def train(net, train_data, val_data, eval_metric, batch_size, ctx, args):
"""Training pipeline"""
kv = mx.kvstore.create(args.kv_store)
net.collect_params().setattr('grad_req', 'null')
net.collect_train_params().setattr('grad_req', 'write')
for k, v in net.collect_params('.*bias').items():
v.wd_mult = 0.0
optimizer_params = {'learning_rate': args.lr, 'wd': args.wd, 'momentum': args.momentum}
if args.horovod:
hvd.broadcast_parameters(net.collect_params(), root_rank=0)
trainer = hvd.DistributedTrainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
optimizer_params
)
else:
trainer = gluon.Trainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
optimizer_params,
update_on_kvstore=(False if args.amp else None), kvstore=kv)
if args.amp:
amp.init_trainer(trainer)
# lr decay policy
lr_decay = float(args.lr_decay)
lr_steps = sorted([float(ls) for ls in args.lr_decay_epoch.split(',') if ls.strip()])
lr_warmup = float(args.lr_warmup) # avoid int division
rpn_cls_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
rpn_box_loss = mx.gluon.loss.HuberLoss(rho=1 / 9.) # == smoothl1
rcnn_cls_loss = mx.gluon.loss.SoftmaxCrossEntropyLoss()
rcnn_box_loss = mx.gluon.loss.HuberLoss() # == smoothl1
rcnn_mask_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
metrics = [mx.metric.Loss('RPN_Conf'),
mx.metric.Loss('RPN_SmoothL1'),
mx.metric.Loss('RCNN_CrossEntropy'),
mx.metric.Loss('RCNN_SmoothL1'),
mx.metric.Loss('RCNN_Mask')]
rpn_acc_metric = RPNAccMetric()
rpn_bbox_metric = RPNL1LossMetric()
rcnn_acc_metric = RCNNAccMetric()
rcnn_bbox_metric = RCNNL1LossMetric()
rcnn_mask_metric = MaskAccMetric()
rcnn_fgmask_metric = MaskFGAccMetric()
metrics2 = [rpn_acc_metric, rpn_bbox_metric,
rcnn_acc_metric, rcnn_bbox_metric,
rcnn_mask_metric, rcnn_fgmask_metric]
# set up logger
logging.basicConfig()
logger = logging.getLogger()
logger.setLevel(logging.INFO)
log_file_path = args.save_prefix + '_train.log'
log_dir = os.path.dirname(log_file_path)
if log_dir and not os.path.exists(log_dir):
os.makedirs(log_dir)
fh = logging.FileHandler(log_file_path)
logger.addHandler(fh)
logger.info(args)
if args.verbose:
logger.info('Trainable parameters:')
logger.info(net.collect_train_params().keys())
logger.info('Start training from [Epoch {}]'.format(args.start_epoch))
best_map = [0]
for epoch in range(args.start_epoch, args.epochs):
if not args.disable_hybridization:
net.hybridize(static_alloc=args.static_alloc)
rcnn_task = ForwardBackwardTask(net, trainer, rpn_cls_loss, rpn_box_loss, rcnn_cls_loss,
rcnn_box_loss, rcnn_mask_loss)
executor = Parallel(args.executor_threads, rcnn_task) if not args.horovod else None
while lr_steps and epoch >= lr_steps[0]:
new_lr = trainer.learning_rate * lr_decay
lr_steps.pop(0)
trainer.set_learning_rate(new_lr)
logger.info("[Epoch {}] Set learning rate to {}".format(epoch, new_lr))
for metric in metrics:
metric.reset()
tic = time.time()
btic = time.time()
base_lr = trainer.learning_rate
for i, batch in enumerate(train_data):
if epoch == 0 and i <= lr_warmup:
# adjust based on real percentage
new_lr = base_lr * get_lr_at_iter(i / lr_warmup, args.lr_warmup_factor)
if new_lr != trainer.learning_rate:
if i % args.log_interval == 0:
logger.info(
'[Epoch 0 Iteration {}] Set learning rate to {}'.format(i, new_lr))
trainer.set_learning_rate(new_lr)
batch = split_and_load(batch, ctx_list=ctx)
metric_losses = [[] for _ in metrics]
add_losses = [[] for _ in metrics2]
# losses = []
if executor is not None:
for data in zip(*batch):
executor.put(data)
for j in range(len(ctx)):
if executor is not None:
result = executor.get()
else:
result = rcnn_task.forward_backward(list(zip(*batch))[0])
if (not args.horovod) or hvd.rank() == 0:
for k in range(len(metric_losses)):
metric_losses[k].append(result[k])
for k in range(len(add_losses)):
add_losses[k].append(result[len(metric_losses) + k])
for metric, record in zip(metrics, metric_losses):
metric.update(0, record)
for metric, records in zip(metrics2, add_losses):
for pred in records:
metric.update(pred[0], pred[1])
trainer.step(batch_size)
# update metrics
if (not args.horovod or hvd.rank() == 0) and args.log_interval \
and not (i + 1) % args.log_interval:
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics + metrics2])
logger.info('[Epoch {}][Batch {}], Speed: {:.3f} samples/sec, {}'.format(
epoch, i, args.log_interval * args.batch_size / (time.time() - btic), msg))
btic = time.time()
# validate and save params
if (not args.horovod) or hvd.rank() == 0:
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics])
logger.info('[Epoch {}] Training cost: {:.3f}, {}'.format(
epoch, (time.time() - tic), msg))
if not (epoch + 1) % args.val_interval:
# consider reduce the frequency of validation to save time
map_name, mean_ap = validate(net, val_data, ctx, eval_metric, args)
val_msg = '\n'.join(['{}={}'.format(k, v) for k, v in zip(map_name, mean_ap)])
logger.info('[Epoch {}] Validation: \n{}'.format(epoch, val_msg))
current_map = float(mean_ap[-1])
else:
current_map = 0.
save_params(net, logger, best_map, current_map, epoch, args.save_interval,
args.save_prefix)
def train(net, train_data, val_data, eval_metric, batch_size, ctx, logger, args):
"""Training pipeline"""
args.kv_store = 'device' if (args.amp and 'nccl' in args.kv_store) else args.kv_store
kv = mx.kvstore.create(args.kv_store)
net.collect_params().setattr('grad_req', 'null')
net.collect_train_params().setattr('grad_req', 'write')
for k, v in net.collect_params('.*bias').items():
v.wd_mult = 0.0
optimizer_params = {'learning_rate': args.lr, 'wd': args.wd, 'momentum': args.momentum, }
if args.clip_gradient > 0.0:
optimizer_params['clip_gradient'] = args.clip_gradient
if args.amp:
optimizer_params['multi_precision'] = True
if args.horovod:
hvd.broadcast_parameters(net.collect_params(), root_rank=0)
trainer = hvd.DistributedTrainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
optimizer_params
)
else:
trainer = gluon.Trainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
optimizer_params,
update_on_kvstore=(False if args.amp else None),
kvstore=kv)
if args.amp:
amp.init_trainer(trainer)
# lr decay policy
lr_decay = float(args.lr_decay)
lr_steps = sorted([float(ls) for ls in args.lr_decay_epoch.split(',') if ls.strip()])
lr_warmup = float(args.lr_warmup) # avoid int division
rpn_cls_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
rpn_box_loss = mx.gluon.loss.HuberLoss(rho=args.rpn_smoothl1_rho) # == smoothl1
rcnn_cls_loss = mx.gluon.loss.SoftmaxCrossEntropyLoss()
rcnn_box_loss = mx.gluon.loss.HuberLoss(rho=args.rcnn_smoothl1_rho) # == smoothl1
rcnn_mask_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
metrics = [mx.metric.Loss('RPN_Conf'),
mx.metric.Loss('RPN_SmoothL1'),
mx.metric.Loss('RCNN_CrossEntropy'),
mx.metric.Loss('RCNN_SmoothL1'),
mx.metric.Loss('RCNN_Mask')]
rpn_acc_metric = RPNAccMetric()
rpn_bbox_metric = RPNL1LossMetric()
rcnn_acc_metric = RCNNAccMetric()
rcnn_bbox_metric = RCNNL1LossMetric()
rcnn_mask_metric = MaskAccMetric()
rcnn_fgmask_metric = MaskFGAccMetric()
metrics2 = [rpn_acc_metric, rpn_bbox_metric,
rcnn_acc_metric, rcnn_bbox_metric,
rcnn_mask_metric, rcnn_fgmask_metric]
async_eval_processes = []
logger.info(args)
if args.verbose:
logger.info('Trainable parameters:')
logger.info(net.collect_train_params().keys())
logger.info('Start training from [Epoch {}]'.format(args.start_epoch))
best_map = [0]
base_lr = trainer.learning_rate
for epoch in range(args.start_epoch, args.epochs):
rcnn_task = ForwardBackwardTask(net, trainer, rpn_cls_loss, rpn_box_loss, rcnn_cls_loss,
rcnn_box_loss, rcnn_mask_loss, args.amp)
executor = Parallel(args.executor_threads, rcnn_task) if not args.horovod else None
if not args.disable_hybridization:
net.hybridize(static_alloc=args.static_alloc)
while lr_steps and epoch >= lr_steps[0]:
new_lr = trainer.learning_rate * lr_decay
lr_steps.pop(0)
trainer.set_learning_rate(new_lr)
logger.info("[Epoch {}] Set learning rate to {}".format(epoch, new_lr))
for metric in metrics:
metric.reset()
tic = time.time()
btic = time.time()
train_data_iter = iter(train_data)
next_data_batch = next(train_data_iter)
next_data_batch = split_and_load(next_data_batch, ctx_list=ctx)
for i in range(len(train_data)):
batch = next_data_batch
if i + epoch * len(train_data) <= lr_warmup:
# adjust based on real percentage
new_lr = base_lr * get_lr_at_iter((i + epoch * len(train_data)) / lr_warmup,
args.lr_warmup_factor)
if new_lr != trainer.learning_rate:
if i % args.log_interval == 0:
logger.info('[Epoch {} Iteration {}] Set learning rate to {}'
.format(epoch, i, new_lr))
trainer.set_learning_rate(new_lr)
metric_losses = [[] for _ in metrics]
add_losses = [[] for _ in metrics2]
if executor is not None:
for data in zip(*batch):
executor.put(data)
for j in range(len(ctx)):
if executor is not None:
result = executor.get()
else:
result = rcnn_task.forward_backward(list(zip(*batch))[0])
if (not args.horovod) or hvd.rank() == 0:
for k in range(len(metric_losses)):
metric_losses[k].append(result[k])
for k in range(len(add_losses)):
add_losses[k].append(result[len(metric_losses) + k])
try:
# prefetch next batch
next_data_batch = next(train_data_iter)
next_data_batch = split_and_load(next_data_batch, ctx_list=ctx)
except StopIteration:
pass
for metric, record in zip(metrics, metric_losses):
metric.update(0, record)
for metric, records in zip(metrics2, add_losses):
for pred in records:
metric.update(pred[0], pred[1])
trainer.step(batch_size)
if (not args.horovod or hvd.rank() == 0) and args.log_interval \
and not (i + 1) % args.log_interval:
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics + metrics2])
batch_speed = args.log_interval * args.batch_size / (time.time() - btic)
speed.append(batch_speed)
logger.info('[Epoch {}][Batch {}], Speed: {:.3f} samples/sec, {}'.format(
epoch, i, batch_speed, msg))
btic = time.time()
if speed:
avg_batch_speed = sum(speed) / len(speed)
# validate and save params
if (not args.horovod) or hvd.rank() == 0:
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics])
logger.info('[Epoch {}] Training cost: {:.3f}, Speed: {:.3f} samples/sec, {}'.format(
epoch, (time.time() - tic), avg_batch_speed, msg))
if not (epoch + 1) % args.val_interval:
# consider reduce the frequency of validation to save time
validate(net, val_data, async_eval_processes, ctx, eval_metric, logger, epoch, best_map,
args)
elif (not args.horovod) or hvd.rank() == 0:
current_map = 0.
save_params(net, logger, best_map, current_map, epoch, args.save_interval,
args.save_prefix)
for thread in async_eval_processes:
thread.join()
def train(net, train_data, val_data, eval_metric, ctx, args):
"""Training pipeline"""
net.collect_params().setattr('grad_req', 'null')
net.collect_train_params().setattr('grad_req', 'write')
for k, v in net.collect_params('.*beta|.*bias').items():
v.wd_mult = 0.0
if args.horovod:
hvd.broadcast_parameters(net.collect_params(), root_rank=0)
trainer = hvd.DistributedTrainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
{'learning_rate': args.lr, 'wd': args.wd, 'momentum': args.momentum})
else:
trainer = gluon.Trainer(
net.collect_train_params(), # fix batchnorm, fix first stage, etc...
'sgd',
{'learning_rate': args.lr, 'wd': args.wd, 'momentum': args.momentum},
update_on_kvstore=(False if args.amp else None))
if args.amp:
amp.init_trainer(trainer)
# lr decay policy
lr_decay = float(args.lr_decay)
lr_steps = sorted([float(ls) for ls in args.lr_decay_epoch.split(',') if ls.strip()])
lr_warmup = float(args.lr_warmup) # avoid int division
rpn_cls_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
rpn_box_loss = mx.gluon.loss.HuberLoss(rho=1 / 9.) # == smoothl1
rcnn_cls_loss = mx.gluon.loss.SoftmaxCrossEntropyLoss()
rcnn_box_loss = mx.gluon.loss.HuberLoss() # == smoothl1
rcnn_mask_loss = mx.gluon.loss.SigmoidBinaryCrossEntropyLoss(from_sigmoid=False)
metrics = [mx.metric.Loss('RPN_Conf'),
mx.metric.Loss('RPN_SmoothL1'),
mx.metric.Loss('RCNN_CrossEntropy'),
mx.metric.Loss('RCNN_SmoothL1'),
mx.metric.Loss('RCNN_Mask')]
rpn_acc_metric = RPNAccMetric()
rpn_bbox_metric = RPNL1LossMetric()
rcnn_acc_metric = RCNNAccMetric()
rcnn_bbox_metric = RCNNL1LossMetric()
rcnn_mask_metric = MaskAccMetric()
rcnn_fgmask_metric = MaskFGAccMetric()
metrics2 = [rpn_acc_metric, rpn_bbox_metric,
rcnn_acc_metric, rcnn_bbox_metric,
rcnn_mask_metric, rcnn_fgmask_metric]
# set up logger
logging.basicConfig()
logger = logging.getLogger()
logger.setLevel(logging.INFO)
log_file_path = args.save_prefix + '_train.log'
log_dir = os.path.dirname(log_file_path)
if log_dir and not os.path.exists(log_dir):
os.makedirs(log_dir)
fh = logging.FileHandler(log_file_path)
logger.addHandler(fh)
logger.info(args)
if args.verbose:
logger.info('Trainable parameters:')
logger.info(net.collect_train_params().keys())
logger.info('Start training from [Epoch {}]'.format(args.start_epoch))
best_map = [0]
for epoch in range(args.start_epoch, args.epochs):
while lr_steps and epoch >= lr_steps[0]:
new_lr = trainer.learning_rate * lr_decay
lr_steps.pop(0)
trainer.set_learning_rate(new_lr)
logger.info("[Epoch {}] Set learning rate to {}".format(epoch, new_lr))
for metric in metrics:
metric.reset()
tic = time.time()
btic = time.time()
if not args.disable_hybridization:
net.hybridize(static_alloc=args.static_alloc)
base_lr = trainer.learning_rate
for i, batch in enumerate(train_data):
if epoch == 0 and i <= lr_warmup:
# adjust based on real percentage
new_lr = base_lr * get_lr_at_iter(i / lr_warmup)
if new_lr != trainer.learning_rate:
if i % args.log_interval == 0:
logger.info(
'[Epoch 0 Iteration {}] Set learning rate to {}'.format(i, new_lr))
trainer.set_learning_rate(new_lr)
batch = split_and_load(batch, ctx_list=ctx)
batch_size = len(batch[0])
losses = []
metric_losses = [[] for _ in metrics]
add_losses = [[] for _ in metrics2]
with autograd.record():
for data, label, gt_mask, rpn_cls_targets, rpn_box_targets, rpn_box_masks in zip(
*batch):
gt_label = label[:, :, 4:5]
gt_box = label[:, :, :4]
cls_pred, box_pred, mask_pred, roi, samples, matches, rpn_score, rpn_box, anchors = net(
data, gt_box)
# losses of rpn
rpn_score = rpn_score.squeeze(axis=-1)
num_rpn_pos = (rpn_cls_targets >= 0).sum()
rpn_loss1 = rpn_cls_loss(rpn_score, rpn_cls_targets,
rpn_cls_targets >= 0) * rpn_cls_targets.size / num_rpn_pos
rpn_loss2 = rpn_box_loss(rpn_box, rpn_box_targets,
rpn_box_masks) * rpn_box.size / num_rpn_pos
# rpn overall loss, use sum rather than average
rpn_loss = rpn_loss1 + rpn_loss2
# generate targets for rcnn
cls_targets, box_targets, box_masks = net.target_generator(roi, samples,
matches, gt_label,
gt_box)
# losses of rcnn
num_rcnn_pos = (cls_targets >= 0).sum()
rcnn_loss1 = rcnn_cls_loss(cls_pred, cls_targets,
cls_targets >= 0) * cls_targets.size / \
cls_targets.shape[0] / num_rcnn_pos
rcnn_loss2 = rcnn_box_loss(box_pred, box_targets, box_masks) * box_pred.size / \
box_pred.shape[0] / num_rcnn_pos
rcnn_loss = rcnn_loss1 + rcnn_loss2
# generate targets for mask
mask_targets, mask_masks = net.mask_target(roi, gt_mask, matches, cls_targets)
# loss of mask
mask_loss = rcnn_mask_loss(mask_pred, mask_targets, mask_masks) * \
mask_targets.size / mask_targets.shape[0] / mask_masks.sum()
# overall losses
losses.append(rpn_loss.sum() + rcnn_loss.sum() + mask_loss.sum())
if (not args.horovod or hvd.rank() == 0):
metric_losses[0].append(rpn_loss1.sum())
metric_losses[1].append(rpn_loss2.sum())
metric_losses[2].append(rcnn_loss1.sum())
metric_losses[3].append(rcnn_loss2.sum())
metric_losses[4].append(mask_loss.sum())
add_losses[0].append([[rpn_cls_targets, rpn_cls_targets >= 0], [rpn_score]])
add_losses[1].append([[rpn_box_targets, rpn_box_masks], [rpn_box]])
add_losses[2].append([[cls_targets], [cls_pred]])
add_losses[3].append([[box_targets, box_masks], [box_pred]])
add_losses[4].append([[mask_targets, mask_masks], [mask_pred]])
add_losses[5].append([[mask_targets, mask_masks], [mask_pred]])
if args.amp:
with amp.scale_loss(losses, trainer) as scaled_losses:
autograd.backward(scaled_losses)
else:
autograd.backward(losses)
if (not args.horovod or hvd.rank() == 0):
for metric, record in zip(metrics, metric_losses):
metric.update(0, record)
for metric, records in zip(metrics2, add_losses):
for pred in records:
metric.update(pred[0], pred[1])
trainer.step(batch_size)
# update metrics
if (not args.horovod or hvd.rank() == 0) and args.log_interval and not (i + 1) % args.log_interval:
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics + metrics2])
logger.info('[Epoch {}][Batch {}], Speed: {:.3f} samples/sec, {}'.format(
epoch, i, args.log_interval * args.batch_size / (time.time() - btic), msg))
btic = time.time()
# validate and save params
if (not args.horovod or hvd.rank() == 0):
msg = ','.join(['{}={:.3f}'.format(*metric.get()) for metric in metrics])
logger.info('[Epoch {}] Training cost: {:.3f}, {}'.format(
epoch, (time.time() - tic), msg))
if not (epoch + 1) % args.val_interval:
# consider reduce the frequency of validation to save time
map_name, mean_ap = validate(net, val_data, ctx, eval_metric, args)
val_msg = '\n'.join(['{}={}'.format(k, v) for k, v in zip(map_name, mean_ap)])
logger.info('[Epoch {}] Validation: \n{}'.format(epoch, val_msg))
current_map = float(mean_ap[-1])
else:
current_map = 0.
save_params(net, logger, best_map, current_map, epoch, args.save_interval, args.save_prefix)