mirror of
https://github.com/saymrwulf/pytorch.git
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4451eb24e6
This PR moves tensor parallel from torch.distributed._tensor.parallel to torch.distributed.tensor.parallel, to prepare for beta release Pull Request resolved: https://github.com/pytorch/pytorch/pull/89878 Approved by: https://github.com/fduwjj
219 lines
7.6 KiB
Python
219 lines
7.6 KiB
Python
# Owner(s): ["oncall: distributed"]
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import torch
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from torch.testing._internal.common_utils import run_tests
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from torch.testing._internal.distributed._tensor.common_dtensor import DTensorTestBase, with_comms
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from torch.distributed._tensor import DeviceMesh, Replicate, DTensor
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from torch.distributed.tensor.parallel.style import (
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ColwiseParallel,
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PairwiseParallel,
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ParallelStyle,
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RowwiseParallel,
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)
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from torch.distributed.tensor.parallel.api import (
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_parallelize_linear,
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_parallelize_mlp,
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)
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from torch.distributed.tensor.parallel._utils import _create_1d_device_mesh
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from torch.distributed.tensor.parallel.style import (
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make_input_replicate_1d,
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make_output_replicate_1d,
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)
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class MLPModule(torch.nn.Module):
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def __init__(self, device):
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super(MLPModule, self).__init__()
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torch.manual_seed(5)
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self.net1 = torch.nn.Linear(10, 16, device=device)
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self.relu = torch.nn.ReLU()
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self.net2 = torch.nn.Linear(16, 12, device=device)
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def forward(self, x):
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return self.net2(self.relu(self.net1(x)))
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class TensorParallelAPITests(DTensorTestBase):
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@property
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def world_size(self):
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gpu_num = torch.cuda.device_count()
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return gpu_num if gpu_num % 2 == 0 and gpu_num > 4 else 4
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@with_comms
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def test_creat_1d_device_mesh(self):
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dim_one_size = 2
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mesh_shape = (
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torch.arange(self.world_size)
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.reshape(
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self.world_size // dim_one_size,
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dim_one_size,
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)
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.to(torch.int)
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)
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mesh = DeviceMesh(self.device_type, mesh_shape)
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# When 1D dim is 1.
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one_dimention_mesh_shape = mesh_shape[self.rank // dim_one_size, :]
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pg = mesh.get_dim_groups()[1]
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new_mesh = _create_1d_device_mesh(mesh, 1)
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expected_mesh = DeviceMesh(
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self.device_type, one_dimention_mesh_shape, [pg]
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)
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self.assertEqual(new_mesh.mesh, expected_mesh.mesh)
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self.assertEqual(new_mesh.device_type, expected_mesh.device_type)
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# When 1D dim is 0.
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one_dimention_mesh_shape = mesh_shape[:, self.rank % dim_one_size]
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pg = mesh.get_dim_groups()[0]
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new_mesh = _create_1d_device_mesh(mesh, 0)
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expected_mesh = DeviceMesh(
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self.device_type, one_dimention_mesh_shape, [pg]
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)
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self.assertEqual(new_mesh.mesh, expected_mesh.mesh)
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self.assertEqual(new_mesh.device_type, expected_mesh.device_type)
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@with_comms
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def test_creat_1d_device_mesh_error(self):
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mesh = DeviceMesh(self.device_type, torch.arange(self.world_size))
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with self.assertRaisesRegex(
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AssertionError,
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"Expect tp_mesh_dim within range \\[-1, 1\\), but found 3.",
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):
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_create_1d_device_mesh(mesh, 3)
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def _compare_params(
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self,
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local_module,
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dist_module,
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skip_rowwise_bias=False,
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compare_grad=False,
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):
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replicate = [Replicate()]
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for name, param in local_module.named_parameters():
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dist_param = dist_module.get_parameter(name)
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param = param.grad if compare_grad else param
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dist_param = dist_param.grad if compare_grad else dist_param
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if self.rank == 0 or (
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name not in ["net2.bias"]
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and not skip_rowwise_bias
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or name not in ["bias", "net2.bias"]
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):
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self.assertEqual(
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param,
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dist_param.redistribute(
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device_mesh=dist_param.device_mesh, placements=replicate
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).to_local(),
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)
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def _compare_module(
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self, local_module, dist_module, inp_size, rowwise=False
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):
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LR = 0.25 # the learning rate we use for testing
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local_optim = torch.optim.SGD(local_module.parameters(), lr=LR)
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dist_optim = torch.optim.SGD(dist_module.parameters(), lr=LR)
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torch.manual_seed(0)
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inp = torch.rand(*inp_size, device=self.device_type)
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self._compare_params(local_module, dist_module)
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# check forward correctness
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local_output = local_module(inp)
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inp = inp.chunk(self.world_size, dim=-1)[self.rank] if rowwise else inp
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dist_output = dist_module(inp)
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dist_output = (
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dist_output.to_local()
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if isinstance(dist_output, DTensor)
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else dist_output
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)
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self.assertEqual(local_output, dist_output)
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local_output.sum().backward()
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dist_output.sum().backward()
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# check backward and ensure gradients are same
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self._compare_params(local_module, dist_module, rowwise, True)
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local_optim.step()
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dist_optim.step()
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self._compare_params(local_module, dist_module, rowwise)
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@with_comms
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def test_parallelize_mlp(self):
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inp_size = [12, 10]
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model = MLPModule(self.device_type)
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model_tp = MLPModule(self.device_type)
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# Ensure model are initialized the same way.
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self.assertEqual(model.net1.weight, model_tp.net1.weight)
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self.assertEqual(model.net1.bias, model_tp.net1.bias)
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self.assertEqual(model.net2.weight, model_tp.net2.weight)
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self.assertEqual(model.net2.bias, model_tp.net2.bias)
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# Parallelize module.
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device_mesh = DeviceMesh(
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self.device_type, torch.arange(self.world_size)
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)
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model_tp = _parallelize_mlp(model_tp, device_mesh, PairwiseParallel())
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self._compare_module(model, model_tp, inp_size)
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@with_comms
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def test_parallelize_mlp_error(self):
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class DummyParallel(ParallelStyle):
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def __init__(self) -> None:
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super().__init__(
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make_input_replicate_1d, make_output_replicate_1d
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)
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model_tp = MLPModule(self.device_type)
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device_mesh = DeviceMesh(
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self.device_type, torch.arange(self.world_size)
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)
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with self.assertRaisesRegex(
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NotImplementedError,
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"Only support PairwiseParallel for MLP parallelization.",
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):
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_parallelize_mlp(model_tp, device_mesh, DummyParallel())
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with self.assertRaisesRegex(
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RuntimeError, "More than one nn.Linear needed for a MLP."
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):
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_parallelize_mlp(
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torch.nn.Linear(10, 5), device_mesh, PairwiseParallel()
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)
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@with_comms
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def test_linear_row_wise_parallel(self):
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# test RowwiseParallel
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inp_size = [9, 16]
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rowwise = RowwiseParallel()
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torch.manual_seed(5)
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model = torch.nn.Linear(16, 10, device=self.device_type)
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torch.manual_seed(5)
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model_tp = torch.nn.Linear(16, 10, device=self.device_type)
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# parallelize model_tp
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device_mesh = DeviceMesh(self.device_type, list(range(self.world_size)))
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model_tp = _parallelize_linear(model_tp, device_mesh, rowwise)
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# let each rank generate unique local input
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torch.manual_seed(self.rank)
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self._compare_module(model, model_tp, inp_size, True)
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@with_comms
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def test_linear_col_wise_parallel(self):
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# test ColwiseParallel
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inp_size = [8, 10]
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colwise = ColwiseParallel()
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torch.manual_seed(5)
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model = torch.nn.Linear(10, 16, device=self.device_type)
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torch.manual_seed(5)
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model_tp = torch.nn.Linear(10, 16, device=self.device_type)
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# parallelize model_tp
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device_mesh = DeviceMesh(self.device_type, list(range(self.world_size)))
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model_tp = _parallelize_linear(model_tp, device_mesh, colwise)
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self._compare_module(model, model_tp, inp_size)
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if __name__ == "__main__":
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run_tests()
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