wehub-resource-sync
59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
# Some code borrowed from the awesome work: https://github.com/zhuzilin/ring-flash-attention
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# Copyright (c) ModelScope Contributors. All rights reserved.
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import torch
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import torch.distributed as dist
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from typing import Optional, Tuple
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class RingComm:
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def __init__(self, process_group: dist.ProcessGroup):
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self._process_group = process_group
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self._ops = []
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self.rank = dist.get_rank(self._process_group)
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self.world_size = dist.get_world_size(self._process_group)
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self._reqs = None
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self.send_rank = (self.rank + 1) % self.world_size
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self.recv_rank = (self.rank - 1) % self.world_size
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if process_group is not None:
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self.send_rank = dist.get_global_rank(self._process_group, self.send_rank)
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self.recv_rank = dist.get_global_rank(self._process_group, self.recv_rank)
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def send_recv(self, to_send: torch.Tensor, recv_tensor: Optional[torch.Tensor] = None) -> torch.Tensor:
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if recv_tensor is None:
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res = torch.empty_like(to_send)
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else:
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res = recv_tensor
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send_op = dist.P2POp(dist.isend, to_send, self.send_rank, group=self._process_group)
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recv_op = dist.P2POp(dist.irecv, res, self.recv_rank, group=self._process_group)
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self._ops.append(send_op)
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self._ops.append(recv_op)
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return res
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def commit(self):
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if self._reqs is not None:
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raise RuntimeError('commit called twice')
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self._reqs = dist.batch_isend_irecv(self._ops)
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def wait(self):
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if self._reqs is None:
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raise RuntimeError('wait called before commit')
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for req in self._reqs:
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req.wait()
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self._reqs = None
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self._ops = []
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def send_recv_kv(
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self,
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k: torch.Tensor,
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v: torch.Tensor,
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k_buffer: Optional[torch.Tensor] = None,
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v_buffer: Optional[torch.Tensor] = None,
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) -> Tuple[torch.Tensor, torch.Tensor]:
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next_k, next_v = self.send_recv(k, k_buffer), self.send_recv(v, v_buffer)
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self.commit()
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return next_k, next_v
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