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31 lines
1.1 KiB
31 lines
1.1 KiB
import torch
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import torch.distributed as dist
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from torch import Tensor
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from torch.distributed import ProcessGroup
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from torch.testing import assert_close
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def assert_equal(a: Tensor, b: Tensor):
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assert torch.all(a == b), f'expected a and b to be equal but they are not, {a} vs {b}'
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def assert_not_equal(a: Tensor, b: Tensor):
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assert not torch.all(a == b), f'expected a and b to be not equal but they are, {a} vs {b}'
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def assert_close_loose(a: Tensor, b: Tensor, rtol: float = 1e-3, atol: float = 1e-3):
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assert_close(a, b, rtol=rtol, atol=atol)
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def assert_equal_in_group(tensor: Tensor, process_group: ProcessGroup = None):
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# all gather tensors from different ranks
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world_size = dist.get_world_size(process_group)
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tensor_list = [torch.empty_like(tensor) for _ in range(world_size)]
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dist.all_gather(tensor_list, tensor, group=process_group)
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# check if they are equal one by one
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for i in range(world_size - 1):
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a = tensor_list[i]
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b = tensor_list[i + 1]
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assert torch.all(a == b), f'expected tensors on rank {i} and {i + 1} to be equal but they are not, {a} vs {b}'
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