mirror of https://github.com/hpcaitech/ColossalAI
105 lines
3.7 KiB
Python
105 lines
3.7 KiB
Python
from functools import partial
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import pytest
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import torch
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import torch.nn as nn
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import torch.multiprocessing as mp
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import colossalai
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from colossalai.context import ParallelMode
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from colossalai.core import global_context as gpc
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from colossalai.utils import free_port, get_current_device
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from colossalai.nn.layer.moe import Top1Router, Top2Router, MoeLayer, Experts
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from colossalai.context.moe_context import MOE_CONTEXT
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from colossalai.testing import rerun_on_exception
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BATCH_SIZE = 16
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NUM_EXPERTS = 4
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CONFIG = dict()
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def check_equal(tensor_a, tensor_b, atol=1e-06):
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assert torch.allclose(tensor_a, tensor_b, rtol=0, atol=atol) is True
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def run_routing(rank, world_size, port, rs=2, hidden_size=128, data_type=torch.float32, router=Top2Router):
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# Here we do not need TF32, since it brings absolute error on results
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torch.backends.cuda.matmul.allow_tf32 = False
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colossalai.launch(config=CONFIG, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
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local_rank = gpc.get_local_rank(ParallelMode.GLOBAL)
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MOE_CONTEXT.setup(42) # MOE environment initialization
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MOE_CONTEXT.reset_loss()
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torch.manual_seed(rs + local_rank) # set each process has different random seed
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# get randomized data
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tokens = torch.randn(BATCH_SIZE, hidden_size, dtype=data_type, device=get_current_device(), requires_grad=True)
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expert_module = nn.Linear
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expert_factor = dict(in_features=hidden_size, out_features=hidden_size, device=get_current_device())
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expert = Experts(expert_module, NUM_EXPERTS, **expert_factor)
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layer = MoeLayer(hidden_size, NUM_EXPERTS, router(capacity_factor_train=1.0), expert)
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if data_type == torch.float16:
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layer = layer.half()
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# use matrix multiplication instead of COL_MOE_KERNL in MOE dispatch and combine
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layer.use_kernel = False
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old_out = layer(tokens)
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ech = old_out.shape
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grad = torch.randn(ech, device=get_current_device())
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old_out.backward(grad) # get gradient
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# save all results
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o_tk_grad = tokens.grad.data.clone()
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o_gt_grad = layer.gate.weight.grad.data.clone()
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# reset all gradients
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tokens.grad.zero_()
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layer.gate.weight.grad.zero_()
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layer.use_kernel = True
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new_out = layer(tokens) # get ouputs through colossal kernel
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if data_type == torch.float32:
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check_equal(old_out, new_out)
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else:
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check_equal(old_out, new_out, 1e-2)
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# forward function passed
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new_out.backward(grad) # get new type gradient
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n_tk_grad = tokens.grad.data.clone()
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n_gt_grad = layer.gate.weight.grad.data.clone()
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if data_type == torch.float32:
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check_equal(o_tk_grad, n_tk_grad)
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else:
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check_equal(o_tk_grad, o_tk_grad, 1e-2)
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# tokens gradient is correct
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if data_type == torch.float32:
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check_equal(o_gt_grad, n_gt_grad, 5e-05)
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else:
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check_equal(o_gt_grad, n_gt_grad, 2e-01)
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# bias gradient is correct
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@pytest.mark.dist
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@pytest.mark.parametrize("rs", [131])
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@pytest.mark.parametrize("hidden_size", [32, 144])
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@pytest.mark.parametrize("data_type", [torch.float32, torch.float16])
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@pytest.mark.parametrize("router", [Top1Router, Top2Router])
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@rerun_on_exception(exception_type=mp.ProcessRaisedException, pattern=".*Address already in use.*")
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def test_moe_kernel(rs, hidden_size, data_type, router):
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world_size = 4
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run_func = partial(run_routing,
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world_size=world_size,
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port=free_port(),
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rs=rs,
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hidden_size=hidden_size,
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data_type=data_type,
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router=router)
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mp.spawn(run_func, nprocs=world_size)
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if __name__ == '__main__':
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test_moe_kernel(2, 256, torch.float16, Top2Router)
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