def test_summon_full_params_equivalence(self, rank0_only, offload_to_cpu):
offload = CPUOffload(offload_params=True)
model = FSDP(DeterministicModel(wrap_fsdp=True, cpu_offload=offload),
cpu_offload=offload)
local_model = DeterministicModel(wrap_fsdp=False)
dev = (torch.device("cpu") if offload_to_cpu else torch.device(
"cuda", torch.cuda.current_device()))
params_to_compare = ([
p.clone() for p in model.parameters()
] if rank0_only and self.rank != 0 else list(local_model.parameters()))
with model.summon_full_params(
model,
recurse=True,
rank0_only=rank0_only,
writeback=not rank0_only,
offload_to_cpu=offload_to_cpu,
):
# Below sleep causes failures without stream synchronization in
# summon_full_params fix.
torch.cuda._sleep(1000000)
# FSDP param deepcopy() of params has issues
fsdp_params = [p.clone() for p in model.parameters()]
self.assertEqual(fsdp_params, params_to_compare)
def test_fsdp_calc_grad_norm_error(self, norm_type):
"""Test the abnormal cases of grad norm cal API."""
model = DeterministicModel(False)
input = torch.rand(12, 2, device=self.rank)
out = model(input)
out.sum().backward()
error_msg = f"Order {norm_type} not supported for matrix norm"
with self.assertRaisesRegex(RuntimeError, error_msg):
total_norm = _calc_grad_norm(model.parameters(), norm_type)
def test_summon_full_params_equivalence(self):
offload = CPUOffload(offload_params=True)
model = FSDP(DeterministicModel(wrap_fsdp=True, cpu_offload=offload),
cpu_offload=offload)
local_model = DeterministicModel(wrap_fsdp=False)
with model.summon_full_params(recurse=True):
# Below sleep causes failures without stream synchronization in
# summon_full_params fix.
torch.cuda._sleep(1000000)
fsdp_params = deepcopy(list(model.parameters()))
self.assertEqual(fsdp_params, list(local_model.parameters()))
def _run_fsdp_one_iteration(self, norm_type, nested_fsdp, cpu_offload):
"""Test FSDP with clip grad norm."""
fsdp_model = DeterministicModel(nested_fsdp, cpu_offload=cpu_offload)
local_model = DeterministicModel(False)
input = torch.rand(14, 2, device=self.rank)
fsdp_model = FSDP(fsdp_model, cpu_offload=cpu_offload)
self.assertTrue(len(input) >= self.world_size)
out = local_model(input[:self.world_size])
out.sum().backward()
in_data = torch.tensor(input[self.rank], device=self.rank)
out_fsdp = fsdp_model(in_data)
out_fsdp.sum().backward()
total_norms_fsdp = _collect_total_grad_norm_fsdp(
fsdp_model, norm_type, self.rank)
total_norms_local = _collect_total_grad_norm_local(
local_model, norm_type)
total_norms_local /= self.world_size
norm_cap = total_norms_fsdp / 2.0
self.assertEqual(total_norms_local, total_norms_fsdp)
fsdp_model.clip_grad_norm_(norm_cap, norm_type=norm_type)
nn_utils.clip_grad_norm_(local_model.parameters(),
norm_cap,
norm_type=norm_type)
total_norms_after_clip_fsdp = _collect_total_grad_norm_fsdp(
fsdp_model, norm_type, self.rank)
total_norms_after_clip_local = _collect_total_grad_norm_local(
local_model, norm_type)
self.assertTrue(total_norms_after_clip_fsdp <= norm_cap)
self.assertEqual(total_norms_after_clip_local,
total_norms_after_clip_fsdp)
def test_fsdp_calc_grad_norm(self, norm_type, nested_fsdp):
"""Test grad norm cal API."""
model = FSDP(DeterministicModel(nested_fsdp))
input = torch.rand(15, 2, device=self.rank)
out = model(input)
out.sum().backward()
total_norm = _calc_grad_norm(model.params_with_grad, norm_type)
total_norm_expected = _collect_total_grad_norm_local(model, norm_type)
self.assertEqual(total_norm, total_norm_expected)
def test_summon_full_params_equivalence(self, rank0_only, offload_to_cpu):
offload = CPUOffload(offload_params=True)
model = FSDP(
DeterministicModel(wrap_fsdp=True, cpu_offload=offload), cpu_offload=offload
)
local_model = DeterministicModel(wrap_fsdp=False)
params_to_compare = (
[p.clone() for p in model.parameters()]
if rank0_only and self.rank != 0
else list(local_model.parameters())
)
writeback = not rank0_only
with model.summon_full_params(
model,
recurse=True,
rank0_only=rank0_only,
writeback=writeback,
offload_to_cpu=offload_to_cpu,
):
if writeback:
with torch.no_grad():
for p in model.parameters():
p.add_(1)
for p in params_to_compare:
p.add_(1)
# Below sleep causes failures without stream synchronization in
# summon_full_params fix.
torch.cuda._sleep(1000000)
# FSDP param deepcopy() of params has issues
fsdp_params = [p.clone() for p in model.parameters()]
self.assertEqual(fsdp_params, params_to_compare)
# CPU offload is enabled for main API, so we should point back to CPU
for param in model.parameters():
self.assertEqual(param.device, torch.device("cpu"))
def test_summon_from_non_fsdp(self):
class FSDPContainer(nn.Module):
def __init__(self, fsdp_1, fsdp_2, fsdp_3):
super().__init__()
self.fsdp_1 = fsdp_1
self.fsdp_2 = fsdp_2
self.fsdp_3 = fsdp_3
model_fsdp = FSDPContainer(
FSDP(DeterministicModel(wrap_fsdp=True)),
FSDP(DeterministicModel(wrap_fsdp=True)),
DeterministicModel(wrap_fsdp=False),
)
model_no_fsdp = FSDPContainer(
DeterministicModel(wrap_fsdp=False),
DeterministicModel(wrap_fsdp=False),
DeterministicModel(wrap_fsdp=False),
)
params_to_compare = list(model_no_fsdp.parameters())
with FSDP.summon_full_params(model_fsdp):
fsdp_params = [p.clone() for p in model_fsdp.parameters()]
self.assertEqual(params_to_compare, fsdp_params)