def _train(model, optimizer, lr_scheduler, forward_step, train_dataloader,
valid_dataloader, end_of_epoch_callback):
"""Train the model."""
args = get_args()
timers = get_timers()
# Turn on training mode which enables dropout.
model.train()
# Tracking loss.
losses_dict_sum = {}
# Starting epoch and iteration
start_epoch = args.iteration // args.train_iters_per_epoch
start_iteration = args.iteration % args.train_iters_per_epoch
iteration = args.iteration
# Memory reporting flag.
report_memory_flag = True
# For each remaining epoch
timers('interval time').start()
for epoch in range(start_epoch, args.epochs):
print_rank_0('working on epoch {} ...'.format(epoch + 1))
# Set the data loader epoch to shuffle the index iterator.
train_dataloader.sampler.set_epoch(args.seed + epoch)
# For all the batches in the dataset.
for iteration_, batch in enumerate(train_dataloader):
# Ignore the iterations before starting value
if iteration_ < start_iteration:
continue
# Set to zero so the next epoch does not skip any batches.
start_iteration = 0
# Train for one step.
losses_dict, _ = train_step(forward_step, batch, model, optimizer,
lr_scheduler)
iteration += 1
# Logging.
report_memory_flag = training_log(losses_dict, losses_dict_sum,
optimizer.param_groups[0]['lr'],
iteration, optimizer.loss_scale,
report_memory_flag)
# Autoresume
if args.adlr_autoresume and \
(iteration % args.adlr_autoresume_interval == 0):
check_adlr_autoresume_termination(iteration, model, optimizer,
lr_scheduler)
# Checkpointing
if args.save and args.save_interval and \
iteration % args.save_interval == 0:
save_checkpoint(iteration, model, optimizer, lr_scheduler)
# Evaluation
if args.eval_interval and iteration % args.eval_interval == 0:
prefix = 'iteration {}'.format(iteration)
evaluate_and_print_results(prefix, forward_step,
valid_dataloader, model, iteration,
False)
# Checkpointing at the end of each epoch.
if args.save:
save_checkpoint(iteration, model, optimizer, lr_scheduler)
# Callback at the end of each epoch.
if end_of_epoch_callback is not None:
end_of_epoch_callback(model, epoch)
def _train(model, optimizer, lr_scheduler, forward_step, train_dataloader,
valid_dataloader, end_of_epoch_callback):
"""Train the model."""
args = get_args()
timers = get_timers()
assert get_num_microbatches(
) == 1, "finetuning with gradient accumulation doesn't currently work"
# Turn on training mode which enables dropout.
for m in model:
m.train()
# Tracking loss.
losses_dict_sum = {}
# Starting epoch and iteration
start_epoch = args.iteration // args.train_iters_per_epoch
start_iteration = args.iteration % args.train_iters_per_epoch
iteration = args.iteration
# Memory reporting flag.
report_memory_flag = True
# For each remaining epoch
timers('interval-time').start()
for epoch in range(start_epoch, args.epochs):
print_rank_0('working on epoch {} ...'.format(epoch + 1))
# Set the data loader epoch to shuffle the index iterator.
train_dataloader.sampler.set_epoch(args.seed + epoch)
# For all the batches in the dataset.
for iteration_, batch in enumerate(train_dataloader):
# Ignore the iterations before starting value
if iteration_ < start_iteration:
continue
# Set to zero so the next epoch does not skip any batches.
start_iteration = 0
# Train for one step.
out = train_step(forward_step, batch, model, optimizer,
lr_scheduler)
losses_dict, skipped_iter, grad_norm, num_zeros_in_grad = out
iteration += 1
# Logging.
params_norm = None
if args.log_params_norm:
params_norm = calc_params_l2_norm(model)
report_memory_flag = training_log(
losses_dict, losses_dict_sum, optimizer.param_groups[0]['lr'],
iteration,
optimizer.get_loss_scale().item(), report_memory_flag,
skipped_iter, grad_norm, params_norm, num_zeros_in_grad)
# Autoresume
if args.adlr_autoresume and \
(iteration % args.adlr_autoresume_interval == 0):
check_adlr_autoresume_termination(iteration, model, optimizer,
lr_scheduler)
# Checkpointing
saved_checkpoint = False
if args.save and args.save_interval and \
iteration % args.save_interval == 0:
save_checkpoint(iteration, model, optimizer, lr_scheduler)
saved_checkpoint = True
# Evaluation
if args.eval_interval and iteration % args.eval_interval == 0:
prefix = 'iteration {}'.format(iteration)
evaluate_and_print_results(prefix, forward_step,
valid_dataloader, model, iteration,
False)
# Exiting based on iterations
if args.exit_interval and iteration % args.exit_interval == 0:
if not saved_checkpoint:
save_checkpoint(iteration, model, optimizer, lr_scheduler)
torch.distributed.barrier()
print_rank_0(
'exiting program at iteration {}'.format(iteration))
sys.exit()
# Checkpointing at the end of each epoch.
if args.save:
save_checkpoint(iteration, model, optimizer, lr_scheduler)
# Callback at the end of each epoch.
if end_of_epoch_callback is not None:
end_of_epoch_callback(model, epoch)
