def make_data_loader(dataset, batch_size, args):
shuffle = args.shuffle
if shuffle:
sampler = data_utils.samplers.RandomSampler(dataset,
replacement=True,
num_samples=batch_size *
args.train_iters)
else:
sampler = torch.utils.data.SequentialSampler(dataset)
world_size = torch.distributed.get_world_size(
group=mpu.get_data_parallel_group())
rank = torch.distributed.get_rank(group=mpu.get_data_parallel_group())
distributed = world_size > 1
drop_last = distributed
if distributed:
batch_sampler = data_utils.samplers.DistributedBatchSampler(
sampler, batch_size, drop_last, rank, world_size)
else:
batch_sampler = torch.utils.data.BatchSampler(sampler, batch_size,
drop_last)
data_loader = torch.utils.data.DataLoader(dataset,
batch_sampler=batch_sampler,
num_workers=args.num_workers,
pin_memory=True)
return data_loader
def allreduce_gradients(self):
"""Reduce gradients across data parallel ranks."""
# If we have buffers, simply reduce the data in the buffer.
if self._grad_buffers is not None:
for _, buffer_ in self._grad_buffers.items():
buffer_.data /= mpu.get_data_parallel_world_size()
torch.distributed.all_reduce(
buffer_.data, group=mpu.get_data_parallel_group())
else:
# Otherwise, bucketize and all-reduce
buckets = {}
# Pack the buckets.
for param in self.module.parameters():
if param.requires_grad and param.grad is not None:
tp = param.data.type()
if tp not in buckets:
buckets[tp] = []
buckets[tp].append(param)
param.main_grad = param.grad
# For each bucket, all-reduce and copy all-reduced grads.
for tp in buckets:
bucket = buckets[tp]
grads = [param.grad.data for param in bucket]
coalesced = _flatten_dense_tensors(grads)
coalesced /= mpu.get_data_parallel_world_size()
torch.distributed.all_reduce(
coalesced, group=mpu.get_data_parallel_group())
for buf, synced in zip(
grads, _unflatten_dense_tensors(coalesced, grads)):
buf.copy_(synced)
def average_losses_across_data_parallel_group(losses):
"""Reduce a tensor of losses across all GPUs."""
averaged_losses = torch.cat(
[loss.clone().detach().view(1) for loss in losses])
torch.distributed.all_reduce(averaged_losses,
group=mpu.get_data_parallel_group())
averaged_losses = averaged_losses / \
torch.distributed.get_world_size(group=mpu.get_data_parallel_group())
return averaged_losses
def get_group_world_size_rank():
group = mpu.get_data_parallel_group()
rank = torch.distributed.get_rank(group=group)
world_size = torch.distributed.get_world_size(group=group)
return group, rank, world_size
def calculate_correct_answers(model, dataloader, epoch):
"""Calculate correct over total answers"""
model.eval()
with torch.no_grad():
# For all the batches in the dataset.
total = 0
correct = 0
for _, batch in enumerate(dataloader):
# Run the model forward.
images, labels = process_batch(batch)
logits = model(images).contiguous().float()
# Add output predictions.
# Compute the correct answers.
predicted = torch.argmax(logits, dim=-1)
corrects = (predicted == labels).float()
# Add to the counters.
total += labels.size(0)
correct += corrects.sum().item()
model.train()
# Reduce.
unreduced = torch.cuda.LongTensor([correct, total])
torch.distributed.all_reduce(unreduced,
group=mpu.get_data_parallel_group())
# Print on screen.
correct_ans = unreduced[0].item()
total_count = unreduced[1].item()
return correct_ans, total_count
def get_model(model_provider_func):
"""Build the model."""
args = get_args()
# Build model on cpu.
model = model_provider_func()
if args.deepspeed:
# DeepSpeed handles CUDA, FP16, and DDP components.
return model
# GPU allocation.
model.cuda(torch.cuda.current_device())
# Fp16 conversion.
if args.fp16:
model = FP16_Module(model)
# Wrap model for distributed training."""
if args.DDP_impl == 'torch':
i = torch.cuda.current_device()
model = torchDDP(model,
device_ids=[i],
output_device=i,
process_group=mpu.get_data_parallel_group())
return model
if args.DDP_impl == 'local':
model = LocalDDP(model)
return model
raise NotImplementedError('Unknown DDP implementation specified: {}. '
'Exiting.'.format(args.DDP_impl))
def init_model_parallel(self, global_rank: int, world_size: int) -> None:
""" Initializes Megatron-LM model parallel if using model parallelism.
Args:
global_rank (int): the global process index.
world_size (int): the total number of GPUs, num_nodes * num_gpus
is_slurm_managing_tasks (bool, optional): is the cluster managed by SLURM.
"""
app_state = AppState()
# we initialize megatron-lm model parallel and data parallel groups
# after initializing DDP with PTL.
if app_state.model_parallel_size is not None:
if torch.distributed.is_initialized():
mpu.initialize_model_parallel(app_state.model_parallel_size)
app_state.model_parallel_group = mpu.get_model_parallel_group()
app_state.data_parallel_group = mpu.get_data_parallel_group()
app_state.model_parallel_rank = mpu.get_tensor_model_parallel_rank(
)
app_state.data_parallel_rank = mpu.get_data_parallel_rank()
app_state.data_parallel_size = mpu.get_data_parallel_world_size(
)
logging.info(f'mp_rank: {app_state.model_parallel_rank}')
logging.info(f'dp_rank: {app_state.data_parallel_rank}')
# TODO: get random seed from PTL
seed = os.environ.get("PL_GLOBAL_SEED", 1234)
# random seed must be set for megatron model parallel init
_set_random_seed(seed)
def get_model(model_provider_func):
"""Build the model."""
args = get_args()
# Build model on cpu.
model = model_provider_func()
# Print number of parameters.
if mpu.get_data_parallel_rank() == 0:
print(' > number of parameters on model parallel rank {}: {}'.format(
mpu.get_model_parallel_rank(),
sum([p.nelement() for p in model.parameters()])), flush=True)
# GPU allocation.
model.cuda(torch.cuda.current_device())
# Fp16 conversion.
if args.fp16:
model = FP16_Module(model)
# Wrap model for distributed training."""
if args.DDP_impl == 'torch':
i = torch.cuda.current_device()
model = torchDDP(model, device_ids=[i], output_device=i,
process_group=mpu.get_data_parallel_group())
return model
if args.DDP_impl == 'local':
model = LocalDDP(model)
return model
raise NotImplementedError('Unknown DDP implementation specified: {}. '
'Exiting.'.format(args.DDP_impl))
def init_ddp_connection(self,
global_rank: int,
world_size: int,
is_slurm_managing_tasks: bool = True) -> None:
""" Override for LightningModule DDP initialization.
Initializes Megatron-LM model parallel if using model parallelism.
Args:
global_rank (int): the global process index.
world_size (int): the total number of GPUs, num_nodes * num_gpus
is_slurm_managing_tasks (bool, optional): is the cluster managed by SLURM.
"""
LightningModule.init_ddp_connection(self, global_rank, world_size,
is_slurm_managing_tasks)
app_state = AppState()
# we initialize megatron-lm model parallel and data parallel groups
# after initializing DDP with PTL.
if app_state.model_parallel_size is not None:
if app_state.model_parallel_group is None:
mpu.initialize_model_parallel(app_state.model_parallel_size)
app_state.model_parallel_group = mpu.get_model_parallel_group()
app_state.data_parallel_group = mpu.get_data_parallel_group()
app_state.model_parallel_rank = torch.distributed.get_rank(
group=app_state.model_parallel_group)
app_state.data_parallel_rank = torch.distributed.get_rank(
group=app_state.data_parallel_group)
logging.info(f'mp_rank: {app_state.model_parallel_rank}')
logging.info(f'dp_rank: {app_state.data_parallel_rank}')
def get_gpt2_model(args_others, mp_size=1):
from megatron.model import GPT2Model
from megatron.initialize import initialize_megatron
args_defaults = {
'vocab_file': get_test_path('gpt2-vocab.json'),
'merge_file': get_test_path('gpt2-merges.txt'),
'tokenizer_type': 'GPT2BPETokenizer',
}
args_defaults.update(args_others)
# setting "make-vocab-size-divisible-by" to avoid word-embedding size change in resizing testing.
sys.argv.extend([
'--model-parallel-size',
str(mp_size), '--make-vocab-size-divisible-by',
str(1)
])
initialize_megatron(args_defaults=args_defaults, ignore_unknown_args=True)
model = GPT2Model(num_tokentypes=0, parallel_output=False)
model.cuda()
from torch.nn.parallel.distributed import DistributedDataParallel as torchDDP
from megatron import mpu
i = torch.cuda.current_device()
model = torchDDP(model,
device_ids=[i],
output_device=i,
process_group=mpu.get_data_parallel_group())
return model
def __init__(self, module):
from megatron import mpu
super().__init__(
module,
mp_group=mpu.get_model_parallel_group(),
dp_group=mpu.get_data_parallel_group(),
)
def __init__(self, module):
super(DistributedDataParallel, self).__init__()
self.warn_on_half = True if dist._backend == dist.dist_backend.GLOO else False
self.module = module
self.data_parallel_group = mpu.get_data_parallel_group()
def allreduce_params(reduce_after=True,
no_scale=False,
fp32_allreduce=False):
if (self.needs_reduction):
self.needs_reduction = False
buckets = {}
for name, param in self.module.named_parameters():
if param.requires_grad and param.grad is not None:
tp = (param.data.type())
if tp not in buckets:
buckets[tp] = []
buckets[tp].append(param)
if self.warn_on_half:
if torch.cuda.HalfTensor in buckets:
print(
"WARNING: gloo dist backend for half parameters may be extremely slow."
+
" It is recommended to use the NCCL backend in this case."
)
self.warn_on_half = False
for tp in buckets:
bucket = buckets[tp]
grads = [param.grad.data for param in bucket]
coalesced = _flatten_dense_tensors(grads)
if fp32_allreduce:
coalesced = coalesced.float()
if not no_scale and not reduce_after:
coalesced /= dist.get_world_size(
group=self.data_parallel_group)
dist.all_reduce(coalesced, group=self.data_parallel_group)
torch.cuda.synchronize()
if not no_scale and reduce_after:
coalesced /= dist.get_world_size(
group=self.data_parallel_group)
for buf, synced in zip(
grads, _unflatten_dense_tensors(coalesced, grads)):
buf.copy_(synced)
self.hook_handles = []
self.hooks = []
for param in list(self.module.parameters()):
def allreduce_hook(*unused):
Variable._execution_engine.queue_callback(allreduce_params)
# handle = param.register_hook(allreduce_hook)
# self.hooks.append(allreduce_hook)
# self.hook_handles.append(handle)
self.allreduce_params = allreduce_params
def model_provider():
"""Build the model."""
print_rank_0('building GPT2 model ...')
with deepspeed.zero.Init(data_parallel_group=mpu.get_data_parallel_group(),
remote_device=get_args().remote_device,
enabled=get_args().zero_stage == 3):
model = GPT2Model(num_tokentypes=0, parallel_output=True)
return model
def calculate_correct_answers(name, model, dataloader, epoch,
output_predictions):
"""Calculate correct over total answers and return prediction if the
`output_predictions` is true."""
start_time = time.time()
model.eval()
with torch.no_grad():
# For all the batches in the dataset.
total = 0
correct = 0
if output_predictions:
# This option is only possible when data parallel size is 1.
assert mpu.get_data_parallel_world_size() == 1
softmaxes = []
labels = []
ids = []
for _, batch in enumerate(dataloader):
# Run the model forward.
tokens, types, labels_, attention_mask = process_batch(batch)
logits = model(tokens, attention_mask, types)
# Add output predictions.
if output_predictions:
softmaxes.extend(
torch.nn.Softmax(dim=-1)(
logits.float()).data.cpu().numpy().tolist())
labels.extend(labels_.data.cpu().numpy().tolist())
ids.extend(batch['uid'].cpu().numpy().tolist())
# Compute the correct answers.
predicted = torch.argmax(logits, dim=-1)
corrects = (predicted == labels_)
# Add to the counters.
total += labels_.size(0)
correct += corrects.sum().item()
model.train()
# Reduce.
unreduced = torch.cuda.LongTensor([correct, total])
torch.distributed.all_reduce(unreduced,
group=mpu.get_data_parallel_group())
# Print on screen.
correct_ans = unreduced[0].item()
total_count = unreduced[1].item()
percent = float(correct_ans) * 100.0 / float(total_count)
elapsed_time = time.time() - start_time
print_rank_0(' > |epoch: {}| metrics for {}: correct / total '
'= {} / {} = {:.4f} %, elapsed time (sec): {:.3f}'.format(
epoch, name, correct_ans, total_count, percent,
elapsed_time))
if output_predictions:
return correct_ans, total_count, (softmaxes, labels, ids)
return correct_ans, total_count
def _dp_gather(self, logits):
"""
Gather logits from all data parallel ranks
"""
if logits is not None:
tensor_list = [torch.zeros_like(logits) for _ in range(self.dp_world_size)]
torch.distributed.all_gather(
tensor_list, logits, group=mpu.get_data_parallel_group()
)
logits = torch.cat(tensor_list, dim=0)
return logits
def __init__(self, model, forward_step_fn, neox_args, batch_size=None):
self.cache_hook = base.CacheHook(None)
self.model = model
self.neox_args = neox_args
self.tokenizer = neox_args.tokenizer
self._device = torch.device(f"cuda:{neox_args.local_rank}")
self._eot_token_id = neox_args.tokenizer.eod_id
self._max_length = neox_args.max_position_embeddings // 2
self._max_gen_toks = 128
self._vocab_size = neox_args.padded_vocab_size
# parallelism args:
self.is_main = neox_args.rank == 0
self.is_local_main = neox_args.local_rank == 0
self.is_model_parallel = neox_args.model_parallel_size > 1
self.is_pipe_parallel = self.model.is_pipe_parallel
self.is_data_parallel = self.model.is_data_parallel
self.is_last_stage = (
True if not self.is_pipe_parallel else model.is_last_stage()
) # only the last stage of the pipeline model will receive the logits
self.dp_world_size = mpu.get_data_parallel_world_size()
self.dp_rank = mpu.get_data_parallel_rank()
self.dp_group = mpu.get_data_parallel_group()
self.is_mp_rank_0 = mpu.get_model_parallel_rank() == 0
self._batch_size = batch_size or (
neox_args.batch_size * self.dp_world_size
) # default batch size to bs per gpu * dp size
# some utility functions:
# we need to patch tokenizer methods, because lm_eval uses them internally:
self.tokenizer.encode = self.tokenizer.tokenize
self.tokenizer.decode = self.tokenizer.detokenize
self._forward_step_fn = partial(
forward_step_fn, neox_args=neox_args, timers=None, return_logits=True
)
self.generate = partial(
generate_samples_from_prompt,
neox_args=neox_args,
model=model,
maximum_tokens=self._max_gen_toks,
temperature=0.0,
)
def get_model(model_provider_func):
"""Build the model."""
args = get_args()
# Build model on cpu.
model = model_provider_func()
# Set tensor model parallel attributes if not set.
# Only parameters that are already tensor model parallel have these
# attributes set for them. We should make sure the default attributes
# are set for all params so the optimizer can use them.
for param in model.parameters():
mpu.set_defaults_if_not_set_tensor_model_parallel_attributes(param)
# Print number of parameters.
if mpu.get_data_parallel_rank() == 0:
print(' > number of parameters on (tensor, pipeline) '
'model parallel rank ({}, {}): {}'.format(
mpu.get_tensor_model_parallel_rank(),
mpu.get_pipeline_model_parallel_rank(),
sum([p.nelement() for p in model.parameters()])),
flush=True)
# GPU allocation.
model.cuda(torch.cuda.current_device())
# Fp16 conversion.
if args.fp16:
model = FP16Module(model)
if args.DDP_impl == 'torch':
i = torch.cuda.current_device()
model = torchDDP(model,
device_ids=[i],
output_device=i,
process_group=mpu.get_data_parallel_group())
return model
if args.DDP_impl == 'local':
model = LocalDDP(model)
return model
raise NotImplementedError('Unknown DDP implementation specified: {}. '
'Exiting.'.format(args.DDP_impl))
def model_provider():
"""Build the model."""
print_rank_0('building GPT2 model ...')
see_memory_usage(f"Before Building Model", force=True)
with deepspeed.zero.Init(data_parallel_group=mpu.get_data_parallel_group(),
remote_device=get_args().remote_device,
deepspeed_config=get_args().deepspeed_config,
enabled=get_args().zero_stage == 3):
model = GPT2Model(num_tokentypes=0, parallel_output=True)
see_memory_usage(f"After Building Model", force=True)
if mpu.get_data_parallel_rank() == 0:
billion_params = get_parameters_in_billions(model)
print(
f' > number of parameters on model parallel rank {mpu.get_model_parallel_rank()}\
{round(billion_params, 3)} Billion',
flush=True)
return model
def evaluate(data_loader, model, eval_metric):
"""Evaluation."""
args = get_args()
# Turn on evaluation mode which disables dropout.
model.eval()
total_output = 0.0
with torch.no_grad():
# For all the batches in the dataset.
for iteration, batch in enumerate(data_loader):
if iteration % args.log_interval == 0:
print_rank_0('> working on iteration: {}'.format(iteration))
# Forward evaluation.
output = forward_step(batch, model, eval_metric)
# Reduce across processes.
torch.distributed.all_reduce(output,
group=mpu.get_data_parallel_group())
total_output += output
return total_output
def get_rng_state():
""" collect rng state across data parallel ranks """
args = get_args()
rng_state = {
'random_rng_state': random.getstate(),
'np_rng_state': np.random.get_state(),
'torch_rng_state': torch.get_rng_state(),
'cuda_rng_state': torch.cuda.get_rng_state(),
'rng_tracker_states': mpu.get_cuda_rng_tracker().get_states()
}
rng_state_list = None
if torch.distributed.is_initialized() and \
mpu.get_data_parallel_world_size() > 1 and \
args.data_parallel_random_init:
rng_state_list = \
[None for i in range(mpu.get_data_parallel_world_size())]
torch.distributed.all_gather_object(
rng_state_list, rng_state, group=mpu.get_data_parallel_group())
else:
rng_state_list = [rng_state]
return rng_state_list
def get_samples_mapping_(indexed_dataset,
data_prefix,
num_epochs,
max_num_samples,
max_seq_length,
short_seq_prob,
seed,
name):
if not num_epochs:
if not max_num_samples:
raise ValueError("Need to specify either max_num_samples "
"or num_epochs")
num_epochs = np.iinfo(np.int32).max - 1
if not max_num_samples:
max_num_samples = np.iinfo(np.int64).max - 1
# Filename of the index mapping
indexmap_filename = data_prefix
indexmap_filename += '_{}_indexmap'.format(name)
if num_epochs != (np.iinfo(np.int32).max - 1):
indexmap_filename += '_{}ep'.format(num_epochs)
if max_num_samples != (np.iinfo(np.int64).max - 1):
indexmap_filename += '_{}mns'.format(max_num_samples)
indexmap_filename += '_{}msl'.format(max_seq_length)
indexmap_filename += '_{:0.2f}ssp'.format(short_seq_prob)
indexmap_filename += '_{}s'.format(seed)
indexmap_filename += '.npy'
# Build the indexed mapping if not exist.
if torch.distributed.get_rank() == 0 and \
not os.path.isfile(indexmap_filename):
print(' > WARNING: could not find index map file {}, building '
'the indices on rank 0 ...'.format(indexmap_filename))
# Make sure the types match the helpers input types.
assert indexed_dataset.doc_idx.dtype == np.int64
assert indexed_dataset.sizes.dtype == np.int32
# Build samples mapping
verbose = torch.distributed.get_rank() == 0
start_time = time.time()
print_rank_0(' > building sapmles index mapping for {} ...'.format(
name))
# First compile and then import.
from megatron.data import helpers
samples_mapping = helpers.build_mapping(
indexed_dataset.doc_idx,
indexed_dataset.sizes,
num_epochs,
max_num_samples,
max_seq_length - 3, # account for added tokens
short_seq_prob,
seed,
verbose)
print_rank_0(' > done building sapmles index maping')
np.save(indexmap_filename, samples_mapping, allow_pickle=True)
print_rank_0(' > saved the index mapping in {}'.format(
indexmap_filename))
# Make sure all the ranks have built the mapping
print_rank_0(' > elasped time to build and save samples mapping '
'(seconds): {:4f}'.format(
time.time() - start_time))
# This should be a barrier but nccl barrier assumes
# device_index=rank which is not the case for model
# parallel case
counts = torch.cuda.LongTensor([1])
torch.distributed.all_reduce(counts, group=mpu.get_data_parallel_group())
torch.distributed.all_reduce(counts, group=mpu.get_pipeline_model_parallel_group())
assert counts[0].item() == (
torch.distributed.get_world_size() //
torch.distributed.get_world_size(group=mpu.get_tensor_model_parallel_group()))
# Load indexed dataset.
print_rank_0(' > loading indexed mapping from {}'.format(
indexmap_filename))
start_time = time.time()
samples_mapping = np.load(indexmap_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(' loaded indexed file in {:3.3f} seconds'.format(
time.time() - start_time))
print_rank_0(' total number of samples: {}'.format(
samples_mapping.shape[0]))
return samples_mapping
def calculate_correct_answers(name, model, dataloader, epoch,
output_predictions):
"""Calculate correct over total answers and return prediction if the
`output_predictions` is true."""
args = get_args()
forward_backward_func = get_forward_backward_func()
start_time = time.time()
for m in model:
m.eval()
saved_micro_batch_size = args.micro_batch_size
saved_global_batch_size = args.global_batch_size
ds = dataloader.dataset
if hasattr(ds, 'sample_multiplier'):
# If our dataset as a sample_multiplier attribute that means
# each "sample" from the dataset actually has multiple samples
# that will collapse into the batch dimension (for example in
# the RACE dataset that has several options), we need to
# account for that when setting the micro batch size.
sample_multiplier = ds.sample_multiplier
else:
sample_multiplier = 1
micro_batch_size_times_data_parallel = args.orig_micro_batch_size * args.data_parallel_size
num_micro_batches = args.orig_global_batch_size // micro_batch_size_times_data_parallel
def loss_func(output_predictions, labels, output_tensor):
logits = output_tensor
loss_dict = {}
# Add output predictions.
if output_predictions:
assert False
loss_dict['softmaxes'] = torch.nn.Softmax(dim=-1)(
logits.float()).data.cpu().numpy().tolist()
loss_dict['labels'] = labels.data.cpu().numpy().tolist()
loss_dict['ids'] = batch['uid'].cpu().numpy().tolist()
# Compute the correct answers.
predicted = torch.argmax(logits, dim=-1)
corrects = (predicted == labels)
# Add to the counters.
loss_dict['total'] = labels.size(0)
loss_dict['correct'] = corrects.sum().item()
return 0, loss_dict
# defined inside to capture output_predictions
def correct_answers_forward_step(batch, model):
try:
batch_ = next(batch)
except BaseException:
batch_ = batch
tokens, types, labels, attention_mask = process_batch(batch_)
# Forward model.
args = get_args()
output_tensor = model(tokens, attention_mask, tokentype_ids=types)
return output_tensor, partial(loss_func, output_predictions, labels)
with torch.no_grad():
# For all the batches in the dataset.
total = 0
correct = 0
if output_predictions:
# This option is only possible when data parallel size is 1.
assert mpu.get_data_parallel_world_size() == 1
softmaxes = []
labels = []
ids = []
for _, batch in enumerate(dataloader):
# For evaluation only mode we use drop_last = False to get all the
# samples, which means we might not have a full batch, so we
# adjust batch_size here to actual batch size of data
actual_batch_size = len(batch['label'])
# ... applying sample_multiplier if necessary
args.micro_batch_size = actual_batch_size * sample_multiplier
args.global_batch_size = actual_batch_size * sample_multiplier * num_micro_batches
loss_dicts = forward_backward_func(correct_answers_forward_step,
batch,
model,
optimizer=None,
timers=None,
forward_only=True)
for loss_dict in loss_dicts:
if output_predictions:
softmaxes.extend(loss_dict['softmaxes'])
labels.extend(loss_dict['labels'])
ids.extend(loss_dict['ids'])
total += loss_dict['total']
correct += loss_dict['correct']
for m in model:
m.train()
args.micro_batch_size = saved_micro_batch_size
args.global_batch_size = saved_global_batch_size
# Reduce.
if mpu.is_pipeline_last_stage():
unreduced = torch.cuda.LongTensor([correct, total])
torch.distributed.all_reduce(unreduced,
group=mpu.get_data_parallel_group())
# Print on screen.
correct_ans = unreduced[0].item()
total_count = unreduced[1].item()
percent = float(correct_ans) * 100.0 / float(total_count)
elapsed_time = time.time() - start_time
print_rank_last(
' > |epoch: {}| metrics for {}: correct / total '
'= {} / {} = {:.4f} %, elapsed time (sec): {:.3f}'.format(
epoch, name, correct_ans, total_count, percent, elapsed_time))
if output_predictions:
return correct_ans, total_count, (softmaxes, labels, ids)
return correct_ans, total_count
if output_predictions:
return 0, 0, ()
return 0, 0
def get_model(model_provider_func):
"""Build the model."""
args = get_args()
# Build model.
if mpu.get_pipeline_model_parallel_world_size() > 1 and \
args.virtual_pipeline_model_parallel_size is not None:
model = []
for i in range(args.virtual_pipeline_model_parallel_size):
mpu.set_virtual_pipeline_model_parallel_rank(i)
# Set pre_process and post_process only after virtual rank is set.
pre_process = mpu.is_pipeline_first_stage()
post_process = mpu.is_pipeline_last_stage()
this_model = model_provider_func(pre_process=pre_process,
post_process=post_process)
model.append(this_model)
else:
pre_process = mpu.is_pipeline_first_stage()
post_process = mpu.is_pipeline_last_stage()
model = model_provider_func(pre_process=pre_process,
post_process=post_process)
if not isinstance(model, list):
model = [model]
# Set tensor model parallel attributes if not set.
# Only parameters that are already tensor model parallel have these
# attributes set for them. We should make sure the default attributes
# are set for all params so the optimizer can use them.
for model_module in model:
for param in model_module.parameters():
mpu.set_defaults_if_not_set_tensor_model_parallel_attributes(param)
# Print number of parameters.
if mpu.get_data_parallel_rank() == 0:
print(' > number of parameters on (tensor, pipeline) '
'model parallel rank ({}, {}): {}'.format(
mpu.get_tensor_model_parallel_rank(),
mpu.get_pipeline_model_parallel_rank(),
sum([
sum([p.nelement() for p in model_module.parameters()])
for model_module in model
])),
flush=True)
# GPU allocation.
for model_module in model:
model_module.cuda(torch.cuda.current_device())
# Fp16 conversion.
if args.fp16 or args.bf16:
model = [Float16Module(model_module, args) for model_module in model]
if args.DDP_impl == 'torch':
i = torch.cuda.current_device()
model = [
torchDDP(model_module,
device_ids=[i],
output_device=i,
process_group=mpu.get_data_parallel_group())
for model_module in model
]
return model
if args.DDP_impl == 'local':
model = [
LocalDDP(model_module, args.accumulate_allreduce_grads_in_fp32,
args.use_contiguous_buffers_in_ddp)
for model_module in model
]
return model
raise NotImplementedError('Unknown DDP implementation specified: {}. '
'Exiting.'.format(args.DDP_impl))
def make_loaders(args):
"""makes training/val/test"""
if args.data_loader == 'tfrecords':
return make_tfrecord_loaders(args)
world_size = torch.distributed.get_world_size(
group=mpu.get_data_parallel_group())
batch_size = args.batch_size * world_size
eval_batch_size = batch_size
if args.eval_batch_size is not None:
eval_batch_size = args.eval_batch_size * world_size
seq_length = args.seq_length
if seq_length < 0:
seq_length = seq_length * world_size
eval_seq_length = args.eval_seq_length
if eval_seq_length is not None and eval_seq_length < 0:
eval_seq_length = eval_seq_length * world_size
split = get_split(args)
if args.data_path is not None:
args.train_data = args.data_path
data_set_args = {
'path': args.train_data,
'seq_length': seq_length,
'lazy': args.data_loader == 'lazy',
'delim': args.delim,
'text_key': args.text_key,
'label_key': 'label',
'non_binary_cols': None,
'ds_type': args.data_set_type,
'split': split,
'loose': args.loose_json,
'tokenizer_type': args.tokenizer_type,
'tokenizer_model_path': args.tokenizer_path,
'vocab_size': args.vocab_size,
'model_type': args.tokenizer_model_type,
'cache_dir': args.cache_dir,
'max_preds_per_seq': args.max_preds_per_seq,
'presplit_sentences': args.presplit_sentences,
'parallel_group': mpu.get_data_parallel_group()
}
eval_set_args = copy.copy(data_set_args)
eval_set_args['split'] = [1.]
# if optional eval args were set then replace their
# equivalent values in the arg dict
if eval_seq_length:
eval_set_args['seq_length'] = eval_seq_length
if args.eval_max_preds_per_seq:
eval_set_args['max_preds_per_seq'] = args.eval_max_preds_per_seq
if args.eval_text_key is not None:
eval_set_args['text_key'] = args.eval_text_key
# make datasets splits and tokenizer
train = None
valid = None
test = None
if args.train_data is not None:
train, tokenizer = data_utils.make_dataset(**data_set_args)
if data_utils.should_split(split):
train, valid, test = train
eval_set_args['tokenizer'] = tokenizer
# make training and val dataset if necessary
if valid is None and args.valid_data is not None:
eval_set_args['path'] = args.valid_data
valid, tokenizer = data_utils.make_dataset(**eval_set_args)
eval_set_args['tokenizer'] = tokenizer
if test is None and args.test_data is not None:
eval_set_args['path'] = args.test_data
test, tokenizer = data_utils.make_dataset(**eval_set_args)
# wrap datasets with data loader
if train is not None and args.batch_size > 0:
train = make_data_loader(train, batch_size, args)
args.do_train = True
else:
args.do_train = False
eval_batch_size = eval_batch_size if eval_batch_size != 0 else batch_size
if valid is not None:
valid = make_data_loader(valid, eval_batch_size, args)
args.do_valid = True
else:
args.do_valid = False
if test is not None:
test = make_data_loader(test, eval_batch_size, args)
args.do_test = True
else:
args.do_test = False
return (train, valid, test), tokenizer
def get_model(model_provider_func,
model_type=ModelType.encoder_or_decoder,
wrap_with_ddp=True):
"""Build the model."""
args = get_args()
args.model_type = model_type
# Build model.
if mpu.get_pipeline_model_parallel_world_size() > 1 and \
args.virtual_pipeline_model_parallel_size is not None:
assert model_type != ModelType.encoder_and_decoder, \
"Interleaved schedule not supported for model with both encoder and decoder"
model = []
for i in range(args.virtual_pipeline_model_parallel_size):
mpu.set_virtual_pipeline_model_parallel_rank(i)
# Set pre_process and post_process only after virtual rank is set.
pre_process = mpu.is_pipeline_first_stage()
post_process = mpu.is_pipeline_last_stage()
this_model = model_provider_func(pre_process=pre_process,
post_process=post_process)
this_model.model_type = model_type
model.append(this_model)
else:
pre_process = mpu.is_pipeline_first_stage()
post_process = mpu.is_pipeline_last_stage()
add_encoder = True
add_decoder = True
if model_type == ModelType.encoder_and_decoder:
if mpu.get_pipeline_model_parallel_world_size() > 1:
assert args.pipeline_model_parallel_split_rank is not None, \
"Split rank needs to be specified for model with both encoder and decoder"
rank = mpu.get_pipeline_model_parallel_rank()
split_rank = args.pipeline_model_parallel_split_rank
world_size = mpu.get_pipeline_model_parallel_world_size()
pre_process = rank == 0 or rank == split_rank
post_process = (rank == (split_rank -
1)) or (rank == (world_size - 1))
add_encoder = mpu.is_pipeline_stage_before_split()
add_decoder = mpu.is_pipeline_stage_after_split()
model = model_provider_func(pre_process=pre_process,
post_process=post_process,
add_encoder=add_encoder,
add_decoder=add_decoder)
else:
model = model_provider_func(pre_process=pre_process,
post_process=post_process)
model.model_type = model_type
if not isinstance(model, list):
model = [model]
# Set tensor model parallel attributes if not set.
# Only parameters that are already tensor model parallel have these
# attributes set for them. We should make sure the default attributes
# are set for all params so the optimizer can use them.
for model_module in model:
for param in model_module.parameters():
mpu.set_defaults_if_not_set_tensor_model_parallel_attributes(param)
# Print number of parameters.
if mpu.get_data_parallel_rank() == 0:
print(' > number of parameters on (tensor, pipeline) '
'model parallel rank ({}, {}): {}'.format(
mpu.get_tensor_model_parallel_rank(),
mpu.get_pipeline_model_parallel_rank(),
sum([
sum([p.nelement() for p in model_module.parameters()])
for model_module in model
])),
flush=True)
# GPU allocation.
for model_module in model:
model_module.cuda(torch.cuda.current_device())
# Fp16 conversion.
if args.fp16 or args.bf16:
model = [Float16Module(model_module, args) for model_module in model]
if wrap_with_ddp:
if args.DDP_impl == 'torch':
i = torch.cuda.current_device()
model = [
torchDDP(model_module,
device_ids=[i],
output_device=i,
process_group=mpu.get_data_parallel_group())
for model_module in model
]
elif args.DDP_impl == 'local':
model = [
LocalDDP(model_module, args.accumulate_allreduce_grads_in_fp32,
args.use_contiguous_buffers_in_local_ddp)
for model_module in model
]
# broad cast params from data parallel src rank to other data parallel ranks
if args.data_parallel_random_init:
for model_module in model:
model_module.broadcast_params()
else:
raise NotImplementedError('Unknown DDP implementation specified: '
'{}. Exiting.'.format(args.DDP_impl))
return model
def get_block_samples_mapping(block_dataset,
title_dataset,
data_prefix,
num_epochs,
max_num_samples,
max_seq_length,
seed,
name,
use_one_sent_docs=False):
"""Get samples mapping for a dataset over fixed size blocks. This function also requires
a dataset of the titles for the source documents since their lengths must be taken into account.
:return: samples_mapping (BlockSamplesMapping)
"""
if not num_epochs:
if not max_num_samples:
raise ValueError("Need to specify either max_num_samples "
"or num_epochs")
num_epochs = np.iinfo(np.int32).max - 1
if not max_num_samples:
max_num_samples = np.iinfo(np.int64).max - 1
# Filename of the index mapping
indexmap_filename = data_prefix
indexmap_filename += '_{}_indexmap'.format(name)
if num_epochs != (np.iinfo(np.int32).max - 1):
indexmap_filename += '_{}ep'.format(num_epochs)
if max_num_samples != (np.iinfo(np.int64).max - 1):
indexmap_filename += '_{}mns'.format(max_num_samples)
indexmap_filename += '_{}msl'.format(max_seq_length)
indexmap_filename += '_{}s'.format(seed)
if use_one_sent_docs:
indexmap_filename += '_1sentok'
indexmap_filename += '.npy'
# Build the indexed mapping if not exist.
if mpu.get_data_parallel_rank() == 0 and \
not os.path.isfile(indexmap_filename):
print(' > WARNING: could not find index map file {}, building '
'the indices on rank 0 ...'.format(indexmap_filename))
# Make sure the types match the helpers input types.
assert block_dataset.doc_idx.dtype == np.int64
assert block_dataset.sizes.dtype == np.int32
# Build samples mapping
verbose = torch.distributed.get_rank() == 0
start_time = time.time()
print_rank_0(
' > building samples index mapping for {} ...'.format(name))
from megatron.data import helpers
mapping_array = helpers.build_blocks_mapping(
block_dataset.doc_idx,
block_dataset.sizes,
title_dataset.sizes,
num_epochs,
max_num_samples,
max_seq_length - 3, # account for added tokens
seed,
verbose,
use_one_sent_docs)
print_rank_0(' > done building samples index mapping')
np.save(indexmap_filename, mapping_array, allow_pickle=True)
print_rank_0(
' > saved the index mapping in {}'.format(indexmap_filename))
# Make sure all the ranks have built the mapping
print_rank_0(' > elapsed time to build and save samples mapping '
'(seconds): {:4f}'.format(time.time() - start_time))
# This should be a barrier but nccl barrier assumes
# device_index=rank which is not the case for model
# parallel case
counts = torch.cuda.LongTensor([1])
torch.distributed.all_reduce(counts, group=mpu.get_data_parallel_group())
assert counts[0].item() == torch.distributed.get_world_size(
group=mpu.get_data_parallel_group())
# Load indexed dataset.
print_rank_0(
' > loading indexed mapping from {}'.format(indexmap_filename))
start_time = time.time()
mapping_array = np.load(indexmap_filename,
allow_pickle=True,
mmap_mode='r')
samples_mapping = BlockSamplesMapping(mapping_array)
print_rank_0(
' loaded indexed file in {:3.3f} seconds'.format(time.time() -
start_time))
print_rank_0(' total number of samples: {}'.format(
mapping_array.shape[0]))
return samples_mapping
def _build_index_mappings(name, data_prefix, documents, sizes,
num_samples, seq_length, seed):
"""Build doc-idx, sample-idx, and shuffle-idx.
doc-idx: is an array (ordered) of documents to be used in training.
sample-idx: is the start document index and document offset for each
training sample.
shuffle-idx: maps the sample index into a random index into sample-idx.
"""
# Number of tokens in each epoch and number of required epochs.
tokens_per_epoch = _num_tokens(documents, sizes)
num_epochs = _num_epochs(tokens_per_epoch, seq_length, num_samples)
# rng state
np_rng = np.random.RandomState(seed=seed)
# Filename of the index mappings.
_filename = data_prefix
_filename += '_{}_indexmap'.format(name)
_filename += '_{}ns'.format(num_samples)
_filename += '_{}sl'.format(seq_length)
_filename += '_{}s'.format(seed)
doc_idx_filename = _filename + '_doc_idx.npy'
sample_idx_filename = _filename + '_sample_idx.npy'
shuffle_idx_filename = _filename + '_shuffle_idx.npy'
# Build the indexed mapping if not exist.
if torch.distributed.get_rank() == 0:
if (not os.path.isfile(doc_idx_filename)) or \
(not os.path.isfile(sample_idx_filename)) or \
(not os.path.isfile(shuffle_idx_filename)):
print_rank_0(' > WARNING: could not find index map files, building '
'the indices on rank 0 ...')
# For the last epoch, decide whether include the entire epoch
# in the global shuffle or not.
# If we need only one epoch, then separating last epoch does
# not mean anything.
if num_epochs == 1:
separate_last_epoch = False
print(' > only one epoch required, setting '
'separate_last_epoch to False', flush=True)
else:
# Get the number of samples for the last epoch
num_samples_from_epochs_minus_one = (
(num_epochs - 1) * tokens_per_epoch - 1) // seq_length
last_epoch_num_samples = num_samples - \
num_samples_from_epochs_minus_one
assert last_epoch_num_samples >= 0, \
'last epoch number of samples should be non-negative.'
num_samples_per_epoch = (tokens_per_epoch - 1) // seq_length
assert last_epoch_num_samples < (num_samples_per_epoch + 1), \
'last epoch number of samples exceeded max value.'
# If we have less than 80% of the samples for the last epoch,
# seperate out the epoch and treat it differently.
# Note: the 80% number is just based on common sense and can
# be adjusted if needed.
separate_last_epoch = (last_epoch_num_samples <
int(0.80 * num_samples_per_epoch))
if separate_last_epoch:
string = ' > last epoch number of samples ({}) is smaller '\
'than 80% of number of samples per epoch ({}), '\
'setting separate_last_epoch to True'
else:
string = ' > last epoch number of samples ({}) is larger '\
'than 80% of number of samples per epoch ({}), '\
'setting separate_last_epoch to False'
print(string.format(last_epoch_num_samples,
num_samples_per_epoch), flush=True)
# doc-idx.
start_time = time.time()
doc_idx = _build_doc_idx(documents, num_epochs, np_rng,
separate_last_epoch)
np.save(doc_idx_filename, doc_idx, allow_pickle=True)
print_rank_0(' > elasped time to build and save doc-idx mapping '
'(seconds): {:4f}'.format(time.time() - start_time))
# sample-idx.
start_time = time.time()
# Use C++ implementation for speed.
# First compile and then import.
from megatron.data import helpers
assert doc_idx.dtype == np.int32
assert sizes.dtype == np.int32
sample_idx = helpers.build_sample_idx(sizes, doc_idx, seq_length,
num_epochs, tokens_per_epoch)
# sample_idx = _build_sample_idx(sizes, doc_idx, seq_length,
# num_epochs, tokens_per_epoch)
np.save(sample_idx_filename, sample_idx, allow_pickle=True)
print_rank_0(' > elasped time to build and save sample-idx mapping '
'(seconds): {:4f}'.format(time.time() - start_time))
# shuffle-idx.
start_time = time.time()
# -1 is due to data structure used to retieve the index:
# sample i --> [sample_idx[i], sample_idx[i+1])
if separate_last_epoch:
num_samples_ = num_samples_from_epochs_minus_one
else:
num_samples_ = sample_idx.shape[0] - 1
shuffle_idx = _build_shuffle_idx(num_samples_,
sample_idx.shape[0] - 1, np_rng)
np.save(shuffle_idx_filename, shuffle_idx, allow_pickle=True)
print_rank_0(' > elasped time to build and save shuffle-idx mapping'
' (seconds): {:4f}'.format(time.time() - start_time))
# This should be a barrier but nccl barrier assumes
# device_index=rank which is not the case for model
# parallel case
counts = torch.cuda.LongTensor([1])
torch.distributed.all_reduce(counts, group=mpu.get_data_parallel_group())
torch.distributed.all_reduce(counts, group=mpu.get_pipeline_model_parallel_group())
assert counts[0].item() == (
torch.distributed.get_world_size() //
torch.distributed.get_world_size(group=mpu.get_tensor_model_parallel_group()))
# Load mappings.
start_time = time.time()
print_rank_0(' > loading doc-idx mapping from {}'.format(
doc_idx_filename))
doc_idx = np.load(doc_idx_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(' > loading sample-idx mapping from {}'.format(
sample_idx_filename))
sample_idx = np.load(sample_idx_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(' > loading shuffle-idx mapping from {}'.format(
shuffle_idx_filename))
shuffle_idx = np.load(shuffle_idx_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(' loaded indexed file in {:3.3f} seconds'.format(
time.time() - start_time))
print_rank_0(' total number of samples: {}'.format(
sample_idx.shape[0]))
print_rank_0(' total number of epochs: {}'.format(num_epochs))
return doc_idx, sample_idx, shuffle_idx
def _build_index_mappings(name, data_prefix, documents, sizes, num_samples,
seq_length, seed):
"""Build doc-idx, sample-idx, and shuffle-idx.
doc-idx: is an array (ordered) of documents to be used in training.
sample-idx: is the start document index and document offset for each
training sample.
shuffle-idx: maps the sample index into a random index into sample-idx.
"""
# Number of tokens in each epoch and number of required epochs.
tokens_per_epoch = _num_tokens(documents, sizes)
num_epochs = _num_epochs(tokens_per_epoch, seq_length, num_samples)
# rng state
np_rng = np.random.RandomState(seed=seed)
# Filename of the index mappings.
_filename = data_prefix
_filename += '_{}_indexmap'.format(name)
_filename += '_{}ns'.format(num_samples)
_filename += '_{}sl'.format(seq_length)
_filename += '_{}s'.format(seed)
doc_idx_filename = _filename + '_doc_idx.npy'
sample_idx_filename = _filename + '_sample_idx.npy'
shuffle_idx_filename = _filename + '_shuffle_idx.npy'
# Build the indexed mapping if not exist.
if torch.distributed.get_rank() == 0:
if (not os.path.isfile(doc_idx_filename)) or \
(not os.path.isfile(sample_idx_filename)) or \
(not os.path.isfile(shuffle_idx_filename)):
print_rank_0(
' > WARNING: could not find index map files, building '
'the indices on rank 0 ...')
# doc-idx.
start_time = time.time()
doc_idx = _build_doc_idx(documents, num_epochs, np_rng)
np.save(doc_idx_filename, doc_idx, allow_pickle=True)
print_rank_0(' > elasped time to build and save doc-idx mapping '
'(seconds): {:4f}'.format(time.time() - start_time))
# sample-idx.
start_time = time.time()
# Use C++ implementation for speed.
# First compile and then import.
from megatron.data.dataset_utils import compile_helper
compile_helper()
from megatron.data import helpers
assert doc_idx.dtype == np.int32
assert sizes.dtype == np.int32
sample_idx = helpers.build_sample_idx(sizes, doc_idx, seq_length,
num_epochs, tokens_per_epoch)
# sample_idx = _build_sample_idx(sizes, doc_idx, seq_length,
# num_epochs, tokens_per_epoch)
np.save(sample_idx_filename, sample_idx, allow_pickle=True)
print_rank_0(
' > elasped time to build and save sample-idx mapping '
'(seconds): {:4f}'.format(time.time() - start_time))
# shuffle-idx.
start_time = time.time()
# -1 is due to data structure used to retieve the index:
# sample i --> [sample_idx[i], sample_idx[i+1])
shuffle_idx = _build_shuffle_idx(sample_idx.shape[0] - 1, np_rng)
np.save(shuffle_idx_filename, shuffle_idx, allow_pickle=True)
print_rank_0(
' > elasped time to build and save shuffle-idx mapping'
' (seconds): {:4f}'.format(time.time() - start_time))
# This should be a barrier but nccl barrier assumes
# device_index=rank which is not the case for model
# parallel case
counts = torch.cuda.LongTensor([1])
torch.distributed.all_reduce(counts, group=mpu.get_data_parallel_group())
assert counts[0].item() == torch.distributed.get_world_size(
group=mpu.get_data_parallel_group())
# Load mappings.
start_time = time.time()
print_rank_0(' > loading doc-idx mapping from {}'.format(doc_idx_filename))
doc_idx = np.load(doc_idx_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(
' > loading sample-idx mapping from {}'.format(sample_idx_filename))
sample_idx = np.load(sample_idx_filename, allow_pickle=True, mmap_mode='r')
print_rank_0(
' > loading shuffle-idx mapping from {}'.format(shuffle_idx_filename))
shuffle_idx = np.load(shuffle_idx_filename,
allow_pickle=True,
mmap_mode='r')
print_rank_0(
' loaded indexed file in {:3.3f} seconds'.format(time.time() -
start_time))
print_rank_0(' total number of samples: {}'.format(sample_idx.shape[0]))
print_rank_0(' total number of epochs: {}'.format(num_epochs))
return doc_idx, sample_idx, shuffle_idx
def calculate_correct_answers(name, model, dataloader,
epoch, output_predictions):
"""Calculate correct over total answers and return prediction if the
`output_predictions` is true."""
args = get_args()
start_time = time.time()
model.eval()
saved_batch_size = args.micro_batch_size
with torch.no_grad():
# For all the batches in the dataset.
total = 0
correct = 0
if output_predictions:
# This option is only possible when data parallel size is 1.
assert mpu.get_data_parallel_world_size() == 1
softmaxes = []
labels = []
ids = []
for _, batch in enumerate(dataloader):
# Run the model forward.
tokens, types, labels_, attention_mask = process_batch(batch)
# For evaluation only mode we use drop_last = False to get all the
# samples, which means we might not have a full batch, so we
# adjust batch_size here to actual batch size of data
actual_batch_size = len(labels_)
# ... applying sample_multiplier if necessary
ds = dataloader.dataset
if hasattr(ds, 'sample_multiplier'):
actual_batch_size *= ds.sample_multiplier
args.micro_batch_size = actual_batch_size
if not mpu.is_pipeline_first_stage():
input_tensor, _ = communicate(
tensor_send_next=None,
tensor_send_prev=None,
recv_forward=True,
recv_backward=False)
else:
input_tensor = None
# Forward model.
if mpu.is_pipeline_first_stage():
assert input_tensor is None
output_tensor = model(tokens, attention_mask, tokentype_ids=types)
else:
assert input_tensor is not None
output_tensor = model(input_tensor, attention_mask)
if mpu.is_pipeline_last_stage():
logits = output_tensor
# Add output predictions.
if output_predictions:
softmaxes.extend(torch.nn.Softmax(dim=-1)(
logits.float()).data.cpu().numpy().tolist())
labels.extend(labels_.data.cpu().numpy().tolist())
ids.extend(batch['uid'].cpu().numpy().tolist())
# Compute the correct answers.
predicted = torch.argmax(logits, dim=-1)
corrects = (predicted == labels_)
# Add to the counters.
total += labels_.size(0)
correct += corrects.sum().item()
else:
communicate(
tensor_send_next=output_tensor,
tensor_send_prev=None,
recv_forward=False,
recv_backward=False)
model.train()
args.micro_batch_size = saved_batch_size
# Reduce.
if mpu.is_pipeline_last_stage():
unreduced = torch.cuda.LongTensor([correct, total])
torch.distributed.all_reduce(unreduced,
group=mpu.get_data_parallel_group())
# Print on screen.
correct_ans = unreduced[0].item()
total_count = unreduced[1].item()
percent = float(correct_ans) * 100.0 / float(total_count)
elapsed_time = time.time() - start_time
print_rank_last(' > |epoch: {}| metrics for {}: correct / total '
'= {} / {} = {:.4f} %, elapsed time (sec): {:.3f}'.format(
epoch, name, correct_ans, total_count,
percent, elapsed_time))
if output_predictions:
return correct_ans, total_count, (softmaxes, labels, ids)
return correct_ans, total_count
if output_predictions:
return 0, 0, ()
return 0, 0
def calculate_correct_answers(model, dataloader, epoch):
"""Calculate correct over total answers"""
args = get_args()
forward_backward_func = get_forward_backward_func()
for m in model:
m.eval()
def loss_func(labels, output_tensor):
logits = output_tensor
loss_dict = {}
# Compute the correct answers.
predicted = torch.argmax(logits, dim=-1)
corrects = (predicted == labels).float()
# Add to the counters.
loss_dict['total'] = labels.size(0)
loss_dict['correct'] = corrects.sum().item()
return 0, loss_dict
#defined inside to capture output_predictions
def correct_answers_forward_step(batch, model):
try:
batch_ = next(batch)
except BaseException:
batch_ = batch
images, labels = process_batch(batch_)
# Forward model.
args = get_args()
output_tensor = model(images)
return output_tensor, partial(loss_func, labels)
with torch.no_grad():
# For all the batches in the dataset.
total = 0
correct = 0
for _, batch in enumerate(dataloader):
loss_dicts = forward_backward_func(correct_answers_forward_step,
batch,
model,
optimizer=None,
timers=None,
forward_only=True)
for loss_dict in loss_dicts:
total += loss_dict['total']
correct += loss_dict['correct']
for m in model:
m.train()
# Reduce.
if mpu.is_pipeline_last_stage():
unreduced = torch.cuda.LongTensor([correct, total])
torch.distributed.all_reduce(unreduced,
group=mpu.get_data_parallel_group())
# Print on screen.
correct_ans = unreduced[0].item()
total_count = unreduced[1].item()
return correct_ans, total_count
