridden by toggling the flag verify_input_data
This will result in only the data which can be made adversarial being perturbed and so the resulting batch will
be a mixture of adversarial and unperturbed data.
To assign the L0 budget we go through each list in perturb_sizes and perturb_starts in order, and
assign the budget based on the sizes given until the l0 budget is exhausted.
After all the regions marked in perturb_sizes and perturb_starts have been assigned and automatically_append is
set to true and remaining l0 perturbation the extra perturbation is added at the end in an append style attack.
:param x: A array with input data.
:param y: (N, 1) binary labels to make sure the benign files are zero masked.
:param sample_sizes: The size of the original file, before it was padded to the input size required by MalConv
:param automatically_append: Whether to automatically append extra spare perturbation at the end of the file.
:param verify_input_data: If to check that all the data supplied is valid for adversarial perturbations.
:param perturb_sizes: A list of length batch size, each element is in itself a list containing
the size of the allowable perturbation region
:param perturb_starts: A list of length batch size, each element is in itself a list containing
the start of perturbation region.
:return x: our adversarial examples.
"""
import tensorflow as tf # lgtm [py/repeated-import]
# make copy so original data is not modified.
adv_x = x.copy()
if sample_sizes is None: # pragma: no cover
raise ValueError(
"The size of the original files needs to be supplied")
if y is None: # pragma: no cover
raise ValueError(
"Labels need to be provided so we only modify the malware")
# check that the dimensions all match
assert len(adv_x) == len(y)
assert len(y) == len(sample_sizes)
if perturb_sizes is not None:
assert len(y) == len(perturb_sizes)
if perturb_starts is not None:
assert len(y) == len(perturb_starts)
# check that if perturb_starts is provided perturb_sizes is also provided and vise versa
if perturb_starts is not None:
assert perturb_sizes is not None
if perturb_sizes is not None:
assert perturb_starts is not None
# if we do not automatically append then make sure that we have supplied
# start and end positions for the perturbation.
if not automatically_append:
assert perturb_sizes is not None
assert perturb_starts is not None
perturbation_size = np.zeros(len(sample_sizes), dtype=int)
for i, sample_size in enumerate(sample_sizes):
if self.l_0 < 1: # l0 is a fraction of the filesize
perturbation_size[i] = int(sample_size * self.l_0)
else: # or l0 is interpreted as total perturbation size
perturbation_size[i] = int(self.l_0)
self.total_perturbation = np.copy(perturbation_size)
if perturb_sizes is not None and perturb_starts is not None:
perturbation_size, perturb_sizes = self.compute_perturbation_regions(
perturbation_size, perturb_sizes, automatically_append)
y = self.check_valid_size(y, sample_sizes, perturbation_size)
if verify_input_data:
if np.sum(y) != len(y):
raise ValueError( # pragma: no cover
f"{len(y) - np.sum(y)} invalid samples found in batch which cannot support the assigned "
f"perturbation or are benign To filter for samples that can be processed use "
f"pull_out_valid_samples on the samples. Checking can be disabled by using verify_input_data"
)
adv_x = self.initialise_sample(adv_x,
y,
sample_sizes,
perturbation_size,
perturb_sizes=perturb_sizes,
perturb_starts=perturb_starts)
mask = self.generate_mask(adv_x,
y,
sample_sizes,
perturbation_size,
perturb_sizes=perturb_sizes,
perturb_starts=perturb_starts)
embeddings = tf.nn.embedding_lookup(params=self.embedding_weights,
ids=adv_x.astype("int32"))
for _ in trange(self.num_of_iterations,
desc="PE Adv. Malware",
disable=not self.verbose):
gradients = self.estimator.class_gradient(embeddings, label=0)
# go from (bsize x 1 x features x embedding size) -> (bsize x features x embedding size) in a
# framework agnostic manner.
gradients = gradients[:, 0, :, :]
gradients = -1 * gradients
embeddings = self.update_embeddings(embeddings, gradients, mask)
adv_x = self.get_adv_malware(
embeddings=embeddings,
data=adv_x,
labels=y,
fsize=sample_sizes,
perturbation_size=perturbation_size,
perturb_sizes=perturb_sizes,
perturb_starts=perturb_starts,
)
return adv_x
def train(self,
train_dataset,
output_dir,
multi_label=False,
show_running_loss=True,
eval_df=None,
**kwargs):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
tokenizer = self.tokenizer
device = self.device
model = self.model
args = self.args
tb_writer = SummaryWriter(logdir=args["tensorboard_dir"])
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(train_dataset,
sampler=train_sampler,
batch_size=args["train_batch_size"])
t_total = len(train_dataloader) // args[
"gradient_accumulation_steps"] * args["num_train_epochs"]
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [{
"params": [
p for n, p in model.named_parameters()
if not any(nd in n for nd in no_decay)
],
"weight_decay":
args["weight_decay"]
}, {
"params": [
p for n, p in model.named_parameters()
if any(nd in n for nd in no_decay)
],
"weight_decay":
0.0
}]
warmup_steps = math.ceil(t_total * args["warmup_ratio"])
args["warmup_steps"] = warmup_steps if args[
"warmup_steps"] == 0 else args["warmup_steps"]
optimizer = AdamW(optimizer_grouped_parameters,
lr=args["learning_rate"],
eps=args["adam_epsilon"])
scheduler = get_linear_schedule_with_warmup(
optimizer,
num_warmup_steps=args["warmup_steps"],
num_training_steps=t_total)
if args["fp16"]:
try:
from apex import amp
except ImportError:
raise ImportError(
"Please install apex from https://www.github.com/nvidia/apex to use fp16 training."
)
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args["fp16_opt_level"])
if args["n_gpu"] > 1:
model = torch.nn.DataParallel(model)
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args["num_train_epochs"]),
desc="Epoch",
disable=args['silent'])
epoch_number = 0
if args['evaluate_during_training']:
extra_metrics = {key: [] for key in kwargs}
if multi_label:
training_progress_scores = {
'global_step': [],
'LRAP': [],
'train_loss': [],
'eval_loss': [],
**extra_metrics
}
else:
if self.model.num_labels == 2:
training_progress_scores = {
'global_step': [],
'tp': [],
'tn': [],
'fp': [],
'fn': [],
'mcc': [],
'train_loss': [],
'eval_loss': [],
**extra_metrics
}
else:
training_progress_scores = {
'global_step': [],
'mcc': [],
'train_loss': [],
'eval_loss': [],
**extra_metrics
}
if args['wandb_project']:
wandb.init(project=args['wandb_project'], config={**args})
wandb.watch(self.model)
model.train()
for _ in train_iterator:
# epoch_iterator = tqdm(train_dataloader, desc="Iteration")
for step, batch in enumerate(
tqdm(train_dataloader,
desc="Current iteration",
disable=args['silent'])):
batch = tuple(t.to(device) for t in batch)
inputs = self._get_inputs_dict(batch)
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
if args['n_gpu'] > 1:
loss = loss.mean(
) # mean() to average on multi-gpu parallel training
current_loss = loss.item()
if show_running_loss:
print("\rRunning loss: %f" % loss, end="")
if args["gradient_accumulation_steps"] > 1:
loss = loss / args["gradient_accumulation_steps"]
if args["fp16"]:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
torch.nn.utils.clip_grad_norm_(
amp.master_params(optimizer), args["max_grad_norm"])
else:
loss.backward()
torch.nn.utils.clip_grad_norm_(model.parameters(),
args["max_grad_norm"])
tr_loss += loss.item()
if (step + 1) % args["gradient_accumulation_steps"] == 0:
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args["logging_steps"] > 0 and global_step % args[
"logging_steps"] == 0:
# Log metrics
tb_writer.add_scalar("lr",
scheduler.get_lr()[0],
global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) /
args["logging_steps"],
global_step)
logging_loss = tr_loss
if args['wandb_project']:
wandb.log({
'Training loss': current_loss,
'lr': scheduler.get_lr()[0],
'global_step': global_step
})
if args["save_steps"] > 0 and global_step % args[
"save_steps"] == 0:
# Save model checkpoint
output_dir_current = os.path.join(
output_dir, "checkpoint-{}".format(global_step))
if not os.path.exists(output_dir_current):
os.makedirs(output_dir_current)
# Take care of distributed/parallel training
model_to_save = model.module if hasattr(
model, "module") else model
model_to_save.save_pretrained(output_dir_current)
self.tokenizer.save_pretrained(output_dir_current)
if args['evaluate_during_training'] and (
args["evaluate_during_training_steps"] > 0
and global_step %
args["evaluate_during_training_steps"] == 0):
# Only evaluate when single GPU otherwise metrics may not average well
results, _, _ = self.eval_model(eval_df,
verbose=True,
**kwargs)
for key, value in results.items():
tb_writer.add_scalar('eval_{}'.format(key), value,
global_step)
output_dir_current = os.path.join(
output_dir, "checkpoint-{}".format(global_step))
if not os.path.exists(output_dir_current):
os.makedirs(output_dir_current)
if args['save_eval_checkpoints']:
model_to_save = model.module if hasattr(
model, "module") else model
model_to_save.save_pretrained(output_dir_current)
self.tokenizer.save_pretrained(output_dir_current)
output_eval_file = os.path.join(
output_dir_current, "eval_results.txt")
with open(output_eval_file, "w") as writer:
for key in sorted(results.keys()):
writer.write("{} = {}\n".format(
key, str(results[key])))
training_progress_scores['global_step'].append(
global_step)
training_progress_scores['train_loss'].append(
current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(args['output_dir'] +
'training_progress_scores.csv',
index=False)
if args['wandb_project']:
wandb.log(
self._get_last_metrics(
training_progress_scores))
epoch_number += 1
output_dir_current = os.path.join(output_dir,
"epoch-{}".format(epoch_number))
if not os.path.exists(output_dir_current):
os.makedirs(output_dir_current)
model_to_save = model.module if hasattr(model, "module") else model
model_to_save.save_pretrained(output_dir_current)
self.tokenizer.save_pretrained(output_dir_current)
if args['evaluate_during_training']:
results, _, _ = self.eval_model(eval_df,
verbose=True,
**kwargs)
output_eval_file = os.path.join(output_dir_current,
"eval_results.txt")
with open(output_eval_file, "w") as writer:
for key in sorted(results.keys()):
writer.write("{} = {}\n".format(
key, str(results[key])))
return global_step, tr_loss / global_step
def train(self,
train_dataset,
output_dir,
show_running_loss=True,
eval_data=None):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
tokenizer = self.tokenizer
device = self.device
model = self.model
args = self.args
tb_writer = SummaryWriter()
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(train_dataset,
sampler=train_sampler,
batch_size=args["train_batch_size"])
t_total = len(train_dataloader) // args[
"gradient_accumulation_steps"] * args["num_train_epochs"]
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [{
"params": [
p for n, p in model.named_parameters()
if not any(nd in n for nd in no_decay)
],
"weight_decay":
args["weight_decay"]
}, {
"params": [
p for n, p in model.named_parameters()
if any(nd in n for nd in no_decay)
],
"weight_decay":
0.0
}]
warmup_steps = math.ceil(t_total * args["warmup_ratio"])
args["warmup_steps"] = warmup_steps if args[
"warmup_steps"] == 0 else args["warmup_steps"]
optimizer = AdamW(optimizer_grouped_parameters,
lr=args["learning_rate"],
eps=args["adam_epsilon"])
scheduler = get_linear_schedule_with_warmup(
optimizer,
num_warmup_steps=args["warmup_steps"],
num_training_steps=t_total)
if args["fp16"]:
try:
from apex import amp
except ImportError:
raise ImportError(
"Please install apex from https://www.github.com/nvidia/apex to use fp16 training."
)
model, optimizer = amp.initialize(model,
optimizer,
opt_level=args["fp16_opt_level"])
if args["n_gpu"] > 1:
model = torch.nn.DataParallel(model)
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args["num_train_epochs"]),
desc="Epoch",
disable=args['silent'])
model.train()
for _ in train_iterator:
# epoch_iterator = tqdm(train_dataloader, desc="Iteration")
for step, batch in enumerate(
tqdm(train_dataloader,
desc="Current iteration",
disable=args['silent'])):
batch = tuple(t.to(device) for t in batch)
inputs = {
'input_ids': batch[0],
'attention_mask': batch[1],
'start_positions': batch[3],
'end_positions': batch[4]
}
if args['model_type'] != 'distilbert':
inputs['token_type_ids'] = None if args[
'model_type'] == 'xlm' else batch[2]
if args['model_type'] in ['xlnet', 'xlm']:
inputs.update({'cls_index': batch[5], 'p_mask': batch[6]})
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
if show_running_loss:
print("\rRunning loss: %f" % loss, end="")
if args['n_gpu'] > 1:
loss = loss.mean(
) # mean() to average on multi-gpu parallel training
if args["gradient_accumulation_steps"] > 1:
loss = loss / args["gradient_accumulation_steps"]
if args["fp16"]:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
torch.nn.utils.clip_grad_norm_(
amp.master_params(optimizer), args["max_grad_norm"])
else:
loss.backward()
torch.nn.utils.clip_grad_norm_(model.parameters(),
args["max_grad_norm"])
tr_loss += loss.item()
if (step + 1) % args["gradient_accumulation_steps"] == 0:
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args["logging_steps"] > 0 and global_step % args[
"logging_steps"] == 0:
# Log metrics
if args['evaluate_during_training']:
# Only evaluate when single GPU otherwise metrics may not average well
results, _, _ = self.eval_model(eval_data,
verbose=True)
for key, value in results.items():
tb_writer.add_scalar('eval_{}'.format(key),
value, global_step)
tb_writer.add_scalar("lr",
scheduler.get_lr()[0],
global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) /
args["logging_steps"],
global_step)
logging_loss = tr_loss
if args["save_steps"] > 0 and global_step % args[
"save_steps"] == 0:
# Save model checkpoint
output_dir_current = os.path.join(
output_dir, "checkpoint-{}".format(global_step))
if not os.path.exists(output_dir_current):
os.makedirs(output_dir_current)
# Take care of distributed/parallel training
model_to_save = model.module if hasattr(
model, "module") else model
model_to_save.save_pretrained(output_dir_current)
self.tokenizer.save_pretrained(output_dir_current)
return global_step, tr_loss / global_step
def train(self, model_path: Optional[str] = None):
"""
Main training entry point.
Args:
model_path:
(Optional) Local path to model if model to train has been instantiated from a local path
If present, we will try reloading the optimizer/scheduler states from there.
"""
train_dataloader = self.get_train_dataloader()
if self.args.max_steps > 0:
t_total = self.args.max_steps
num_train_epochs = (
self.args.max_steps // (len(train_dataloader) // self.args.gradient_accumulation_steps) + 1
)
else:
t_total = int(len(train_dataloader) // self.args.gradient_accumulation_steps * self.args.num_train_epochs)
num_train_epochs = self.args.num_train_epochs
optimizer, scheduler = self.get_optimizers(num_training_steps=t_total)
# Check if saved optimizer or scheduler states exist
if (
model_path is not None
and os.path.isfile(os.path.join(model_path, "optimizer.pt"))
and os.path.isfile(os.path.join(model_path, "scheduler.pt"))
):
# Load in optimizer and scheduler states
optimizer.load_state_dict(torch.load(os.path.join(model_path, "optimizer.pt")))
scheduler.load_state_dict(torch.load(os.path.join(model_path, "scheduler.pt")))
model = self.model
model.to(self.args.device)
if self.args.fp16:
if not is_apex_available():
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=self.args.fp16_opt_level)
# multi-gpu training (should be after apex fp16 initialization)
if self.args.n_gpu > 1:
model = torch.nn.DataParallel(model)
# Distributed training (should be after apex fp16 initialization)
if self.args.local_rank != -1:
model = torch.nn.parallel.DistributedDataParallel(
model,
device_ids=[self.args.local_rank],
output_device=self.args.local_rank,
find_unused_parameters=True,
)
if self.tb_writer is not None:
self.tb_writer.add_text("args", self.args.to_json_string())
self.tb_writer.add_hparams(self.args.to_sanitized_dict(), metric_dict={})
if is_wandb_available():
self._setup_wandb()
# Train!
if is_tpu_available():
total_train_batch_size = self.args.train_batch_size * xm.xrt_world_size()
else:
total_train_batch_size = (
self.args.train_batch_size
* self.args.gradient_accumulation_steps
* (torch.distributed.get_world_size() if self.args.local_rank != -1 else 1)
)
logger.info("***** Running training *****")
logger.info(" Num examples = %d", self.num_examples(train_dataloader))
logger.info(" Num Epochs = %d", num_train_epochs)
logger.info(" Instantaneous batch size per device = %d", self.args.per_gpu_train_batch_size)
logger.info(" Total train batch size (w. parallel, distributed & accumulation) = %d", total_train_batch_size)
logger.info(" Gradient Accumulation steps = %d", self.args.gradient_accumulation_steps)
logger.info(" Total optimization steps = %d", t_total)
global_step = 0
epochs_trained = 0
steps_trained_in_current_epoch = 0
# Check if continuing training from a checkpoint
if model_path is not None:
# set global_step to global_step of last saved checkpoint from model path
try:
global_step = int(model_path.split("-")[-1].split("/")[0])
epochs_trained = global_step // (len(train_dataloader) // self.args.gradient_accumulation_steps)
steps_trained_in_current_epoch = global_step % (
len(train_dataloader) // self.args.gradient_accumulation_steps
)
logger.info(" Continuing training from checkpoint, will skip to saved global_step")
logger.info(" Continuing training from epoch %d", epochs_trained)
logger.info(" Continuing training from global step %d", global_step)
logger.info(" Will skip the first %d steps in the first epoch", steps_trained_in_current_epoch)
except ValueError:
global_step = 0
logger.info(" Starting fine-tuning.")
tr_loss = 0.0
logging_loss = 0.0
model.zero_grad()
train_iterator = trange(
epochs_trained, int(num_train_epochs), desc="Epoch", disable=not self.is_local_master()
)
for epoch in train_iterator:
epoch_iterator = tqdm(train_dataloader, desc="Iteration", disable=not self.is_local_master())
for step, inputs in enumerate(epoch_iterator):
# Skip past any already trained steps if resuming training
if steps_trained_in_current_epoch > 0:
steps_trained_in_current_epoch -= 1
continue
tr_loss += self._training_step(model, inputs, optimizer)
if (step + 1) % self.args.gradient_accumulation_steps == 0 or (
# last step in epoch but step is always smaller than gradient_accumulation_steps
len(epoch_iterator) <= self.args.gradient_accumulation_steps
and (step + 1) == len(epoch_iterator)
):
if self.args.fp16:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), self.args.max_grad_norm)
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), self.args.max_grad_norm)
if is_tpu_available():
xm.optimizer_step(optimizer)
else:
optimizer.step()
scheduler.step()
model.zero_grad()
global_step += 1
if self.is_local_master():
if (self.args.logging_steps > 0 and global_step % self.args.logging_steps == 0) or (
global_step == 1 and self.args.logging_first_step
):
logs = {}
if self.args.evaluate_during_training:
results = self.evaluate()
for key, value in results.items():
eval_key = "eval_{}".format(key)
logs[eval_key] = value
loss_scalar = (tr_loss - logging_loss) / self.args.logging_steps
learning_rate_scalar = scheduler.get_last_lr()[0]
logs["learning_rate"] = learning_rate_scalar
logs["loss"] = loss_scalar
logging_loss = tr_loss
if self.tb_writer:
for k, v in logs.items():
self.tb_writer.add_scalar(k, v, global_step)
if is_wandb_available():
wandb.log(logs, step=global_step)
epoch_iterator.write(json.dumps({**logs, **{"step": global_step}}))
if self.args.save_steps > 0 and global_step % self.args.save_steps == 0:
# In all cases (even distributed/parallel), self.model is always a reference
# to the model we want to save.
if hasattr(model, "module"):
assert model.module is self.model
else:
assert model is self.model
# Save model checkpoint
output_dir = os.path.join(self.args.output_dir, f"{PREFIX_CHECKPOINT_DIR}-{global_step}")
self.save_model(output_dir)
self._rotate_checkpoints()
torch.save(optimizer.state_dict(), os.path.join(output_dir, "optimizer.pt"))
torch.save(scheduler.state_dict(), os.path.join(output_dir, "scheduler.pt"))
logger.info("Saving optimizer and scheduler states to %s", output_dir)
if self.args.max_steps > 0 and global_step > self.args.max_steps:
epoch_iterator.close()
break
if self.args.max_steps > 0 and global_step > self.args.max_steps:
train_iterator.close()
break
if self.args.tpu_metrics_debug:
# tpu-comment: Logging debug metrics for PyTorch/XLA (compile, execute times, ops, etc.)
xm.master_print(met.metrics_report())
if self.tb_writer:
self.tb_writer.close()
logger.info("\n\nTraining completed. Do not forget to share your model on huggingface.co/models =)\n\n")
return TrainOutput(global_step, tr_loss / global_step)
def _attack(
self,
initial_sample: np.ndarray,
original_sample: np.ndarray,
y_p: int,
target: int,
initial_delta: float,
initial_epsilon: float,
clip_min: float,
clip_max: float,
) -> np.ndarray:
"""
Main function for the boundary attack.
:param initial_sample: An initial adversarial example.
:param original_sample: The original input.
:param y_p: The predicted label of the original input.
:param target: The target label.
:param initial_delta: Initial step size for the orthogonal step.
:param initial_epsilon: Initial step size for the step towards the target.
:param clip_min: Minimum value of an example.
:param clip_max: Maximum value of an example.
:return: an adversarial example.
"""
# Get initialization for some variables
x_adv = initial_sample
self.curr_delta = initial_delta
self.curr_epsilon = initial_epsilon
self.curr_adv = x_adv
# Main loop to wander around the boundary
for _ in trange(self.max_iter,
desc="Boundary attack - iterations",
disable=not self.verbose):
# Trust region method to adjust delta
for _ in range(self.num_trial):
potential_advs = []
for _ in range(self.sample_size):
potential_adv = x_adv + self._orthogonal_perturb(
self.curr_delta, x_adv, original_sample)
potential_adv = np.clip(potential_adv, clip_min, clip_max)
potential_advs.append(potential_adv)
preds = np.argmax(
self.estimator.predict(np.array(potential_advs),
batch_size=self.batch_size),
axis=1,
)
if self.targeted:
satisfied = preds == target
else:
satisfied = preds != y_p
delta_ratio = np.mean(satisfied)
if delta_ratio < 0.2:
self.curr_delta *= self.step_adapt
elif delta_ratio > 0.5:
self.curr_delta /= self.step_adapt
if delta_ratio > 0:
x_advs = np.array(potential_advs)[np.where(satisfied)[0]]
break
else:
logger.warning("Adversarial example found but not optimal.")
return x_adv
# Trust region method to adjust epsilon
for _ in range(self.num_trial):
perturb = np.repeat(
np.array([original_sample]), len(x_advs), axis=0) - x_advs
perturb *= self.curr_epsilon
potential_advs = x_advs + perturb
potential_advs = np.clip(potential_advs, clip_min, clip_max)
preds = np.argmax(
self.estimator.predict(potential_advs,
batch_size=self.batch_size),
axis=1,
)
if self.targeted:
satisfied = preds == target
else:
satisfied = preds != y_p
epsilon_ratio = np.mean(satisfied)
if epsilon_ratio < 0.2:
self.curr_epsilon *= self.step_adapt
elif epsilon_ratio > 0.5:
self.curr_epsilon /= self.step_adapt
if epsilon_ratio > 0:
x_adv = self._best_adv(
original_sample,
potential_advs[np.where(satisfied)[0]])
self.curr_adv = x_adv
break
else:
logger.warning("Adversarial example found but not optimal.")
return self._best_adv(original_sample, x_advs)
if self.min_epsilon is not None and self.curr_epsilon < self.min_epsilon:
return x_adv
return x_adv
def train(
self,
train_dataset,
output_dir,
files_list=None,
image_path=None,
text_label=None,
labels_label=None,
images_label=None,
image_type_extension=None,
data_type_extension=None,
show_running_loss=True,
eval_data=None,
verbose=True,
**kwargs,
):
"""
Trains the model on train_dataset.
Utility function to be used by the train_model() method. Not intended to be used directly.
"""
device = self.device
model = self.model
args = self.args
multi_label = self.multi_label
tb_writer = SummaryWriter(logdir=args.tensorboard_dir)
train_sampler = RandomSampler(train_dataset)
train_dataloader = DataLoader(
train_dataset,
sampler=train_sampler,
batch_size=args.train_batch_size,
collate_fn=collate_fn,
num_workers=args.process_count,
)
t_total = len(train_dataloader) // args.gradient_accumulation_steps * args.num_train_epochs
no_decay = ["bias", "LayerNorm.weight"]
optimizer_grouped_parameters = [
{
"params": [p for n, p in model.named_parameters() if not any(nd in n for nd in no_decay)],
"weight_decay": args.weight_decay,
},
{
"params": [p for n, p in model.named_parameters() if any(nd in n for nd in no_decay)],
"weight_decay": 0.0,
},
]
warmup_steps = math.ceil(t_total * args.warmup_ratio)
args.warmup_steps = warmup_steps if args.warmup_steps == 0 else args.warmup_steps
optimizer = AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total
)
if args.fp16:
try:
from apex import amp
except ImportError:
raise ImportError("Please install apex from https://www.github.com/nvidia/apex to use fp16 training.")
model, optimizer = amp.initialize(model, optimizer, opt_level=args.fp16_opt_level)
if args.n_gpu > 1:
model = torch.nn.DataParallel(model)
global_step = 0
tr_loss, logging_loss = 0.0, 0.0
model.zero_grad()
train_iterator = trange(int(args.num_train_epochs), desc="Epoch", disable=args.silent)
epoch_number = 0
best_eval_metric = None
early_stopping_counter = 0
if args.evaluate_during_training:
training_progress_scores = self._create_training_progress_scores(multi_label, **kwargs)
if args.wandb_project:
wandb.init(project=args.wandb_project, config={**args}, **args.wandb_kwargs)
wandb.watch(self.model)
model.train()
for _ in train_iterator:
train_iterator.set_description(f"Epoch {epoch_number} of {args.num_train_epochs}")
for step, batch in enumerate(
tqdm(train_dataloader, desc=f"Running Epoch {epoch_number}", disable=args.silent)
):
batch = tuple(t.to(device) for t in batch)
labels = batch[5]
inputs = self._get_inputs_dict(batch)
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
logits = outputs[0] # Different from default behaviour
loss = self.criterion(logits, labels)
if args.n_gpu > 1:
loss = loss.mean() # mean() to average on multi-gpu parallel training
current_loss = loss.item()
if show_running_loss:
print("\rRunning loss: %f" % loss, end="")
if args.gradient_accumulation_steps > 1:
loss = loss / args.gradient_accumulation_steps
if args.fp16:
with amp.scale_loss(loss, optimizer) as scaled_loss:
scaled_loss.backward()
# torch.nn.utils.clip_grad_norm_(
# amp.master_params(optimizer), args.max_grad_norm
# )
else:
loss.backward()
# torch.nn.utils.clip_grad_norm_(
# model.parameters(), args.max_grad_norm
# )
tr_loss += loss.item()
if (step + 1) % args.gradient_accumulation_steps == 0:
if args.fp16:
torch.nn.utils.clip_grad_norm_(amp.master_params(optimizer), args.max_grad_norm)
else:
torch.nn.utils.clip_grad_norm_(model.parameters(), args.max_grad_norm)
optimizer.step()
scheduler.step() # Update learning rate schedule
model.zero_grad()
global_step += 1
if args.logging_steps > 0 and global_step % args.logging_steps == 0:
# Log metrics
tb_writer.add_scalar("lr", scheduler.get_lr()[0], global_step)
tb_writer.add_scalar("loss", (tr_loss - logging_loss) / args.logging_steps, global_step)
logging_loss = tr_loss
if args.wandb_project:
wandb.log(
{
"Training loss": current_loss,
"lr": scheduler.get_lr()[0],
"global_step": global_step,
}
)
if args.save_steps > 0 and global_step % args.save_steps == 0:
# Save model checkpoint
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
self._save_model(output_dir_current, model=model)
if args.evaluate_during_training and (
args.evaluate_during_training_steps > 0
and global_step % args.evaluate_during_training_steps == 0
):
# Only evaluate when single GPU otherwise metrics may not average well
results, _ = self.eval_model(
eval_data,
files_list=files_list,
image_path=image_path,
text_label=text_label,
labels_label=labels_label,
images_label=images_label,
image_type_extension=image_type_extension,
data_type_extension=data_type_extension,
verbose=verbose and args.evaluate_during_training_verbose,
silent=args.evaluate_during_training_silent,
**kwargs,
)
for key, value in results.items():
tb_writer.add_scalar("eval_{}".format(key), value, global_step)
output_dir_current = os.path.join(output_dir, "checkpoint-{}".format(global_step))
if args.save_eval_checkpoints:
self._save_model(output_dir_current, model=model, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(
os.path.join(args.output_dir, "training_progress_scores.csv"), index=False,
)
if args.wandb_project:
wandb.log(self._get_last_metrics(training_progress_scores))
if not best_eval_metric:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
if best_eval_metric and args.early_stopping_metric_minimize:
if results[args.early_stopping_metric] - best_eval_metric < args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if results[args.early_stopping_metric] - best_eval_metric > args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
epoch_number += 1
output_dir_current = os.path.join(output_dir, "checkpoint-{}-epoch-{}".format(global_step, epoch_number))
if args.save_model_every_epoch or args.evaluate_during_training:
os.makedirs(output_dir_current, exist_ok=True)
if args.save_model_every_epoch:
self._save_model(output_dir_current, model=model)
if args.evaluate_during_training:
results, _ = self.eval_model(
eval_data,
files_list=files_list,
image_path=image_path,
text_label=text_label,
labels_label=labels_label,
images_label=images_label,
image_type_extension=image_type_extension,
data_type_extension=data_type_extension,
verbose=verbose and args.evaluate_during_training_verbose,
silent=args.evaluate_during_training_silent,
**kwargs,
)
self._save_model(output_dir_current, results=results)
training_progress_scores["global_step"].append(global_step)
training_progress_scores["train_loss"].append(current_loss)
for key in results:
training_progress_scores[key].append(results[key])
report = pd.DataFrame(training_progress_scores)
report.to_csv(
os.path.join(args.output_dir, "training_progress_scores.csv"), index=False,
)
if not best_eval_metric:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
if best_eval_metric and args.early_stopping_metric_minimize:
if results[args.early_stopping_metric] - best_eval_metric < args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping and args.early_stopping_consider_epochs:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
else:
if results[args.early_stopping_metric] - best_eval_metric > args.early_stopping_delta:
best_eval_metric = results[args.early_stopping_metric]
self._save_model(args.best_model_dir, model=model, results=results)
early_stopping_counter = 0
else:
if args.use_early_stopping and args.early_stopping_consider_epochs:
if early_stopping_counter < args.early_stopping_patience:
early_stopping_counter += 1
if verbose:
logger.info(f" No improvement in {args.early_stopping_metric}")
logger.info(f" Current step: {early_stopping_counter}")
logger.info(f" Early stopping patience: {args.early_stopping_patience}")
else:
if verbose:
logger.info(f" Patience of {args.early_stopping_patience} steps reached")
logger.info(" Training terminated.")
train_iterator.close()
return global_step, tr_loss / global_step
return global_step, tr_loss / global_step
def generate(self, x: np.ndarray, y: Optional[np.ndarray] = None, **kwargs) -> np.ndarray:
"""
Generate adversarial samples and return them in an array.
:param x: An array with the original inputs to be attacked.
:param y: Target values (class labels) one-hot-encoded of shape (nb_samples, nb_classes) or indices of shape
(nb_samples,). If `self.targeted` is true, then `y_val` represents the target labels. Otherwise, the
targets are the original class labels.
:return: An array holding the adversarial examples.
"""
y = check_and_transform_label_format(y, self.estimator.nb_classes)
x_adv = x.astype(ART_NUMPY_DTYPE)
if self.estimator.clip_values is not None:
clip_min_per_pixel, clip_max_per_pixel = self.estimator.clip_values
else:
clip_min_per_pixel, clip_max_per_pixel = np.amin(x), np.amax(x)
# Assert that, if attack is targeted, y_val is provided:
if self.targeted and y is None:
raise ValueError("Target labels `y` need to be provided for a targeted attack.")
# No labels provided, use model prediction as correct class
if y is None:
y = get_labels_np_array(self.estimator.predict(x, batch_size=self.batch_size))
# Compute perturbation with implicit batching
nb_batches = int(np.ceil(x_adv.shape[0] / float(self.batch_size)))
for batch_id in trange(nb_batches, desc="C&W L_inf", disable=not self.verbose):
batch_index_1, batch_index_2 = batch_id * self.batch_size, (batch_id + 1) * self.batch_size
x_batch = x_adv[batch_index_1:batch_index_2]
y_batch = y[batch_index_1:batch_index_2]
# Determine values for later clipping
clip_min = np.clip(x_batch - self.eps, clip_min_per_pixel, clip_max_per_pixel)
clip_max = np.clip(x_batch + self.eps, clip_min_per_pixel, clip_max_per_pixel)
# The optimization is performed in tanh space to keep the
# adversarial images bounded from clip_min and clip_max.
x_batch_tanh = original_to_tanh(x_batch, clip_min, clip_max, self._tanh_smoother)
# Initialize perturbation in tanh space:
x_adv_batch = x_batch.copy()
x_adv_batch_tanh = x_batch_tanh.copy()
# Initialize optimization:
z_logits, loss = self._loss(x_adv_batch, y_batch)
attack_success = loss <= 0
learning_rate = self.learning_rate * np.ones(x_batch.shape[0])
for i_iter in range(self.max_iter):
logger.debug("Iteration step %i out of %i", i_iter, self.max_iter)
logger.debug("Average Loss: %f", np.mean(loss))
logger.debug(
"Successful attack samples: %i out of %i", int(np.sum(attack_success)), x_batch.shape[0],
)
# only continue optimization for those samples where attack hasn't succeeded yet:
active = ~attack_success
if np.sum(active) == 0:
break
# compute gradient:
logger.debug("Compute loss gradient")
perturbation_tanh = -self._loss_gradient(
z_logits[active],
y_batch[active],
x_adv_batch[active],
x_adv_batch_tanh[active],
clip_min[active],
clip_max[active],
)
# perform line search to optimize perturbation
# first, halve the learning rate until perturbation actually decreases the loss:
prev_loss = loss.copy()
best_loss = loss.copy()
best_lr = np.zeros(x_batch.shape[0])
halving = np.zeros(x_batch.shape[0])
for i_halve in range(self.max_halving):
logger.debug(
"Perform halving iteration %i out of %i", i_halve, self.max_halving,
)
do_halving = loss[active] >= prev_loss[active]
logger.debug("Halving to be performed on %i samples", int(np.sum(do_halving)))
if np.sum(do_halving) == 0:
break
active_and_do_halving = active.copy()
active_and_do_halving[active] = do_halving
lr_mult = learning_rate[active_and_do_halving]
for _ in range(len(x.shape) - 1):
lr_mult = lr_mult[:, np.newaxis]
adv_10 = x_adv_batch_tanh[active_and_do_halving]
new_x_adv_batch_tanh = adv_10 + lr_mult * perturbation_tanh[do_halving]
new_x_adv_batch = tanh_to_original(
new_x_adv_batch_tanh, clip_min[active_and_do_halving], clip_max[active_and_do_halving],
)
_, loss[active_and_do_halving] = self._loss(new_x_adv_batch, y_batch[active_and_do_halving])
logger.debug("New Average Loss: %f", np.mean(loss))
logger.debug("Loss: %s", str(loss))
logger.debug("Prev_loss: %s", str(prev_loss))
logger.debug("Best_loss: %s", str(best_loss))
best_lr[loss < best_loss] = learning_rate[loss < best_loss]
best_loss[loss < best_loss] = loss[loss < best_loss]
learning_rate[active_and_do_halving] /= 2
halving[active_and_do_halving] += 1
learning_rate[active] *= 2
# if no halving was actually required, double the learning rate as long as this
# decreases the loss:
for i_double in range(self.max_doubling):
logger.debug(
"Perform doubling iteration %i out of %i", i_double, self.max_doubling,
)
do_doubling = (halving[active] == 1) & (loss[active] <= best_loss[active])
logger.debug(
"Doubling to be performed on %i samples", int(np.sum(do_doubling)),
)
if np.sum(do_doubling) == 0:
break
active_and_do_doubling = active.copy()
active_and_do_doubling[active] = do_doubling
learning_rate[active_and_do_doubling] *= 2
lr_mult = learning_rate[active_and_do_doubling]
for _ in range(len(x.shape) - 1):
lr_mult = lr_mult[:, np.newaxis]
x_adv15 = x_adv_batch_tanh[active_and_do_doubling]
new_x_adv_batch_tanh = x_adv15 + lr_mult * perturbation_tanh[do_doubling]
new_x_adv_batch = tanh_to_original(
new_x_adv_batch_tanh, clip_min[active_and_do_doubling], clip_max[active_and_do_doubling],
)
_, loss[active_and_do_doubling] = self._loss(new_x_adv_batch, y_batch[active_and_do_doubling])
logger.debug("New Average Loss: %f", np.mean(loss))
best_lr[loss < best_loss] = learning_rate[loss < best_loss]
best_loss[loss < best_loss] = loss[loss < best_loss]
learning_rate[halving == 1] /= 2
update_adv = best_lr[active] > 0
logger.debug(
"Number of adversarial samples to be finally updated: %i", int(np.sum(update_adv)),
)
if np.sum(update_adv) > 0:
active_and_update_adv = active.copy()
active_and_update_adv[active] = update_adv
best_lr_mult = best_lr[active_and_update_adv]
for _ in range(len(x.shape) - 1):
best_lr_mult = best_lr_mult[:, np.newaxis]
best_13 = best_lr_mult * perturbation_tanh[update_adv]
x_adv_batch_tanh[active_and_update_adv] = x_adv_batch_tanh[active_and_update_adv] + best_13
x_adv_batch[active_and_update_adv] = tanh_to_original(
x_adv_batch_tanh[active_and_update_adv],
clip_min[active_and_update_adv],
clip_max[active_and_update_adv],
)
(z_logits[active_and_update_adv], loss[active_and_update_adv],) = self._loss(
x_adv_batch[active_and_update_adv], y_batch[active_and_update_adv],
)
attack_success = loss <= 0
# Update depending on attack success:
x_adv_batch[~attack_success] = x_batch[~attack_success]
x_adv[batch_index_1:batch_index_2] = x_adv_batch
logger.info(
"Success rate of C&W L_inf attack: %.2f%%",
100 * compute_success(self.estimator, x, y, x_adv, self.targeted, batch_size=self.batch_size),
)
return x_adv
def _sample_chain(self, rng, n_sample, init_state, chain_var_funcs,
chain_index, parallel_chains, memmap_enabled,
memmap_path):
if not isinstance(init_state, ChainState):
state = ChainState(init_state)
else:
state = init_state
chain_stats = self._init_chain_stats(
n_sample, memmap_enabled, memmap_path, chain_index)
# Initialise chain variable trace arrays
chains = {}
for key, chain_func in chain_var_funcs.items():
var = chain_func(state)
if memmap_enabled:
filename = self._generate_memmap_filename(
memmap_path, 'trace', key, chain_index)
chains[key] = self._open_new_memmap(
filename, (n_sample,) + var.shape, np.float64, np.nan)
else:
chains[key] = np.full((n_sample,) + var.shape, np.nan)
total_return_nbytes = get_size(chain_stats) + get_size(chains)
# Check if running in parallel and if total number of bytes to be
# returned exceeds pickle limit
if parallel_chains and total_return_nbytes > 2**31 - 1:
raise RuntimeError(
f'Total number of bytes allocated for arrays to be returned '
f'({total_return_nbytes / 2**30:.2f} GiB) exceeds size limit '
f'for returning results of a process (2 GiB). Try rerunning '
f'with chain memory-mapping enabled (`memmap_enabled=True`).')
if TQDM_AVAILABLE:
desc = ('Sampling' if chain_index is None
else f'Chain {chain_index}')
position = chain_index if parallel_chains else None
sample_range = tqdm.trange(
n_sample, desc=desc, unit='it', dynamic_ncols=True,
position=position)
else:
sample_range = range(n_sample)
try:
for sample_index in sample_range:
for trans_key, transition in self.transitions.items():
state, trans_stats = transition.sample(state, rng)
if trans_stats is not None:
if trans_key not in chain_stats:
logger.warning(
f'Transition {trans_key} returned statistics '
f'but has no `statistic_types` attribute.')
for key, val in trans_stats.items():
if key in chain_stats[trans_key]:
chain_stats[trans_key][key][sample_index] = val
for key, chain_func in chain_var_funcs.items():
var = chain_func(state)
chains[key][sample_index] = var
except KeyboardInterrupt:
if memmap_enabled:
for chain in chains.values:
chain.flush()
for trans_stats in chain_stats.values():
for stat in trans_stats.values():
stat.flush()
else:
# If not interrupted increment sample_index so that it equals
# n_sample to flag chain completed sampling
sample_index += 1
if parallel_chains and memmap_enabled:
trace_filenames = self._memmaps_to_filenames(chains)
stats_filenames = self._memmaps_to_filenames(chain_stats)
return trace_filenames, stats_filenames, sample_index
return chains, chain_stats, sample_index