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91 lines
2.9 KiB
91 lines
2.9 KiB
import pytest
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import colossalai
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import torch
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import torch.multiprocessing as mp
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from colossalai.testing import rerun_if_address_is_in_use
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from colossalai.utils.cuda import get_current_device
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from colossalai.utils import free_port
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from colossalai.utils.model.colo_init_context import ColoInitContext
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from colossalai.gemini import ChunkManager
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from functools import partial
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from colossalai.nn.parallel import ColoDDP, ZeroDDP
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from colossalai.gemini.gemini_mgr import GeminiManager
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from typing import Callable
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import torch.distributed as dist
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import os
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import random
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import numpy as np
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from colossalai.tensor import ProcessGroup
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def set_seed(seed):
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random.seed(seed)
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os.environ['PYTHONHASHSEED'] = str(seed)
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np.random.seed(seed)
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torch.manual_seed(seed)
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torch.cuda.manual_seed(seed)
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torch.backends.cudnn.deterministic = True
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def init_ddp(module: torch.nn.Module) -> ColoDDP:
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pg = ProcessGroup()
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return ColoDDP(module, process_group=pg)
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def init_ddpv2(module: torch.nn.Module, use_chunk: bool = False) -> ZeroDDP:
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pg = ProcessGroup()
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chunk_size = ChunkManager.search_chunk_size(module, 64, 2) if use_chunk else None
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chunk_manager = ChunkManager(chunk_size, pg)
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gemini_manager = GeminiManager('cuda', chunk_manager)
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return ZeroDDP(module, gemini_manager)
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class Net(torch.nn.Module):
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def __init__(self) -> None:
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super().__init__()
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self.fc1 = torch.nn.Linear(3, 3, bias=False)
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self.fc2 = torch.nn.Linear(3, 1, bias=False)
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def forward(self, x):
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return self.fc2(self.fc1(x))
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def run_fwd_bwd(ddp_cls: ColoDDP, init_ddp_func: Callable[[torch.nn.Module], ColoDDP]):
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with ColoInitContext(device=get_current_device()):
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model = Net().cuda()
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w1 = model.fc1.weight
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w2 = model.fc2.weight
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ddp_cls.set_params_to_ignore([w2])
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model = init_ddp_func(model)
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x = torch.rand(2, 3, device=get_current_device())
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logits = model(x)
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loss = torch.sum(logits)
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model.backward(loss)
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w1_grads = [torch.empty_like(w1) for _ in range(dist.get_world_size())]
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dist.all_gather(w1_grads, w1.grad)
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assert torch.equal(w1_grads[0], w1_grads[1])
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w2_grads = [torch.empty_like(w2) for _ in range(dist.get_world_size())]
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dist.all_gather(w2_grads, w2.grad)
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assert not torch.equal(w2_grads[0], w2_grads[1])
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def run_dist(rank, world_size, port):
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colossalai.launch(config={}, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
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set_seed(dist.get_rank())
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run_fwd_bwd(ColoDDP, init_ddp)
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run_fwd_bwd(ZeroDDP, partial(init_ddpv2, use_chunk=False))
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run_fwd_bwd(ZeroDDP, partial(init_ddpv2, use_chunk=True))
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@pytest.mark.dist
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@pytest.mark.parametrize('world_size', [2])
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@rerun_if_address_is_in_use()
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def test_ddp_ignore_params(world_size):
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run_func = partial(run_dist, world_size=world_size, port=free_port())
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mp.spawn(run_func, nprocs=world_size)
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if __name__ == '__main__':
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test_ddp_ignore_params(2)
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