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():
parallel_state.initialize_model_parallel(
app_state.model_parallel_size)
app_state.model_parallel_group = parallel_state.get_tensor_model_parallel_group(
)
app_state.data_parallel_group = parallel_state.get_data_parallel_group(
)
app_state.model_parallel_rank = parallel_state.get_tensor_model_parallel_rank(
)
app_state.data_parallel_rank = parallel_state.get_data_parallel_rank(
)
app_state.data_parallel_size = parallel_state.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}')
def test_get_tensor_model_parallel_src_rank(tensor_model_parallel_size_):
if torch.distributed.get_rank() == 0:
print('> testing get_tensor_model_parallel_src_rank with size {} ...'.
format(tensor_model_parallel_size_))
tensor_model_parallel_size = min(
tensor_model_parallel_size_,
torch.distributed.get_world_size(),
)
assert not parallel_state.model_parallel_is_initialized()
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
assert parallel_state.model_parallel_is_initialized()
# Checks
src_rank = torch.distributed.get_rank(
) - parallel_state.get_tensor_model_parallel_rank()
assert parallel_state.get_tensor_model_parallel_src_rank() == src_rank
split_rank = parallel_state.get_pipeline_model_parallel_split_rank()
assert split_rank is None
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print('>> passed the test :-)')
def parallel_transformer(tensor_model_parallel_size, num_att_heads_per_partition,
hidden_size_per_att_head, batch_size, sequence_length):
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size()
seed = 12345
set_random_seed(seed)
num_att_heads = num_att_heads_per_partition * \
torch.distributed.get_world_size()
hidden_size = hidden_size_per_att_head * num_att_heads
intermediate_size = 4 * hidden_size
# Network
identity_layer = IdentityLayer3D(batch_size, sequence_length,
hidden_size).cuda()
transformer_layer = parallel_state.BertParallelTransformerLayer(
hidden_size, intermediate_size, num_att_heads, 0.0, 0.0,
torch.nn.functional.relu, 1.0e-5).cuda()
loss_weight = torch.randn([batch_size, sequence_length, hidden_size]).cuda()
attention_mask = torch.randn([batch_size, 1, 1, sequence_length]).cuda()
# Forward
input_ = identity_layer()
output = transformer_layer(input_, attention_mask)
loss = torch.mul(output, loss_weight).sum()
# Backward
loss.backward()
rank = parallel_state.get_tensor_model_parallel_rank()
parallel_state.destroy_model_parallel()
return rank, hidden_size, tensor_model_parallel_size, loss, \
transformer_layer, identity_layer
def parallel_self_attention(tensor_model_parallel_size,
num_att_heads_per_partition,
hidden_size_per_att_head, dropout_prob, batch_size,
sequence_length):
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
seed = 12345
set_random_seed(seed)
num_att_heads = num_att_heads_per_partition * \
torch.distributed.get_world_size()
hidden_size = hidden_size_per_att_head * num_att_heads
# Network
identity_layer = IdentityLayer3D(batch_size, sequence_length,
hidden_size).cuda()
attention_layer = parallel_state.BertParallelSelfAttention(
hidden_size, num_att_heads, dropout_prob).cuda()
loss_weight = torch.randn([batch_size, sequence_length,
hidden_size]).cuda()
attention_mask = torch.randn([batch_size, 1, 1, sequence_length]).cuda()
# Forward
input_ = identity_layer()
output = attention_layer(input_, attention_mask)
loss = torch.mul(output, loss_weight).sum()
# Backward
loss.backward()
rank = parallel_state.get_tensor_model_parallel_rank()
parallel_state.destroy_model_parallel()
return rank, hidden_size, tensor_model_parallel_size, loss, \
attention_layer, identity_layer
def test_model_parallel_cuda_manual_seed(tensor_model_parallel_size):
if torch.distributed.get_rank() == 0:
print('> testing model parallel cuda manual seed with size {} ...'.
format(tensor_model_parallel_size))
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
tensor_parallel.random.model_parallel_cuda_manual_seed(12345)
assert torch.cuda.initial_seed() == 12345
with tensor_parallel.random.get_cuda_rng_tracker().fork():
assert (torch.cuda.initial_seed() == 12345 + 2718 +
parallel_state.get_tensor_model_parallel_rank())
# Reset the tracker
tensor_parallel.random.get_cuda_rng_tracker().reset()
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print(TEST_SUCCESS_MESSAGE)
def test_cross_entropy(self):
batch_size, sequence_length, vocab_size_per_partition = 13, 17, 11
logits_scale = 1000.0
seed = 1234
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_parallel_world_size:
continue
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=
tensor_model_parallel_world_size, )
vocab_size = vocab_size_per_partition * tensor_model_parallel_world_size
loss_torch, grad_torch = torch_cross_entropy(
batch_size, sequence_length, vocab_size, logits_scale,
seed)
(
loss_tensor_parallel,
grad_tensor_parallel,
) = tensor_sharded_cross_entropy(batch_size, sequence_length,
vocab_size, logits_scale,
seed)
torch.testing.assert_close(loss_torch, loss_tensor_parallel)
torch.testing.assert_close(grad_torch, grad_tensor_parallel)
parallel_state.destroy_model_parallel()
def test_initialize_model_parallel_with_virtual_and_split(self) -> None:
if self.world_size < 4:
self.skipTest("requires >= 4 GPUs")
self.assertFalse(parallel_state.model_parallel_is_initialized())
tensor_model_parallel_world_size = 1 + int(self.world_size > 4)
pipeline_model_parallel_world_size = (self.world_size //
tensor_model_parallel_world_size)
virtual_pipeline_model_parallel_world_size = 2
pipeline_model_parallel_split_rank = pipeline_model_parallel_world_size // 2
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size,
pipeline_model_parallel_size_=pipeline_model_parallel_world_size,
virtual_pipeline_model_parallel_size_=
virtual_pipeline_model_parallel_world_size,
pipeline_model_parallel_split_rank_=
pipeline_model_parallel_split_rank,
)
self.assertEqual(
calc_expected_tensor_model_paralell_rank(
self.rank, tensor_model_parallel_world_size),
parallel_state.get_tensor_model_parallel_rank(),
)
self.assertEqual(
pipeline_model_parallel_world_size,
parallel_state.get_pipeline_model_parallel_world_size(),
)
self.assertEqual(
virtual_pipeline_model_parallel_world_size,
parallel_state.get_virtual_pipeline_model_parallel_world_size(),
)
expected_pipeline_rank = (self.rank -
(self.rank % tensor_model_parallel_world_size
)) % pipeline_model_parallel_world_size
self.assertEqual(
expected_pipeline_rank,
parallel_state.get_pipeline_model_parallel_rank(),
)
# virtual pipeline model parallel rank is lazily set, i.e., right after the call of
# `initialize_model_parallel`, it's set to 0.
self.assertEqual(
0,
parallel_state.get_virtual_pipeline_model_parallel_rank(),
)
self.assertEqual(
pipeline_model_parallel_split_rank,
parallel_state.get_pipeline_model_parallel_split_rank(),
)
fake_split_rank = 77
parallel_state.set_pipeline_model_parallel_split_rank(fake_split_rank)
self.assertEqual(
fake_split_rank,
parallel_state.get_pipeline_model_parallel_split_rank())
parallel_state.destroy_model_parallel()
def convert(local_rank, rank, world_size, args):
app_state = AppState()
app_state.data_parallel_rank = 0
num_nodes = world_size // args.gpus_per_node
if args.bcp:
trainer = Trainer(devices=args.gpus_per_node,
num_nodes=num_nodes,
accelerator='gpu',
plugins=[TorchElasticEnvironment()])
else:
trainer = Trainer(devices=args.gpus_per_node,
num_nodes=num_nodes,
accelerator='gpu')
app_state.pipeline_model_parallel_size = args.pipeline_model_parallel_size
app_state.tensor_model_parallel_size = args.tensor_model_parallel_size
app_state.model_parallel_size = app_state.tensor_model_parallel_size * app_state.pipeline_model_parallel_size
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=app_state.tensor_model_parallel_size,
pipeline_model_parallel_size_=app_state.pipeline_model_parallel_size,
)
app_state.pipeline_model_parallel_rank = parallel_state.get_pipeline_model_parallel_rank(
)
app_state.tensor_model_parallel_rank = parallel_state.get_tensor_model_parallel_rank(
)
# inject model parallel rank
checkpoint_path = inject_model_parallel_rank(
os.path.join(args.checkpoint_folder, args.checkpoint_name))
logging.info(
f'rank: {rank}, local_rank: {local_rank}, is loading checkpoint: {checkpoint_path} for tp_rank: {app_state.tensor_model_parallel_rank} and pp_rank: {app_state.pipeline_model_parallel_rank}'
)
if args.model_type == 'gpt':
model = MegatronGPTModel.load_from_checkpoint(
checkpoint_path, hparams_file=args.hparams_file, trainer=trainer)
elif args.model_type == 'bert':
model = MegatronBertModel.load_from_checkpoint(
checkpoint_path, hparams_file=args.hparams_file, trainer=trainer)
elif args.model_type == 't5':
model = MegatronT5Model.load_from_checkpoint(
checkpoint_path, hparams_file=args.hparams_file, trainer=trainer)
elif args.model_type == 'nmt':
model = MegatronNMTModel.load_from_checkpoint(
checkpoint_path, hparams_file=args.hparams_file, trainer=trainer)
model._save_restore_connector = NLPSaveRestoreConnector()
if torch.distributed.is_initialized():
torch.distributed.barrier()
model.save_to(args.nemo_file_path)
logging.info(f'NeMo model saved to: {args.nemo_file_path}')
def test__reduce(args, tensor_model_parallel_size):
print("Testing reduction size =", tensor_model_parallel_size)
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
assert torch.equal(
mappings._reduce(torch.full((10, 10, 10, 10), (50))),
torch.full((10, 10, 10, 10), 50 * tensor_model_parallel_size),
)
parallel_state.destroy_model_parallel()
print("Passed!")
def test_broadcast_data(tensor_model_parallel_size):
if torch.distributed.get_rank() == 0:
print(
'> testing broadcast_data with model parallel size {} ...'.format(
tensor_model_parallel_size))
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
torch.manual_seed(1234 + parallel_state.get_data_parallel_rank())
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
key_size_t = {
'key1': [7, 11],
'key2': [8, 2, 1],
'key3': [13],
'key4': [5, 1, 2],
'key5': [5, 12],
}
keys = list(key_size_t.keys())
data = {}
data_t = {}
for key in key_size_t:
data[key] = torch.LongTensor(size=key_size_t[key]).random_(0, 1000)
data_t[key] = data[key].clone()
data['keyX'] = torch.FloatTensor(size=(5, )).random_(0, 1000)
data_t['keyX'] = data['keyX'].clone()
if parallel_state.get_tensor_model_parallel_rank() != 0:
data = None
data_utils._check_data_types(keys, data_t, torch.int64)
key_size, key_numel, \
total_numel = data_utils._build_key_size_numel_dictionaries(keys, data)
for key in keys:
assert key_size[key] == key_size_t[key]
total_numel_t = 0
for key in keys:
target_size = functools.reduce(operator.mul, key_size_t[key], 1)
assert key_numel[key] == target_size
total_numel_t += target_size
assert total_numel == total_numel_t
data_b = data_utils.broadcast_data(keys, data, torch.int64)
for key in keys:
tensor = data_t[key].cuda()
assert data_b[key].sub(tensor).abs().max() == 0
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print(TEST_SUCCESS_MESSAGE)
def test_cuda_rng_tracker(self):
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_parallel_world_size:
continue
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size
)
seed_1, seed_2, size = 1234, 4321, [12, 21]
tensor = torch.cuda.FloatTensor(size)
torch.cuda.manual_seed(seed_1)
torch.randn(size, out=tensor)
target_11 = tensor.clone()
torch.randn(size, out=tensor)
target_12 = tensor.clone()
torch.cuda.manual_seed(seed_2)
torch.randn(size, out=tensor)
targt_21 = tensor.clone()
torch.randn(size, out=tensor)
target_22 = tensor.clone()
torch.cuda.manual_seed(seed_1)
tensor_parallel.random.get_cuda_rng_tracker().add(
"test", seed_2)
torch.randn(size, out=tensor)
result_11 = tensor.clone()
with tensor_parallel.random.get_cuda_rng_tracker().fork(
"test"):
torch.randn(size, out=tensor)
result_21 = tensor.clone()
torch.randn(size, out=tensor)
result_12 = tensor.clone()
with tensor_parallel.random.get_cuda_rng_tracker().fork(
"test"):
torch.randn(size, out=tensor)
result_22 = tensor.clone()
self.assertEqual(target_11, result_11)
self.assertEqual(target_12, result_12)
self.assertEqual(targt_21, result_21)
self.assertEqual(target_22, result_22)
self.assertNotEqual(result_11, result_21)
self.assertNotEqual(result_21, result_22)
tensor_parallel.random.get_cuda_rng_tracker().reset()
parallel_state.destroy_model_parallel()
def _test(self, rampup_batch_size: Optional[List[int]]) -> None:
for data_parallel_size in range(1, self.world_size + 1):
expected_global_batch_size = self.GLOBAL_BATCH_SIZE
expected_micro_batch_size = self.MICRO_BATCH_SIZE
if rampup_batch_size:
expected_global_batch_size = rampup_batch_size[0]
num_consumed_samples = 0
step_of_global_batch_size = rampup_batch_size[1]
threshold = rampup_batch_size[2]
if data_parallel_size > 1 and data_parallel_size % 2 != 0:
continue
if self.world_size % data_parallel_size != 0:
continue
with self.subTest(data_parallel_size=data_parallel_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=self.world_size //
data_parallel_size,
pipeline_model_parallel_size_=1,
)
self.assertEqual(data_parallel_size,
parallel_state.get_data_parallel_world_size())
_reconfigure_microbatch_calculator(
self.rank,
rampup_batch_size,
self.GLOBAL_BATCH_SIZE,
self.MICRO_BATCH_SIZE,
data_parallel_size,
)
self.assertEqual(get_micro_batch_size(),
expected_micro_batch_size)
self.assertEqual(
get_num_microbatches(), expected_global_batch_size /
expected_micro_batch_size / data_parallel_size)
current_global_batch_size = get_current_global_batch_size()
self.assertEqual(current_global_batch_size,
expected_global_batch_size)
# Make sure `global_batch_size` equals to the final global batch size after
# certain number of updates.
if rampup_batch_size:
update_num_microbatches(current_global_batch_size)
for i in range(100):
current_global_batch_size = get_current_global_batch_size(
)
update_num_microbatches(current_global_batch_size)
current_global_batch_size = get_current_global_batch_size()
self.assertEqual(get_current_global_batch_size(),
self.GLOBAL_BATCH_SIZE)
parallel_state.destroy_model_parallel()
def test_row_parallel_linear(self) -> None:
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_parallel_world_size:
continue
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size
)
input_size: int = self.INPUT_SIZE_COEFF * tensor_model_parallel_world_size
output_size: int = self.OUTPUT_SIZE_COEFF * tensor_model_parallel_world_size
set_random_seed(self.SEED)
linear_layer = layers.RowParallelLinear(
input_size,
output_size,
keep_master_weight_for_test=True,
params_dtype=torch.float32,
use_cpu_initialization=True,
).cuda()
loss_weight = torch.randn(
(self.BATCH_SIZE, output_size)).cuda()
# Forward and backward
input_tensor = torch.randn(self.BATCH_SIZE,
input_size,
requires_grad=True).cuda()
input_tensor.retain_grad()
output, _ = linear_layer(input_tensor)
loss = torch.mul(output, loss_weight).sum()
loss.backward()
self.assertIsNotNone(input_tensor.grad)
with torch.no_grad():
dldy = loss_weight.clone()
x = input_tensor.clone()
a = linear_layer.master_weight.cuda()
dlda = torch.matmul(dldy.t(), x)
dldb = torch.matmul(
torch.ones(self.BATCH_SIZE, 1).cuda().t(), dldy).view(-1)
dldx = torch.matmul(dldy, a)
with torch.no_grad():
curr_dlda = torch.split(
dlda, self.INPUT_SIZE_COEFF, dim=1
)[parallel_state.get_tensor_model_parallel_rank()].clone()
self.assertEqual(linear_layer.weight.grad, curr_dlda)
self.assertEqual(input_tensor.grad, dldx)
self.assertEqual(linear_layer.bias.grad, dldb)
parallel_state.destroy_model_parallel()
def test__gather(args, tensor_model_parallel_size):
print("Testing gathering size =", tensor_model_parallel_size)
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
assert torch.equal(
mappings._gather(
torch.tensor([parallel_state.get_tensor_model_parallel_rank()])),
torch.tensor(list(range(tensor_model_parallel_size))),
)
parallel_state.destroy_model_parallel()
print("Passed!")
def _affine_weight_init_test_impl(self, init_device: str,
is_column_parallel: bool) -> None:
dim = int(not is_column_parallel)
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_parallel_world_size:
continue
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size
)
input_size: int = self.INPUT_SIZE_COEFF * tensor_model_parallel_world_size
output_size: int = self.OUTPUT_SIZE_COEFF * tensor_model_parallel_world_size
weight_shape = ((self.OUTPUT_SIZE_COEFF,
input_size) if is_column_parallel else
(output_size, self.INPUT_SIZE_COEFF))
weight = torch.empty(weight_shape)
set_random_seed(self.SEED)
sharding_dim_size = (self.OUTPUT_SIZE_COEFF
if is_column_parallel else
self.INPUT_SIZE_COEFF)
if init_device == "cpu":
layers._initialize_affine_weight_cpu(
weight,
output_size,
input_size,
sharding_dim_size,
dim,
nn.init.normal_,
params_dtype=torch.float32,
)
else:
layers._initialize_affine_weight_gpu(
weight, torch.nn.init.normal_, dim)
# Target
set_random_seed(self.SEED)
if init_device == "cpu":
main_weight = torch.empty(output_size, input_size)
nn.init.normal_(main_weight)
curr_weight = torch.split(
main_weight, sharding_dim_size, dim=dim)[
parallel_state.get_tensor_model_parallel_rank()]
else:
curr_weight = torch.empty(*weight_shape)
nn.init.normal_(curr_weight)
self.assertEqual(curr_weight, weight)
parallel_state.destroy_model_parallel()
def test__split(args, tensor_model_parallel_size):
print("Testing splitting size =", tensor_model_parallel_size)
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
listy = []
for i in range(tensor_model_parallel_size):
listy.append(torch.randn(10, 1))
x = torch.cat(tuple(listy), 1)
out = mappings._split(x)
assert torch.equal(out,
listy[parallel_state.get_tensor_model_parallel_rank()])
parallel_state.destroy_model_parallel()
print("Passed!")
def test_column_parallel_linear_with_async_allreduce_custom_amp(
tensor_model_parallel_size):
dtypes = (torch.half,
torch.bfloat16) if torch.cuda.is_bf16_supported() else (
torch.half, )
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
seed = 12345
set_random_seed(seed)
input_size_coeff = 13
input_size = input_size_coeff * tensor_model_parallel_size
output_size_coeff = 17
output_size = output_size_coeff * tensor_model_parallel_size
batch_size = 7
for dtype in dtypes:
# Network
identity_layer = IdentityLayer3D(batch_size, batch_size,
input_size).to(device="cuda",
dtype=dtype)
linear_layer = layers.ColumnParallelLinear(
input_size,
output_size,
keep_master_weight_for_test=True,
params_dtype=global_vars.get_args().params_dtype,
use_cpu_initialization=global_vars.get_args().
use_cpu_initialization,
).to(device="cuda", dtype=dtype)
# Forward
loss_weight = torch.randn([batch_size, output_size]).cuda()
output, _ = linear_layer(identity_layer())
loss = torch.mul(output, loss_weight).sum()
loss.backward()
torch.distributed.barrier()
assert output.dtype == dtype
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print(' >> passed the test :-)')
def test_reduce(self):
for tensor_model_paralell_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_paralell_world_size > 0:
continue
with self.subTest(tensor_model_paralell_world_size=
tensor_model_paralell_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_paralell_world_size
)
t = torch.full((10, 10, 10, 10),
50,
device=f"cuda:{self.rank}")
expected = torch.full(
(10, 10, 10, 10),
50 * tensor_model_paralell_world_size,
device=f"cuda:{self.rank}",
)
self.assertTrue(torch.equal(mappings._reduce(t), expected))
parallel_state.destroy_model_parallel()
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_devices
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:
# destroy groups in case they have already been created
# this happens with multiple calls to trainer.test for example
parallel_state.destroy_model_parallel()
if torch.distributed.is_initialized():
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=app_state.
tensor_model_parallel_size,
pipeline_model_parallel_size_=app_state.
pipeline_model_parallel_size,
pipeline_model_parallel_split_rank_=app_state.
pipeline_model_parallel_split_rank,
)
# assert that fake tp and pp rank match after model parallel init
assert app_state.tensor_model_parallel_rank == parallel_state.get_tensor_model_parallel_rank(
)
assert app_state.pipeline_model_parallel_rank == parallel_state.get_pipeline_model_parallel_rank(
)
app_state.tensor_model_parallel_group = parallel_state.get_tensor_model_parallel_group(
)
app_state.data_parallel_group = parallel_state.get_data_parallel_group(
)
app_state.data_parallel_rank = parallel_state.get_data_parallel_rank(
)
app_state.data_parallel_size = parallel_state.get_data_parallel_world_size(
)
app_state.pipeline_model_parallel_group = parallel_state.get_pipeline_model_parallel_group(
)
def test_gather(self):
for tensor_model_paralell_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_paralell_world_size > 0:
continue
with self.subTest(tensor_model_paralell_world_size=
tensor_model_paralell_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_paralell_world_size
)
device = f"cuda:{self.rank}"
gathered = mappings._gather(
torch.tensor(
[parallel_state.get_tensor_model_parallel_rank()],
device=device))
expected = torch.tensor(
[rank for rank in range(tensor_model_paralell_world_size)],
device=device,
)
self.assertTrue(torch.equal(gathered, expected))
parallel_state.destroy_model_parallel()
def test_set_cuda_rng_state(self):
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_parallel_world_size:
continue
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size
)
size, seed = 123, 1234
torch.cuda.manual_seed(seed)
tensor = torch.cuda.FloatTensor(size)
rng_state = torch.cuda.get_rng_state()
rng_state_clone = rng_state.clone()
for _ in range(5):
torch.randn(size, out=tensor)
result_1 = tensor.clone()
self.assertEqual(rng_state.sub(rng_state_clone).max(), 0)
self.assertGreater(
torch.cuda.get_rng_state().sub(rng_state_clone).max(), 0)
new_rng_state = torch.cuda.get_rng_state()
self.assertGreater(new_rng_state.sub(rng_state).max(), 0)
tensor_parallel.random._set_cuda_rng_state(rng_state)
for _ in range(5):
torch.randn(size, out=tensor)
tensor_parallel.random._set_cuda_rng_state(rng_state)
for _ in range(5):
torch.randn(size, out=tensor)
result_2 = tensor.clone()
torch.testing.assert_close(result_2, result_1)
self.assertEqual(rng_state.sub(rng_state_clone).max(), 0)
parallel_state.destroy_model_parallel()
def test_initialize_model_parallel(self) -> None:
self.assertFalse(parallel_state.model_parallel_is_initialized())
for tensor_model_parallel_world_size in range(1, self.world_size + 1):
with self.subTest(tensor_model_parallel_world_size=
tensor_model_parallel_world_size):
if self.world_size % tensor_model_parallel_world_size:
continue
pipeline_model_parallel_world_size = (
self.world_size // tensor_model_parallel_world_size)
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=
tensor_model_parallel_world_size,
pipeline_model_parallel_size_=
pipeline_model_parallel_world_size,
)
self.assertEqual(
tensor_model_parallel_world_size,
parallel_state.get_tensor_model_parallel_world_size(),
)
expected_tensor_model_parallel_rank = calc_expected_tensor_model_paralell_rank(
self.rank, tensor_model_parallel_world_size)
self.assertEqual(
expected_tensor_model_parallel_rank,
parallel_state.get_tensor_model_parallel_rank(),
)
expected_tensor_model_parallel_src_rank = (
self.rank // tensor_model_parallel_world_size
) * tensor_model_parallel_world_size
self.assertEqual(
expected_tensor_model_parallel_src_rank,
parallel_state.get_tensor_model_parallel_src_rank(),
)
parallel_state.destroy_model_parallel()
self.assertFalse(
parallel_state.model_parallel_is_initialized())
def test_split(self):
for tensor_model_paralell_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_paralell_world_size > 0:
continue
with self.subTest(tensor_model_paralell_world_size=
tensor_model_paralell_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_paralell_world_size
)
tensors = [
torch.randn(10, 1)
for rank in range(tensor_model_paralell_world_size)
]
x = torch.cat(tensors, 1)
out = mappings._split(x)
self.assertTrue(
torch.equal(
out, tensors[
parallel_state.get_tensor_model_parallel_rank()]))
parallel_state.destroy_model_parallel()
def test_cross_entropy(tensor_model_parallel_size):
if torch.distributed.get_rank() == 0:
print('> testing cross entropy with model parallel size {} ...'.format(
tensor_model_parallel_size))
parallel_state.initialize_model_parallel(tensor_model_parallel_size)
tensor_model_parallel_size = parallel_state.get_tensor_model_parallel_world_size(
)
batch_size = 13
seq_length = 17
vocab_size_per_partition = 11
logits_scale = 1000.0
vocab_size = vocab_size_per_partition * tensor_model_parallel_size
seed = 1234
loss_torch, grad_torch = torch_cross_entropy(batch_size, seq_length,
vocab_size, logits_scale,
seed)
loss_mpu, grad_mpu = tensor_sharded_cross_entropy(batch_size, seq_length,
vocab_size, logits_scale,
seed)
error = loss_torch.sub_(loss_mpu).abs().max()
print(' max error in loss on global rank {}: {}'.format(
torch.distributed.get_rank(), error))
assert error < 1.0e-6
error = grad_torch.sub_(grad_mpu).abs().max()
print(' max error in grad on global rank {}: {}'.format(
torch.distributed.get_rank(), error))
assert error < 1.0e-6
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print(TEST_SUCCESS_MESSAGE)
def test_broadcast_data(self):
tensor_model_parallel_world_size: int = self.world_size // (
1 + self.world_size > 1)
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size)
target_key_size = {
"key1": [7, 11],
"key2": [8, 2, 1],
"key3": [13],
"key4": [5, 1, 2],
"key5": [5, 12],
}
keys = [k for k in target_key_size]
data = {}
data_t = {}
with torch.no_grad():
for key in target_key_size:
data[key] = torch.randint(0, 1000, size=target_key_size[key])
data_t[key] = data[key].clone()
# "key_x" is supposed to be ignored.
data["key_x"] = torch.rand(5)
data_t["key_x"] = data["key_x"].clone()
if parallel_state.get_tensor_model_parallel_rank() != 0:
data = None
data_utils._check_data_types(keys, data_t, torch.int64)
key_size, _, _ = data_utils._build_key_size_numel_dictionaries(
keys, data)
for key in keys:
self.assertEqual(target_key_size[key], key_size[key])
broadcasted_data = data_utils.broadcast_data(keys, data, torch.int64)
for key in keys:
torch.testing.assert_close(broadcasted_data[key],
data_t[key].cuda())
parallel_state.destroy_model_parallel()
def test_pipeline_model_parallel_split_rank():
pipeline_model_parallel_split_rank_ = 1
assert not parallel_state.model_parallel_is_initialized()
parallel_state.initialize_model_parallel(
pipeline_model_parallel_split_rank_=pipeline_model_parallel_split_rank_
)
assert parallel_state.model_parallel_is_initialized()
split_rank = parallel_state.get_pipeline_model_parallel_split_rank()
assert split_rank is pipeline_model_parallel_split_rank_
fake_split_rank = 7
parallel_state.set_pipeline_model_parallel_split_rank(fake_split_rank)
split_rank = parallel_state.get_pipeline_model_parallel_split_rank()
assert split_rank == fake_split_rank
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print('>> passed the test :-)')
def test_initialize_model_parallel(tensor_model_parallel_size):
if torch.distributed.get_rank() == 0:
print('> testing initialize_model_parallel with size {} ...'.format(
tensor_model_parallel_size))
tensor_model_parallel_size_ = min(
tensor_model_parallel_size,
torch.distributed.get_world_size(),
)
assert not parallel_state.model_parallel_is_initialized()
parallel_state.initialize_model_parallel(tensor_model_parallel_size_)
assert parallel_state.model_parallel_is_initialized()
# Checks.
def check(group, world_size, rank):
assert world_size == torch.distributed.get_world_size(group=group)
assert rank == torch.distributed.get_rank(group=group)
# Model parallel.
world_size = tensor_model_parallel_size_
rank = torch.distributed.get_rank() % tensor_model_parallel_size_
assert world_size == parallel_state.get_tensor_model_parallel_world_size()
assert rank == parallel_state.get_tensor_model_parallel_rank()
check(parallel_state.get_tensor_model_parallel_group(), world_size, rank)
# Data parallel.
world_size = torch.distributed.get_world_size(
) // tensor_model_parallel_size_
rank = torch.distributed.get_rank() // tensor_model_parallel_size
assert world_size == parallel_state.get_data_parallel_world_size()
assert rank == parallel_state.get_data_parallel_rank()
check(parallel_state.get_data_parallel_group(), world_size, rank)
# Reset groups
parallel_state.destroy_model_parallel()
torch.distributed.barrier()
if torch.distributed.get_rank() == 0:
print(TEST_SUCCESS_MESSAGE)
def test_split_tensor_along_last_dim(self):
for tensor_model_paralell_world_size in range(1, self.world_size + 1):
if self.world_size % tensor_model_paralell_world_size > 0:
continue
with self.subTest(tensor_model_paralell_world_size=
tensor_model_paralell_world_size):
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_paralell_world_size
)
device = "cpu"
input_tensor = torch.randn((100, 100, 100), device=device)
splits = utils.split_tensor_along_last_dim(input_tensor, 10)
last_dim_shapes = torch.tensor(
[int(split.size()[-1]) for split in splits])
self.assertTrue(
torch.equal(
last_dim_shapes,
torch.full((10, ), 10),
))
parallel_state.destroy_model_parallel()
batch_size = args.global_batch_size
micro_batch_size = args.micro_batch_size
setup_microbatch_calculator(
args.rank,
args.rampup_batch_size,
args.global_batch_size,
args.micro_batch_size,
args.data_parallel_size, # args.data_parallel_size,
)
world_size = torch.distributed.get_world_size()
print(args.tensor_model_parallel_size, "MODEL PARALLEL SIZE")
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=args.tensor_model_parallel_size,
pipeline_model_parallel_size_=args.pipeline_model_parallel_size,
default_backend="nccl",
p2p_backend="ucc" if HAS_TORCH_UCC else "nccl",
)
pipeline_model_parallel_size = (
parallel_state.get_pipeline_model_parallel_world_size()
)
model_parallel_cuda_manual_seed(0)
model = build_model(
gpt_model_provider,
wrap_with_ddp=True,
virtual_pipeline_model_parallel_size=None,
cpu_offload=args.cpu_offload,
)
assert isinstance(model, list), model
_param_groups = _get_params_for_weight_decay_optimization(model)
def _forward_backward_test_impl(
self,
forward_only: bool,
fwd_bwd_func: FwdStepFunc,
pipeline_model_parallel_world_size: Optional[int],
virtual_pipeline_model_parallel_size: Optional[int],
async_comm: bool = False,
*,
default_backend: Optional[str] = None,
p2p_backend: Optional[str] = None,
) -> None:
if fwd_bwd_func == _forward_backward_pipelining_with_interleaving:
self.assertIsNotNone(virtual_pipeline_model_parallel_size)
self.assertGreater(virtual_pipeline_model_parallel_size, 1)
dtype_options = self.dtypes or [torch.float32, torch.double
] + _get_autocast_dtypes()
for dtype, deallocate_pipeline_outputs in itertools.product(
dtype_options,
self.deallocate_options,
):
grad_scaler = (torch.cuda.amp.GradScaler(
init_scale=4.0) if dtype == torch.half else None)
(tensor_model_parallel_world_size, data_parallel_size,
pipeline_model_parallel_world_size
) = _get_default_world_sizes_model_parallel_world_size(
pipeline_model_parallel_world_size)
parallel_state.initialize_model_parallel(
tensor_model_parallel_size_=tensor_model_parallel_world_size,
pipeline_model_parallel_size_=
pipeline_model_parallel_world_size,
virtual_pipeline_model_parallel_size_=
virtual_pipeline_model_parallel_size,
default_backend=default_backend,
p2p_backend=p2p_backend,
)
pp_utils._reconfigure_microbatch_calculator(
rank=parallel_state.get_tensor_model_parallel_rank(),
rampup_batch_size=None,
global_batch_size=self.GLOBAL_BATCH_SIZE,
micro_batch_size=self.MICRO_BATCH_SIZE,
data_parallel_size=parallel_state.get_data_parallel_world_size(
),
)
global_batch_shape = (
self.GLOBAL_BATCH_SIZE //
parallel_state.get_data_parallel_world_size(),
self.HIDDEN_SIZE,
self.HIDDEN_SIZE,
)
batch = None
if parallel_state.is_pipeline_first_stage():
batch = (torch.ones(global_batch_shape, dtype=dtype).cuda(), )
model = build_model(
testing_utils.model_provider_func,
# Use DDP only when it's better to have
wrap_with_ddp=data_parallel_size > 1,
virtual_pipeline_model_parallel_size=
virtual_pipeline_model_parallel_size,
hidden_size=self.HIDDEN_SIZE,
)
offset = pipeline_model_parallel_world_size if virtual_pipeline_model_parallel_size is not None else 0
for idx, model_module in enumerate(model):
model_module = model_module.to(dtype)
model_module.apply(get_init_weights_func(idx * offset))
_param_groups = _get_params_for_weight_decay_optimization(model)
optimizer = torch.optim.Adam(_param_groups, lr=1e-3)
pp_utils.update_num_microbatches(0)
loss = fwd_bwd_func(
testing_utils.fwd_step_func,
batch,
model,
forward_only=forward_only,
# `tensor_shape` is the shape of micro batch.
tensor_shape=(
self.MICRO_BATCH_SIZE,
self.HIDDEN_SIZE,
self.HIDDEN_SIZE,
),
dtype=dtype,
async_comm=async_comm,
grad_scaler=grad_scaler,
deallocate_pipeline_output=deallocate_pipeline_outputs,
)
if dtype == torch.double:
hidden_size = self.HIDDEN_SIZE
microbatch_size = self.MICRO_BATCH_SIZE
total_layers = pipeline_model_parallel_world_size
if virtual_pipeline_model_parallel_size is not None:
total_layers *= virtual_pipeline_model_parallel_size
target_loss, target_model = get_target_loss_and_model(
global_batch_shape, hidden_size, total_layers)
for loss_item in loss:
x = loss_item['avg']
torch.testing.assert_close(x.item() / microbatch_size,
target_loss.item())
if not forward_only:
for vm_id, model_module in enumerate(model):
params = list(model_module.parameters())
rank = params[0].get_device()
offset = pipeline_model_parallel_world_size
param_id = rank // data_parallel_size + vm_id * offset
target_params = target_model[param_id]
torch.testing.assert_close(params[0].cpu(),
target_params[0])
torch.testing.assert_close(params[1].cpu(),
target_params[1])
torch.testing.assert_close(
params[0].grad.cpu() / microbatch_size,
target_params[0].grad)
torch.testing.assert_close(
params[1].grad.cpu() / microbatch_size,
target_params[1].grad)
if not forward_only:
for m in model:
for p in m.parameters():
self.assertIsNotNone(p.grad)
optimizer.step()
optimizer.zero_grad(set_to_none=True)
parallel_state.destroy_model_parallel()