b94fc13d3f
Currently, the vllm pull request
(https://github.com/vllm-project/vllm/pull/24252) is causing operator
fusion to fail. This issue was previously fixed by patching the backend.
The root cause has been identified, and the problem can be resolved with
this pull request.
- vLLM version: v0.13.0
- vLLM main:
2f4e6548ef
---------
Signed-off-by: wxsIcey <1790571317@qq.com>
292 lines
12 KiB
Python
292 lines
12 KiB
Python
#
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# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
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# This file is a part of the vllm-ascend project.
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#
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import torch
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import torch._inductor.pattern_matcher as pm
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from torch._inductor.pattern_matcher import (PatternMatcherPass,
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PatternPrettyPrinter)
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from vllm.attention.layer import Attention
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from vllm.compilation.vllm_inductor_pass import VllmInductorPass
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from vllm.config import VllmConfig, get_layers_from_vllm_config
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from vllm.config.compilation import Range
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from vllm.logger import logger
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class QKNormRopeFusionPattern:
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def __init__(self,
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vllm_config,
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head_dim,
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num_heads,
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num_kv_heads,
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eps=1e-6):
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self.vllm_config = vllm_config
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self.head_dim = head_dim
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self.num_heads = num_heads
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self.num_kv_heads = num_kv_heads
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self.q_size = self.num_heads * self.head_dim
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self.kv_size = self.num_kv_heads * self.head_dim
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self.eps = eps
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self.device = vllm_config.device_config.device if vllm_config.device_config else None
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def get_inputs(self):
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T = 5
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qkv = torch.empty(T,
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self.q_size + 2 * self.kv_size,
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dtype=torch.bfloat16,
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device="npu")
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q_weight = torch.empty(self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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k_weight = torch.empty(self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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cos = torch.empty(1,
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T,
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1,
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self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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sin = torch.empty(1,
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T,
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1,
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self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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return [qkv, q_weight, k_weight, cos, sin]
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def register(self, pm_pass: PatternMatcherPass):
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def pattern(qkv: torch.Tensor, q_weight: torch.Tensor,
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k_weight: torch.Tensor, cos: torch.Tensor,
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sin: torch.Tensor):
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q, k, v = qkv.split([self.q_size, self.kv_size, self.kv_size],
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dim=-1)
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q_by_head = q.view(*q.shape[:-1], q.shape[-1] // self.head_dim,
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self.head_dim)
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q_norm_out, _ = torch.ops.npu.npu_rms_norm(q_by_head, q_weight,
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self.eps)
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k_by_head = k.view(*k.shape[:-1], k.shape[-1] // self.head_dim,
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self.head_dim)
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k_norm_out, _ = torch.ops.npu.npu_rms_norm(k_by_head, k_weight,
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self.eps)
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q_flat = q_norm_out.view(q.shape)
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q_reshape = q_flat.contiguous().view(1, q_flat.shape[0], -1,
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self.head_dim)
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k_flat = k_norm_out.view(k.shape)
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k_reshape = k_flat.contiguous().view(1, k_flat.shape[0], -1,
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self.head_dim)
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q_rope, k_rope = torch.ops.npu.npu_apply_rotary_pos_emb(
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q_reshape, k_reshape, cos, sin)
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return q_rope, k_rope, v
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def replacement(qkv: torch.Tensor, q_weight: torch.Tensor,
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k_weight: torch.Tensor, cos: torch.Tensor,
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sin: torch.Tensor):
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results = torch.ops.vllm.qkv_rmsnorm_rope(
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input=qkv,
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q_weight=q_weight,
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k_weight=k_weight,
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q_hidden_size=self.q_size,
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kv_hidden_size=self.kv_size,
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head_dim=self.head_dim,
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eps=self.eps,
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q_bias=None,
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k_bias=None,
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sin=sin,
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cos=cos)
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return results
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pm.register_replacement(pattern, replacement, self.get_inputs(),
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pm.fwd_only, pm_pass)
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class QKNormRopeFusionPatternWithBias:
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def __init__(self,
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vllm_config,
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head_dim,
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num_heads,
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num_kv_heads,
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eps=1e-6):
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self.head_dim = head_dim
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self.num_heads = num_heads
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self.num_kv_heads = num_kv_heads
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self.q_size = self.num_heads * self.head_dim
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self.kv_size = self.num_kv_heads * self.head_dim
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self.eps = eps
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self.vllm_config = vllm_config
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self.device = vllm_config.device_config.device if vllm_config.device_config else None
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def get_inputs(self):
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T = 5
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qkv = torch.empty(T,
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self.q_size + 2 * self.kv_size,
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dtype=torch.bfloat16,
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device="npu")
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q_weight = torch.empty(self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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k_weight = torch.empty(self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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q_bias = torch.empty(self.head_dim, dtype=torch.bfloat16, device="npu")
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k_bias = torch.empty(self.head_dim, dtype=torch.bfloat16, device="npu")
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cos = torch.empty(1,
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T,
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1,
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self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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sin = torch.empty(1,
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T,
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1,
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self.head_dim,
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dtype=torch.bfloat16,
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device="npu")
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return [qkv, q_weight, k_weight, q_bias, k_bias, cos, sin]
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def register(self, pm_pass: PatternMatcherPass):
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def pattern(qkv: torch.Tensor, q_weight: torch.Tensor,
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k_weight: torch.Tensor, q_bias: torch.Tensor,
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k_bias: torch.Tensor, cos: torch.Tensor,
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sin: torch.Tensor):
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q, k, v = qkv.split([self.q_size, self.kv_size, self.kv_size],
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dim=-1)
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q_by_head = q.view(*q.shape[:-1], q.shape[-1] // self.head_dim,
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self.head_dim)
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q_norm_out, _ = torch.ops.npu.npu_rms_norm(q_by_head, q_weight,
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self.eps)
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q_normed = q_norm_out + q_bias
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k_by_head = k.view(*k.shape[:-1], k.shape[-1] // self.head_dim,
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self.head_dim)
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k_norm_out, _ = torch.ops.npu.npu_rms_norm(k_by_head, k_weight,
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self.eps)
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k_normed = k_norm_out + k_bias
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q_flat = q_normed.view(q.shape)
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q_reshape = q_flat.contiguous().view(1, q_flat.shape[0], -1,
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self.head_dim)
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k_flat = k_normed.view(k.shape)
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k_reshape = k_flat.contiguous().view(1, k_flat.shape[0], -1,
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self.head_dim)
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q_rope, k_rope = torch.ops.npu.npu_apply_rotary_pos_emb(
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q_reshape, k_reshape, cos, sin)
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return q_rope, k_rope, v
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def replacement(qkv: torch.Tensor, q_weight: torch.Tensor,
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k_weight: torch.Tensor, q_bias: torch.Tensor,
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k_bias: torch.Tensor, cos: torch.Tensor,
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sin: torch.Tensor):
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results = torch.ops.vllm.qkv_rmsnorm_rope(
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input=qkv,
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q_weight=q_weight,
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k_weight=k_weight,
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q_hidden_size=self.q_size,
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kv_hidden_size=self.kv_size,
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head_dim=self.head_dim,
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eps=self.eps,
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q_bias=q_bias,
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k_bias=k_bias,
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cos=cos,
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sin=sin)
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return results
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pm.register_replacement(pattern, replacement, self.get_inputs(),
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pm.fwd_only, pm_pass)
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class QKNormRopeFusionPass(VllmInductorPass):
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"""
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A pass for fusing QKV split and RMSNorm operations into a single qk_rmsnorm operator.
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"""
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def __init__(self, vllm_config: VllmConfig):
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super().__init__(vllm_config)
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self.pattern_match_passes: PatternMatcherPass = PatternMatcherPass(
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pass_name="qknorm_rope_fusion_pass")
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dtype = vllm_config.model_config.dtype
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if dtype not in (torch.bfloat16, torch.float16):
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logger.debug(
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"QKNorm and Rope fusion not enabled: unsupported dtype %s",
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dtype)
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return
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# use one attn layer to get meta (such as head_dim) for QKNormRopeFusionPattern
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attn_layers: dict[str, Attention] = get_layers_from_vllm_config(
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vllm_config, Attention)
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if len(attn_layers) == 0:
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logger.debug(
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"QKNorm and Rope fusion enabled, but no Attention layers were discovered."
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)
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return
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layer = next(iter(attn_layers.values()))
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for epsilon in [1e-6, 1e-5]:
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if layer.head_size != 128:
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logger.debug(
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"QKNorm and Rope fusion not enabled: head_dim %d is not equal of 128",
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layer.head_size)
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continue
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QKNormRopeFusionPattern(vllm_config=vllm_config,
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head_dim=layer.head_size,
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num_heads=layer.num_heads,
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num_kv_heads=layer.num_kv_heads,
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eps=epsilon).register(
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self.pattern_match_passes)
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QKNormRopeFusionPatternWithBias(vllm_config=vllm_config,
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head_dim=layer.head_size,
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num_heads=layer.num_heads,
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num_kv_heads=layer.num_kv_heads,
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eps=epsilon).register(
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self.pattern_match_passes)
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def __call__(self, graph: torch.fx.Graph):
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self.begin()
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self.matched_count = self.pattern_match_passes.apply(graph)
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logger.debug("Fused %s QKNorm and Rope patterns", self.matched_count)
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logger.debug("Patterns registered for replacement:")
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pattern_idx = 0
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for pattern_entry in self.pattern_match_passes.patterns.values():
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for p in pattern_entry:
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p_str = PatternPrettyPrinter.run(p.pattern)
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logger.debug("Pattern %d: %s", pattern_idx, p_str)
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pattern_idx += 1
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self.end_and_log()
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def is_applicable_for_range(self, compile_range: Range) -> bool:
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"""
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Check if the pass is applicable for the current configuration.
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"""
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return True
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