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71 lines
2.2 KiB
71 lines
2.2 KiB
import torch
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import torch.distributed as dist
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import torch.nn as nn
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import colossalai
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from colossalai.shardformer.layer import DropoutForParallelInput, DropoutForReplicatedInput
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from colossalai.testing import assert_equal, assert_not_equal, rerun_if_address_is_in_use, spawn
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def check_dropout_parallel_input():
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dropout = nn.Dropout().cuda()
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dropout_1d = DropoutForParallelInput.from_native_module(dropout, process_group=None)
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# check computation correctness
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x = torch.rand(4, 128).cuda()
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# we set seed so that dropout will generate the same mask
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torch.cuda.manual_seed(1024)
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out = dropout(x)
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# we set seed to simulate the same scenario
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# but expect the dropout mask to be different
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# due to the internal randomness control
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torch.cuda.manual_seed(1024)
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out_1d = dropout_1d(x)
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# ensure out is the same across all ranks
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world_size = dist.get_world_size()
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out_all = [torch.empty_like(out) for _ in range(world_size)]
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dist.all_gather(out_all, out)
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for i in range(world_size):
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assert_equal(out_all[i], out_all[0])
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# ensure out_1d is different across ranks
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out_1d_all = [torch.zeros_like(out_1d) for _ in range(world_size)]
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dist.all_gather(out_1d_all, out_1d)
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for i in range(1, world_size):
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assert_not_equal(out_1d_all[i], out_1d_all[0])
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def check_dropout_replicated_input():
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dropout = nn.Dropout().cuda()
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dropout_replica = DropoutForReplicatedInput.from_native_module(dropout, process_group=None)
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# check computation correctness
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x = torch.rand(4, 128).cuda()
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out_1d = dropout_replica(x)
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# ensure out_1d is different across ranks
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world_size = dist.get_world_size()
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out_1d_all = [torch.zeros_like(out_1d) for _ in range(world_size)]
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dist.all_gather(out_1d_all, out_1d)
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for i in range(1, world_size):
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assert_equal(out_1d_all[i], out_1d_all[0])
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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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check_dropout_parallel_input()
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check_dropout_replicated_input()
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@rerun_if_address_is_in_use()
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def test_dropout():
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spawn(run_dist, nprocs=2)
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if __name__ == "__main__":
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test_dropout()
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