7f2a703ed5
* Merge with private repo * Update README * Update README * Update README * Add PyTorch requirements * Fix sync scopes for MQA logits (#256) * Update README
129 lines
4.9 KiB
Python
129 lines
4.9 KiB
Python
import torch
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from typing import Tuple, Optional
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from ..utils.math import align
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# noinspection PyBroadException
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try:
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# noinspection PyProtectedMember
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import torch.distributed._symmetric_memory as symm_mem
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import torch.distributed as dist
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except Exception as exception:
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print(f'Failed to load mega kernels, please check your PyTorch version: {exception}')
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from .. import _C
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class SymmBuffer:
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def __init__(self, group: dist.ProcessGroup,
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# MoE arguments
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num_experts: int,
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num_max_tokens_per_rank: int, num_topk: int,
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hidden: int, intermediate_hidden: int,
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use_fp8_dispatch: bool = True,
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activation: str = 'swiglu'):
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self.group = group
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self.num_experts = num_experts
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self.num_max_tokens_per_rank = num_max_tokens_per_rank
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self.num_topk = num_topk
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self.hidden = hidden
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self.intermediate_hidden = intermediate_hidden
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# Allocate a symmetric buffer
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num_bytes, slice_input_buffers = _C.get_symm_buffer_size_for_mega_moe(
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group.size(), num_experts,
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num_max_tokens_per_rank, num_topk,
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hidden, intermediate_hidden,
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use_fp8_dispatch, activation
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)
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self.buffer = symm_mem.empty(num_bytes, dtype=torch.int8, device='cuda')
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self.handle = symm_mem.rendezvous(self.buffer, group=group)
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self.buffer.zero_()
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self.group.barrier()
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torch.cuda.synchronize()
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# Create input buffer views
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(self.x, self.x_sf,
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self.topk_idx, self.topk_weights,
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self.l1_acts, self.l1_acts_sf,
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self.l2_acts, self.l2_acts_sf) = slice_input_buffers(self.buffer)
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def destroy(self):
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self.handle = None
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self.buffer = None
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self.group = None
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self.x = None
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self.x_sf = None
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def get_symm_buffer_for_mega_moe(group: dist.ProcessGroup,
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num_experts: int,
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num_max_tokens_per_rank: int, num_topk: int,
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hidden: int, intermediate_hidden: int,
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use_fp8_dispatch: bool = True,
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activation: str = 'swiglu') -> SymmBuffer:
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# Token count must be aligned to block m
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num_ranks = group.size()
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block_m = _C.get_block_m_for_mega_moe(num_ranks, num_experts, num_max_tokens_per_rank, num_topk)
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num_max_tokens_per_rank = align(num_max_tokens_per_rank, block_m)
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return SymmBuffer(
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group, num_experts,
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num_max_tokens_per_rank, num_topk,
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hidden, intermediate_hidden,
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use_fp8_dispatch, activation
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)
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def _interleave_l1_weights(l1_weights: Tuple[torch.Tensor, torch.Tensor]) -> Tuple[torch.Tensor, torch.Tensor]:
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# [gate: 0..7, up: 0..7, gate: 8..15, up: 8..15, ...] instead of [gate | up]
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def interleave(t, gran: int = 8) -> torch.Tensor:
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g, n, *rest = t.shape
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half = n // 2
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gate = t[:, :half].reshape(g, half // gran, gran, *rest)
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up = t[:, half:].reshape(g, half // gran, gran, *rest)
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return torch.empty_like(t).copy_(torch.stack([gate, up], dim=2).reshape(g, n, *rest))
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return interleave(l1_weights[0]), interleave(l1_weights[1])
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def _transpose_sf_for_utccp(sf: torch.Tensor) -> torch.Tensor:
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num_groups, mn, packed_sf_k = sf.shape
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assert sf.dtype == torch.int and mn % 128 == 0
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result = (sf.reshape(num_groups, -1, 4, 32, packed_sf_k)
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.transpose(2, 3)
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.reshape(num_groups, mn, packed_sf_k))
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return torch.empty_like(sf).copy_(result)
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def transform_weights_for_mega_moe(
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l1_weights: Tuple[torch.Tensor, torch.Tensor],
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l2_weights: Tuple[torch.Tensor, torch.Tensor]
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) -> Tuple[Tuple[torch.Tensor, torch.Tensor], Tuple[torch.Tensor, torch.Tensor]]:
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# L1: interleave gate/up, then transpose SF for UTCCP
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l1_interleaved = _interleave_l1_weights(l1_weights)
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l1_weights = (l1_interleaved[0], _transpose_sf_for_utccp(l1_interleaved[1]))
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# L2: only transpose SF for UTCCP
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l2_weights = (l2_weights[0], _transpose_sf_for_utccp(l2_weights[1]))
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return l1_weights, l2_weights
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def fp8_fp4_mega_moe(y: torch.Tensor,
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l1_weights: Tuple[torch.Tensor, torch.Tensor],
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l2_weights: Tuple[torch.Tensor, torch.Tensor],
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sym_buffer: SymmBuffer,
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recipe: Tuple[int, int, int] = (1, 1, 32),
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activation: str = 'swiglu',
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activation_clamp: Optional[float] = None,
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fast_math: bool = True):
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_C.fp8_fp4_mega_moe(
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y,
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l1_weights, l2_weights,
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sym_buffer.buffer,
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sym_buffer.handle.buffer_ptrs, sym_buffer.group.rank(),
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sym_buffer.num_max_tokens_per_rank,
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sym_buffer.num_experts, sym_buffer.num_topk,
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recipe,
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activation, activation_clamp,
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fast_math
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)
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