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engine.py
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engine.py
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import math
import sys
from typing import Iterable
import torch
import util.misc as misc
import util.lr_sched as lr_sched
def train_one_epoch(model: torch.nn.Module,
data_loader: Iterable, optimizer: torch.optim.Optimizer,
device: torch.device, epoch: int, loss_scaler,
log_writer=None,
args=None):
model.train(True)
metric_logger = misc.MetricLogger(delimiter=" ")
metric_logger.add_meter('lr', misc.SmoothedValue(window_size=1, fmt='{value:.6f}'))
header = 'Epoch: [{}]'.format(epoch)
print_freq = 10
accum_iter = args.accum_iter
optimizer.zero_grad()
if log_writer is not None:
print('log_dir: {}'.format(log_writer.log_dir))
prefix_img = torch.tensor(data_loader.dataset.tokenizer.encode("Image: ", bos=False, eos=False), dtype=torch.int64)
prefix_nonimg = torch.tensor(data_loader.dataset.tokenizer.encode("Image: N/A", bos=False, eos=False),
dtype=torch.int64)
for data_iter_step, (examples, labels, example_mask, images, indicators) in enumerate(
metric_logger.log_every(data_loader, print_freq, header)):
# we use a per iteration (instead of per epoch) lr scheduler
if data_iter_step % accum_iter == 0:
lr_sched.adjust_learning_rate(optimizer, data_iter_step / len(data_loader) + epoch, args)
prefix_img = prefix_img.to(examples.device)
prefix_nonimg = prefix_nonimg.to(examples.device)
c_loss = model(examples, labels, images=images, prefix_img=prefix_img, prefix_nonimg=prefix_nonimg,
img_indicators=indicators)
if torch.isnan(c_loss):
print('nan')
c_loss = torch.nan_to_num(c_loss) * 0
loss = c_loss
loss_value = loss.item()
c_loss_value = c_loss.item()
loss = loss / accum_iter
loss_scaler(loss, optimizer, parameters=model.parameters(),
update_grad=(data_iter_step + 1) % accum_iter == 0, clip_grad=args.clip_grad)
if (data_iter_step + 1) % accum_iter == 0:
optimizer.zero_grad()
torch.cuda.synchronize()
metric_logger.update(closs=c_loss_value)
lr = optimizer.param_groups[0]["lr"]
metric_logger.update(lr=lr)
c_loss_value_reduce = misc.all_reduce_mean(c_loss_value)
if log_writer is not None and (data_iter_step + 1) % accum_iter == 0:
epoch_1000x = int((data_iter_step / len(data_loader) + epoch) * 1000)
log_writer.add_scalar('c_train_loss', c_loss_value_reduce, epoch_1000x)
log_writer.add_scalar('lr', lr, epoch_1000x)
metric_logger.synchronize_between_processes()
print("Averaged stats:", metric_logger)
return {k: meter.global_avg for k, meter in metric_logger.meters.items()}
def val_one_epoch(model: torch.nn.Module,
data_loader: Iterable, optimizer: torch.optim.Optimizer,
device: torch.device, epoch: int, loss_scaler,
log_writer=None,
args=None):
model.eval()
metric_logger = misc.MetricLogger(delimiter=" ")
metric_logger.add_meter('lr', misc.SmoothedValue(window_size=1, fmt='{value:.6f}'))
header = 'Epoch: [{}]'.format(epoch)
print_freq = 10
accum_iter = args.accum_iter
if log_writer is not None:
print('log_dir: {}'.format(log_writer.log_dir))
for data_iter_step, (examples, labels, example_mask) in enumerate(
metric_logger.log_every(data_loader, print_freq, header)):
with torch.no_grad():
c_loss = model(examples, labels)
loss = c_loss
loss_value = loss.item()
c_loss_value = c_loss.item()
if not math.isfinite(loss_value):
print("Loss is {}, stopping training".format(loss_value))
sys.exit(1)
metric_logger.update(closs=c_loss_value)
lr = optimizer.param_groups[0]["lr"]
metric_logger.update(lr=lr)
loss_value_reduce = misc.all_reduce_mean(loss_value)
c_loss_value_reduce = misc.all_reduce_mean(c_loss_value)
if log_writer is not None and (data_iter_step + 1) % accum_iter == 0:
""" We use epoch_1000x as the x-axis in tensorboard.
This calibrates different curves when batch size changes.
"""
epoch_1000x = int((data_iter_step / len(data_loader) + epoch) * 1000)
log_writer.add_scalar('c_train_loss', c_loss_value_reduce, epoch_1000x)
log_writer.add_scalar('lr', lr, epoch_1000x)
# gather the stats from all processes
metric_logger.synchronize_between_processes()
print("Averaged stats:", metric_logger)
return {k: meter.global_avg for k, meter in metric_logger.meters.items()}