def train_model(args):
with open("tacotron/config.toml") as file:
cfg = toml.load(file)
tensorboard_path = Path("tensorboard") / args.checkpoint_dir
checkpoint_dir = Path(args.checkpoint_dir)
writer = SummaryWriter(tensorboard_path)
tacotron = Tacotron(**cfg["model"]).cuda()
optimizer = optim.Adam(tacotron.parameters(),
lr=cfg["train"]["optimizer"]["lr"])
scaler = amp.GradScaler()
scheduler = optim.lr_scheduler.MultiStepLR(
optimizer=optimizer,
milestones=cfg["train"]["scheduler"]["milestones"],
gamma=cfg["train"]["scheduler"]["gamma"],
)
if args.resume is not None:
global_step = load_checkpoint(
tacotron=tacotron,
optimizer=optimizer,
scaler=scaler,
scheduler=scheduler,
load_path=args.resume,
)
else:
global_step = 0
root_path = Path(args.dataset_dir)
text_path = Path(args.text_path)
dataset = TTSDataset(root_path, text_path)
sampler = samplers.RandomSampler(dataset)
batch_sampler = BucketBatchSampler(
sampler=sampler,
batch_size=cfg["train"]["batch_size"],
drop_last=True,
sort_key=dataset.sort_key,
bucket_size_multiplier=cfg["train"]["bucket_size_multiplier"],
)
collate_fn = partial(
pad_collate,
reduction_factor=cfg["model"]["decoder"]["reduction_factor"])
loader = DataLoader(
dataset,
batch_sampler=batch_sampler,
collate_fn=collate_fn,
num_workers=cfg["train"]["n_workers"],
pin_memory=True,
)
n_epochs = cfg["train"]["n_steps"] // len(loader) + 1
start_epoch = global_step // len(loader) + 1
for epoch in range(start_epoch, n_epochs + 1):
average_loss = 0
for i, (mels, texts, mel_lengths, text_lengths,
attn_flag) in enumerate(tqdm(loader), 1):
mels, texts = mels.cuda(), texts.cuda()
optimizer.zero_grad()
with amp.autocast():
ys, alphas = tacotron(texts, mels)
loss = F.l1_loss(ys, mels)
scaler.scale(loss).backward()
scaler.unscale_(optimizer)
clip_grad_norm_(tacotron.parameters(),
cfg["train"]["clip_grad_norm"])
scaler.step(optimizer)
scaler.update()
scheduler.step()
global_step += 1
average_loss += (loss.item() - average_loss) / i
if global_step % cfg["train"]["checkpoint_interval"] == 0:
save_checkpoint(
tacotron=tacotron,
optimizer=optimizer,
scaler=scaler,
scheduler=scheduler,
step=global_step,
checkpoint_dir=checkpoint_dir,
)
if attn_flag:
index = attn_flag[0]
alpha = alphas[
index, :text_lengths[index], :mel_lengths[index] // 2]
alpha = alpha.detach().cpu().numpy()
y = ys[index, :, :].detach().cpu().numpy()
log_alignment(alpha, y, cfg["preprocess"], writer, global_step)
writer.add_scalar("loss", average_loss, global_step)
print(
f"epoch {epoch} : loss {average_loss:.4f} : {scheduler.get_last_lr()}"
)
def train(
hyp, # path/to/hyp.yaml or hyp dictionary
opt,
device,
callbacks):
save_dir, epochs, batch_size, weights, single_cls, evolve, data, cfg, resume, noval, nosave, workers, freeze = \
Path(opt.save_dir), opt.epochs, opt.batch_size, opt.weights, opt.single_cls, opt.evolve, opt.data, opt.cfg, \
opt.resume, opt.noval, opt.nosave, opt.workers, opt.freeze
# Directories
w = save_dir / 'weights' # weights dir
(w.parent if evolve else w).mkdir(parents=True, exist_ok=True) # make dir
last, best = w / 'last.pt', w / 'best.pt'
# Hyperparameters
if isinstance(hyp, str):
with open(hyp, errors='ignore') as f:
hyp = yaml.safe_load(f) # load hyps dict
LOGGER.info(
colorstr('hyperparameters: ') + ', '.join(f'{k}={v}'
for k, v in hyp.items()))
# Save run settings
if not evolve:
with open(save_dir / 'hyp.yaml', 'w') as f:
yaml.safe_dump(hyp, f, sort_keys=False)
with open(save_dir / 'opt.yaml', 'w') as f:
yaml.safe_dump(vars(opt), f, sort_keys=False)
# Loggers
data_dict = None
if RANK in [-1, 0]:
loggers = Loggers(save_dir, weights, opt, hyp,
LOGGER) # loggers instance
if loggers.wandb:
data_dict = loggers.wandb.data_dict
if resume:
weights, epochs, hyp, batch_size = opt.weights, opt.epochs, opt.hyp, opt.batch_size
# Register actions
for k in methods(loggers):
callbacks.register_action(k, callback=getattr(loggers, k))
# Config
plots = not evolve # create plots
cuda = device.type != 'cpu'
init_seeds(1 + RANK)
with torch_distributed_zero_first(LOCAL_RANK):
data_dict = data_dict or check_dataset(data) # check if None
train_path, val_path = data_dict['train'], data_dict['val']
nc = 1 if single_cls else int(data_dict['nc']) # number of classes
names = ['item'] if single_cls and len(
data_dict['names']) != 1 else data_dict['names'] # class names
assert len(
names
) == nc, f'{len(names)} names found for nc={nc} dataset in {data}' # check
is_coco = isinstance(val_path, str) and val_path.endswith(
'coco/val2017.txt') # COCO dataset
# Model
check_suffix(weights, '.pt') # check weights
pretrained = weights.endswith('.pt')
if pretrained:
with torch_distributed_zero_first(LOCAL_RANK):
weights = attempt_download(
weights) # download if not found locally
ckpt = torch.load(weights, map_location='cpu'
) # load checkpoint to CPU to avoid CUDA memory leak
model = Model(cfg or ckpt['model'].yaml,
ch=3,
nc=nc,
anchors=hyp.get('anchors')).to(device) # create
exclude = [
'anchor'
] if (cfg or hyp.get('anchors')) and not resume else [] # exclude keys
csd = ckpt['model'].float().state_dict(
) # checkpoint state_dict as FP32
csd = intersect_dicts(csd, model.state_dict(),
exclude=exclude) # intersect
model.load_state_dict(csd, strict=False) # load
LOGGER.info(
f'Transferred {len(csd)}/{len(model.state_dict())} items from {weights}'
) # report
else:
model = Model(cfg, ch=3, nc=nc,
anchors=hyp.get('anchors')).to(device) # create
# Freeze
freeze = [
f'model.{x}.'
for x in (freeze if len(freeze) > 1 else range(freeze[0]))
] # layers to freeze
for k, v in model.named_parameters():
v.requires_grad = True # train all layers
if any(x in k for x in freeze):
LOGGER.info(f'freezing {k}')
v.requires_grad = False
# Image size
gs = max(int(model.stride.max()), 32) # grid size (max stride)
imgsz = check_img_size(opt.imgsz, gs,
floor=gs * 2) # verify imgsz is gs-multiple
# Batch size
if RANK == -1 and batch_size == -1: # single-GPU only, estimate best batch size
batch_size = check_train_batch_size(model, imgsz)
loggers.on_params_update({"batch_size": batch_size})
# Optimizer
nbs = 64 # nominal batch size
accumulate = max(round(nbs / batch_size),
1) # accumulate loss before optimizing
hyp['weight_decay'] *= batch_size * accumulate / nbs # scale weight_decay
LOGGER.info(f"Scaled weight_decay = {hyp['weight_decay']}")
g0, g1, g2 = [], [], [] # optimizer parameter groups
for v in model.modules():
if hasattr(v, 'bias') and isinstance(v.bias, nn.Parameter): # bias
g2.append(v.bias)
if isinstance(v, nn.BatchNorm2d): # weight (no decay)
g0.append(v.weight)
elif hasattr(v, 'weight') and isinstance(
v.weight, nn.Parameter): # weight (with decay)
g1.append(v.weight)
if opt.optimizer == 'Adam':
optimizer = Adam(g0, lr=hyp['lr0'],
betas=(hyp['momentum'],
0.999)) # adjust beta1 to momentum
elif opt.optimizer == 'AdamW':
optimizer = AdamW(g0, lr=hyp['lr0'],
betas=(hyp['momentum'],
0.999)) # adjust beta1 to momentum
else:
optimizer = SGD(g0,
lr=hyp['lr0'],
momentum=hyp['momentum'],
nesterov=True)
optimizer.add_param_group({
'params': g1,
'weight_decay': hyp['weight_decay']
}) # add g1 with weight_decay
optimizer.add_param_group({'params': g2}) # add g2 (biases)
LOGGER.info(
f"{colorstr('optimizer:')} {type(optimizer).__name__} with parameter groups "
f"{len(g0)} weight (no decay), {len(g1)} weight, {len(g2)} bias")
del g0, g1, g2
# Scheduler
if opt.cos_lr:
lf = one_cycle(1, hyp['lrf'], epochs) # cosine 1->hyp['lrf']
else:
lf = lambda x: (1 - x / epochs) * (1.0 - hyp['lrf']) + hyp['lrf'
] # linear
scheduler = lr_scheduler.LambdaLR(
optimizer,
lr_lambda=lf) # plot_lr_scheduler(optimizer, scheduler, epochs)
# EMA
ema = ModelEMA(model) if RANK in [-1, 0] else None
# Resume
start_epoch, best_fitness = 0, 0.0
if pretrained:
# Optimizer
if ckpt['optimizer'] is not None:
optimizer.load_state_dict(ckpt['optimizer'])
best_fitness = ckpt['best_fitness']
# EMA
if ema and ckpt.get('ema'):
ema.ema.load_state_dict(ckpt['ema'].float().state_dict())
ema.updates = ckpt['updates']
# Epochs
start_epoch = ckpt['epoch'] + 1
if resume:
assert start_epoch > 0, f'{weights} training to {epochs} epochs is finished, nothing to resume.'
if epochs < start_epoch:
LOGGER.info(
f"{weights} has been trained for {ckpt['epoch']} epochs. Fine-tuning for {epochs} more epochs."
)
epochs += ckpt['epoch'] # finetune additional epochs
del ckpt, csd
# DP mode
if cuda and RANK == -1 and torch.cuda.device_count() > 1:
LOGGER.warning(
'WARNING: DP not recommended, use torch.distributed.run for best DDP Multi-GPU results.\n'
'See Multi-GPU Tutorial at https://github.com/ultralytics/yolov5/issues/475 to get started.'
)
model = torch.nn.DataParallel(model)
# SyncBatchNorm
if opt.sync_bn and cuda and RANK != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
LOGGER.info('Using SyncBatchNorm()')
# Trainloader
train_loader, dataset = create_dataloader(
train_path,
imgsz,
batch_size // WORLD_SIZE,
gs,
single_cls,
hyp=hyp,
augment=True,
cache=None if opt.cache == 'val' else opt.cache,
rect=opt.rect,
rank=LOCAL_RANK,
workers=workers,
image_weights=opt.image_weights,
quad=opt.quad,
prefix=colorstr('train: '),
shuffle=True)
mlc = int(np.concatenate(dataset.labels, 0)[:, 0].max()) # max label class
nb = len(train_loader) # number of batches
assert mlc < nc, f'Label class {mlc} exceeds nc={nc} in {data}. Possible class labels are 0-{nc - 1}'
# Process 0
if RANK in [-1, 0]:
val_loader = create_dataloader(val_path,
imgsz,
batch_size // WORLD_SIZE * 2,
gs,
single_cls,
hyp=hyp,
cache=None if noval else opt.cache,
rect=True,
rank=-1,
workers=workers * 2,
pad=0.5,
prefix=colorstr('val: '))[0]
if not resume:
labels = np.concatenate(dataset.labels, 0)
# c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1. # frequency
# model._initialize_biases(cf.to(device))
if plots:
plot_labels(labels, names, save_dir)
# Anchors
if not opt.noautoanchor:
check_anchors(dataset,
model=model,
thr=hyp['anchor_t'],
imgsz=imgsz)
model.half().float() # pre-reduce anchor precision
callbacks.run('on_pretrain_routine_end')
# DDP mode
if cuda and RANK != -1:
model = DDP(model, device_ids=[LOCAL_RANK], output_device=LOCAL_RANK)
# Model attributes
nl = de_parallel(
model).model[-1].nl # number of detection layers (to scale hyps)
hyp['box'] *= 3 / nl # scale to layers
hyp['cls'] *= nc / 80 * 3 / nl # scale to classes and layers
hyp['obj'] *= (imgsz / 640)**2 * 3 / nl # scale to image size and layers
hyp['label_smoothing'] = opt.label_smoothing
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.class_weights = labels_to_class_weights(
dataset.labels, nc).to(device) * nc # attach class weights
model.names = names
# Start training
t0 = time.time()
nw = max(round(hyp['warmup_epochs'] * nb),
100) # number of warmup iterations, max(3 epochs, 100 iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
last_opt_step = -1
maps = np.zeros(nc) # mAP per class
results = (0, 0, 0, 0, 0, 0, 0
) # P, R, [email protected], [email protected], val_loss(box, obj, cls)
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
stopper = EarlyStopping(patience=opt.patience)
compute_loss = ComputeLoss(model) # init loss class
LOGGER.info(
f'Image sizes {imgsz} train, {imgsz} val\n'
f'Using {train_loader.num_workers * WORLD_SIZE} dataloader workers\n'
f"Logging results to {colorstr('bold', save_dir)}\n"
f'Starting training for {epochs} epochs...')
for epoch in range(
start_epoch, epochs
): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional, single-GPU only)
if opt.image_weights:
cw = model.class_weights.cpu().numpy() * (
1 - maps)**2 / nc # class weights
iw = labels_to_image_weights(dataset.labels,
nc=nc,
class_weights=cw) # image weights
dataset.indices = random.choices(range(dataset.n),
weights=iw,
k=dataset.n) # rand weighted idx
# Update mosaic border (optional)
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(3, device=device) # mean losses
if RANK != -1:
train_loader.sampler.set_epoch(epoch)
pbar = enumerate(train_loader)
LOGGER.info(
('\n' + '%10s' * 7) %
('Epoch', 'gpu_mem', 'box', 'obj', 'cls', 'labels', 'img_size'))
if RANK in [-1, 0]:
pbar = tqdm(
pbar, total=nb,
bar_format='{l_bar}{bar:10}{r_bar}{bar:-10b}') # progress bar
optimizer.zero_grad()
for i, (
imgs, targets, paths, _
) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float(
) / 255 # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# compute_loss.gr = np.interp(ni, xi, [0.0, 1.0]) # iou loss ratio (obj_loss = 1.0 or iou)
accumulate = max(
1,
np.interp(ni, xi, [1, nbs / batch_size]).round())
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x['lr'] = np.interp(ni, xi, [
hyp['warmup_bias_lr'] if j == 2 else 0.0,
x['initial_lr'] * lf(epoch)
])
if 'momentum' in x:
x['momentum'] = np.interp(
ni, xi, [hyp['warmup_momentum'], hyp['momentum']])
# Multi-scale
if opt.multi_scale:
sz = random.randrange(imgsz * 0.5,
imgsz * 1.5 + gs) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]
] # new shape (stretched to gs-multiple)
imgs = nn.functional.interpolate(imgs,
size=ns,
mode='bilinear',
align_corners=False)
# Forward
with amp.autocast(enabled=cuda):
pred = model(imgs) # forward
loss, loss_items = compute_loss(
pred, targets.to(device)) # loss scaled by batch_size
if RANK != -1:
loss *= WORLD_SIZE # gradient averaged between devices in DDP mode
if opt.quad:
loss *= 4.
# Backward
scaler.scale(loss).backward()
# Optimize
if ni - last_opt_step >= accumulate:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema:
ema.update(model)
last_opt_step = ni
# Log
if RANK in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1
) # update mean losses
mem = f'{torch.cuda.memory_reserved() / 1E9 if torch.cuda.is_available() else 0:.3g}G' # (GB)
pbar.set_description(('%10s' * 2 + '%10.4g' * 5) %
(f'{epoch}/{epochs - 1}', mem, *mloss,
targets.shape[0], imgs.shape[-1]))
callbacks.run('on_train_batch_end', ni, model, imgs, targets,
paths, plots, opt.sync_bn)
if callbacks.stop_training:
return
# end batch ------------------------------------------------------------------------------------------------
# Scheduler
lr = [x['lr'] for x in optimizer.param_groups] # for loggers
scheduler.step()
if RANK in [-1, 0]:
# mAP
callbacks.run('on_train_epoch_end', epoch=epoch)
ema.update_attr(model,
include=[
'yaml', 'nc', 'hyp', 'names', 'stride',
'class_weights'
])
final_epoch = (epoch + 1 == epochs) or stopper.possible_stop
if not noval or final_epoch: # Calculate mAP
results, maps, _ = val.run(data_dict,
batch_size=batch_size //
WORLD_SIZE * 2,
imgsz=imgsz,
model=ema.ema,
single_cls=single_cls,
dataloader=val_loader,
save_dir=save_dir,
plots=False,
callbacks=callbacks,
compute_loss=compute_loss)
# Update best mAP
fi = fitness(np.array(results).reshape(
1, -1)) # weighted combination of [P, R, [email protected], [email protected]]
if fi > best_fitness:
best_fitness = fi
log_vals = list(mloss) + list(results) + lr
callbacks.run('on_fit_epoch_end', log_vals, epoch, best_fitness,
fi)
# Save model
if (not nosave) or (final_epoch and not evolve): # if save
ckpt = {
'epoch': epoch,
'best_fitness': best_fitness,
'model': deepcopy(de_parallel(model)).half(),
'ema': deepcopy(ema.ema).half(),
'updates': ema.updates,
'optimizer': optimizer.state_dict(),
'wandb_id':
loggers.wandb.wandb_run.id if loggers.wandb else None,
'date': datetime.now().isoformat()
}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
if (epoch > 0) and (opt.save_period >
0) and (epoch % opt.save_period == 0):
torch.save(ckpt, w / f'epoch{epoch}.pt')
del ckpt
callbacks.run('on_model_save', last, epoch, final_epoch,
best_fitness, fi)
# Stop Single-GPU
if RANK == -1 and stopper(epoch=epoch, fitness=fi):
break
# Stop DDP TODO: known issues shttps://github.com/ultralytics/yolov5/pull/4576
# stop = stopper(epoch=epoch, fitness=fi)
# if RANK == 0:
# dist.broadcast_object_list([stop], 0) # broadcast 'stop' to all ranks
# Stop DPP
# with torch_distributed_zero_first(RANK):
# if stop:
# break # must break all DDP ranks
# end epoch ----------------------------------------------------------------------------------------------------
# end training -----------------------------------------------------------------------------------------------------
if RANK in [-1, 0]:
LOGGER.info(
f'\n{epoch - start_epoch + 1} epochs completed in {(time.time() - t0) / 3600:.3f} hours.'
)
for f in last, best:
if f.exists():
strip_optimizer(f) # strip optimizers
if f is best:
LOGGER.info(f'\nValidating {f}...')
results, _, _ = val.run(
data_dict,
batch_size=batch_size // WORLD_SIZE * 2,
imgsz=imgsz,
model=attempt_load(f, device).half(),
iou_thres=0.65 if is_coco else
0.60, # best pycocotools results at 0.65
single_cls=single_cls,
dataloader=val_loader,
save_dir=save_dir,
save_json=is_coco,
verbose=True,
plots=True,
callbacks=callbacks,
compute_loss=compute_loss) # val best model with plots
if is_coco:
callbacks.run('on_fit_epoch_end',
list(mloss) + list(results) + lr, epoch,
best_fitness, fi)
callbacks.run('on_train_end', last, best, plots, epoch, results)
LOGGER.info(f"Results saved to {colorstr('bold', save_dir)}")
torch.cuda.empty_cache()
return results
def train(n_gpus, rank, output_directory, epochs, optim_algo, learning_rate,
weight_decay, sigma, iters_per_checkpoint, batch_size, seed,
checkpoint_path, ignore_layers, include_layers, finetune_layers,
warmstart_checkpoint_path, with_tensorboard, grad_clip_val,
fp16_run):
fp16_run = bool(fp16_run)
torch.manual_seed(seed)
torch.cuda.manual_seed(seed)
if n_gpus > 1:
init_distributed(rank, n_gpus, **dist_config)
criterion = FlowtronLoss(sigma, bool(model_config['n_components']),
bool(model_config['use_gate_layer']))
model = Flowtron(**model_config).cuda()
if len(finetune_layers):
for name, param in model.named_parameters():
if name in finetune_layers:
param.requires_grad = True
else:
param.requires_grad = False
print("Initializing %s optimizer" % (optim_algo))
if optim_algo == 'Adam':
optimizer = torch.optim.Adam(model.parameters(),
lr=learning_rate,
weight_decay=weight_decay)
elif optim_algo == 'RAdam':
optimizer = RAdam(model.parameters(),
lr=learning_rate,
weight_decay=weight_decay)
else:
print("Unrecognized optimizer %s!" % (optim_algo))
exit(1)
# Load checkpoint if one exists
iteration = 0
if warmstart_checkpoint_path != "":
model = warmstart(warmstart_checkpoint_path, model)
if checkpoint_path != "":
model, optimizer, iteration = load_checkpoint(checkpoint_path, model,
optimizer, ignore_layers)
iteration += 1 # next iteration is iteration + 1
if n_gpus > 1:
model = apply_gradient_allreduce(model)
print(model)
scaler = amp.GradScaler(enabled=fp16_run)
train_loader, valset, collate_fn = prepare_dataloaders(
data_config, n_gpus, batch_size)
# Get shared output_directory ready
if rank == 0 and not os.path.isdir(output_directory):
os.makedirs(output_directory)
os.chmod(output_directory, 0o775)
print("Output directory", output_directory)
if with_tensorboard and rank == 0:
tboard_out_path = os.path.join(output_directory, 'logs')
print("Setting up Tensorboard log in %s" % (tboard_out_path))
logger = FlowtronLogger(tboard_out_path)
# force set the learning rate to what is specified
for param_group in optimizer.param_groups:
param_group['lr'] = learning_rate
model.train()
epoch_offset = max(0, int(iteration / len(train_loader)))
# ================ MAIN TRAINNIG LOOP! ===================
for epoch in range(epoch_offset, epochs):
print("Epoch: {}".format(epoch))
for batch in train_loader:
model.zero_grad()
mel, speaker_vecs, text, in_lens, out_lens, gate_target, attn_prior = batch
mel, speaker_vecs, text = mel.cuda(), speaker_vecs.cuda(
), text.cuda()
in_lens, out_lens, gate_target = in_lens.cuda(), out_lens.cuda(
), gate_target.cuda()
attn_prior = attn_prior.cuda() if valset.use_attn_prior else None
with amp.autocast(enabled=fp16_run):
z, log_s_list, gate_pred, attn, mean, log_var, prob = model(
mel, speaker_vecs, text, in_lens, out_lens, attn_prior)
loss_nll, loss_gate = criterion(
(z, log_s_list, gate_pred, mean, log_var, prob),
gate_target, out_lens)
loss = loss_nll + loss_gate
if n_gpus > 1:
reduced_loss = reduce_tensor(loss.data, n_gpus).item()
reduced_gate_loss = reduce_tensor(loss_gate.data,
n_gpus).item()
reduced_nll_loss = reduce_tensor(loss_nll.data, n_gpus).item()
else:
reduced_loss = loss.item()
reduced_gate_loss = loss_gate.item()
reduced_nll_loss = loss_nll.item()
scaler.scale(loss).backward()
if grad_clip_val > 0:
scaler.unscale_(optimizer)
torch.nn.utils.clip_grad_norm_(model.parameters(),
grad_clip_val)
scaler.step(optimizer)
scaler.update()
if rank == 0:
print("{}:\t{:.9f}".format(iteration, reduced_loss),
flush=True)
if with_tensorboard and rank == 0:
logger.add_scalar('training_loss', reduced_loss, iteration)
logger.add_scalar('training_loss_gate', reduced_gate_loss,
iteration)
logger.add_scalar('training_loss_nll', reduced_nll_loss,
iteration)
logger.add_scalar('learning_rate', learning_rate, iteration)
if iteration % iters_per_checkpoint == 0:
val_loss, val_loss_nll, val_loss_gate, attns, gate_pred, gate_target = compute_validation_loss(
model, criterion, valset, collate_fn, batch_size, n_gpus)
if rank == 0:
print("Validation loss {}: {:9f} ".format(
iteration, val_loss))
if with_tensorboard:
logger.log_validation(val_loss, val_loss_nll,
val_loss_gate, attns, gate_pred,
gate_target, iteration)
checkpoint_path = "{}/model_{}".format(
output_directory, iteration)
save_checkpoint(model, optimizer, learning_rate, iteration,
checkpoint_path)
iteration += 1
def train(args):
trainer = base_trainer.Trainer()
args, device = get_args(args)
args, log, tbx = trainer.setup(args)
# Get BPE
log.info("Loading BPE...")
bpe = get_bpe(args)
log.info("Loaded {} BPE tokens".format(len(bpe)))
# Get data loader
log.info("Building dataset...")
train_dataset, train_loader = get_dataset(args,
args.train_record_file,
bpe,
shuffle=True)
dev_dataset, dev_loader = get_dataset(args,
args.train_record_file,
bpe,
shuffle=False)
args.epoch_size = len(train_dataset)
log.info("Train has {} examples".format(args.epoch_size))
# Get model
log.info("Building model...")
model = get_model(args, bpe)
model = trainer.setup_model(model, device)
# Get optimizer, scheduler, and scaler
optimizer = optim.AdamW(
model.parameters(),
args.lr,
betas=(args.beta_1, args.beta_2),
eps=args.eps,
weight_decay=args.l2_wd,
)
get_num_steps(args)
log.info("Scheduler will decay over {} steps".format(args.num_steps))
scheduler = sched.get_linear_warmup_power_decay_scheduler(
optimizer, args.warmup_steps, args.num_steps, power=args.power_decay)
scaler = amp.GradScaler()
optimizer, scheduler, scaler = trainer.setup_optimizer(
optimizer, scheduler, scaler)
# Train
log.info("Training...")
model.train()
sample_num = 0
samples_till_eval = args.eval_per_n_samples
epoch = 0
step = 0
trainer.setup_saver()
trainer.setup_random()
sample_num, samples_till_eval, epoch, step = trainer.setup_step(
step_vars=(sample_num, samples_till_eval, epoch, step))
trainer.setup_close()
while epoch != args.num_epochs:
trainer.save_checkpoint(step_vars=(sample_num, samples_till_eval,
epoch, step))
epoch += 1
log.info(f"Starting epoch {epoch}...")
# Print histogram of weights every epoch
for tags, params in model.named_parameters():
tbx.add_histogram(tags, params.data, epoch)
with torch.enable_grad(), tqdm(
total=len(train_loader.dataset)) as progress_bar:
for x, y, _, _ in train_loader:
batch_size = x.size(0)
loss, loss_val, _ = forward(x, y, args, device, model)
loss = loss / args.gradient_accumulation
# Backward
scaler.scale(loss).backward()
if (step + 1) % args.gradient_accumulation == 0:
scaler.unscale_(optimizer)
nn.utils.clip_grad_norm_(model.parameters(),
args.max_grad_norm)
scaler.step(optimizer)
scaler.update()
scheduler.step()
optimizer.zero_grad()
# Log info
step += 1
sample_num += batch_size
progress_bar.update(batch_size)
progress_bar.set_postfix(epoch=epoch, NLL=loss_val)
tbx.add_scalar("train/NLL", loss_val, sample_num)
tbx.add_scalar("train/LR", optimizer.param_groups[0]["lr"],
sample_num)
tbx.add_scalar("train/steps",
step // args.gradient_accumulation, sample_num)
results, augs = augment(model, dev_loader, device, bpe, args)
for k, v in results.items():
tbx.add_scalar(f"dev/{k}", v, sample_num)
save(args.train_aug_file, augs, "train aug")
def run_train():
fold = 3
out_dir = \
'/root/share1/kaggle/2021/bms-moleular-translation/result/try10/resnet26d-224-transformer/fold%d-1' % fold
initial_checkpoint = \
out_dir + '/checkpoint/00098000_model.pth'#
#'/root/share1/kaggle/2021/bms-moleular-translation/result/try02/resnet26d-224-lstm/fold3/checkpoint/00036000_model.pth'
encoder_checkpoint = \
None #'/root/share1/kaggle/2021/bms-moleular-translation/result/try02/resnet26d-224/fold3-1/checkpoint/00204000_model.pth'
debug = 0
start_lr = 0.001 # 1
batch_size = 32 # 24
## setup ----------------------------------------
for f in ['checkpoint', 'train', 'valid', 'backup']:
os.makedirs(out_dir + '/' + f, exist_ok=True)
# backup_project_as_zip(PROJECT_PATH, out_dir +'/backup/code.train.%s.zip'%IDENTIFIER)
log = Logger()
log.open(out_dir + '/log.train.txt', mode='a')
log.write('\n--- [START %s] %s\n\n' % (IDENTIFIER, '-' * 64))
log.write('\t%s\n' % COMMON_STRING)
log.write('\t__file__ = %s\n' % __file__)
log.write('\tout_dir = %s\n' % out_dir)
log.write('\n')
## dataset ------------------------------------
df_train, df_valid = make_fold('train-%d' % fold)
tokenizer = load_tokenizer()
train_dataset = BmsDataset(df_train, tokenizer)
valid_dataset = BmsDataset(df_valid, tokenizer)
train_loader = DataLoader(
train_dataset,
sampler=RandomSampler(train_dataset),
batch_size=batch_size,
drop_last=True,
num_workers=0,
pin_memory=True,
collate_fn=null_collate,
)
valid_loader = DataLoader(
valid_dataset,
#sampler=SequentialSampler(valid_dataset),
sampler=FixNumSampler(valid_dataset, 5_000), #200_000 #5_000
batch_size=32,
drop_last=False,
num_workers=0,
pin_memory=True,
collate_fn=null_collate,
#collate_fn=lambda batch: null_collate(batch,False),
)
log.write('** dataset setting **\n')
log.write('train_dataset : \n%s\n' % (train_dataset))
log.write('valid_dataset : \n%s\n' % (valid_dataset))
log.write('\n')
## net ----------------------------------------
scaler = amp.GradScaler()
net = AmpNet().cuda()
if encoder_checkpoint is not None:
f = torch.load(encoder_checkpoint,
map_location=lambda storage, loc: storage)
encoder_state_dict = f['encoder_state_dict']
net.encoder.load_state_dict(encoder_state_dict, strict=False) # True
if initial_checkpoint is not None:
f = torch.load(initial_checkpoint,
map_location=lambda storage, loc: storage)
start_iteration = f['iteration']
start_epoch = f['epoch']
state_dict = f['state_dict']
#decoder_state_dict = f['decoder_state_dict']
#decoder_state_dict = { k.replace('image_pos','image_pos1'):v for k,v, in decoder_state_dict.items()}
net.load_state_dict(state_dict, strict=True) # True
else:
start_iteration = 0
start_epoch = 0
log.write('** net setting **\n')
log.write('encoder_checkpoint : %s\n' % (encoder_checkpoint))
log.write('initial_checkpoint : %s\n' % (initial_checkpoint))
log.write('\n')
# -----------------------------------------------
if 0: ##freeze
for p in net.encoder.parameters():
p.requires_grad = False
optimizer = Lookahead(RAdam(filter(lambda p: p.requires_grad,
net.parameters()),
lr=start_lr),
alpha=0.5,
k=5)
# optimizer = RAdam(filter(lambda p: p.requires_grad, net.parameters()),lr=start_lr)
num_iteration = 80000 * 1000
iter_log = 1000
iter_valid = 1000
iter_save = list(range(0, num_iteration, 1000)) # 1*1000
log.write('optimizer\n %s\n' % (optimizer))
log.write('\n')
## start training here! ##############################################
log.write('** start training here! **\n')
log.write(' is_mixed_precision = %s \n' % str(is_mixed_precision))
log.write(' batch_size = %d\n' % (batch_size))
log.write(' experiment = %s\n' % str(__file__.split('/')[-2:]))
log.write(
' |----- VALID ---|---- TRAIN/BATCH --------------\n'
)
log.write(
'rate iter epoch | loss lb(lev) | loss0 loss1 | time \n'
)
log.write(
'----------------------------------------------------------------------\n'
)
# 0.00000 0.00* 0.00 | 0.000 0.000 | 0.000 0.000 | 0 hr 00 min
def message(mode='print'):
if mode == ('print'):
asterisk = ' '
loss = batch_loss
if mode == ('log'):
asterisk = '*' if iteration in iter_save else ' '
loss = train_loss
text = \
'%0.5f %5.4f%s %4.2f | ' % (rate, iteration / 10000, asterisk, epoch,) + \
'%4.3f %4.3f | ' % (*valid_loss,) + \
'%4.3f %4.3f %4.3f | ' % (*loss,) + \
'%s' % (time_to_str(timer() - start_timer, 'min'))
return text
# ----
valid_loss = np.zeros(2, np.float32)
train_loss = np.zeros(3, np.float32)
batch_loss = np.zeros_like(train_loss)
sum_train_loss = np.zeros_like(train_loss)
sum_train = 0
loss0 = torch.FloatTensor([0]).cuda().sum()
loss1 = torch.FloatTensor([0]).cuda().sum()
loss2 = torch.FloatTensor([0]).cuda().sum()
start_timer = timer()
iteration = start_iteration
epoch = start_epoch
rate = 0
while iteration < num_iteration:
for t, batch in enumerate(train_loader):
if iteration in iter_save:
if iteration != start_iteration:
torch.save(
{
'state_dict': net.state_dict(),
'iteration': iteration,
'epoch': epoch,
},
out_dir + '/checkpoint/%08d_model.pth' % (iteration))
pass
if (iteration % iter_valid == 0):
#if iteration != start_iteration:
valid_loss = do_valid(net, tokenizer, valid_loader) #
pass
if (iteration % iter_log == 0):
print('\r', end='', flush=True)
log.write(message(mode='log') + '\n')
# learning rate schduler ------------
rate = get_learning_rate(optimizer)
# one iteration update -------------
batch_size = len(batch['index'])
image = batch['image'].cuda()
token = batch['token'].cuda()
length = batch['length']
# ----
net.train()
optimizer.zero_grad()
# encoder.eval()
# with torch.no_grad():
# image_embed = encoder(image)
if is_mixed_precision:
with amp.autocast():
#assert(False)
logit = data_parallel(net, (image, token, length))
loss0 = seq_cross_entropy_loss(logit, token, length)
#teacher forcing, exposure bias
if 0: #use wrong prediction as input
probability = F.softmax(logit, -1)
predict = logit.argmax(-1)
a = (torch.rand(token[:, 1:].shape) > 0.8).float(
).cuda() #<todo> sample according to probability
fake_token = token.clone()
fake_token[:, 1:] = a * fake_token[:, 1:] + (
1 - a) * predict[:, :-1]
logit1 = data_parallel(net,
(image, fake_token, length))
loss1 = seq_cross_entropy_loss(logit1, token, length)
pass
scaler.scale(loss0).backward()
# scaler.scale(loss1).backward()
# scaler.scale(loss0 + 0.1*loss1).backward()
#scaler.unscale_(optimizer)
#torch.nn.utils.clip_grad_norm_(net.parameters(), 2)
scaler.step(optimizer)
scaler.update()
else:
assert False
# print('fp32')
logit = net(image, token, length)
loss0 = seq_cross_entropy_loss(logit, token, length)
(loss0).backward()
optimizer.step()
# print statistics --------
epoch += 1 / len(train_loader)
iteration += 1
batch_loss = np.array([loss0.item(), loss1.item(), loss2.item()])
sum_train_loss += batch_loss
sum_train += 1
if iteration % 100 == 0:
train_loss = sum_train_loss / (sum_train + 1e-12)
sum_train_loss[...] = 0
sum_train = 0
print('\r', end='', flush=True)
print(message(mode='print'), end='', flush=True)
# debug--------------------------
if debug:
pass
log.write('\n')
def main(_A: argparse.Namespace):
if _A.num_gpus_per_machine == 0:
# Set device as CPU if num_gpus_per_machine = 0.
device: Any = torch.device("cpu")
else:
# Get the current device as set for current distributed process.
# Check `launch` function in `virtex.utils.distributed` module.
device = torch.cuda.current_device()
# Create a config object (this will be immutable) and perform common setup
# such as logging and setting up serialization directory.
_C = Config(_A.config, _A.config_override)
common_setup(_C, _A)
# -------------------------------------------------------------------------
# INSTANTIATE DATALOADER, MODEL, OPTIMIZER, SCHEDULER
# -------------------------------------------------------------------------
train_dataset = PretrainingDatasetFactory.from_config(_C, split="train")
val_dataset = PretrainingDatasetFactory.from_config(_C, split="val")
# Make `DistributedSampler`s to shard datasets across GPU processes.
# Skip this if training on CPUs.
train_sampler = (
DistributedSampler(train_dataset, shuffle=True) # type: ignore
if _A.num_gpus_per_machine > 0 else None)
val_sampler = (
DistributedSampler(val_dataset, shuffle=False) # type: ignore
if _A.num_gpus_per_machine > 0 else None)
train_dataloader = DataLoader(
train_dataset,
batch_size=_C.OPTIM.BATCH_SIZE // dist.get_world_size(),
sampler=train_sampler,
shuffle=train_sampler is None,
num_workers=_A.cpu_workers,
pin_memory=True,
drop_last=True,
collate_fn=train_dataset.collate_fn,
)
val_dataloader = DataLoader(
val_dataset,
batch_size=_C.OPTIM.BATCH_SIZE // dist.get_world_size(),
sampler=val_sampler,
shuffle=False,
num_workers=_A.cpu_workers,
pin_memory=True,
drop_last=False,
collate_fn=val_dataset.collate_fn,
)
model = PretrainingModelFactory.from_config(_C).to(device)
optimizer = OptimizerFactory.from_config(_C, model.named_parameters())
scheduler = LRSchedulerFactory.from_config(_C, optimizer)
# -------------------------------------------------------------------------
# BEFORE TRAINING STARTS
# -------------------------------------------------------------------------
# Create a gradient scaler for automatic mixed precision.
scaler = amp.GradScaler(enabled=_C.AMP)
# Load checkpoint to resume training if specified.
if _A.resume_from is not None:
start_iteration = CheckpointManager(
model=model,
optimizer=optimizer,
scheduler=scheduler,
scaler=scaler,
).load(_A.resume_from)
else:
start_iteration = 0
# Create an iterator from dataloader to sample batches perpetually.
train_dataloader_iter = cycle(train_dataloader, device, start_iteration)
# Wrap model in DDP if using more than one processes.
if dist.get_world_size() > 1:
dist.synchronize()
model = nn.parallel.DistributedDataParallel(
model, device_ids=[device], find_unused_parameters=True)
# Keep track of time per iteration and ETA.
timer = Timer(start_from=start_iteration + 1,
total_iterations=_C.OPTIM.NUM_ITERATIONS)
# Create tensorboard writer and checkpoint manager (only in master process).
if dist.is_master_process():
tensorboard_writer = SummaryWriter(log_dir=_A.serialization_dir)
tensorboard_writer.add_text("config", f"```\n{_C}\n```")
checkpoint_manager = CheckpointManager(
_A.serialization_dir,
model=model,
optimizer=optimizer,
scheduler=scheduler,
scaler=scaler,
)
# -------------------------------------------------------------------------
# TRAINING LOOP
# -------------------------------------------------------------------------
for iteration in range(start_iteration + 1, _C.OPTIM.NUM_ITERATIONS + 1):
timer.tic()
optimizer.zero_grad()
batch = next(train_dataloader_iter)
with amp.autocast(enabled=_C.AMP):
output_dict = model(batch)
loss = output_dict["loss"]
scaler.scale(loss).backward()
# First clip norm of gradients, and then perform optimizer step.
scaler.unscale_(optimizer)
torch.nn.utils.clip_grad_norm_(model.parameters(),
_C.OPTIM.CLIP_GRAD_NORM)
scaler.step(optimizer)
scaler.update()
scheduler.step()
timer.toc()
# ---------------------------------------------------------------------
# LOGGING
# ---------------------------------------------------------------------
if iteration % _A.log_every == 0:
logger.info(
f"{timer.stats} [Loss {loss:.3f}] [GPU {dist.gpu_mem_usage()} MB]"
)
if dist.is_master_process():
tensorboard_writer.add_scalars(
"learning_rate",
{
"visual": optimizer.param_groups[0]["lr"],
"common": optimizer.param_groups[-1]["lr"],
},
iteration,
)
tensorboard_writer.add_scalars("train",
output_dict["loss_components"],
iteration)
# ---------------------------------------------------------------------
# VALIDATION
# ---------------------------------------------------------------------
if iteration % _A.checkpoint_every == 0:
if dist.is_master_process():
checkpoint_manager.step(iteration)
# All processes will wait till master process is done serializing.
dist.synchronize()
torch.set_grad_enabled(False)
model.eval()
# Accumulate different val loss components according to the type of
# pretraining model.
val_loss_counter: Counter = Counter()
for val_iteration, val_batch in enumerate(val_dataloader, start=1):
for key in val_batch:
val_batch[key] = val_batch[key].to(device)
output_dict = model(val_batch)
val_loss_counter.update(output_dict["loss_components"])
# Divide each loss component by number of val batches per GPU.
val_loss_dict = {
k: v / val_iteration
for k, v in dict(val_loss_counter).items()
}
dist.average_across_processes(val_loss_dict)
torch.set_grad_enabled(True)
model.train()
logger.info(f"Iteration: {iteration} [Val loss: {val_loss_dict}]")
if dist.is_master_process():
tensorboard_writer.add_scalars("val", val_loss_dict, iteration)
def train_one_epoch(model, train_loader, losses, optimizer, scheduler, epoch):
global batch_step
epoch_start_time = time.time()
logger.info(
'training', 'Start training epoch-{}, lr={:.6}'.format(
epoch, get_lr_from_optim(optimizer)))
scaler = amp.GradScaler()
model.train()
history = collections.defaultdict(list)
for i, (imgs, labels) in enumerate(train_loader):
batch = i + 1
batch_start_time = time.time()
imgs, labels = imgs.cuda(), labels.cuda()
with amp.autocast():
f_bn, p, f_mask = model(imgs)
ce_loss = losses['cross_entropy_loss'](p, labels)
triplet_hard_loss, _ = losses['triplet_hard_loss'](f_bn, f_mask,
labels)
loss = Config.weight_ce * ce_loss
loss += Config.weight_tri * triplet_hard_loss
scaler.scale(loss).backward()
scaler.step(optimizer)
scaler.update()
optimizer.zero_grad()
sortmask = torch.sort(f_mask, dim=1)[0]
bottom20mean = sortmask[:, :20].mean()
top20mean = sortmask[:, -20:].mean()
acc = accuracy(p, labels)[0]
batch_end_time = time.time()
time_spent = batch_end_time - batch_start_time
dist_ap, dist_an = losses['triplet_hard_loss'].get_mean_hard_dist()
perform = {
'ce_loss': float(Config.weight_ce * ce_loss),
'triplet_hard_loss_a':
float(Config.weight_tri * triplet_hard_loss),
'dist_ap_hard': float(dist_ap),
'dist_an_hard': float(dist_an),
'accuracy': float(acc),
'mtop20': float(top20mean),
'mbot20': float(bottom20mean),
'time(s)': float(time_spent)
}
if i % Config.batch_per_log == 0:
stage = (epoch, batch)
text = ''
for k, v in perform.items():
text += '|{}:{:<8.4f} '.format(k, float(v))
logger.info('training', text, stage=stage)
for k, v in perform.items():
history[k].append(float(v))
if k != 'time(s)':
logger.add_scalar('TRAIN_b/' + k, v, batch_step)
batch_step += 1
scheduler.step()
epoch_end_time = time.time()
time_spent = sec2min_sec(epoch_start_time, epoch_end_time)
text = 'Finish training epoch {}, time spent: {}mins {}secs, performance:\n##'.format(
epoch, time_spent[0], time_spent[1])
for k, vlist in history.items():
v = mean(vlist)
text += '|{}:{:>5.4f} '.format(k, v)
if k != 'time(s)':
logger.add_scalar('TRAIN_e/' + k, v, epoch)
logger.info('training', text)
def __init__(self, args):
self.args = args
# Set random initialization seed, easy to reproduce.
init_torch_seeds(args.manualSeed)
logger.info("Load training dataset")
# Selection of appropriate treatment equipment.
train_dataset = BaseTrainDataset(root=os.path.join(args.data, "train"))
test_dataset = BaseTestDataset(root=os.path.join(args.data, "test"),
image_size=args.image_size)
self.train_dataloader = torch.utils.data.DataLoader(
train_dataset,
batch_size=args.batch_size,
shuffle=True,
pin_memory=True,
num_workers=int(args.workers))
self.test_dataloader = torch.utils.data.DataLoader(
test_dataset,
batch_size=args.batch_size,
shuffle=False,
pin_memory=True,
num_workers=int(args.workers))
logger.info(
f"Train Dataset information:\n"
f"\tTrain Dataset dir is `{os.getcwd()}/{args.data}/train`\n"
f"\tBatch size is {args.batch_size}\n"
f"\tWorkers is {int(args.workers)}\n"
f"\tLoad dataset to CUDA")
logger.info(f"Test Dataset information:\n"
f"\tTest Dataset dir is `{os.getcwd()}/{args.data}/test`\n"
f"\tBatch size is {args.batch_size}\n"
f"\tWorkers is {int(args.workers)}\n"
f"\tLoad dataset to CUDA")
# Construct network architecture model of generator and discriminator.
self.device = select_device(args.device, batch_size=1)
if args.pretrained:
logger.info(f"Using pre-trained model `{args.arch}`")
self.generator = models.__dict__[args.arch](pretrained=True).to(
self.device)
else:
logger.info(f"Creating model `{args.arch}`")
self.generator = models.__dict__[args.arch]().to(self.device)
logger.info(f"Creating discriminator model")
self.discriminator = discriminator().to(self.device)
# Parameters of pre training model.
self.start_psnr_epoch = math.floor(args.start_psnr_iter /
len(self.train_dataloader))
self.psnr_epochs = math.ceil(args.psnr_iters /
len(self.train_dataloader))
self.psnr_optimizer = torch.optim.Adam(self.generator.parameters(),
lr=args.lr,
betas=(0.9, 0.999))
logger.info(f"Pre-training model training parameters:\n"
f"\tIters is {args.psnr_iters}\n"
f"\tEpoch is {self.psnr_epochs}\n"
f"\tOptimizer Adam\n"
f"\tLearning rate {args.lr}\n"
f"\tBetas (0.9, 0.999)")
# Create a SummaryWriter at the beginning of training.
self.psnr_writer = SummaryWriter(
f"runs/SRResNet_{int(time.time())}_logs")
self.gan_writer = SummaryWriter(f"runs/SRGAN_{int(time.time())}_logs")
# Creates a GradScaler once at the beginning of training.
self.scaler = amp.GradScaler()
logger.info(f"Turn on mixed precision training.")
# Parameters of GAN training model.
self.start_epoch = math.floor(args.start_iter /
len(self.train_dataloader))
self.epochs = math.ceil(args.iters / len(self.train_dataloader))
self.discriminator_optimizer = torch.optim.Adam(
self.discriminator.parameters(), lr=args.lr, betas=(0.9, 0.999))
self.generator_optimizer = torch.optim.Adam(
self.generator.parameters(), lr=args.lr, betas=(0.9, 0.999))
self.discriminator_scheduler = torch.optim.lr_scheduler.StepLR(
self.discriminator_optimizer,
step_size=self.epochs // 2,
gamma=0.1)
self.generator_scheduler = torch.optim.lr_scheduler.StepLR(
self.generator_optimizer, step_size=self.epochs // 2, gamma=0.1)
logger.info(f"All model training parameters:\n"
f"\tIters is {args.iters}\n"
f"\tEpoch is {self.epochs}\n"
f"\tOptimizer is Adam\n"
f"\tLearning rate is {args.lr}\n"
f"\tBetas is (0.9, 0.999)\n"
f"\tScheduler is StepLR")
# Loss = pixel loss + 0.006 * perceptual loss + 0.001 * adversarial loss.
self.pixel_criterion = nn.MSELoss().to(self.device)
self.adversarial_criterion = nn.BCELoss().to(self.device)
self.perceptual_criterion = VGGLoss().to(self.device)
# LPIPS Evaluating.
self.lpips_criterion = lpips.LPIPS(net="vgg",
verbose=False).to(self.device)
logger.info(f"Loss function:\n"
f"\tPixel loss is MSELoss\n"
f"\tPerceptual loss is VGGLoss\n"
f"\tAdversarial loss is BCELoss")
def fit(
model: nn.Module,
epochs: int,
train_loader,
val_loader,
device: str,
optimizer,
scheduler=None,
num_batches: int = None,
log_interval: int = 100,
fp16: bool = False,
):
"""
A fit function that performs training for certain number of epochs.
Args:
model : A pytorch Faster RCNN Model.
epochs: Number of epochs to train.
train_loader : Train loader.
val_loader : Validation loader.
device : "cuda" or "cpu"
optimizer : PyTorch optimizer.
scheduler : (optional) Learning Rate scheduler.
early_stopper: (optional) A utils provided early stopper, based on validation loss.
num_batches : (optional) Integer To limit validation to certain number of batches.
log_interval : (optional) Defualt 100. Integer to Log after specified batch ids in every batch.
fp16 : (optional) To use Mixed Precision Training using float16 dtype.
"""
history = {}
train_loss = []
val_iou = []
val_giou = []
if fp16 is True:
print("Training with Mixed precision fp16 scaler")
scaler = amp.GradScaler()
else:
scaler = None
for epoch in tqdm(range(epochs)):
print()
print(f"Training Epoch = {epoch}")
train_metrics = train_step(model, train_loader, device, optimizer,
scheduler, num_batches, log_interval,
scaler)
val_metrics = val_step(model, val_loader, device, num_batches,
log_interval)
# Possibly we can use individual losses
train_loss.append(train_metrics["total_loss"])
avg_iou = val_metrics["iou"]
avg_giou = val_metrics["giou"]
val_iou.append(avg_iou)
val_giou.append(avg_giou)
history = {
"train": {
"train_loss": train_loss
},
"val": {
"val_iou": val_iou,
"val_giou": val_giou
}
}
return history
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
device = self.device
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
if args.optimizer == "AdamW":
optimizer = AdamW(optimizer_grouped_parameters, lr=args.learning_rate, eps=args.adam_epsilon)
elif args.optimizer == "Adafactor":
optimizer = Adafactor(
optimizer_grouped_parameters,
lr=args.learning_rate,
eps=args.adafactor_eps,
clip_threshold=args.adafactor_clip_threshold,
decay_rate=args.adafactor_decay_rate,
beta1=args.adafactor_beta1,
weight_decay=args.weight_decay,
scale_parameter=args.adafactor_scale_parameter,
relative_step=args.adafactor_relative_step,
warmup_init=args.adafactor_warmup_init,
)
print("Using Adafactor for T5")
else:
raise ValueError(
"{} is not a valid optimizer class. Please use one of ('AdamW', 'Adafactor') instead.".format(
args.optimizer
)
)
if args.scheduler == "constant_schedule":
scheduler = get_constant_schedule(optimizer)
elif args.scheduler == "constant_schedule_with_warmup":
scheduler = get_constant_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps)
elif args.scheduler == "linear_schedule_with_warmup":
scheduler = get_linear_schedule_with_warmup(
optimizer, num_warmup_steps=args.warmup_steps, num_training_steps=t_total
)
elif args.scheduler == "cosine_schedule_with_warmup":
scheduler = get_cosine_schedule_with_warmup(
optimizer,
num_warmup_steps=args.warmup_steps,
num_training_steps=t_total,
num_cycles=args.cosine_schedule_num_cycles,
)
elif args.scheduler == "cosine_with_hard_restarts_schedule_with_warmup":
scheduler = get_cosine_with_hard_restarts_schedule_with_warmup(
optimizer,
num_warmup_steps=args.warmup_steps,
num_training_steps=t_total,
num_cycles=args.cosine_schedule_num_cycles,
)
elif args.scheduler == "polynomial_decay_schedule_with_warmup":
scheduler = get_polynomial_decay_schedule_with_warmup(
optimizer,
num_warmup_steps=args.warmup_steps,
num_training_steps=t_total,
lr_end=args.polynomial_decay_schedule_lr_end,
power=args.polynomial_decay_schedule_lr_end,
)
else:
raise ValueError("{} is not a valid scheduler.".format(args.scheduler))
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
training_progress_scores = None
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:
from torch.cuda import amp
scaler = amp.GradScaler()
for current_epoch in train_iterator:
model.train()
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)
if args.fp16:
with amp.autocast():
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
else:
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)
if args.optimizer == "AdamW":
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_last_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 or self.is_sweeping:
wandb.log(
{
"Training loss": current_loss,
"lr": scheduler.get_last_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 or self.is_sweeping:
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, 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]
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
if not self.args.evaluate_during_training
else training_progress_scores,
)
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, 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
if not self.args.evaluate_during_training
else training_progress_scores,
)
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 and args.evaluate_each_epoch:
results = self.eval_model(
eval_data,
verbose=verbose and args.evaluate_during_training_verbose,
silent=args.evaluate_during_training_silent,
**kwargs,
)
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 or self.is_sweeping:
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, 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]
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
if not self.args.evaluate_during_training
else training_progress_scores,
)
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, 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
if not self.args.evaluate_during_training
else training_progress_scores,
)
return (
global_step,
tr_loss / global_step if not self.args.evaluate_during_training else training_progress_scores,
)
def with_amp(self, **kwargs):
self.use_amp = True
self.amp_scaler = amp.GradScaler(**kwargs)
return self
def train(hyp, opt, device, tb_writer=None):
print(f'Hyperparameters {hyp}')
log_dir = tb_writer.log_dir if tb_writer else 'runs/evolve' # run directory
wdir = str(Path(log_dir) / 'weights') + os.sep # weights directory
os.makedirs(wdir, exist_ok=True)
last = wdir + 'last.pt'
best = wdir + 'best.pt'
results_file = log_dir + os.sep + 'results.txt'
epochs, batch_size, total_batch_size, weights, rank = \
opt.epochs, opt.batch_size, opt.total_batch_size, opt.weights, opt.local_rank
# Save run settings
with open(Path(log_dir) / 'hyp.yaml', 'w') as f:
yaml.dump(hyp, f, sort_keys=False)
with open(Path(log_dir) / 'opt.yaml', 'w') as f:
yaml.dump(vars(opt), f, sort_keys=False)
# Configure
cuda = device.type != 'cpu'
init_seeds(2 + rank)
with open(opt.data) as f:
data_dict = yaml.load(f, Loader=yaml.FullLoader) # model dict
# train_path = data_dict['train']
train_path = f'{opt.trainset_path}/images/train'
# test_path = data_dict['val']
test_path = f'{opt.trainset_path}/images/test'
nc, names = (1, ['item']) if opt.single_cls else (int(
data_dict['nc']), data_dict['names']) # number classes, names
assert len(names) == nc, '%g names found for nc=%g dataset in %s' % (
len(names), nc, opt.data) # check
# Remove previous results
if rank in [-1, 0]:
for f in glob.glob('*_batch*.jpg') + glob.glob(results_file):
os.remove(f)
# Create model
if opt.not_use_SE:
model = Model(opt.cfg, nc=nc).to(device)
else:
model = ModelSE(opt.cfg, nc=nc).to(device)
print(model)
exit()
# Image sizes
gs = int(max(model.stride)) # grid size (max stride)
imgsz, imgsz_test = [check_img_size(x, gs) for x in opt.img_size
] # verify imgsz are gs-multiples
# Optimizer
nbs = 64 # nominal batch size
# default DDP implementation is slow for accumulation according to: https://pytorch.org/docs/stable/notes/ddp.html
# all-reduce operation is carried out during loss.backward().
# Thus, there would be redundant all-reduce communications in a accumulation procedure,
# which means, the result is still right but the training speed gets slower.
# in https://github.com/NVIDIA/DeepLearningExamples/blob/master/PyTorch/LanguageModeling/BERT/run_pretraining.py
accumulate = max(round(nbs / total_batch_size),
1) # accumulate loss before optimizing
hyp['weight_decay'] *= total_batch_size * accumulate / nbs # scale weight_decay
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_parameters():
if v.requires_grad:
if '.bias' in k:
pg2.append(v) # biases
elif '.weight' in k and '.bn' not in k:
pg1.append(v) # apply weight decay
else:
pg0.append(v) # all else
if opt.adam:
optimizer = optim.Adam(pg0,
lr=hyp['lr0'],
betas=(hyp['momentum'],
0.999)) # adjust beta1 to momentum
else:
optimizer = optim.SGD(pg0,
lr=hyp['lr0'],
momentum=hyp['momentum'],
nesterov=True)
optimizer.add_param_group({
'params': pg1,
'weight_decay': hyp['weight_decay']
}) # add pg1 with weight_decay
optimizer.add_param_group({'params': pg2}) # add pg2 (biases)
print('Optimizer groups: %g .bias, %g conv.weight, %g other' %
(len(pg2), len(pg1), len(pg0)))
del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
# https://pytorch.org/docs/stable/_modules/torch/optim/lr_scheduler.html#OneCycleLR
lf = lambda x: ((
(1 + math.cos(x * math.pi / epochs)) / 2)**1.0) * 0.8 + 0.2 # cosine
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs)
# Load Model
with torch_distributed_zero_first(rank):
attempt_download(weights)
start_epoch, best_fitness = 0, 0.0
if weights.endswith('.pt'): # pytorch format
ckpt = torch.load(weights, map_location=device) # load checkpoint
# load model
try:
exclude = ['anchor'] # exclude keys
ckpt['model'] = {
k: v
for k, v in ckpt['model'].float().state_dict().items()
if k in model.state_dict() and not any(x in k for x in exclude)
and model.state_dict()[k].shape == v.shape
}
model.load_state_dict(ckpt['model'], strict=False)
print('Transferred %g/%g items from %s' %
(len(ckpt['model']), len(model.state_dict()), weights))
except KeyError as e:
s = "%s is not compatible with %s. This may be due to model differences or %s may be out of date. " \
"Please delete or update %s and try again, or use --weights '' to train from scratch." \
% (weights, opt.cfg, weights, weights)
raise KeyError(s) from e
# load optimizer
if ckpt['optimizer'] is not None:
optimizer.load_state_dict(ckpt['optimizer'])
best_fitness = ckpt['best_fitness']
# load results
if ckpt.get('training_results') is not None:
with open(results_file, 'w') as file:
file.write(ckpt['training_results']) # write results.txt
# epochs
start_epoch = ckpt['epoch'] + 1
if epochs < start_epoch:
print(
'%s has been trained for %g epochs. Fine-tuning for %g additional epochs.'
% (weights, ckpt['epoch'], epochs))
epochs += ckpt['epoch'] # finetune additional epochs
del ckpt
# DP mode
if cuda and rank == -1 and torch.cuda.device_count() > 1:
# model = torch.nn.DataParallel(model)
model = torch.nn.DataParallel(model, device_ids=[0, 1])
# SyncBatchNorm
if opt.sync_bn and cuda and rank != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
print('Using SyncBatchNorm()')
# Exponential moving average
ema = ModelEMA(model) if rank in [-1, 0] else None
# DDP mode
if cuda and rank != -1:
model = DDP(model, device_ids=[rank], output_device=rank)
# Trainloader
dataloader, dataset = create_dataloader(train_path,
imgsz,
batch_size,
gs,
opt,
hyp=hyp,
augment=True,
cache=opt.cache_images,
rect=opt.rect,
local_rank=rank,
world_size=opt.world_size)
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches
assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (
mlc, nc, opt.data, nc - 1)
# Testloaderc
if rank in [-1, 0]:
# local_rank is set to -1. Because only the first process is expected to do evaluation.
testloader = create_dataloader(test_path,
imgsz_test,
total_batch_size,
gs,
opt,
hyp=hyp,
augment=False,
cache=opt.cache_images,
rect=True,
local_rank=-1,
world_size=opt.world_size)[0]
# Model parameters
hyp['cls'] *= nc / 80. # scale coco-tuned hyp['cls'] to current dataset
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.gr = 1.0 # giou loss ratio (obj_loss = 1.0 or giou)
model.class_weights = labels_to_class_weights(dataset.labels, nc).to(
device) # attach class weights
model.names = names
# Class frequency
if rank in [-1, 0]:
labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1.
# model._initialize_biases(cf.to(device))
plot_labels(labels, save_dir=log_dir)
if tb_writer:
# tb_writer.add_hparams(hyp, {}) # causes duplicate https://github.com/ultralytics/yolov5/pull/384
tb_writer.add_histogram('classes', c, 0)
# Check anchors
if not opt.noautoanchor:
check_anchors(dataset,
model=model,
thr=hyp['anchor_t'],
imgsz=imgsz)
# Start training
t0 = time.time()
nw = max(3 * nb,
1e3) # number of warmup iterations, max(3 epochs, 1k iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
maps = np.zeros(nc) # mAP per class
results = (
0, 0, 0, 0, 0, 0, 0
) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
if rank in [0, -1]:
print('Image sizes %g train, %g test' % (imgsz, imgsz_test))
print('Using %g dataloader workers' % dataloader.num_workers)
print('Starting training for %g epochs...' % epochs)
# torch.autograd.set_detect_anomaly(True)
for epoch in range(
start_epoch, epochs
): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional)
if dataset.image_weights:
# Generate indices
if rank in [-1, 0]:
w = model.class_weights.cpu().numpy() * (
1 - maps)**2 # class weights
image_weights = labels_to_image_weights(dataset.labels,
nc=nc,
class_weights=w)
dataset.indices = random.choices(
range(dataset.n), weights=image_weights,
k=dataset.n) # rand weighted idx
# Broadcast if DDP
if rank != -1:
indices = torch.zeros([dataset.n], dtype=torch.int)
if rank == 0:
indices[:] = torch.from_tensor(dataset.indices,
dtype=torch.int)
dist.broadcast(indices, 0)
if rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(4, device=device) # mean losses
if rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
if rank in [-1, 0]:
print(
('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'GIoU', 'obj',
'cls', 'total', 'targets', 'img_size'))
pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (
imgs, targets, paths, _
) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float(
) / 255.0 # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # giou loss ratio (obj_loss = 1.0 or giou)
accumulate = max(
1,
np.interp(ni, xi, [1, nbs / total_batch_size]).round())
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x['lr'] = np.interp(
ni, xi,
[0.1 if j == 2 else 0.0, x['initial_lr'] * lf(epoch)])
if 'momentum' in x:
x['momentum'] = np.interp(ni, xi,
[0.9, hyp['momentum']])
# Multi-scale
if opt.multi_scale:
sz = random.randrange(imgsz * 0.5,
imgsz * 1.5 + gs) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]
] # new shape (stretched to gs-multiple)
imgs = F.interpolate(imgs,
size=ns,
mode='bilinear',
align_corners=False)
# Autocast
with amp.autocast(enabled=cuda):
# Forward
pred = model(imgs)
# print([x.shape for x in pred]) # [1, 3, 76, 76, 25] [1, 3, 38, 38, 25] [1, 3, 19, 19, 25])
# Loss
loss, loss_items = compute_loss(pred, targets.to(device),
model) # scaled by batch_size
if rank != -1:
loss *= opt.world_size # gradient averaged between devices in DDP mode
# if not torch.isfinite(loss):
# print('WARNING: non-finite loss, ending training ', loss_items)
# return results
# Backward
scaler.scale(loss).backward()
# Optimize
if ni % accumulate == 0:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema is not None:
ema.update(model)
# Print
if rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1
) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_reserved() / 1E9
if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 +
'%10.4g' * 6) % ('%g/%g' % (epoch, epochs - 1), mem,
*mloss, targets.shape[0], imgs.shape[-1])
pbar.set_description(s)
# Plot
if ni < 3:
f = str(Path(log_dir) /
('train_batch%g.jpg' % ni)) # filename
result = plot_images(images=imgs,
targets=targets,
paths=paths,
fname=f)
if tb_writer and result is not None:
tb_writer.add_image(f,
result,
dataformats='HWC',
global_step=epoch)
# tb_writer.add_graph(model, imgs) # add model to tensorboard
# end batch ------------------------------------------------------------------------------------------------
# Scheduler
scheduler.step()
# DDP process 0 or single-GPU
if rank in [-1, 0]:
# mAP
if ema is not None:
ema.update_attr(
model,
include=['yaml', 'nc', 'hyp', 'gr', 'names', 'stride'])
final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP
results, maps, times = test.test(
opt.data,
batch_size=total_batch_size,
imgsz=imgsz_test,
save_json=final_epoch
and opt.data.endswith(os.sep + 'coco.yaml'),
model=ema.ema.module
if hasattr(ema.ema, 'module') else ema.ema,
single_cls=opt.single_cls,
dataloader=testloader,
save_dir=log_dir)
# Write
with open(results_file, 'a') as f:
f.write(s + '%10.4g' * 7 % results +
'\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(opt.name) and opt.bucket:
os.system('gsutil cp %s gs://%s/results/results%s.txt' %
(results_file, opt.bucket, opt.name))
# Tensorboard
if tb_writer:
tags = [
'train/giou_loss', 'train/obj_loss', 'train/cls_loss',
'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5',
'metrics/mAP_0.5:0.95', 'val/giou_loss', 'val/obj_loss',
'val/cls_loss'
]
for x, tag in zip(list(mloss[:-1]) + list(results), tags):
tb_writer.add_scalar(tag, x, epoch)
# Update best mAP
fi = fitness(np.array(results).reshape(
1, -1)) # fitness_i = weighted combination of [P, R, mAP, F1]
if fi > best_fitness:
best_fitness = fi
# Save model
save = (not opt.nosave) or (final_epoch and not opt.evolve)
if save:
with open(results_file, 'r') as f: # create checkpoint
ckpt = {
'epoch':
epoch,
'best_fitness':
best_fitness,
'training_results':
f.read(),
'model':
ema.ema.module if hasattr(ema, 'module') else ema.ema,
'optimizer':
None if final_epoch else optimizer.state_dict()
}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
del ckpt
# end epoch ----------------------------------------------------------------------------------------------------
# end training
if rank in [-1, 0]:
# Strip optimizers
n = ('_'
if len(opt.name) and not opt.name.isnumeric() else '') + opt.name
fresults, flast, fbest = 'results%s.txt' % n, wdir + 'last%s.pt' % n, wdir + 'best%s.pt' % n
for f1, f2 in zip([wdir + 'last.pt', wdir + 'best.pt', 'results.txt'],
[flast, fbest, fresults]):
if os.path.exists(f1):
os.rename(f1, f2) # rename
ispt = f2.endswith('.pt') # is *.pt
strip_optimizer(f2) if ispt else None # strip optimizer
os.system('gsutil cp %s gs://%s/weights' % (
f2, opt.bucket)) if opt.bucket and ispt else None # upload
# Finish
if not opt.evolve:
plot_results(save_dir=log_dir) # save as results.png
print('%g epochs completed in %.3f hours.\n' %
(epoch - start_epoch + 1, (time.time() - t0) / 3600))
dist.destroy_process_group() if rank not in [-1, 0] else None
torch.cuda.empty_cache()
return results
def train_model(self, device=None):
if not device:
device = self.device
logging.info("train_model self.device: " + str(device))
self.model.to(device)
args = self.args
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 self.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 self.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 self.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 self.model.named_parameters()
if n not in custom_parameter_names and any(
nd in n for nd in no_decay)
],
"weight_decay":
0.0,
},
])
iteration_in_total = len(
self.train_dl) // args.gradient_accumulation_steps * args.epochs
optimizer, scheduler = self.build_optimizer(self.model,
iteration_in_total)
# warmup_steps = math.ceil(t_total * args.warmup_ratio)
# args.warmup_steps = warmup_steps if args.warmup_steps == 0 else args.warmup_steps
if args.n_gpu > 1:
self.model = torch.nn.DataParallel(self.model)
global_step = 0
training_progress_scores = None
tr_loss, logging_loss = 0.0, 0.0
self.model.zero_grad()
# train_iterator = trange(int(args.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.evaluate_during_training:
training_progress_scores = self._create_training_progress_scores()
if args.fp16:
from torch.cuda import amp
scaler = amp.GradScaler()
if self.args.fl_algorithm == "FedProx":
global_model = copy.deepcopy(self.model)
# for current_epoch in train_iterator:
# model.train()
for epoch in range(0, args.epochs):
self.model.train()
for batch_idx, batch in enumerate(self.train_dl):
# print(batch)
# batch = tuple(t.to(device) for t in batch)
inputs = self._get_inputs_dict(batch)
if args.fp16:
with amp.autocast():
outputs = self.model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
loss = outputs[0]
else:
outputs = self.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
if self.args.fl_algorithm == "FedProx":
fed_prox_reg = 0.0
mu = self.args.fedprox_mu
for (p, g_p) in zip(self.model.parameters(),
global_model.parameters()):
fed_prox_reg += ((mu / 2) * torch.norm(
(p - g_p.data))**2)
loss += fed_prox_reg
current_loss = loss.item()
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()
logging.info(
"epoch = %d, batch_idx = %d/%d, loss = %s" %
(epoch, batch_idx, len(self.train_dl), current_loss))
if (batch_idx + 1) % args.gradient_accumulation_steps == 0:
if args.fp16:
scaler.unscale_(optimizer)
torch.nn.utils.clip_grad_norm_(self.model.parameters(),
args.max_grad_norm)
if args.fp16:
scaler.step(optimizer)
scaler.update()
else:
optimizer.step()
scheduler.step() # Update learning rate schedule
self.model.zero_grad()
global_step += 1
return global_step, tr_loss / global_step
def train(hyp, opt, device, tb_writer=None, wandb=None):
logger.info(f"Hyperparameters {hyp}")
save_dir, epochs, batch_size, total_batch_size, weights, rank = (
Path(opt.save_dir),
opt.epochs,
opt.batch_size,
opt.total_batch_size,
opt.weights,
opt.global_rank,
)
# Directories
wdir = save_dir / "weights"
wdir.mkdir(parents=True, exist_ok=True) # make dir
last = wdir / "last.pt"
best = wdir / "best.pt"
results_file = save_dir / "results.txt"
# Save run settings
with open(save_dir / "hyp.yaml", "w") as f:
yaml.dump(hyp, f, sort_keys=False)
with open(save_dir / "opt.yaml", "w") as f:
yaml.dump(vars(opt), f, sort_keys=False)
# Configure
plots = not opt.evolve # create plots
cuda = device.type != "cpu"
init_seeds(2 + rank)
with open(opt.data) as f:
data_dict = yaml.load(f, Loader=yaml.FullLoader) # data dict
with torch_distributed_zero_first(rank):
check_dataset(data_dict) # check
train_path = data_dict["train"]
test_path = data_dict["val"]
nc, names = (
(1, ["item"]) if opt.single_cls else (int(data_dict["nc"]), data_dict["names"])
) # number classes, names
assert len(names) == nc, "%g names found for nc=%g dataset in %s" % (
len(names),
nc,
opt.data,
) # check
# Model
pretrained = weights.endswith(".pt")
if pretrained:
with torch_distributed_zero_first(rank):
attempt_download(weights) # download if not found locally
ckpt = torch.load(weights, map_location=device) # load checkpoint
if hyp.get("anchors"):
ckpt["model"].yaml["anchors"] = round(hyp["anchors"]) # force autoanchor
model = Model(opt.cfg or ckpt["model"].yaml, ch=3, nc=nc).to(device) # create
exclude = ["anchor"] if opt.cfg or hyp.get("anchors") else [] # exclude keys
state_dict = ckpt["model"].float().state_dict() # to FP32
state_dict = intersect_dicts(
state_dict, model.state_dict(), exclude=exclude
) # intersect
model.load_state_dict(state_dict, strict=False) # load
logger.info(
"Transferred %g/%g items from %s"
% (len(state_dict), len(model.state_dict()), weights)
) # report
else:
model = Model(opt.cfg, ch=3, nc=nc).to(device) # create
# Freeze
freeze = [] # parameter names to freeze (full or partial)
for k, v in model.named_parameters():
v.requires_grad = True # train all layers
if any(x in k for x in freeze):
print("freezing %s" % k)
v.requires_grad = False
# Optimizer
nbs = 64 # nominal batch size
accumulate = max(
round(nbs / total_batch_size), 1
) # accumulate loss before optimizing
hyp["weight_decay"] *= total_batch_size * accumulate / nbs # scale weight_decay
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_modules():
if hasattr(v, "bias") and isinstance(v.bias, nn.Parameter):
pg2.append(v.bias) # biases
if isinstance(v, nn.BatchNorm2d):
pg0.append(v.weight) # no decay
elif hasattr(v, "weight") and isinstance(v.weight, nn.Parameter):
pg1.append(v.weight) # apply decay
if opt.adam:
optimizer = optim.Adam(
pg0, lr=hyp["lr0"], betas=(hyp["momentum"], 0.999)
) # adjust beta1 to momentum
else:
optimizer = optim.SGD(
pg0, lr=hyp["lr0"], momentum=hyp["momentum"], nesterov=True
)
optimizer.add_param_group(
{"params": pg1, "weight_decay": hyp["weight_decay"]}
) # add pg1 with weight_decay
optimizer.add_param_group({"params": pg2}) # add pg2 (biases)
logger.info(
"Optimizer groups: %g .bias, %g conv.weight, %g other"
% (len(pg2), len(pg1), len(pg0))
)
del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
# https://pytorch.org/docs/stable/_modules/torch/optim/lr_scheduler.html#OneCycleLR
lf = (
lambda x: ((1 + math.cos(x * math.pi / epochs)) / 2) * (1 - hyp["lrf"])
+ hyp["lrf"]
) # cosine
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs)
# Logging
if wandb and wandb.run is None:
opt.hyp = hyp # add hyperparameters
wandb_run = wandb.init(
config=opt,
resume="allow",
project="YOLOv5" if opt.project == "runs/train" else Path(opt.project).stem,
name=save_dir.stem,
id=ckpt.get("wandb_id") if "ckpt" in locals() else None,
)
# Resume
start_epoch, best_fitness = 0, 0.0
if pretrained:
# Optimizer
if ckpt["optimizer"] is not None:
optimizer.load_state_dict(ckpt["optimizer"])
best_fitness = ckpt["best_fitness"]
# Results
if ckpt.get("training_results") is not None:
with open(results_file, "w") as file:
file.write(ckpt["training_results"]) # write results.txt
# Epochs
start_epoch = ckpt["epoch"] + 1
if opt.resume:
assert (
start_epoch > 0
), "%s training to %g epochs is finished, nothing to resume." % (
weights,
epochs,
)
if epochs < start_epoch:
logger.info(
"%s has been trained for %g epochs. Fine-tuning for %g additional epochs."
% (weights, ckpt["epoch"], epochs)
)
epochs += ckpt["epoch"] # finetune additional epochs
del ckpt, state_dict
# Image sizes
gs = int(max(model.stride)) # grid size (max stride)
imgsz, imgsz_test = [
check_img_size(x, gs) for x in opt.img_size
] # verify imgsz are gs-multiples
# DP mode
if cuda and rank == -1 and torch.cuda.device_count() > 1:
model = torch.nn.DataParallel(model)
# SyncBatchNorm
if opt.sync_bn and cuda and rank != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
logger.info("Using SyncBatchNorm()")
# EMA
ema = ModelEMA(model) if rank in [-1, 0] else None
# DDP mode
if cuda and rank != -1:
model = DDP(model, device_ids=[opt.local_rank], output_device=opt.local_rank)
# Trainloader
dataloader, dataset = create_dataloader(
train_path,
imgsz,
batch_size,
gs,
opt,
hyp=hyp,
augment=True,
cache=opt.cache_images,
rect=opt.rect,
rank=rank,
world_size=opt.world_size,
workers=opt.workers,
)
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches
assert (
mlc < nc
), "Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g" % (
mlc,
nc,
opt.data,
nc - 1,
)
# Process 0
if rank in [-1, 0]:
ema.updates = start_epoch * nb // accumulate # set EMA updates
testloader = create_dataloader(
test_path,
imgsz_test,
total_batch_size,
gs,
opt,
hyp=hyp,
cache=opt.cache_images and not opt.notest,
rect=True,
rank=-1,
world_size=opt.world_size,
workers=opt.workers,
)[
0
] # testloader
if not opt.resume:
labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1. # frequency
# model._initialize_biases(cf.to(device))
if plots:
plot_labels(labels, save_dir=save_dir)
if tb_writer:
tb_writer.add_histogram("classes", c, 0)
if wandb:
wandb.log(
{
"Labels": [
wandb.Image(str(x), caption=x.name)
for x in save_dir.glob("*labels*.png")
]
}
)
# Anchors
if not opt.noautoanchor:
check_anchors(dataset, model=model, thr=hyp["anchor_t"], imgsz=imgsz)
# Model parameters
hyp["cls"] *= nc / 80.0 # scale coco-tuned hyp['cls'] to current dataset
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.gr = 1.0 # iou loss ratio (obj_loss = 1.0 or iou)
model.class_weights = labels_to_class_weights(dataset.labels, nc).to(
device
) # attach class weights
model.names = names
# Start training
t0 = time.time()
nw = max(
round(hyp["warmup_epochs"] * nb), 1000
) # number of warmup iterations, max(3 epochs, 1k iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
maps = np.zeros(nc) # mAP per class
results = (0, 0, 0, 0, 0, 0, 0) # P, R, [email protected], [email protected], val_loss(box, obj, cls)
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
logger.info(
"Image sizes %g train, %g test\n"
"Using %g dataloader workers\nLogging results to %s\n"
"Starting training for %g epochs..."
% (imgsz, imgsz_test, dataloader.num_workers, save_dir, epochs)
)
for epoch in range(
start_epoch, epochs
): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional)
if opt.image_weights:
# Generate indices
if rank in [-1, 0]:
cw = (
model.class_weights.cpu().numpy() * (1 - maps) ** 2
) # class weights
iw = labels_to_image_weights(
dataset.labels, nc=nc, class_weights=cw
) # image weights
dataset.indices = random.choices(
range(dataset.n), weights=iw, k=dataset.n
) # rand weighted idx
# Broadcast if DDP
if rank != -1:
indices = (
torch.tensor(dataset.indices)
if rank == 0
else torch.zeros(dataset.n)
).int()
dist.broadcast(indices, 0)
if rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(4, device=device) # mean losses
if rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
logger.info(
("\n" + "%10s" * 8)
% ("Epoch", "gpu_mem", "box", "obj", "cls", "total", "targets", "img_size")
)
if rank in [-1, 0]:
pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (
imgs,
targets,
paths,
_,
) in (
pbar
): # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = (
imgs.to(device, non_blocking=True).float() / 255.0
) # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # iou loss ratio (obj_loss = 1.0 or iou)
accumulate = max(
1, np.interp(ni, xi, [1, nbs / total_batch_size]).round()
)
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x["lr"] = np.interp(
ni,
xi,
[
hyp["warmup_bias_lr"] if j == 2 else 0.0,
x["initial_lr"] * lf(epoch),
],
)
if "momentum" in x:
x["momentum"] = np.interp(
ni, xi, [hyp["warmup_momentum"], hyp["momentum"]]
)
# Multi-scale
if opt.multi_scale:
sz = random.randrange(imgsz * 0.5, imgsz * 1.5 + gs) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [
math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]
] # new shape (stretched to gs-multiple)
imgs = F.interpolate(
imgs, size=ns, mode="bilinear", align_corners=False
)
# Forward
with amp.autocast(enabled=cuda):
pred = model(imgs) # forward
loss, loss_items = compute_loss(
pred, targets.to(device), model
) # loss scaled by batch_size
if rank != -1:
loss *= (
opt.world_size
) # gradient averaged between devices in DDP mode
# Backward
scaler.scale(loss).backward()
# Optimize
if ni % accumulate == 0:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema:
ema.update(model)
# Print
if rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses
mem = "%.3gG" % (
torch.cuda.memory_reserved() / 1e9
if torch.cuda.is_available()
else 0
) # (GB)
s = ("%10s" * 2 + "%10.4g" * 6) % (
"%g/%g" % (epoch, epochs - 1),
mem,
*mloss,
targets.shape[0],
imgs.shape[-1],
)
pbar.set_description(s)
# Plot
if plots and ni < 3:
f = save_dir / f"train_batch{ni}.jpg" # filename
plot_images(images=imgs, targets=targets, paths=paths, fname=f)
# if tb_writer:
# tb_writer.add_image(f, result, dataformats='HWC', global_step=epoch)
# tb_writer.add_graph(model, imgs) # add model to tensorboard
elif plots and ni == 3 and wandb:
wandb.log(
{
"Mosaics": [
wandb.Image(str(x), caption=x.name)
for x in save_dir.glob("train*.jpg")
]
}
)
# end batch ------------------------------------------------------------------------------------------------
# end epoch ----------------------------------------------------------------------------------------------------
# Scheduler
lr = [x["lr"] for x in optimizer.param_groups] # for tensorboard
scheduler.step()
# DDP process 0 or single-GPU
if rank in [-1, 0]:
# mAP
if ema:
ema.update_attr(
model, include=["yaml", "nc", "hyp", "gr", "names", "stride"]
)
final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP
results, maps, times = test.test(
opt.data,
batch_size=total_batch_size,
imgsz=imgsz_test,
model=ema.ema,
single_cls=opt.single_cls,
dataloader=testloader,
save_dir=save_dir,
plots=plots and final_epoch,
log_imgs=opt.log_imgs if wandb else 0,
)
# Write
with open(results_file, "a") as f:
f.write(
s + "%10.4g" * 7 % results + "\n"
) # P, R, [email protected], [email protected], val_loss(box, obj, cls)
if len(opt.name) and opt.bucket:
os.system(
"gsutil cp %s gs://%s/results/results%s.txt"
% (results_file, opt.bucket, opt.name)
)
# Log
tags = [
"train/box_loss",
"train/obj_loss",
"train/cls_loss", # train loss
"metrics/precision",
"metrics/recall",
"metrics/mAP_0.5",
"metrics/mAP_0.5:0.95",
"val/box_loss",
"val/obj_loss",
"val/cls_loss", # val loss
"x/lr0",
"x/lr1",
"x/lr2",
] # params
for x, tag in zip(list(mloss[:-1]) + list(results) + lr, tags):
if tb_writer:
tb_writer.add_scalar(tag, x, epoch) # tensorboard
if wandb:
wandb.log({tag: x}) # W&B
# Update best mAP
fi = fitness(
np.array(results).reshape(1, -1)
) # weighted combination of [P, R, [email protected], [email protected]]
if fi > best_fitness:
best_fitness = fi
# Save model
save = (not opt.nosave) or (final_epoch and not opt.evolve)
if save:
with open(results_file, "r") as f: # create checkpoint
ckpt = {
"epoch": epoch,
"best_fitness": best_fitness,
"training_results": f.read(),
"model": ema.ema,
"optimizer": None if final_epoch else optimizer.state_dict(),
"wandb_id": wandb_run.id if wandb else None,
}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
del ckpt
# end epoch ----------------------------------------------------------------------------------------------------
# end training
if rank in [-1, 0]:
# Strip optimizers
n = opt.name if opt.name.isnumeric() else ""
fresults, flast, fbest = (
save_dir / f"results{n}.txt",
wdir / f"last{n}.pt",
wdir / f"best{n}.pt",
)
for f1, f2 in zip(
[wdir / "last.pt", wdir / "best.pt", results_file], [flast, fbest, fresults]
):
if f1.exists():
os.rename(f1, f2) # rename
if str(f2).endswith(".pt"): # is *.pt
strip_optimizer(f2) # strip optimizer
os.system(
"gsutil cp %s gs://%s/weights" % (f2, opt.bucket)
) if opt.bucket else None # upload
# Finish
if plots:
plot_results(save_dir=save_dir) # save as results.png
if wandb:
files = [
"results.png",
"precision_recall_curve.png",
"confusion_matrix.png",
]
wandb.log(
{
"Results": [
wandb.Image(str(save_dir / f), caption=f)
for f in files
if (save_dir / f).exists()
]
}
)
logger.info(
"%g epochs completed in %.3f hours.\n"
% (epoch - start_epoch + 1, (time.time() - t0) / 3600)
)
else:
dist.destroy_process_group()
wandb.run.finish() if wandb and wandb.run else None
torch.cuda.empty_cache()
return results
def train(hyp, opt, device, tb_writer=None):
logger.info(f'Hyperparameters {hyp}')
log_dir = Path(tb_writer.log_dir) if tb_writer else Path(
opt.logdir) / 'evolve' # logging directory
wdir = str(log_dir / 'weights') + os.sep # weights directory
os.makedirs(wdir, exist_ok=True)
last = wdir + 'last.pt'
best = wdir + 'best.pt'
results_file = str(log_dir / 'results.txt')
epochs, batch_size, total_batch_size, weights, rank = \
opt.epochs, opt.batch_size, opt.total_batch_size, opt.weights, opt.global_rank
# Configure
cuda = device.type != 'cpu'
init_seeds(2 + rank)
f = open(opt.data)
data_config = json.load(f)
trainset_paths = data_config['train']
test_paths = data_config['test']
dataset_root = data_config['root']
f.close()
nc, names = (1, ['person'])
# TODO: Use DDP logging. Only the first process is allowed to log.
# Save run settings
with open(log_dir / 'hyp.yaml', 'w') as f:
yaml.dump(hyp, f, sort_keys=False)
with open(log_dir / 'opt.yaml', 'w') as f:
yaml.dump(vars(opt), f, sort_keys=False)
# Model
pretrained = weights.endswith('.pt')
if pretrained:
with torch_distributed_zero_first(rank):
attempt_download(weights) # download if not found locally
ckpt = torch.load(weights, map_location=device) # load checkpoint
model = Model(opt.cfg or ckpt['model'].yaml, ch=3,
nc=nc).to(device) # create
exclude = ['anchor'] if opt.cfg else [] # exclude keys
if type(ckpt['model']).__name__ == "OrderedDict":
state_dict = ckpt['model']
else:
state_dict = ckpt['model'].float().state_dict() # to FP32
state_dict = intersect_dicts(state_dict,
model.state_dict(),
exclude=exclude) # intersect
model.load_state_dict(state_dict, strict=False) # load
logger.info(
'Transferred %g/%g items from %s' %
(len(state_dict), len(model.state_dict()), weights)) # report
else:
model = Model(opt.cfg, ch=3, nc=nc).to(device) # create
# Freeze
freeze = [
'',
] # parameter names to freeze (full or partial)
if any(freeze):
for k, v in model.named_parameters():
if any(x in k for x in freeze):
print('freezing %s' % k)
v.requires_grad = False
# Image sizes
gs = int(max(model.stride)) # grid size (max stride)
#imgsz, imgsz_test = [check_img_size(x, gs) for x in opt.img_size] # verify imgsz are gs-multiples
imgsz = opt.img_size
# Trainloader
dataloader, dataset = create_dataloader(dataset_root,
trainset_paths,
imgsz,
batch_size,
gs,
opt,
hyp=hyp,
augment=True,
cache=opt.cache_images,
rect=False,
rank=rank,
world_size=opt.world_size,
workers=opt.workers,
state="train")
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches
#assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (mlc, nc, opt.data, nc - 1)
# Testloader
if rank in [-1, 0]:
# local_rank is set to -1. Because only the first process is expected to do evaluation.
testloader = cstrack.create_dataloader(dataset_root,
test_paths,
imgsz,
total_batch_size,
gs,
opt,
hyp=hyp,
augment=False,
cache=opt.cache_images,
rect=True,
rank=-1,
world_size=opt.world_size,
workers=opt.workers,
state="test")[0]
#MOT_loss
mot_loss = MotLoss(dataset.nID, opt.emb_dim)
# Optimizer
nbs = 64 # nominal batch size
accumulate = max(round(nbs / total_batch_size),
1) # accumulate loss before optimizing
hyp['weight_decay'] *= total_batch_size * accumulate / nbs # scale weight_decay
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_parameters():
v.requires_grad = True
if '.bias' in k:
pg2.append(v) # biases
elif '.weight' in k and '.bn' not in k:
pg1.append(v) # apply weight decay
else:
pg0.append(v) # all else
if opt.adam:
base_optimizer = optim.Adam(pg0,
lr=hyp['lr0'],
betas=(hyp['momentum'],
0.999)) # adjust beta1 to momentum
optimizer = Lookahead(optimizer=base_optimizer, k=5, alpha=0.5)
else:
optimizer = optim.SGD(pg0,
lr=hyp['lr0'],
momentum=hyp['momentum'],
nesterov=True)
optimizer.add_param_group({
'params': pg1,
'weight_decay': hyp['weight_decay']
}) # add pg1 with weight_decay
optimizer.add_param_group({'params': pg2}) # add pg2 (biases)
optimizer.add_param_group({'params': mot_loss.parameters()})
logger.info('Optimizer groups: %g .bias, %g conv.weight, %g other' %
(len(pg2), len(pg1), len(pg0)))
del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
# https://pytorch.org/docs/stable/_modules/torch/optim/lr_scheduler.html#OneCycleLR
lf = lambda x: ((
(1 + math.cos(x * math.pi / epochs)) / 2)**1.0) * 0.9 + 0.1 # cosine
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs)
# Resume
start_epoch, best_fitness = 0, 0.0
if pretrained:
# Optimizer
if ckpt['optimizer'] is not None:
optimizer.load_state_dict(ckpt['optimizer'])
best_fitness = ckpt['best_fitness']
# Results
if ckpt.get('training_results') is not None:
with open(results_file, 'w') as file:
file.write(ckpt['training_results']) # write results.txt
# Epochs
start_epoch = ckpt['epoch'] + 1
if epochs < start_epoch:
logger.info(
'%s has been trained for %g epochs. Fine-tuning for %g additional epochs.'
% (weights, ckpt['epoch'], epochs))
epochs += ckpt['epoch'] # finetune additional epochs
del ckpt, state_dict
start_epoch = opt.start_epoch
# DP mode
if cuda and rank == -1 and torch.cuda.device_count() > 1:
model = torch.nn.DataParallel(model)
# SyncBatchNorm
if opt.sync_bn and cuda and rank != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
logger.info('Using SyncBatchNorm()')
# Exponential moving average
ema = ModelEMA(model) if rank in [-1, 0] else None
# DDP mode
if cuda and rank != -1:
model = DDP(model,
device_ids=[opt.local_rank],
output_device=(opt.local_rank))
# Model parameters
hyp['cls'] *= nc / 80. # scale coco-tuned hyp['cls'] to current dataset
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.gr = 1.0 # giou loss ratio (obj_loss = 1.0 or giou)
model.class_weights = labels_to_class_weights(dataset.labels, nc).to(
device) # attach class weights
model.names = names
# Class frequency
if rank in [-1, 0]:
labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1.
# model._initialize_biases(cf.to(device))
#plot_labels(labels, save_dir=log_dir)
if tb_writer:
# tb_writer.add_hparams(hyp, {}) # causes duplicate https://github.com/ultralytics/yolov5/pull/384
tb_writer.add_histogram('classes', c, 0)
# Check anchors
#if not opt.noautoanchor:
# check_anchors(dataset, model=model, thr=hyp['anchor_t'], imgsz=imgsz)
# Start training
t0 = time.time()
nw = max(3 * nb,
1e3) # number of warmup iterations, max(3 epochs, 1k iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
maps = np.zeros(nc) # mAP per class
results = (
0, 0, 0, 0, 0, 0, 0
) # 'P', 'R', 'mAP', 'F1', 'val GIoU', 'val Objectness', 'val Classification'
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
logger.info('Image sizes (%g , %g)' % (imgsz[0], imgsz[1]))
logger.info('Using %g dataloader workers' % dataloader.num_workers)
logger.info('Starting training for %g epochs...' % epochs)
# torch.autograd.set_detect_anomaly(True)
for epoch in range(
start_epoch, epochs
): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional)
if dataset.image_weights:
# Generate indices
if rank in [-1, 0]:
w = model.class_weights.cpu().numpy() * (
1 - maps)**2 # class weights
image_weights = labels_to_image_weights(dataset.labels,
nc=nc,
class_weights=w)
dataset.indices = random.choices(
range(dataset.n), weights=image_weights,
k=dataset.n) # rand weighted idx
# Broadcast if DDP
if rank != -1:
indices = torch.zeros([dataset.n], dtype=torch.int)
if rank == 0:
indices[:] = torch.from_tensor(dataset.indices,
dtype=torch.int)
dist.broadcast(indices, 0)
if rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(5, device=device) # mean losses
if rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
logger.info(
('\n' + '%10s' * 9) % ('Epoch', 'gpu_mem', 'GIoU', 'idloss',
'dmloss', 'obj', 'total', 'targets', 'lr'))
if rank in [-1, 0]:
pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (
imgs, targets, paths, _, dense_mask
) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float(
) / 255.0 # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # giou loss ratio (obj_loss = 1.0 or giou)
accumulate = max(
1,
np.interp(ni, xi, [1, nbs / total_batch_size]).round())
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
if opt.fineturn:
x['lr'] = np.interp(ni, xi, [
0.1 if j == 2 else 0.0,
x['initial_lr'] * lf(epoch) * 0.1
])
else:
x['lr'] = np.interp(ni, xi, [
0.1 if j == 2 else 0.0, x['initial_lr'] * lf(epoch)
])
if 'momentum' in x:
x['momentum'] = np.interp(ni, xi,
[0.9, hyp['momentum']])
for j, x in enumerate(optimizer.param_groups):
if ni > nw and ni <= 20 * nb:
if opt.fineturn:
x['lr'] = x['initial_lr'] * 0.1
else:
x['lr'] = x['initial_lr']
if ni > 20 * nb and ni <= 40 * nb:
x['lr'] = x['initial_lr'] * 0.1
if ni > 40 * nb:
x['lr'] = x['initial_lr'] * 0.1
lr_now = x['lr']
# Multi-scale
if opt.multi_scale and ni > nw and epoch % 2 == 0:
sz = random.randrange(imgsz[0] * 0.5,
imgsz[0] * 1.0) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]
] # new shape (stretched to gs-multiple)
imgs = F.interpolate(imgs,
size=ns,
mode='bilinear',
align_corners=False)
# Autocast
with amp.autocast(enabled=cuda):
# Forward
pred = model(imgs)
# Loss
loss, loss_items = mot_loss(pred, targets.to(device),
dense_mask.to(device),
model) # scaled by batch_size
if rank != -1:
loss *= opt.world_size # gradient averaged between devices in DDP mode
# if not torch.isfinite(loss):
# logger.info('WARNING: non-finite loss, ending training ', loss_items)
# return results
# Backward
scaler.scale(loss).backward()
# Optimize
if ni % accumulate == 0:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema is not None:
ema.update(model)
# Print
if rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1
) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_reserved() / 1E9
if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.4g' * 7) % (
'%g/%g' %
(epoch, epochs - 1), mem, *mloss, targets.shape[0], lr_now)
pbar.set_description(s)
# Plot
if ni < 3:
f = str(log_dir / ('train_batch%g.jpg' % ni)) # filename
result = plot_images(images=imgs,
targets=targets,
paths=paths,
fname=f)
if tb_writer and result is not None:
tb_writer.add_image(f,
result,
dataformats='HWC',
global_step=epoch)
# tb_writer.add_graph(model, imgs) # add model to tensorboard
# end batch ------------------------------------------------------------------------------------------------
# Scheduler
scheduler.step()
# DDP process 0 or single-GPU
if rank in [-1, 0]:
# mAP
if ema is not None:
ema.update_attr(
model,
include=['yaml', 'nc', 'hyp', 'gr', 'names', 'stride'])
final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP
results, maps, times = eval.test(
opt.data,
batch_size=total_batch_size,
imgsz=imgsz,
model=ema.ema.module
if hasattr(ema.ema, 'module') else ema.ema,
single_cls=opt.single_cls,
dataloader=testloader,
save_dir=log_dir)
# Write
with open(results_file, 'a') as f:
f.write(s + '%10.4g' * 4 % results +
'\n') # P, R, mAP, F1, test_losses=(GIoU, obj, cls)
if len(opt.name) and opt.bucket:
os.system('gsutil cp %s gs://%s/results/results%s.txt' %
(results_file, opt.bucket, opt.name))
# Tensorboard
if tb_writer:
tags = [
'train/giou_loss', 'train/obj_loss', 'train/cls_loss',
'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5',
'metrics/mAP_0.5:0.95', 'val/giou_loss', 'val/obj_loss',
'val/cls_loss'
]
for x, tag in zip(list(mloss[:-1]) + list(results), tags):
tb_writer.add_scalar(tag, x, epoch)
# Update best mAP
fi = fitness(np.array(results).reshape(
1, -1)) # fitness_i = weighted combination of [P, R, mAP, F1]
if fi > best_fitness:
best_fitness = fi
# Save model
save = (not opt.nosave) or (final_epoch and not opt.evolve)
if save:
with open(results_file, 'r') as f: # create checkpoint
ckpt = {
'epoch':
epoch,
'best_fitness':
best_fitness,
'training_results':
f.read(),
'model':
ema.ema.module if hasattr(ema, 'module') else ema.ema,
'optimizer':
None if final_epoch else optimizer.state_dict()
}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
del ckpt
# end epoch ----------------------------------------------------------------------------------------------------
# end training
if rank in [-1, 0]:
# Strip optimizers
n = ('_'
if len(opt.name) and not opt.name.isnumeric() else '') + opt.name
fresults, flast, fbest = 'results%s.txt' % n, wdir + 'last%s.pt' % n, wdir + 'best%s.pt' % n
for f1, f2 in zip([wdir + 'last.pt', wdir + 'best.pt', 'results.txt'],
[flast, fbest, fresults]):
if os.path.exists(f1):
os.rename(f1, f2) # rename
ispt = f2.endswith('.pt') # is *.pt
strip_optimizer(f2) if ispt else None # strip optimizer
os.system('gsutil cp %s gs://%s/weights' % (
f2, opt.bucket)) if opt.bucket and ispt else None # upload
# Finish
#if not opt.evolve:
#plot_results(save_dir=log_dir) # save as results.png
logger.info('%g epochs completed in %.3f hours.\n' %
(epoch - start_epoch + 1, (time.time() - t0) / 3600))
dist.destroy_process_group() if rank not in [-1, 0] else None
torch.cuda.empty_cache()
return results
def train_sanity_fit(
model: nn.Module,
train_loader,
device: str,
num_batches: int = None,
log_interval: int = 100,
fp16: bool = False,
):
"""
Performs Sanity fit over train loader.
Use this to dummy check your train_step function. It does not calculate metrics, timing, or does checkpointing.
It iterates over both train_loader for given batches.
Note: - It does not to loss.backward().
Args:
model : A pytorch Faster RCNN Model.
train_loader : Train loader.
device : "cuda" or "cpu"
num_batches : (optional) Integer To limit sanity fit over certain batches.
Useful is data is too big even for sanity check.
log_interval : (optional) Defualt 100. Integer to Log after specified batch ids in every batch.
fp16: : (optional) If True uses PyTorch native mixed precision Training.
"""
model = model.to(device)
model.train()
cnt = 0
last_idx = len(train_loader) - 1
train_sanity_start = time.time()
if fp16 is True:
scaler = amp.GradScaler()
for batch_idx, (inputs, targets) in enumerate(train_loader):
last_batch = batch_idx == last_idx
images = list(image.to(device) for image in inputs)
targets = [{k: v.to(device) for k, v in t.items()} for t in targets]
if fp16 is True:
with amp.autocast():
loss_dict = model(images, targets)
else:
loss_dict = model(images, targets)
cnt += 1
if last_batch or batch_idx % log_interval == 0:
print(
f"Train sanity check passed for batch till {batch_idx} batches"
)
if num_batches is not None:
if cnt >= num_batches:
print(f"Done till {num_batches} train batches")
print("All specified batches done")
train_sanity_end = time.time()
print(
f"Train sanity fit check passed in time {train_sanity_end-train_sanity_start}"
)
return True
train_sanity_end = time.time()
print("All specified batches done")
print(
f"Train sanity fit check passed in time {train_sanity_end-train_sanity_start}"
)
return True
def run(self):
## init distributed
self.cfg = init_distributed(self.cfg)
cfg = self.cfg
# cfg.print()
## parser_dict
self.dictionary = self._parser_dict()
## parser_datasets
datasets, dataloaders, data_samplers, dataset_sizes = self._parser_datasets(
)
## parser_model
model_ft = self._parser_model()
# Scale learning rate based on global batch size
if cfg.SCALE_LR.ENABLED:
cfg.INIT_LR = cfg.INIT_LR * float(
self.batch_size) / cfg.SCALE_LR.VAL
scaler = amp.GradScaler(enabled=True)
if cfg.WARMUP.NAME is not None:
logger.info('Start warm-up ... ')
self.warm_up(scaler, model_ft, dataloaders['train'], cfg)
logger.info('finish warm-up!')
## parser_optimizer
optimizer_ft = build_optimizer(cfg, model_ft)
## parser_lr_scheduler
lr_scheduler_ft = build_lr_scheduler(cfg, optimizer_ft)
if cfg.distributed:
model_ft = DDP(model_ft,
device_ids=[cfg.local_rank],
output_device=(cfg.local_rank))
# Freeze
freeze_models(model_ft)
if self.cfg.PRETRAIN_MODEL is not None:
if self.cfg.RESUME:
self.start_epoch = self.ckpts.resume_checkpoint(
model_ft, optimizer_ft)
else:
self.start_epoch = self.ckpts.load_checkpoint(
self.cfg.PRETRAIN_MODEL, model_ft, optimizer_ft)
## vis network graph
if self.cfg.TENSORBOARD_MODEL and False:
self.tb_writer.add_graph(model_ft, (model_ft.dummy_input.cuda(), ))
self.steps_per_epoch = int(dataset_sizes['train'] // self.batch_size)
best_acc = 0.0
best_perf_rst = None
for epoch in range(self.start_epoch + 1, self.cfg.N_MAX_EPOCHS):
if cfg.distributed:
dataloaders['train'].sampler.set_epoch(epoch)
self.train_epoch(scaler, epoch, model_ft, datasets['train'],
dataloaders['train'], optimizer_ft)
lr_scheduler_ft.step()
if self.cfg.DATASET.VAL and (
not epoch % cfg.EVALUATOR.EVAL_INTERVALS
or epoch == self.cfg.N_MAX_EPOCHS - 1):
acc, perf_rst = self.val_epoch(epoch, model_ft,
datasets['val'],
dataloaders['val'])
if cfg.local_rank == 0:
# start to save best performance model after learning rate decay to 1e-6
if best_acc < acc:
self.ckpts.autosave_checkpoint(model_ft, epoch, 'best',
optimizer_ft)
best_acc = acc
best_perf_rst = perf_rst
# continue
if not epoch % cfg.N_EPOCHS_TO_SAVE_MODEL:
if cfg.local_rank == 0:
self.ckpts.autosave_checkpoint(model_ft, epoch, 'last',
optimizer_ft)
if best_perf_rst is not None:
logger.info(best_perf_rst.replace("(val)", "(best)"))
if cfg.local_rank == 0:
self.tb_writer.close()
dist.destroy_process_group() if cfg.local_rank != 0 else None
torch.cuda.empty_cache()
def __init__(
self,
model: Model,
optimizer: torch.optim.Optimizer,
data_loader: DataLoader,
patience: Optional[int] = None,
validation_metric: str = "-loss",
validation_data_loader: DataLoader = None,
num_epochs: int = 20,
serialization_dir: Optional[str] = None,
checkpointer: Checkpointer = None,
cuda_device: Optional[Union[int, torch.device]] = None,
grad_norm: Optional[float] = None,
grad_clipping: Optional[float] = None,
learning_rate_scheduler: Optional[LearningRateScheduler] = None,
momentum_scheduler: Optional[MomentumScheduler] = None,
tensorboard_writer: TensorboardWriter = None,
moving_average: Optional[MovingAverage] = None,
batch_callbacks: List[BatchCallback] = None,
epoch_callbacks: List[EpochCallback] = None,
distributed: bool = False,
local_rank: int = 0,
world_size: int = 1,
num_gradient_accumulation_steps: int = 1,
use_amp: bool = False,
) -> None:
super().__init__(serialization_dir, cuda_device, distributed, local_rank, world_size)
# I am not calling move_to_gpu here, because if the model is
# not already on the GPU then the optimizer is going to be wrong.
self.model = model
self.data_loader = data_loader
self._validation_data_loader = validation_data_loader
self.optimizer = optimizer
if patience is None: # no early stopping
if validation_data_loader is not None:
logger.warning(
"You provided a validation dataset but patience was set to None, "
"meaning that early stopping is disabled"
)
elif (not isinstance(patience, int)) or patience <= 0:
raise ConfigurationError(
'{} is an invalid value for "patience": it must be a positive integer '
"or None (if you want to disable early stopping)".format(patience)
)
# For tracking is_best_so_far and should_stop_early
self._metric_tracker = MetricTracker(patience, validation_metric)
# Get rid of + or -
self._validation_metric = validation_metric[1:]
self._num_epochs = num_epochs
if checkpointer is not None:
self._checkpointer = checkpointer
else:
self._checkpointer = Checkpointer(serialization_dir)
self._grad_norm = grad_norm
self._grad_clipping = grad_clipping
self._learning_rate_scheduler = learning_rate_scheduler
self._momentum_scheduler = momentum_scheduler
self._moving_average = moving_average
self._batch_callbacks = batch_callbacks or []
self._epoch_callbacks = epoch_callbacks or []
# We keep the total batch number as an instance variable because it
# is used inside a closure for the hook which logs activations in
# `_enable_activation_logging`.
self._batch_num_total = 0
self._tensorboard = tensorboard_writer or TensorboardWriter(serialization_dir)
self._tensorboard.get_batch_num_total = lambda: self._batch_num_total
self._tensorboard.enable_activation_logging(self.model)
self._last_log = 0.0 # time of last logging
self._num_gradient_accumulation_steps = num_gradient_accumulation_steps
# Enable automatic mixed precision training.
self._scaler: Optional[amp.GradScaler] = None
self._use_amp = use_amp
if self._use_amp:
if self.cuda_device == torch.device("cpu"):
raise ValueError("Using AMP requires a cuda device")
self._scaler = amp.GradScaler()
# Using `DistributedDataParallel`(ddp) brings in a quirk wrt AllenNLP's `Model` interface and its
# usage. A `Model` object is wrapped by `ddp`, but assigning the wrapped model to `self.model`
# will break the usages such as `Model.get_regularization_penalty`, `Model.get_metrics`, etc.
#
# Hence a reference to Pytorch's object is maintained in the case of distributed training and in the
# normal case, reference to `Model` is retained. This reference is only used in
# these places: `model.__call__`, `model.train` and `model.eval`.
if self._distributed:
self._pytorch_model = DistributedDataParallel(
self.model,
device_ids=None if self.cuda_device == torch.device("cpu") else [self.cuda_device],
find_unused_parameters=True,
)
else:
self._pytorch_model = self.model
batch_size=128 * 50,
shuffle=True)
test_loader = Data.DataLoader(dataset=test_data,
batch_size=128 * 50,
shuffle=False)
train_batch_num = len(train_loader)
test_batch_num = len(test_loader)
net = Network()
if torch.cuda.is_available():
# net = nn.DataParallel(net)
net.cuda()
# +++++++++++++++++++++++++++++++
scaler = amp.GradScaler()
# +++++++++++++++++++++++++++++++
opt = torch.optim.Adam(net.parameters(), lr=0.001)
loss_func = nn.CrossEntropyLoss()
for epoch_index in range(10):
st = time.time()
torch.set_grad_enabled(True)
net.train()
for train_batch_index, (img_batch, label_batch) in enumerate(train_loader):
if torch.cuda.is_available():
img_batch = img_batch.cuda()
label_batch = label_batch.cuda()
dataloader = torch.utils.data.DataLoader(
dataset,
batch_size=opt.batch_size,
shuffle=True,
num_workers=opt.n_cpu,
pin_memory=True,
# pin_memory就是锁页内存，pin_memory=True，则意味着生成的Tensor数据最开始是属于内存中的锁页内存，
# 这样将内存的Tensor转义到GPU的显存就会更快一些。
collate_fn=dataset.collate_fn, # 如何取样本的，我们可以定义自己的函数来准确地实现想要的功能
)
optimizer = torch.optim.Adam(filter(lambda p: p.requires_grad, model.parameters()), lr=lr) # Adam优化器
scheduler = lr_scheduler.StepLR(optimizer, step_size=50, gamma=0.95)
scheduler.last_epoch = opt.start_epoch - 1
scaler = amp.GradScaler(enabled=True)
Loss = YOLOLoss_total(opt.model_def)
metrics = [
"grid_size",
"loss",
"x",
"y",
"w",
"h",
"conf",
"cls",
"cls_acc",
"recall50",
"recall75",
def train(self, train_dataset, output_dir, show_running_loss=True, eval_df=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(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["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["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["epochs"]), desc="Epoch", disable=args["silent"])
if args["fp16"]:
from torch.cuda import amp
scaler = amp.GradScaler()
for _ in train_iterator:
model.train()
# epoch_iterator = tqdm(train_dataloader, desc="Iteration")
for step, batch in enumerate(tqdm(train_dataloader, desc=f"Running Training", disable=args["silent"])):
batch = tuple(t.to(self.device) for t in batch)
inputs = self._get_inputs_dict(batch)
if args["fp16"]:
with amp.autocast():
if self.sliding_window:
outputs = model(inputs)
else:
outputs = model(**inputs)
# model outputs are always tuple in pytorch-transformers (see doc)
else:
if self.sliding_window:
outputs = model(inputs)
else:
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"]:
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
if args["evaluate_during_training"]:
# Only evaluate when single GPU otherwise metrics may not average well
results, _, _ = self.eval_model(eval_df, 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_last_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))
os.makedirs(output_dir_current, exist_ok=True)
# 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 if not self.args.evaluate_during_training else training_progress_scores,
)
def run(gpu_id, options, distributed=False):
if distributed:
dist.init_process_group(
backend="nccl",
rank=gpu_id,
world_size=options.num_gpus,
init_method="env://",
)
torch.cuda.set_device(gpu_id)
torch.manual_seed(options.seed)
use_cuda = torch.cuda.is_available() and not options.no_cuda
device = torch.device("cuda" if use_cuda else "cpu")
logger = lavd.Logger(options.name, disabled=gpu_id != 0)
# Parser needs to be rebuilt, since it can't be serialised and it is needed to even
# detect the number of GPUs, but here it's only used to log it.
parser = build_parser() if gpu_id == 0 else None
spinner = logger.spinner("Initialising")
spinner.start()
checkpoint = (default_checkpoint
if options.checkpoint is None else load_checkpoint(
os.path.join(options.checkpoint, "stats.pt")))
# Either use the checkpoint directory as the configuration or use one of the
# available pre-trained models.
pre_trained = options.checkpoint or options.pre_trained
# All but the primary GPU wait here, so that only the primary process loads the
# pre-trained model and the rest uses the cached version.
if distributed and gpu_id != 0:
torch.distributed.barrier()
model_kind = checkpoint["model"].get("kind") or options.model_kind
use_special = True
masked_lm = True
if model_kind == "bert":
if pre_trained is None:
pre_trained = "bert-base-german-cased"
config = BertConfig.from_pretrained(pre_trained)
model = BertForMaskedLM.from_pretrained(pre_trained, config=config)
tokeniser = BertTokenizer.from_pretrained(pre_trained)
elif model_kind == "bert-scratch":
# The pre_trained here is only for the configuartion (num layers etc.)
# But the weights are not loaded
if pre_trained is None:
pre_trained = "bert-base-german-cased"
# Use either the provided vocabulary or the pre_trained one.
vocab = options.vocab or pre_trained
tokeniser = BertTokenizer.from_pretrained(vocab)
config = BertConfig.from_pretrained(pre_trained)
config.vocab_size = tokeniser.vocab_size
model = BertForMaskedLM(config)
elif model_kind == "gpt2":
if pre_trained is None:
pre_trained = "gpt2"
config = GPT2Config.from_pretrained(pre_trained)
model = GPT2LMHeadModel.from_pretrained(pre_trained, config=config)
tokeniser = GPT2Tokenizer.from_pretrained(pre_trained)
masked_lm = False
use_special = False
elif model_kind == "gpt2-german":
assert pre_trained is not None, "--pre-trained must be given for gpt2-german"
config = GPT2Config.from_pretrained(pre_trained)
model = GPT2LMHeadModel.from_pretrained(pre_trained, config=config)
# Using the XLNetTokenizer because the pre-trained German GPT-2 model uses
# SentencePiece and that's easiest way to use it.
# That also means that the automatic tokenisation cannot be done, because XLNet
# uses different placing of the special tokens.
tokeniser = XLNetTokenizer.from_pretrained(
pre_trained,
keep_accents=True,
unk_token="<unk>",
# start and end of sequence use the same token
bos_token="<endoftext>",
eos_token="<endoftext>",
)
masked_lm = False
use_special = False
elif model_kind == "gpt2-scratch":
# The pre_trained here is only for the configuartion (num layers etc.)
# But the weights are not loaded
if pre_trained is None:
pre_trained = "gpt2"
# Use either the provided vocabulary or the pre_trained one.
vocab = options.vocab or pre_trained
tokeniser = GPT2Tokenizer.from_pretrained(vocab)
config = GPT2Config.from_pretrained(pre_trained)
config.vocab_size = tokeniser.vocab_size
model = GPT2LMHeadModel(config)
masked_lm = False
use_special = False
else:
raise Exception("No model available for {}".format(model_kind))
model = model.to(device)
# Primary process has loaded the model and the other can now load the cached
# version.
if distributed and gpu_id == 0:
torch.distributed.barrier()
train_dataset = TextDataset(
options.train_text,
tokeniser,
use_special=use_special,
manual_special=model_kind == "gpt2-german",
)
train_sampler = (DistributedSampler(train_dataset,
num_replicas=options.num_gpus,
rank=gpu_id) if distributed else None)
train_data_loader = DataLoader(
train_dataset,
batch_size=options.batch_size,
# Only shuffle when not using a sampler
shuffle=train_sampler is None,
num_workers=options.actual_num_workers,
sampler=train_sampler,
pin_memory=True,
)
validation_data_loaders = []
for val_file in options.validation_text:
vals = val_file.split("=", 1)
if len(vals) > 1:
# Remove whitespace around the name
name = vals[0].strip()
# Expand the ~ to the full path as it won't be done automatically since it's
# not at the beginning of the word.
file_path = os.path.expanduser(vals[1])
else:
name = None
file_path = vals[0]
validation_dataset = TextDataset(
file_path,
tokeniser,
name=name,
use_special=use_special,
manual_special=model_kind == "gpt2-german",
)
validation_sampler = (DistributedSampler(
validation_dataset, num_replicas=options.num_gpus, rank=gpu_id)
if distributed else None)
validation_data_loader = DataLoader(
validation_dataset,
batch_size=options.batch_size,
# Only shuffle when not using a sampler
shuffle=validation_sampler is None,
num_workers=options.actual_num_workers,
sampler=validation_sampler,
pin_memory=True,
)
validation_data_loaders.append(validation_data_loader)
initial_lr = options.lr
# Only restore the learning rate if resuming from a checkpoint and not manually
# resetting the learning rate.
if len(checkpoint["train"]["lr"]) > 0 and not options.reset_lr:
initial_lr = checkpoint["train"]["lr"][-1]
no_decay = ["bias", "LayerNorm.weight"]
optimiser_grouped_parameters = [
{
"params": [
param for name, param in model.named_parameters()
if not any(nd in name for nd in no_decay)
],
"weight_decay":
options.weight_decay,
},
{
"params": [
param for name, param in model.named_parameters()
if any(nd in name for nd in no_decay)
],
"weight_decay":
0.0,
},
]
optimiser = AdamW(optimiser_grouped_parameters,
lr=initial_lr,
eps=options.adam_eps)
lr_scheduler = get_linear_schedule_with_warmup(
optimiser,
num_warmup_steps=options.lr_warmup,
num_training_steps=options.num_epochs,
)
amp_scaler = amp.GradScaler() if use_cuda and options.fp16 else None
if distributed:
model = DistributedDataParallel(model,
device_ids=[gpu_id],
find_unused_parameters=True)
validation_details = [
OrderedDict(
name=data_loader.dataset.name,
path=data_loader.dataset.path,
size=len(data_loader.dataset),
) for data_loader in validation_data_loaders
]
experiment = OrderedDict(
model_kind=model_kind,
train=OrderedDict(path=train_dataset.path, size=len(train_dataset)),
validation=validation_details,
options=options,
)
log_experiment(logger, experiment)
logger.log_command(parser, options)
# Wait for all processes to load eveything before starting training.
# Not strictly necessary, since they will wait once the actual model is run, but
# this makes it nicer to show the spinner until all of them are ready.
if distributed:
torch.distributed.barrier()
spinner.stop()
if options.checkpoint is not None:
resume_text = "Resuming from - Epoch {epoch}".format(
epoch=checkpoint["epoch"])
logger.set_prefix(resume_text)
epoch_results = [
OrderedDict(
name="Train",
stats=OrderedDict(
loss=checkpoint["train"]["stats"]["loss"][-1],
perplexity=checkpoint["train"]["stats"]["perplexity"][-1],
),
)
] + [
OrderedDict(
name=val_name,
stats=OrderedDict(
loss=val_result["stats"]["loss"][-1],
perplexity=val_result["stats"]["perplexity"][-1],
),
) for val_name, val_result in checkpoint["validation"].items()
]
log_epoch_stats(logger, epoch_results, metrics)
train(
logger,
model,
optimiser,
train_data_loader,
validation_data_loaders,
lr_scheduler=lr_scheduler,
device=device,
num_epochs=options.num_epochs,
checkpoint=checkpoint,
model_kind=model_kind,
amp_scaler=amp_scaler,
masked_lm=masked_lm,
)
def __init__(self, cfg_path):
with open(cfg_path, 'r') as rf:
self.cfg = yaml.safe_load(rf)
self.data_cfg = self.cfg['data']
self.model_cfg = self.cfg['model']
self.optim_cfg = self.cfg['optim']
self.val_cfg = self.cfg['val']
print(self.data_cfg)
print(self.model_cfg)
print(self.optim_cfg)
print(self.val_cfg)
self.tdata = MSCOCO(
img_root=self.data_cfg['train_img_root'],
ann_path=self.data_cfg['train_ann_path'],
debug=self.data_cfg['debug'],
augment=True,
)
self.tloader = DataLoader(dataset=self.tdata,
batch_size=self.data_cfg['batch_size'],
num_workers=self.data_cfg['num_workers'],
collate_fn=self.tdata.collate_fn,
shuffle=True)
self.vdata = MSCOCO(
img_root=self.data_cfg['val_img_root'],
ann_path=self.data_cfg['val_ann_path'],
debug=False,
augment=False,
)
self.vloader = DataLoader(dataset=self.vdata,
batch_size=self.data_cfg['batch_size'],
num_workers=self.data_cfg['num_workers'],
collate_fn=self.vdata.collate_fn,
shuffle=False)
print("train_data: ", len(self.tdata), " | ", "val_data: ",
len(self.vdata))
print("train_iter: ", len(self.tloader), " | ", "val_iter: ",
len(self.vloader))
model: torch.nn.Module = getattr(
eval(self.model_cfg['type']),
self.model_cfg['name'])(pretrained=self.model_cfg['pretrained'],
num_classes=self.model_cfg['num_joints'],
reduction=self.model_cfg['reduction'])
self.scaler = amp.GradScaler(
enabled=True) if self.optim_cfg['amp'] else None
self.optimizer = Adam(model.parameters(), lr=self.optim_cfg['lr'])
self.lr_scheduler = torch.optim.lr_scheduler.MultiStepLR(
self.optimizer,
milestones=self.optim_cfg['milestones'],
gamma=self.optim_cfg['gamma'])
# self.lr_scheduler = IterWarmUpCosineDecayMultiStepLRAdjust(
# init_lr=self.optim_cfg['lr'],
# milestones=self.optim_cfg['milestones'],
# warm_up_epoch=1,
# iter_per_epoch=len(self.tloader),
# epochs=self.optim_cfg['epochs']
# )
assert torch.cuda.is_available(), "training only support cuda"
assert torch.cuda.device_count() >= len(
self.cfg['gpus']), "not have enough gpus"
self.inp_device = torch.device("cuda:{:d}".format(self.cfg['gpus'][0]))
self.out_device = torch.device("cuda:{:d}".format(
self.cfg['gpus'][-1]))
model.to(self.inp_device)
self.model = nn.DataParallel(model,
device_ids=self.cfg['gpus'],
output_device=self.out_device)
# self.ema = ModelEMA(self.model)
self.creterion = nn.MSELoss()
self.acc_func = HeatMapAcc()
self.best_ap = 0.
self.loss_logger = AverageLogger()
self.acc_logger = AverageLogger()
self.decoder = BasicKeyPointDecoder()
def train(hyp, # path/to/hyp.yaml or hyp dictionary
opt,
device,
):
save_dir, epochs, batch_size, total_batch_size, weights, rank, single_cls = \
Path(opt.save_dir), opt.epochs, opt.batch_size, opt.total_batch_size, opt.weights, opt.global_rank, \
opt.single_cls
# Directories
wdir = save_dir / 'weights'
wdir.mkdir(parents=True, exist_ok=True) # make dir
last = wdir / 'last.pt'
best = wdir / 'best.pt'
results_file = save_dir / 'results.txt'
# Hyperparameters
if isinstance(hyp, str):
with open(hyp) as f:
hyp = yaml.safe_load(f) # load hyps dict
logger.info(colorstr('hyperparameters: ') + ', '.join(f'{k}={v}' for k, v in hyp.items()))
# Save run settings
with open(save_dir / 'hyp.yaml', 'w') as f:
yaml.safe_dump(hyp, f, sort_keys=False)
with open(save_dir / 'opt.yaml', 'w') as f:
yaml.safe_dump(vars(opt), f, sort_keys=False)
# Configure
plots = not opt.evolve # create plots
cuda = device.type != 'cpu'
init_seeds(2 + rank)
with open(opt.data) as f:
data_dict = yaml.safe_load(f) # data dict
# Loggers
loggers = {'wandb': None, 'tb': None} # loggers dict
if rank in [-1, 0]:
# TensorBoard
if not opt.evolve:
prefix = colorstr('tensorboard: ')
logger.info(f"{prefix}Start with 'tensorboard --logdir {opt.project}', view at http://localhost:6006/")
loggers['tb'] = SummaryWriter(opt.save_dir)
# W&B
opt.hyp = hyp # add hyperparameters
run_id = torch.load(weights).get('wandb_id') if weights.endswith('.pt') and os.path.isfile(weights) else None
wandb_logger = WandbLogger(opt, save_dir.stem, run_id, data_dict)
loggers['wandb'] = wandb_logger.wandb
data_dict = wandb_logger.data_dict
if wandb_logger.wandb:
weights, epochs, hyp = opt.weights, opt.epochs, opt.hyp # may update weights, epochs if resuming
nc = 1 if single_cls else int(data_dict['nc']) # number of classes
names = ['item'] if single_cls and len(data_dict['names']) != 1 else data_dict['names'] # class names
assert len(names) == nc, '%g names found for nc=%g dataset in %s' % (len(names), nc, opt.data) # check
is_coco = opt.data.endswith('coco.yaml') and nc == 80 # COCO dataset
# Model
pretrained = weights.endswith('.pt')
if pretrained:
with torch_distributed_zero_first(rank):
weights = attempt_download(weights) # download if not found locally
ckpt = torch.load(weights, map_location=device) # load checkpoint
model = Model(opt.cfg or ckpt['model'].yaml, ch=3, nc=nc, anchors=hyp.get('anchors')).to(device) # create
exclude = ['anchor'] if (opt.cfg or hyp.get('anchors')) and not opt.resume else [] # exclude keys
state_dict = ckpt['model'].float().state_dict() # to FP32
state_dict = intersect_dicts(state_dict, model.state_dict(), exclude=exclude) # intersect
model.load_state_dict(state_dict, strict=False) # load
logger.info('Transferred %g/%g items from %s' % (len(state_dict), len(model.state_dict()), weights)) # report
else:
model = Model(opt.cfg, ch=3, nc=nc, anchors=hyp.get('anchors')).to(device) # create
with torch_distributed_zero_first(rank):
check_dataset(data_dict) # check
train_path = data_dict['train']
test_path = data_dict['val']
# Freeze
freeze = [] # parameter names to freeze (full or partial)
for k, v in model.named_parameters():
v.requires_grad = True # train all layers
if any(x in k for x in freeze):
print('freezing %s' % k)
v.requires_grad = False
# Optimizer
nbs = 64 # nominal batch size
accumulate = max(round(nbs / total_batch_size), 1) # accumulate loss before optimizing
hyp['weight_decay'] *= total_batch_size * accumulate / nbs # scale weight_decay
logger.info(f"Scaled weight_decay = {hyp['weight_decay']}")
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_modules():
if hasattr(v, 'bias') and isinstance(v.bias, nn.Parameter):
pg2.append(v.bias) # biases
if isinstance(v, nn.BatchNorm2d):
pg0.append(v.weight) # no decay
elif hasattr(v, 'weight') and isinstance(v.weight, nn.Parameter):
pg1.append(v.weight) # apply decay
if opt.adam:
optimizer = optim.Adam(pg0, lr=hyp['lr0'], betas=(hyp['momentum'], 0.999)) # adjust beta1 to momentum
else:
optimizer = optim.SGD(pg0, lr=hyp['lr0'], momentum=hyp['momentum'], nesterov=True)
optimizer.add_param_group({'params': pg1, 'weight_decay': hyp['weight_decay']}) # add pg1 with weight_decay
optimizer.add_param_group({'params': pg2}) # add pg2 (biases)
logger.info('Optimizer groups: %g .bias, %g conv.weight, %g other' % (len(pg2), len(pg1), len(pg0)))
del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
# https://pytorch.org/docs/stable/_modules/torch/optim/lr_scheduler.html#OneCycleLR
if opt.linear_lr:
lf = lambda x: (1 - x / (epochs - 1)) * (1.0 - hyp['lrf']) + hyp['lrf'] # linear
else:
lf = one_cycle(1, hyp['lrf'], epochs) # cosine 1->hyp['lrf']
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs)
# EMA
ema = ModelEMA(model) if rank in [-1, 0] else None
# Resume
start_epoch, best_fitness = 0, 0.0
if pretrained:
# Optimizer
if ckpt['optimizer'] is not None:
optimizer.load_state_dict(ckpt['optimizer'])
best_fitness = ckpt['best_fitness']
# EMA
if ema and ckpt.get('ema'):
ema.ema.load_state_dict(ckpt['ema'].float().state_dict())
ema.updates = ckpt['updates']
# Results
if ckpt.get('training_results') is not None:
results_file.write_text(ckpt['training_results']) # write results.txt
# Epochs
start_epoch = ckpt['epoch'] + 1
if opt.resume:
assert start_epoch > 0, '%s training to %g epochs is finished, nothing to resume.' % (weights, epochs)
if epochs < start_epoch:
logger.info('%s has been trained for %g epochs. Fine-tuning for %g additional epochs.' %
(weights, ckpt['epoch'], epochs))
epochs += ckpt['epoch'] # finetune additional epochs
del ckpt, state_dict
# Image sizes
gs = max(int(model.stride.max()), 32) # grid size (max stride)
nl = model.model[-1].nl # number of detection layers (used for scaling hyp['obj'])
imgsz, imgsz_test = [check_img_size(x, gs) for x in opt.img_size] # verify imgsz are gs-multiples
# DP mode
if cuda and rank == -1 and torch.cuda.device_count() > 1:
model = torch.nn.DataParallel(model)
# SyncBatchNorm
if opt.sync_bn and cuda and rank != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
logger.info('Using SyncBatchNorm()')
# Trainloader
dataloader, dataset = create_dataloader(train_path, imgsz, batch_size, gs, single_cls,
hyp=hyp, augment=True, cache=opt.cache_images, rect=opt.rect, rank=rank,
world_size=opt.world_size, workers=opt.workers,
image_weights=opt.image_weights, quad=opt.quad, prefix=colorstr('train: '))
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches
assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (mlc, nc, opt.data, nc - 1)
# Process 0
if rank in [-1, 0]:
testloader = create_dataloader(test_path, imgsz_test, batch_size * 2, gs, single_cls,
hyp=hyp, cache=opt.cache_images and not opt.notest, rect=True, rank=-1,
world_size=opt.world_size, workers=opt.workers,
pad=0.5, prefix=colorstr('val: '))[0]
if not opt.resume:
labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1. # frequency
# model._initialize_biases(cf.to(device))
if plots:
plot_labels(labels, names, save_dir, loggers)
if loggers['tb']:
loggers['tb'].add_histogram('classes', c, 0) # TensorBoard
# Anchors
if not opt.noautoanchor:
check_anchors(dataset, model=model, thr=hyp['anchor_t'], imgsz=imgsz)
model.half().float() # pre-reduce anchor precision
# DDP mode
if cuda and rank != -1:
model = DDP(model, device_ids=[opt.local_rank], output_device=opt.local_rank,
# nn.MultiheadAttention incompatibility with DDP https://github.com/pytorch/pytorch/issues/26698
find_unused_parameters=any(isinstance(layer, nn.MultiheadAttention) for layer in model.modules()))
# Model parameters
hyp['box'] *= 3. / nl # scale to layers
hyp['cls'] *= nc / 80. * 3. / nl # scale to classes and layers
hyp['obj'] *= (imgsz / 640) ** 2 * 3. / nl # scale to image size and layers
hyp['label_smoothing'] = opt.label_smoothing
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.gr = 1.0 # iou loss ratio (obj_loss = 1.0 or iou)
model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device) * nc # attach class weights
model.names = names
# Start training
t0 = time.time()
nw = max(round(hyp['warmup_epochs'] * nb), 1000) # number of warmup iterations, max(3 epochs, 1k iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
maps = np.zeros(nc) # mAP per class
results = (0, 0, 0, 0, 0, 0, 0) # P, R, [email protected], [email protected], val_loss(box, obj, cls)
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
compute_loss = ComputeLoss(model) # init loss class
logger.info(f'Image sizes {imgsz} train, {imgsz_test} test\n'
f'Using {dataloader.num_workers} dataloader workers\n'
f'Logging results to {save_dir}\n'
f'Starting training for {epochs} epochs...')
for epoch in range(start_epoch, epochs): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional)
if opt.image_weights:
# Generate indices
if rank in [-1, 0]:
cw = model.class_weights.cpu().numpy() * (1 - maps) ** 2 / nc # class weights
iw = labels_to_image_weights(dataset.labels, nc=nc, class_weights=cw) # image weights
dataset.indices = random.choices(range(dataset.n), weights=iw, k=dataset.n) # rand weighted idx
# Broadcast if DDP
if rank != -1:
indices = (torch.tensor(dataset.indices) if rank == 0 else torch.zeros(dataset.n)).int()
dist.broadcast(indices, 0)
if rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(4, device=device) # mean losses
if rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
logger.info(('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'box', 'obj', 'cls', 'total', 'labels', 'img_size'))
if rank in [-1, 0]:
pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (imgs, targets, paths, _) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float() / 255.0 # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # iou loss ratio (obj_loss = 1.0 or iou)
accumulate = max(1, np.interp(ni, xi, [1, nbs / total_batch_size]).round())
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x['lr'] = np.interp(ni, xi, [hyp['warmup_bias_lr'] if j == 2 else 0.0, x['initial_lr'] * lf(epoch)])
if 'momentum' in x:
x['momentum'] = np.interp(ni, xi, [hyp['warmup_momentum'], hyp['momentum']])
# Multi-scale
if opt.multi_scale:
sz = random.randrange(imgsz * 0.5, imgsz * 1.5 + gs) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]] # new shape (stretched to gs-multiple)
imgs = F.interpolate(imgs, size=ns, mode='bilinear', align_corners=False)
# Forward
with amp.autocast(enabled=cuda):
pred = model(imgs) # forward
loss, loss_items = compute_loss(pred, targets.to(device)) # loss scaled by batch_size
if rank != -1:
loss *= opt.world_size # gradient averaged between devices in DDP mode
if opt.quad:
loss *= 4.
# Backward
scaler.scale(loss).backward()
# Optimize
if ni % accumulate == 0:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema:
ema.update(model)
# Print
if rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_reserved() / 1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.4g' * 6) % (
f'{epoch}/{epochs - 1}', mem, *mloss, targets.shape[0], imgs.shape[-1])
pbar.set_description(s)
# Plot
if plots and ni < 3:
f = save_dir / f'train_batch{ni}.jpg' # filename
Thread(target=plot_images, args=(imgs, targets, paths, f), daemon=True).start()
if loggers['tb'] and ni == 0: # TensorBoard
with warnings.catch_warnings():
warnings.simplefilter('ignore') # suppress jit trace warning
loggers['tb'].add_graph(torch.jit.trace(de_parallel(model), imgs[0:1], strict=False), [])
elif plots and ni == 10 and wandb_logger.wandb:
wandb_logger.log({'Mosaics': [wandb_logger.wandb.Image(str(x), caption=x.name) for x in
save_dir.glob('train*.jpg') if x.exists()]})
# end batch ------------------------------------------------------------------------------------------------
# Scheduler
lr = [x['lr'] for x in optimizer.param_groups] # for loggers
scheduler.step()
# DDP process 0 or single-GPU
if rank in [-1, 0]:
# mAP
ema.update_attr(model, include=['yaml', 'nc', 'hyp', 'gr', 'names', 'stride', 'class_weights'])
final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP
wandb_logger.current_epoch = epoch + 1
results, maps, _ = test.test(data_dict,
batch_size=batch_size * 2,
imgsz=imgsz_test,
model=ema.ema,
single_cls=single_cls,
dataloader=testloader,
save_dir=save_dir,
save_json=is_coco and final_epoch,
verbose=nc < 50 and final_epoch,
plots=plots and final_epoch,
wandb_logger=wandb_logger,
compute_loss=compute_loss)
# Write
with open(results_file, 'a') as f:
f.write(s + '%10.4g' * 7 % results + '\n') # append metrics, val_loss
# Log
tags = ['train/box_loss', 'train/obj_loss', 'train/cls_loss', # train loss
'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5', 'metrics/mAP_0.5:0.95',
'val/box_loss', 'val/obj_loss', 'val/cls_loss', # val loss
'x/lr0', 'x/lr1', 'x/lr2'] # params
for x, tag in zip(list(mloss[:-1]) + list(results) + lr, tags):
if loggers['tb']:
loggers['tb'].add_scalar(tag, x, epoch) # TensorBoard
if wandb_logger.wandb:
wandb_logger.log({tag: x}) # W&B
# Update best mAP
fi = fitness(np.array(results).reshape(1, -1)) # weighted combination of [P, R, [email protected], [email protected]]
if fi > best_fitness:
best_fitness = fi
wandb_logger.end_epoch(best_result=best_fitness == fi)
# Save model
if (not opt.nosave) or (final_epoch and not opt.evolve): # if save
ckpt = {'epoch': epoch,
'best_fitness': best_fitness,
'training_results': results_file.read_text(),
'model': deepcopy(de_parallel(model)).half(),
'ema': deepcopy(ema.ema).half(),
'updates': ema.updates,
'optimizer': optimizer.state_dict(),
'wandb_id': wandb_logger.wandb_run.id if wandb_logger.wandb else None}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
if wandb_logger.wandb:
if ((epoch + 1) % opt.save_period == 0 and not final_epoch) and opt.save_period != -1:
wandb_logger.log_model(last.parent, opt, epoch, fi, best_model=best_fitness == fi)
del ckpt
# end epoch ----------------------------------------------------------------------------------------------------
# end training -----------------------------------------------------------------------------------------------------
if rank in [-1, 0]:
logger.info(f'{epoch - start_epoch + 1} epochs completed in {(time.time() - t0) / 3600:.3f} hours.\n')
if plots:
plot_results(save_dir=save_dir) # save as results.png
if wandb_logger.wandb:
files = ['results.png', 'confusion_matrix.png', *[f'{x}_curve.png' for x in ('F1', 'PR', 'P', 'R')]]
wandb_logger.log({"Results": [wandb_logger.wandb.Image(str(save_dir / f), caption=f) for f in files
if (save_dir / f).exists()]})
if not opt.evolve:
if is_coco: # COCO dataset
for m in [last, best] if best.exists() else [last]: # speed, mAP tests
results, _, _ = test.test(opt.data,
batch_size=batch_size * 2,
imgsz=imgsz_test,
conf_thres=0.001,
iou_thres=0.7,
model=attempt_load(m, device).half(),
single_cls=single_cls,
dataloader=testloader,
save_dir=save_dir,
save_json=True,
plots=False)
# Strip optimizers
for f in last, best:
if f.exists():
strip_optimizer(f) # strip optimizers
if wandb_logger.wandb: # Log the stripped model
wandb_logger.wandb.log_artifact(str(best if best.exists() else last), type='model',
name='run_' + wandb_logger.wandb_run.id + '_model',
aliases=['latest', 'best', 'stripped'])
wandb_logger.finish_run()
else:
dist.destroy_process_group()
torch.cuda.empty_cache()
return results
def main_worker(gpu, ngpus_per_node, args):
global best_acc1
args.gpu = gpu
if args.is_distributed:
print(
"INFO:PyTorch: Initialize process group for distributed training")
if args.dist_url == "env://" and args.rank == -1:
args.rank = int(os.environ["RANK"])
if args.multiprocessing_distributed:
# For multiprocessing distributed training, rank needs to be the
# global rank among all the processes
args.rank = args.rank * ngpus_per_node + gpu
distributed.init_process_group(backend=args.dist_backend,
init_method=args.dist_url,
world_size=args.world_size,
rank=args.rank)
if args.gpu is not None:
if not args.evaluate:
print(
"INFO:PyTorch: Use GPU: {} for training, the rank of this GPU is {}"
.format(args.gpu, args.rank))
else:
print(
"INFO:PyTorch: Use GPU: {} for evaluating, the rank of this GPU is {}"
.format(args.gpu, args.rank))
# set the name of the process
setproctitle.setproctitle(args.proc_name + '_rank{}'.format(args.rank))
if not args.multiprocessing_distributed or \
(args.multiprocessing_distributed and args.rank % ngpus_per_node == 0):
# define tensorboard summary
val_writer = SummaryWriter(log_dir=os.path.join(args.model_dir, 'val'))
# define loss function (criterion) and optimizer
if args.is_label_smoothing:
criterion = label_smoothing.label_smoothing_CE(reduction='mean')
else:
criterion = nn.CrossEntropyLoss()
# create model
if args.pretrained:
model_info = "INFO:PyTorch: using pre-trained model '{}'".format(
args.arch)
else:
model_info = "INFO:PyTorch: creating model '{}'".format(args.arch)
print(model_info)
model = splitnet.SplitNet(args,
norm_layer=norm.norm(args.norm_mode),
criterion=criterion)
# print the number of parameters in the model
print("INFO:PyTorch: The number of parameters in the model is {}".format(
metric.get_the_number_of_params(model)))
if args.is_summary:
summary_choice = 0
if summary_choice == 0:
summary.summary(model,
torch.rand((1, 3, args.crop_size, args.crop_size)),
target=torch.ones(1, dtype=torch.long))
else:
flops, params = profile(model,
inputs=(torch.rand((1, 3, args.crop_size,
args.crop_size)),
torch.ones(1, dtype=torch.long),
'summary'))
print(clever_format([flops, params], "%.4f"))
return None
if args.is_distributed:
if args.world_size > 1 and args.is_syncbn:
print(
"INFO:PyTorch: convert torch.nn.BatchNormND layer in the model to torch.nn.SyncBatchNorm layer"
)
# only single gpu per process is currently supported
model = nn.SyncBatchNorm.convert_sync_batchnorm(model)
# For multiprocessing distributed, DistributedDataParallel constructor
# should always set the single device scope, otherwise,
# DistributedDataParallel will use all available devices.
if args.gpu is not None:
torch.cuda.set_device(args.gpu)
model.cuda(args.gpu)
# When using a single GPU per process and per
# DistributedDataParallel, we need to divide the batch size
# ourselves based on the total number of GPUs we have
args.batch_size = int(args.batch_size / ngpus_per_node)
args.workers = int(
(args.workers + ngpus_per_node - 1) / ngpus_per_node)
model = torch.nn.parallel.DistributedDataParallel(
model, device_ids=[args.gpu], find_unused_parameters=True)
else:
model.cuda()
# DistributedDataParallel will divide and allocate batch_size to all
# available GPUs if device_ids are not set
model = torch.nn.parallel.DistributedDataParallel(model)
elif args.gpu is not None:
torch.cuda.set_device(args.gpu)
model = model.cuda(args.gpu)
else:
# DataParallel will divide and allocate batch_size to all available GPUs
if args.arch.startswith('alexnet') or args.arch.startswith('vgg'):
model.features = torch.nn.DataParallel(model.features)
model.cuda()
else:
model = torch.nn.DataParallel(model).cuda()
# optimizer
param_groups = model.parameters(
) if args.is_wd_all else lr_scheduler.get_parameter_groups(model)
if args.is_wd_all:
print(
"INFO:PyTorch: Applying weight decay to all learnable parameters in the model."
)
if args.optimizer == 'SGD':
print("INFO:PyTorch: using SGD optimizer.")
optimizer = torch.optim.SGD(
param_groups,
args.lr,
momentum=args.momentum,
weight_decay=args.weight_decay,
nesterov=True if args.is_nesterov else False)
elif args.optimizer == "AdamW":
print("INFO:PyTorch: using AdamW optimizer.")
optimizer = torch.optim.AdamW(param_groups,
lr=args.lr,
betas=(0.9, 0.999),
eps=1e-4,
weight_decay=args.weight_decay)
elif args.optimizer == "RMSprop":
# See efficientNet at https://github.com/tensorflow/tpu/
print("INFO:PyTorch: using RMSprop optimizer.")
optimizer = torch.optim.RMSprop(param_groups,
lr=args.lr,
alpha=0.9,
weight_decay=args.weight_decay,
momentum=0.9)
elif args.optimizer == "RMSpropTF":
# https://github.com/rwightman/pytorch-image-models/blob/fcb6258877/timm/optim/rmsprop_tf.py
print("INFO:PyTorch: using RMSpropTF optimizer.")
optimizer = rmsprop_tf.RMSpropTF(param_groups,
lr=args.lr,
alpha=0.9,
eps=0.001,
weight_decay=args.weight_decay,
momentum=0.9,
decoupled_decay=False)
else:
raise NotImplementedError
# PyTorch AMP loss scaler
scaler = None if not args.is_amp else amp.GradScaler()
# optionally resume from a checkpoint
if args.resume:
if os.path.isfile(args.resume):
print("INFO:PyTorch: => loading checkpoint '{}'".format(
args.resume))
if args.gpu is None:
checkpoint = torch.load(args.resume)
else:
# Map model to be loaded to specified single gpu.
loc = 'cuda:{}'.format(args.gpu)
checkpoint = torch.load(args.resume, map_location=loc)
args.start_epoch = checkpoint['epoch']
best_acc1 = checkpoint['best_acc1']
"""
if args.gpu is not None:
# best_acc1 may be from a checkpoint from a different GPU
best_acc1 = best_acc1.to(args.gpu)
"""
model.load_state_dict(checkpoint['state_dict'])
print("INFO:PyTorch: Loading state_dict of optimizer")
optimizer.load_state_dict(checkpoint['optimizer'])
if "scaler" in checkpoint:
print("INFO:PyTorch: Loading state_dict of AMP loss scaler")
scaler.load_state_dict(checkpoint['scaler'])
print("INFO:PyTorch: => loaded checkpoint '{}' (epoch {})".format(
args.resume, checkpoint['epoch']))
else:
print("INFO:PyTorch: => no checkpoint found at '{}'".format(
args.resume))
# accelarate the training
torch.backends.cudnn.benchmark = True
# Data loading code
data_split_factor = args.loop_factor if args.is_diff_data_train else 1
print("INFO:PyTorch: => The number of views of train data is '{}'".format(
data_split_factor))
train_loader, train_sampler = factory.get_data_loader(
args.data,
split_factor=data_split_factor,
batch_size=args.batch_size,
crop_size=args.crop_size,
dataset=args.dataset,
split="train",
is_distributed=args.is_distributed,
is_autoaugment=args.is_autoaugment,
randaa=args.randaa,
is_cutout=args.is_cutout,
erase_p=args.erase_p,
num_workers=args.workers)
val_loader = factory.get_data_loader(args.data,
batch_size=args.eval_batch_size,
crop_size=args.crop_size,
dataset=args.dataset,
split="val",
num_workers=args.workers)
# learning rate scheduler
scheduler = lr_scheduler.lr_scheduler(
mode=args.lr_mode,
init_lr=args.lr,
num_epochs=args.epochs,
iters_per_epoch=len(train_loader),
lr_milestones=args.lr_milestones,
lr_step_multiplier=args.lr_step_multiplier,
slow_start_epochs=args.slow_start_epochs,
slow_start_lr=args.slow_start_lr,
end_lr=args.end_lr,
multiplier=args.lr_multiplier,
decay_factor=args.decay_factor,
decay_epochs=args.decay_epochs,
staircase=True)
if args.evaluate:
validate(val_loader, model, args)
return None
saved_ckpt_filenames = []
streams = None
# streams = [torch.cuda.Stream() for i in range(args.loop_factor)]
for epoch in range(args.start_epoch, args.epochs + 1):
if args.is_distributed:
train_sampler.set_epoch(epoch)
# train for one epoch
train(train_loader,
model,
optimizer,
scheduler,
epoch,
args,
streams,
scaler=scaler)
if (epoch + 1) % args.eval_per_epoch == 0:
# evaluate on validation set
acc_all = validate(val_loader, model, args)
# remember best acc@1 and save checkpoint
is_best = acc_all[0] > best_acc1
best_acc1 = max(acc_all[0], best_acc1)
# save checkpoint
if not args.multiprocessing_distributed or \
(args.multiprocessing_distributed and args.rank % ngpus_per_node == 0):
# summary per epoch
val_writer.add_scalar('avg_acc1',
acc_all[0],
global_step=epoch)
if args.dataset == 'imagenet':
val_writer.add_scalar('avg_acc5',
acc_all[1],
global_step=epoch)
for i in range(2, args.loop_factor + 2):
val_writer.add_scalar('{}_acc1'.format(i - 1),
acc_all[i],
global_step=epoch)
val_writer.add_scalar('learning_rate',
optimizer.param_groups[0]['lr'],
global_step=epoch)
val_writer.add_scalar('best_acc1',
best_acc1,
global_step=epoch)
# save checkpoints
filename = "checkpoint_{0}.pth.tar".format(epoch)
saved_ckpt_filenames.append(filename)
# remove the oldest file if the number of saved ckpts is greater than args.max_ckpt_nums
if len(saved_ckpt_filenames) > args.max_ckpt_nums:
os.remove(
os.path.join(args.model_dir,
saved_ckpt_filenames.pop(0)))
ckpt_dict = {
'epoch': epoch + 1,
'arch': args.arch,
'state_dict': model.state_dict(),
'best_acc1': best_acc1,
'optimizer': optimizer.state_dict(),
}
if args.is_amp:
ckpt_dict['scaler'] = scaler.state_dict()
metric.save_checkpoint(ckpt_dict,
is_best,
args.model_dir,
filename=filename)
# clean GPU cache
torch.cuda.empty_cache()
sys.exit(0)
def __init__(
self,
model: Model,
optimizer: torch.optim.Optimizer,
data_loader: DataLoader,
patience: Optional[int] = None,
validation_metric: Union[str, List[str]] = "-loss",
validation_data_loader: DataLoader = None,
num_epochs: int = 20,
serialization_dir: Optional[str] = None,
checkpointer: Checkpointer = None,
cuda_device: Optional[Union[int, torch.device]] = None,
grad_norm: Optional[float] = None,
grad_clipping: Optional[float] = None,
learning_rate_scheduler: Optional[LearningRateScheduler] = None,
momentum_scheduler: Optional[MomentumScheduler] = None,
moving_average: Optional[MovingAverage] = None,
callbacks: List[TrainerCallback] = None,
distributed: bool = False,
local_rank: int = 0,
world_size: int = 1,
num_gradient_accumulation_steps: int = 1,
use_amp: bool = False,
enable_default_callbacks: bool = True,
run_sanity_checks: bool = True,
) -> None:
super().__init__(
serialization_dir=serialization_dir,
cuda_device=cuda_device,
distributed=distributed,
local_rank=local_rank,
world_size=world_size,
)
# I am not calling move_to_gpu here, because if the model is
# not already on the GPU then the optimizer is going to be wrong.
self.model = model
self.data_loader = data_loader
self.data_loader.set_target_device(self.cuda_device)
self._validation_data_loader = validation_data_loader
if self._validation_data_loader is not None:
self._validation_data_loader.set_target_device(self.cuda_device)
self.optimizer = optimizer
if patience is None: # no early stopping
if validation_data_loader is not None:
logger.warning(
"You provided a validation dataset but patience was set to None, "
"meaning that early stopping is disabled"
)
elif (not isinstance(patience, int)) or patience <= 0:
raise ConfigurationError(
'{} is an invalid value for "patience": it must be a positive integer '
"or None (if you want to disable early stopping)".format(patience)
)
# For tracking is_best_so_far and should_stop_early
self._metric_tracker = MetricTracker(validation_metric, patience)
self._num_epochs = num_epochs
self._checkpointer: Optional[Checkpointer] = checkpointer
if checkpointer is None and serialization_dir is not None:
self._checkpointer = Checkpointer(serialization_dir)
self._grad_norm = grad_norm
self._grad_clipping = grad_clipping
self._learning_rate_scheduler = learning_rate_scheduler
self._momentum_scheduler = momentum_scheduler
self._moving_average = moving_average
self._callbacks = callbacks or []
default_callbacks = list(DEFAULT_CALLBACKS) if enable_default_callbacks else []
if run_sanity_checks:
default_callbacks.append(SanityChecksCallback)
for callback_cls in default_callbacks:
for callback in self._callbacks:
if callback.__class__ == callback_cls:
break
else:
self._callbacks.append(callback_cls(self._serialization_dir))
self._batch_num_total = 0
self._last_log = 0.0 # time of last logging
self._num_gradient_accumulation_steps = num_gradient_accumulation_steps
# Enable automatic mixed precision training.
self._scaler: Optional[amp.GradScaler] = None
self._use_amp = use_amp
if self._use_amp:
if self.cuda_device == torch.device("cpu"):
raise ValueError("Using AMP requires a cuda device")
self._scaler = amp.GradScaler()
# Using `DistributedDataParallel`(ddp) brings in a quirk wrt AllenNLP's `Model` interface and its
# usage. A `Model` object is wrapped by `ddp`, but assigning the wrapped model to `self.model`
# will break the usages such as `Model.get_regularization_penalty`, `Model.get_metrics`, etc.
#
# Hence a reference to Pytorch's object is maintained in the case of distributed training and in the
# normal case, reference to `Model` is retained. This reference is only used in
# these places: `model.__call__`, `model.train` and `model.eval`.
if self._distributed:
self._pytorch_model = DistributedDataParallel(
self.model,
device_ids=None if self.cuda_device == torch.device("cpu") else [self.cuda_device],
find_unused_parameters=True,
)
else:
self._pytorch_model = self.model
def main():
fold = 0
epoch = 3
mode = 1
batch = 2
num_workers = 1
SEED = 13
init_lr = 3e-4
warmup_factor = 10 #how long
warmup_epo = 1
log = True
seed_everything(SEED)
model = HUB_MODELS['efficientnet-b0']('efficientnet-b0')
model.to(DEVICE)
df = pd.read_csv(os.path.join(path_data, 'train_folds.csv'))
kernel = type(model).__name__
tr_idx = np.where(df.fold != fold)[0]
vl_idx = np.where(df.fold == fold)[0]
transforms_train = A.Compose([
# A.OneOf([
# A.ShiftScaleRotate(shift_limit=0.05, scale_limit=0.1, rotate_limit=15),
# A.OpticalDistortion(distort_limit=0.11, shift_limit=0.15),
# A.NoOp()
# ]),
# A.OneOf([
# A.RandomBrightnessContrast(brightness_limit=0.2, contrast_limit=0.2),
# A.RandomGamma(gamma_limit=(50, 150)),
# A.NoOp()
# ]),
# A.OneOf([
# A.RGBShift(r_shift_limit=20, b_shift_limit=15, g_shift_limit=15),
# A.FancyPCA(3),
# A.HueSaturationValue(hue_shift_limit=5, sat_shift_limit=5),
# A.NoOp()
# ]),
# A.OneOf([
# A.CLAHE(),
# A.NoOp()
# ]),
A.Transpose(p=0.5),
A.VerticalFlip(p=0.5),
A.HorizontalFlip(p=0.5),
])
# transforms_val = albumentations.Compose([])
dataset = {
'npy': [trainDataset_npy, 16],
'pkl': [trainDataset_pkl, 25],
'insta': [trainDataset_insta, None]
}
trainDataset, num = dataset['pkl']
td = trainDataset(df.iloc[tr_idx],
df.iloc[tr_idx].isup_grade,
num,
rand=True,
transform=transforms_train)
vd = trainDataset(df.iloc[vl_idx],
df.iloc[vl_idx].isup_grade,
num,
rand=False,
transform=transforms_train)
train_dl = DataLoader(td,
batch_size=batch,
sampler=RandomSampler(td),
num_workers=num_workers)
val_dl = DataLoader(vd,
batch_size=batch,
sampler=SequentialSampler(vd),
num_workers=num_workers)
optimizer = Adam(model.parameters(), lr=init_lr / warmup_factor)
scheduler_cosine = torch.optim.lr_scheduler.CosineAnnealingLR(
optimizer, epoch - warmup_epo)
scheduler = GradualWarmupScheduler(optimizer,
multiplier=warmup_factor,
total_epoch=warmup_epo,
after_scheduler=scheduler_cosine)
criterion = nn.BCEWithLogitsLoss()
scaler = amp.GradScaler()
qwk_max = 0
for i in range(1, epoch + 1):
print(f'Epoch: {i}')
scheduler.step(i - 1)
model.train()
loss = train_epoch(model, train_dl, criterion, scaler, optimizer)
model.eval()
with torch.no_grad():
val_loss, pred, val_lab = train_epoch(model, val_dl, criterion,
None, None)
p = torch.cat(pred).cpu().numpy()
t = torch.cat(val_lab).cpu().numpy()
acc = (p == t).mean() * 100.
qwk = cohen_kappa_score(p, t, weights='quadratic')
#sch.step(val_loss) # Plateau
if log:
print('Log.....')
lg = time.ctime(
) + ' ' + f'Epoch {i}, lr: {optimizer.param_groups[0]["lr"]:.7f}, train loss: {np.mean(loss):.5f}, val loss: {np.mean(val_loss):.5f}, acc: {(acc):.5f}, qwk: {(qwk):.5f}, fold: {fold+1}'
print(lg)
with open(os.path.join(path_log, f'log_{kernel}_kaggle.txt'),
'a') as appender:
appender.write(lg + '\n')
if qwk > qwk_max:
print('Best ({:.6f} --> {:.6f}). Saving model ...'.format(
qwk_max, qwk))
torch.save(
model.state_dict(),
os.path.join(
path_model,
f'{kernel}_kaggle_best_fold{fold+1}_epoch_{i}.pth'))
qwk_max = qwk
#make checkpoint
#problem in win
# name_check = '_'.join(time.ctime().split(':')) + '_model.pt'
# torch.save({
# 'epoch': i,
# 'model_state_dict': model.state_dict(),
# 'optimizer_state_dict': optimizer.state_dict()
# }, os.path.join(path_checkpoint, name_check))
torch.save(
model.state_dict(),
os.path.join(path_model, '{kernel}_kaggle_final_fold{fold+1}.pth'))
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.scaler = amp.GradScaler()
def train(hyp, opt, device, tb_writer=None, wandb=None):
logger.info(f'Hyperparameters {hyp}')
save_dir, epochs, batch_size, total_batch_size, weights, rank = \
Path(opt.save_dir), opt.epochs, opt.batch_size, opt.total_batch_size, opt.weights, opt.global_rank
# Directories
wdir = save_dir / 'weights'
wdir.mkdir(parents=True, exist_ok=True) # make dir
last = wdir / 'last.pt'
best = wdir / 'best.pt'
results_file = save_dir / 'results.txt'
# Save run settings
with open(save_dir / 'hyp.yaml', 'w') as f:
yaml.dump(hyp, f, sort_keys=False)
with open(save_dir / 'opt.yaml', 'w') as f:
yaml.dump(vars(opt), f, sort_keys=False)
# Configure
plots = not opt.evolve # create plots
cuda = device.type != 'cpu'
init_seeds(2 + rank)
with open(opt.data) as f:
data_dict = yaml.load(f, Loader=yaml.FullLoader) # data dict
with torch_distributed_zero_first(rank):
check_dataset(data_dict) # check
train_path = data_dict['train']
test_path = data_dict['val']
nc = 1 if opt.single_cls else int(data_dict['nc']) # number of classes
names = ['item'] if opt.single_cls and len(data_dict['names']) != 1 else data_dict['names'] # class names
assert len(names) == nc, '%g names found for nc=%g dataset in %s' % (len(names), nc, opt.data) # check
# Model
pretrained = weights.endswith('.pt')
if pretrained:
with torch_distributed_zero_first(rank):
attempt_download(weights) # download if not found locally
ckpt = torch.load(weights, map_location=device) # load checkpoint
if hyp.get('anchors'):
ckpt['model'].yaml['anchors'] = round(hyp['anchors']) # force autoanchor
model = Model(opt.cfg or ckpt['model'].yaml, ch=3, nc=nc).to(device) # create
exclude = ['anchor'] if opt.cfg or hyp.get('anchors') else [] # exclude keys
state_dict = ckpt['model'].float().state_dict() # to FP32
state_dict = intersect_dicts(state_dict, model.state_dict(), exclude=exclude) # intersect
model.load_state_dict(state_dict, strict=False) # load
logger.info('Transferred %g/%g items from %s' % (len(state_dict), len(model.state_dict()), weights)) # report
else:
model = Model(opt.cfg, ch=3, nc=nc).to(device) # create
# Freeze
freeze = [] # parameter names to freeze (full or partial)
for k, v in model.named_parameters():
v.requires_grad = True # train all layers
if any(x in k for x in freeze):
print('freezing %s' % k)
v.requires_grad = False
# Optimizer
nbs = 64 # nominal batch size
accumulate = max(round(nbs / total_batch_size), 1) # accumulate loss before optimizing
hyp['weight_decay'] *= total_batch_size * accumulate / nbs # scale weight_decay
pg0, pg1, pg2 = [], [], [] # optimizer parameter groups
for k, v in model.named_modules():
if hasattr(v, 'bias') and isinstance(v.bias, nn.Parameter):
pg2.append(v.bias) # biases
if isinstance(v, nn.BatchNorm2d):
pg0.append(v.weight) # no decay
elif hasattr(v, 'weight') and isinstance(v.weight, nn.Parameter):
pg1.append(v.weight) # apply decay
if opt.adam:
optimizer = optim.Adam(pg0, lr=hyp['lr0'], betas=(hyp['momentum'], 0.999)) # adjust beta1 to momentum
else:
optimizer = optim.SGD(pg0, lr=hyp['lr0'], momentum=hyp['momentum'], nesterov=True)
optimizer.add_param_group({'params': pg1, 'weight_decay': hyp['weight_decay']}) # add pg1 with weight_decay
optimizer.add_param_group({'params': pg2}) # add pg2 (biases)
logger.info('Optimizer groups: %g .bias, %g conv.weight, %g other' % (len(pg2), len(pg1), len(pg0)))
del pg0, pg1, pg2
# Scheduler https://arxiv.org/pdf/1812.01187.pdf
# https://pytorch.org/docs/stable/_modules/torch/optim/lr_scheduler.html#OneCycleLR
lf = lambda x: ((1 + math.cos(x * math.pi / epochs)) / 2) * (1 - hyp['lrf']) + hyp['lrf'] # cosine
scheduler = lr_scheduler.LambdaLR(optimizer, lr_lambda=lf)
# plot_lr_scheduler(optimizer, scheduler, epochs)
# Logging
if wandb and wandb.run is None:
opt.hyp = hyp # add hyperparameters
wandb_run = wandb.init(config=opt, resume="allow",
project='YOLOv5' if opt.project == 'runs/train' else Path(opt.project).stem,
name=save_dir.stem,
id=ckpt.get('wandb_id') if 'ckpt' in locals() else None)
loggers = {'wandb': wandb} # loggers dict
# Resume
start_epoch, best_fitness = 0, 0.0
if pretrained:
# Optimizer
if ckpt['optimizer'] is not None:
optimizer.load_state_dict(ckpt['optimizer'])
best_fitness = ckpt['best_fitness']
# Results
if ckpt.get('training_results') is not None:
with open(results_file, 'w') as file:
file.write(ckpt['training_results']) # write results.txt
# Epochs
start_epoch = ckpt['epoch'] + 1
if opt.resume:
assert start_epoch > 0, '%s training to %g epochs is finished, nothing to resume.' % (weights, epochs)
if epochs < start_epoch:
logger.info('%s has been trained for %g epochs. Fine-tuning for %g additional epochs.' %
(weights, ckpt['epoch'], epochs))
epochs += ckpt['epoch'] # finetune additional epochs
del ckpt, state_dict
# Image sizes
gs = int(max(model.stride)) # grid size (max stride)
imgsz, imgsz_test = [check_img_size(x, gs) for x in opt.img_size] # verify imgsz are gs-multiples
# DP mode
if cuda and rank == -1 and torch.cuda.device_count() > 1:
model = torch.nn.DataParallel(model)
# SyncBatchNorm
if opt.sync_bn and cuda and rank != -1:
model = torch.nn.SyncBatchNorm.convert_sync_batchnorm(model).to(device)
logger.info('Using SyncBatchNorm()')
# EMA
ema = ModelEMA(model) if rank in [-1, 0] else None
# DDP mode
if cuda and rank != -1:
model = DDP(model, device_ids=[opt.local_rank], output_device=opt.local_rank)
# Trainloader
dataloader, dataset = create_dataloader(train_path, imgsz, batch_size, gs, opt,
hyp=hyp, augment=True, cache=opt.cache_images, rect=opt.rect, rank=rank,
world_size=opt.world_size, workers=opt.workers,
image_weights=opt.image_weights)
mlc = np.concatenate(dataset.labels, 0)[:, 0].max() # max label class
nb = len(dataloader) # number of batches
assert mlc < nc, 'Label class %g exceeds nc=%g in %s. Possible class labels are 0-%g' % (mlc, nc, opt.data, nc - 1)
# Process 0
if rank in [-1, 0]:
ema.updates = start_epoch * nb // accumulate # set EMA updates
testloader = create_dataloader(test_path, imgsz_test, total_batch_size, gs, opt, # testloader
hyp=hyp, cache=opt.cache_images and not opt.notest, rect=True,
rank=-1, world_size=opt.world_size, workers=opt.workers, pad=0.5)[0]
if not opt.resume:
labels = np.concatenate(dataset.labels, 0)
c = torch.tensor(labels[:, 0]) # classes
# cf = torch.bincount(c.long(), minlength=nc) + 1. # frequency
# model._initialize_biases(cf.to(device))
if plots:
Thread(target=plot_labels, args=(labels, save_dir, loggers), daemon=True).start()
if tb_writer:
tb_writer.add_histogram('classes', c, 0)
# Anchors
if not opt.noautoanchor:
check_anchors(dataset, model=model, thr=hyp['anchor_t'], imgsz=imgsz)
# Model parameters
hyp['cls'] *= nc / 80. # scale coco-tuned hyp['cls'] to current dataset
model.nc = nc # attach number of classes to model
model.hyp = hyp # attach hyperparameters to model
model.gr = 1.0 # iou loss ratio (obj_loss = 1.0 or iou)
model.class_weights = labels_to_class_weights(dataset.labels, nc).to(device) * nc # attach class weights
model.names = names
# Start training
t0 = time.time()
nw = max(round(hyp['warmup_epochs'] * nb), 1000) # number of warmup iterations, max(3 epochs, 1k iterations)
# nw = min(nw, (epochs - start_epoch) / 2 * nb) # limit warmup to < 1/2 of training
maps = np.zeros(nc) # mAP per class
results = (0, 0, 0, 0, 0, 0, 0) # P, R, [email protected], [email protected], val_loss(box, obj, cls)
scheduler.last_epoch = start_epoch - 1 # do not move
scaler = amp.GradScaler(enabled=cuda)
logger.info('Image sizes %g train, %g test\n'
'Using %g dataloader workers\nLogging results to %s\n'
'Starting training for %g epochs...' % (imgsz, imgsz_test, dataloader.num_workers, save_dir, epochs))
for epoch in range(start_epoch, epochs): # epoch ------------------------------------------------------------------
model.train()
# Update image weights (optional)
if opt.image_weights:
# Generate indices
if rank in [-1, 0]:
cw = model.class_weights.cpu().numpy() * (1 - maps) ** 2 / nc # class weights
iw = labels_to_image_weights(dataset.labels, nc=nc, class_weights=cw) # image weights
dataset.indices = random.choices(range(dataset.n), weights=iw, k=dataset.n) # rand weighted idx
# Broadcast if DDP
if rank != -1:
indices = (torch.tensor(dataset.indices) if rank == 0 else torch.zeros(dataset.n)).int()
dist.broadcast(indices, 0)
if rank != 0:
dataset.indices = indices.cpu().numpy()
# Update mosaic border
# b = int(random.uniform(0.25 * imgsz, 0.75 * imgsz + gs) // gs * gs)
# dataset.mosaic_border = [b - imgsz, -b] # height, width borders
mloss = torch.zeros(4, device=device) # mean losses
if rank != -1:
dataloader.sampler.set_epoch(epoch)
pbar = enumerate(dataloader)
logger.info(('\n' + '%10s' * 8) % ('Epoch', 'gpu_mem', 'box', 'obj', 'cls', 'total', 'targets', 'img_size'))
if rank in [-1, 0]:
pbar = tqdm(pbar, total=nb) # progress bar
optimizer.zero_grad()
for i, (imgs, targets, paths, _) in pbar: # batch -------------------------------------------------------------
ni = i + nb * epoch # number integrated batches (since train start)
imgs = imgs.to(device, non_blocking=True).float() / 255.0 # uint8 to float32, 0-255 to 0.0-1.0
# Warmup
if ni <= nw:
xi = [0, nw] # x interp
# model.gr = np.interp(ni, xi, [0.0, 1.0]) # iou loss ratio (obj_loss = 1.0 or iou)
accumulate = max(1, np.interp(ni, xi, [1, nbs / total_batch_size]).round())
for j, x in enumerate(optimizer.param_groups):
# bias lr falls from 0.1 to lr0, all other lrs rise from 0.0 to lr0
x['lr'] = np.interp(ni, xi, [hyp['warmup_bias_lr'] if j == 2 else 0.0, x['initial_lr'] * lf(epoch)])
if 'momentum' in x:
x['momentum'] = np.interp(ni, xi, [hyp['warmup_momentum'], hyp['momentum']])
# Multi-scale
if opt.multi_scale:
sz = random.randrange(imgsz * 0.5, imgsz * 1.5 + gs) // gs * gs # size
sf = sz / max(imgs.shape[2:]) # scale factor
if sf != 1:
ns = [math.ceil(x * sf / gs) * gs for x in imgs.shape[2:]] # new shape (stretched to gs-multiple)
imgs = F.interpolate(imgs, size=ns, mode='bilinear', align_corners=False)
# Forward
with amp.autocast(enabled=cuda):
pred = model(imgs) # forward
loss, loss_items = compute_loss(pred, targets.to(device), model) # loss scaled by batch_size
if rank != -1:
loss *= opt.world_size # gradient averaged between devices in DDP mode
# Backward
scaler.scale(loss).backward()
# Optimize
if ni % accumulate == 0:
scaler.step(optimizer) # optimizer.step
scaler.update()
optimizer.zero_grad()
if ema:
ema.update(model)
# Print
if rank in [-1, 0]:
mloss = (mloss * i + loss_items) / (i + 1) # update mean losses
mem = '%.3gG' % (torch.cuda.memory_reserved() / 1E9 if torch.cuda.is_available() else 0) # (GB)
s = ('%10s' * 2 + '%10.4g' * 6) % (
'%g/%g' % (epoch, epochs - 1), mem, *mloss, targets.shape[0], imgs.shape[-1])
pbar.set_description(s)
# Plot
if plots and ni < 3:
f = save_dir / f'train_batch{ni}.jpg' # filename
Thread(target=plot_images, args=(imgs, targets, paths, f), daemon=True).start()
# if tb_writer:
# tb_writer.add_image(f, result, dataformats='HWC', global_step=epoch)
# tb_writer.add_graph(model, imgs) # add model to tensorboard
elif plots and ni == 3 and wandb:
wandb.log({"Mosaics": [wandb.Image(str(x), caption=x.name) for x in save_dir.glob('train*.jpg')]})
# end batch ------------------------------------------------------------------------------------------------
# end epoch ----------------------------------------------------------------------------------------------------
# Scheduler
lr = [x['lr'] for x in optimizer.param_groups] # for tensorboard
scheduler.step()
# DDP process 0 or single-GPU
if rank in [-1, 0]:
# mAP
if ema:
ema.update_attr(model, include=['yaml', 'nc', 'hyp', 'gr', 'names', 'stride', 'class_weights'])
final_epoch = epoch + 1 == epochs
if not opt.notest or final_epoch: # Calculate mAP
results, maps, times = test.test(opt.data,
batch_size=total_batch_size,
imgsz=imgsz_test,
model=ema.ema,
single_cls=opt.single_cls,
dataloader=testloader,
save_dir=save_dir,
plots=plots and final_epoch,
log_imgs=opt.log_imgs if wandb else 0)
# Write
with open(results_file, 'a') as f:
f.write(s + '%10.4g' * 7 % results + '\n') # P, R, [email protected], [email protected], val_loss(box, obj, cls)
if len(opt.name) and opt.bucket:
os.system('gsutil cp %s gs://%s/results/results%s.txt' % (results_file, opt.bucket, opt.name))
# Log
tags = ['train/box_loss', 'train/obj_loss', 'train/cls_loss', # train loss
'metrics/precision', 'metrics/recall', 'metrics/mAP_0.5', 'metrics/mAP_0.5:0.95',
'val/box_loss', 'val/obj_loss', 'val/cls_loss', # val loss
'x/lr0', 'x/lr1', 'x/lr2'] # params
for x, tag in zip(list(mloss[:-1]) + list(results) + lr, tags):
if tb_writer:
tb_writer.add_scalar(tag, x, epoch) # tensorboard
if wandb:
wandb.log({tag: x}) # W&B
# Update best mAP
fi = fitness(np.array(results).reshape(1, -1)) # weighted combination of [P, R, [email protected], [email protected]]
if fi > best_fitness:
best_fitness = fi
# Save model
save = (not opt.nosave) or (final_epoch and not opt.evolve)
if save:
with open(results_file, 'r') as f: # create checkpoint
ckpt = {'epoch': epoch,
'best_fitness': best_fitness,
'training_results': f.read(),
'model': ema.ema,
'optimizer': None if final_epoch else optimizer.state_dict(),
'wandb_id': wandb_run.id if wandb else None}
# Save last, best and delete
torch.save(ckpt, last)
if best_fitness == fi:
torch.save(ckpt, best)
del ckpt
# end epoch ----------------------------------------------------------------------------------------------------
# end training
if rank in [-1, 0]:
# Strip optimizers
final = best if best.exists() else last # final model
for f in [last, best]:
if f.exists():
strip_optimizer(f) # strip optimizers
if opt.bucket:
os.system(f'gsutil cp {final} gs://{opt.bucket}/weights') # upload
# Plots
if plots:
plot_results(save_dir=save_dir) # save as results.png
if wandb:
files = ['results.png', 'precision_recall_curve.png', 'confusion_matrix.png']
wandb.log({"Results": [wandb.Image(str(save_dir / f), caption=f) for f in files
if (save_dir / f).exists()]})
if opt.log_artifacts:
wandb.log_artifact(artifact_or_path=str(final), type='model', name=save_dir.stem)
# Test best.pt
logger.info('%g epochs completed in %.3f hours.\n' % (epoch - start_epoch + 1, (time.time() - t0) / 3600))
if opt.data.endswith('coco.yaml') and nc == 80: # if COCO
for conf, iou, save_json in ([0.25, 0.45, False], [0.001, 0.65, True]): # speed, mAP tests
results, _, _ = test.test(opt.data,
batch_size=total_batch_size,
imgsz=imgsz_test,
conf_thres=conf,
iou_thres=iou,
model=attempt_load(final, device).half(),
single_cls=opt.single_cls,
dataloader=testloader,
save_dir=save_dir,
save_json=save_json,
plots=False)
else:
dist.destroy_process_group()
wandb.run.finish() if wandb and wandb.run else None
torch.cuda.empty_cache()
return results
def train(args):
# Set up logging and devices
log = util.get_logger(args.save_dir, args.name)
tbx = SummaryWriter(args.save_dir)
device, args.gpu_ids = util.get_available_devices()
log.info(f"Args: {dumps(vars(args), indent=4, sort_keys=True)}")
args.batch_size *= max(1, len(args.gpu_ids))
# Set random seed
log.info(f"Using random seed {args.seed}...")
random.seed(args.seed)
np.random.seed(args.seed)
torch.manual_seed(args.seed)
torch.cuda.manual_seed_all(args.seed)
# Get embeddings
log.info("Loading embeddings...")
word_vectors = util.torch_from_json(args.word_emb_file)
# Get model
log.info("Building model...")
model = BiDAF(
word_vectors=word_vectors,
hidden_size=args.hidden_size,
drop_prob=args.drop_prob,
use_glove=args.use_glove,
)
model = nn.DataParallel(model, args.gpu_ids)
if args.load_path:
log.info(f"Loading checkpoint from {args.load_path}...")
model, step = util.load_model(model, args.load_path, args.gpu_ids)
else:
step = 0
model = model.to(device)
model.train()
ema = stats.EMA(model, args.ema_decay)
# Get saver
saver = util.CheckpointSaver(
args.save_dir,
max_checkpoints=args.max_checkpoints,
metric_name=args.metric_name,
maximize_metric=args.maximize_metric,
log=log,
)
# Get optimizer and scheduler
optimizer = optim.Adam(model.parameters(),
args.lr,
weight_decay=args.l2_wd)
scheduler = sched.LambdaLR(optimizer, lambda s: 1.0) # Constant LR
# Get data loader
log.info("Building dataset...")
train_dataset = SQuAD(args.train_record_file, args.use_squad_v2)
train_loader = data.DataLoader(
train_dataset,
batch_size=args.batch_size,
shuffle=True,
num_workers=args.num_workers,
collate_fn=collate_fn,
)
dev_dataset = SQuAD(args.dev_record_file, args.use_squad_v2)
dev_loader = data.DataLoader(
dev_dataset,
batch_size=args.batch_size,
shuffle=False,
num_workers=args.num_workers,
collate_fn=collate_fn,
)
# Train
log.info("Training...")
steps_till_eval = args.eval_steps
epoch = step // len(train_dataset)
scaler = amp.GradScaler()
while epoch != args.num_epochs:
epoch += 1
log.info(f"Starting epoch {epoch}...")
with torch.enable_grad(), tqdm(
total=len(train_loader.dataset)) as progress_bar:
for cw_idxs, cc_idxs, qw_idxs, qc_idxs, y1, y2, ids in train_loader:
# Setup for forward
cw_idxs = cw_idxs.to(device)
qw_idxs = qw_idxs.to(device)
batch_size = cw_idxs.size(0)
optimizer.zero_grad()
# Forward
with amp.autocast():
log_p1, log_p2 = model(cw_idxs, qw_idxs)
y1, y2 = y1.to(device), y2.to(device)
loss = F.nll_loss(log_p1, y1) + F.nll_loss(log_p2, y2)
loss_val = loss.item()
# Backward
scaler.scale(loss).backward()
scaler.unscale_(optimizer)
nn.utils.clip_grad_norm_(model.parameters(),
args.max_grad_norm)
scaler.step(optimizer)
scaler.update()
scheduler.step(step // batch_size)
ema(model, step // batch_size)
# Log info
step += batch_size
progress_bar.update(batch_size)
progress_bar.set_postfix(epoch=epoch, NLL=loss_val)
tbx.add_scalar("train/NLL", loss_val, step)
tbx.add_scalar("train/LR", optimizer.param_groups[0]["lr"],
step)
steps_till_eval -= batch_size
if steps_till_eval <= 0:
steps_till_eval = args.eval_steps
# Evaluate and save checkpoint
log.info(f"Evaluating at step {step}...")
ema.assign(model)
results, pred_dict = evaluate(
model,
dev_loader,
device,
args.dev_eval_file,
args.max_ans_len,
args.use_squad_v2,
)
saver.save(step, model, results[args.metric_name], device)
ema.resume(model)
# Log to console
results_str = ", ".join(f"{k}: {v:05.2f}"
for k, v in results.items())
log.info(f"Dev {results_str}")
# Log to TensorBoard
log.info("Visualizing in TensorBoard...")
for k, v in results.items():
tbx.add_scalar(f"dev/{k}", v, step)
util.visualize(
tbx,
pred_dict=pred_dict,
eval_path=args.dev_eval_file,
step=step,
split="dev",
num_visuals=args.num_visuals,
)
