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431 lines
18 KiB
Python
431 lines
18 KiB
Python
#
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# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
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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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# This file is a part of the vllm-ascend project.
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#
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import math
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from typing import Optional, Tuple
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import torch
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import torch_npu
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from vllm.forward_context import get_forward_context
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from vllm.model_executor.layers.rotary_embedding import (
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DeepseekScalingRotaryEmbedding, MRotaryEmbedding, RotaryEmbedding,
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YaRNScalingRotaryEmbedding)
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from vllm_npu.platform import NPUPlatform
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from vllm_npu.utils import enable_custom_op, is_310p
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def _custom_rotary_embedding_enabled(query, neox_style, head_size):
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return query.dtype == torch.float16 and neox_style and head_size % 32 == 0 and enable_custom_op(
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)
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def _rope_forward_oot(
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self,
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positions: torch.Tensor,
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query: torch.Tensor,
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key: torch.Tensor,
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is_neox_style: bool,
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offsets: Optional[torch.Tensor] = None
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) -> Tuple[torch.Tensor, torch.Tensor]:
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query_shape, key_shape = query.shape, key.shape
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if self.cos_sin_cache.device != query.device:
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self.cos_sin_cache = self.cos_sin_cache.to(query.device)
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if self.cos_sin_cache.dtype != query.dtype:
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self.cos_sin_cache = self.cos_sin_cache.to(query.dtype)
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# adopt custom kernel path for rotary_embedding
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if _custom_rotary_embedding_enabled(query, is_neox_style,
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self.head_size) and not is_310p():
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query, key = torch.ops._C_ascend.rotary_embedding(
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positions,
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query,
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key,
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self.head_size,
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self.cos_sin_cache,
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is_neox_style,
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)
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return query.view(query_shape), key.view(key_shape)
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if offsets is not None:
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raise NotImplementedError(
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"Batched rotary embedding is currently not supported on NPU.")
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else:
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if self.cos is not None and \
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self.sin is not None:
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# If cos and sin are generated outside, use npu_apply_rotary_pos_emb to avoid redundant calculation.
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# This method requires head_size and rotary_dim equal 128 and neox_style is True
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query = query.contiguous().view(1, query.shape[0], -1,
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self.head_size)
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key = key.contiguous().view(1, key.shape[0], -1, self.head_size)
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torch_npu.npu_apply_rotary_pos_emb(query, key, self.cos, self.sin)
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elif self.rotary_dim < self.head_size:
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num_tokens = query.shape[0]
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query = query.view(num_tokens, -1, self.head_size)
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key = key.view(num_tokens, -1, self.head_size)
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q_rot = query[..., :self.rotary_dim]
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q_pass = query[..., self.rotary_dim:]
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k_rot = key[..., :self.rotary_dim]
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k_pass = key[..., self.rotary_dim:]
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q_rot = q_rot.contiguous().view(num_tokens, -1)
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k_rot = k_rot.contiguous().view(num_tokens, -1)
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torch_npu._npu_rotary_embedding(
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positions,
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q_rot,
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k_rot,
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self.head_size,
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self.cos_sin_cache,
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is_neox_style,
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)
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q_rot = q_rot.view(num_tokens, -1, self.rotary_dim)
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k_rot = k_rot.view(num_tokens, -1, self.rotary_dim)
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q = torch.cat((q_rot, q_pass), dim=-1).reshape(query_shape)
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k = torch.cat((k_rot, k_pass), dim=-1).reshape(key_shape)
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return q, k
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else:
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# TODO: Remove the contiguous in the future.
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query = query.contiguous().view(query.shape[0], -1)
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key = key.contiguous().view(key.shape[0], -1)
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torch_npu._npu_rotary_embedding(
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positions,
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query,
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key,
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self.head_size,
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self.cos_sin_cache,
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is_neox_style,
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)
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return query.view(query_shape), key.view(key_shape)
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class AscendRotaryEmbedding(RotaryEmbedding):
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def __init__(
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self,
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head_size: int,
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rotary_dim: int,
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max_position_embeddings: int,
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base: float,
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is_neox_style: bool,
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dtype: torch.dtype,
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) -> None:
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self.cos = None
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self.sin = None
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super().__init__(head_size, rotary_dim, max_position_embeddings, base,
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is_neox_style, dtype)
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def forward_oot(
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self,
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positions: torch.Tensor,
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query: torch.Tensor,
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key: torch.Tensor,
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offsets: Optional[torch.Tensor] = None,
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is_neox_style_override: Optional[bool] = None,
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):
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is_neox_style = self.is_neox_style
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if is_neox_style_override is not None:
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is_neox_style = is_neox_style_override
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forward_context = get_forward_context()
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is_first_layer = forward_context.is_first_layer
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# Generate cos and sin outside layers to avoid repeated calculation.
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if is_neox_style and self.head_size == 128 and self.cos_sin_cache.shape[
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-1] == 128:
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if is_first_layer:
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cos_sin = self.cos_sin_cache.index_select(0, positions)
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last_dim = cos_sin.size()[-1]
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cos, sin = cos_sin.reshape(-1, 2, last_dim // 2).repeat(
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1, 1, 2).chunk(2, dim=-2)
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# BSNH
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self.cos = cos.view(1, -1, 1, last_dim).contiguous()
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self.sin = sin.view(1, -1, 1, last_dim).contiguous()
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forward_context.is_first_layer = False
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return _rope_forward_oot(self, positions, query, key, is_neox_style,
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offsets)
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class AscendYaRNRotaryEmbedding(YaRNScalingRotaryEmbedding):
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def __init__(
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self,
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head_size: int,
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rotary_dim: int,
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max_position_embeddings: int,
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base: float,
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is_neox_style: bool,
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scaling_factor: float,
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dtype: torch.dtype,
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*,
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extrapolation_factor: float = 1,
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attn_factor: float = 1,
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beta_fast: int = 32,
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beta_slow: int = 1,
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) -> None:
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self.cos = None
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self.sin = None
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extra_kwargs = {
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"extrapolation_factor": extrapolation_factor,
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"attn_factor": attn_factor,
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"beta_fast": beta_fast,
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"beta_slow": beta_slow
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}
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super().__init__(head_size, rotary_dim, max_position_embeddings, base,
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is_neox_style, scaling_factor, dtype, **extra_kwargs)
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def forward_oot(
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self,
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positions: torch.Tensor,
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query: torch.Tensor,
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key: torch.Tensor,
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offsets: Optional[torch.Tensor] = None,
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is_neox_style_override: Optional[bool] = None,
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):
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return AscendRotaryEmbedding.forward_oot(self, positions, query, key,
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offsets,
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is_neox_style_override)
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class AscendDeepseekScalingRotaryEmbedding(DeepseekScalingRotaryEmbedding):
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def __init__(
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self,
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head_size: int,
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rotary_dim: int,
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max_position_embeddings: int,
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base: int,
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is_neox_style: bool,
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scaling_factor: float,
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dtype: torch.dtype,
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*,
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extrapolation_factor: float = 1,
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attn_factor: float = 1,
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beta_fast: int = 32,
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beta_slow: int = 1,
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mscale: float = 1,
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mscale_all_dim: float = 0,
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) -> None:
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# Note: we adopt the native huggingface deepseek rope initialization code from
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# https://huggingface.co/deepseek-ai/DeepSeek-V3-0324/blob/main/modeling_deepseek.py for
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# its more ascend compute friendly
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self.scaling_factor = scaling_factor
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self.extrapolation_factor = extrapolation_factor
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self.attn_factor = attn_factor
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self.beta_fast = beta_fast
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self.beta_slow = beta_slow
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# Get n-d magnitude scaling corrected for interpolation.
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self.mscale = float(
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self._yarn_get_mscale(self.scaling_factor, float(mscale)) /
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self._yarn_get_mscale(self.scaling_factor, float(mscale_all_dim)) *
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attn_factor)
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super(DeepseekScalingRotaryEmbedding,
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self).__init__(head_size, rotary_dim, max_position_embeddings,
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base, is_neox_style, dtype)
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# NOTE: For ascend friendly computing, reorder sin and cos cache
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self.max_seq_len = math.ceil(max_position_embeddings * scaling_factor)
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self._set_cos_sin_cache(self.max_seq_len,
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device=NPUPlatform.device_type,
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dtype=dtype)
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def _yarn_get_mscale(self, scale: float = 1, mscale: float = 1) -> float:
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if scale <= 1:
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return 1.0
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return 0.1 * mscale * math.log(scale) + 1.0
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def _rotate_half(self, x):
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"""Rotates half the hidden dims of the input."""
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x1 = x[..., :x.shape[-1] // 2]
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x2 = x[..., x.shape[-1] // 2:]
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return torch.cat((-x2, x1), dim=-1)
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def _yarn_linear_ramp_mask(self, min_value, max_value, dim):
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# Note: The if conditional branch is not used here
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# to solve MTP compilation error.
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max_value += (min_value == max_value).float() * 0.001
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linear_func = (torch.arange(dim, dtype=torch.float32) -
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min_value) / (max_value - min_value)
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ramp_func = torch.clamp(linear_func, 0, 1)
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return ramp_func
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# Inverse dim formula to find dim based on number of rotations
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def _yarn_find_correction_dim(self,
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num_rotations,
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dim,
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base=10000,
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max_position_embeddings=2048):
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# Note: use torch instead of math to solve MTP compilation error.
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return (dim * torch.log(
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torch.tensor(max_position_embeddings) /
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(num_rotations * 2 * torch.pi))) / (2 *
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torch.log(torch.tensor(base)))
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# Find dim range bounds based on rotations
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def _yarn_find_correction_range(self,
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low_rot,
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high_rot,
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dim,
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base=10000,
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max_position_embeddings=2048):
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# Note: use torch instead of math to solve MTP compilation error.
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low = torch.floor(
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self._yarn_find_correction_dim(low_rot, dim, base,
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max_position_embeddings))
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high = torch.ceil(
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self._yarn_find_correction_dim(high_rot, dim, base,
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max_position_embeddings))
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# Note: use torch instead of max/min to solve MTP compilation error.
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return torch.clamp(low, min=0), torch.clamp(high, max=dim - 1)
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# Copied from transformers.models.llama.modeling_llama.apply_rotary_pos_emb
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def _apply_rotary_pos_emb(self,
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q,
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k,
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cos,
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sin,
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position_ids,
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unsqueeze_dim=1):
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"""Applies Rotary Position Embedding to the query and key tensors.
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Args:
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q (`torch.Tensor`): The query tensor.
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k (`torch.Tensor`): The key tensor.
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cos (`torch.Tensor`): The cosine part of the rotary embedding.
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sin (`torch.Tensor`): The sine part of the rotary embedding.
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position_ids (`torch.Tensor`):
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The position indices of the tokens corresponding to the query and key tensors. For example, this can be
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used to pass offsetted position ids when working with a KV-cache.
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unsqueeze_dim (`int`, *optional*, defaults to 1):
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The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
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sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
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that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
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k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
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cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
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the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
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Returns:
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`tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
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"""
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cos = cos[position_ids]
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sin = sin[position_ids]
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cos = cos[:, None, None, :]
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sin = sin[:, None, None, :]
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if len(q.shape) == 3:
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q = q[:, :, None, :]
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if len(k.shape) == 2:
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k = k[:, None, None, :]
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elif len(k.shape) == 3:
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k = k[:, :, None, :]
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b, h_q, s, d = q.shape
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q = q.view(b, h_q, s, d // 2, 2).transpose(4, 3).reshape(b, h_q, s, d)
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b, h_k, s, d = k.shape
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k = k.view(b, h_k, s, d // 2, 2).transpose(4, 3).reshape(b, h_k, s, d)
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q_embed = (q * cos) + (self._rotate_half(q) * sin)
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k_embed = (k * cos) + (self._rotate_half(k) * sin)
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q_embed = q_embed.view(b, h_q, d)
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k_embed = k_embed.view(b, h_k, d)
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return q_embed, k_embed
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def _set_cos_sin_cache(self, max_seq_len, device, dtype):
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dim = self.rotary_dim
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freq_extra = 1.0 / (self.base**(
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torch.arange(0, dim, 2, dtype=torch.float32, device=device) / dim))
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freq_inter = 1.0 / (self.scaling_factor * self.base**(
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torch.arange(0, dim, 2, dtype=torch.float32, device=device) / dim))
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low, high = self._yarn_find_correction_range(
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self.beta_fast,
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self.beta_slow,
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dim,
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self.base,
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self.max_position_embeddings,
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)
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inv_freq_mask = 1.0 - self._yarn_linear_ramp_mask(
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low, high, dim // 2).to(device=device, dtype=torch.float32)
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inv_freq = freq_inter * (1 -
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inv_freq_mask) + freq_extra * inv_freq_mask
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self.register_buffer("inv_freq", inv_freq, persistent=False)
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t = torch.arange(max_seq_len, device=device, dtype=torch.float32)
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freqs = torch.outer(t, inv_freq)
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cos_cached = torch.cat([freqs, freqs], dim=-1).cos() * self.mscale
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sin_cached = torch.cat([freqs, freqs], dim=-1).sin() * self.mscale
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cos_cached = cos_cached.to(dtype)
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sin_cached = sin_cached.to(dtype)
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cache = torch.cat(
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[freqs.cos() * self.mscale,
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freqs.sin() * self.mscale], dim=-1).to(dtype)
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self.register_buffer("cos_sin_cache", cache, persistent=False)
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self.register_buffer("cos_cached", cos_cached, persistent=False)
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self.register_buffer("sin_cached", sin_cached, persistent=False)
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def forward(self,
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positions: torch.Tensor,
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query: torch.Tensor,
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key: torch.Tensor,
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offsets: Optional[torch.Tensor] = None):
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if len(key.shape) == 2:
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key = key[:, None, :]
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# Note: we implement the non neox_style method with shuffle the last dim and neox style
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# calculation method which is also more compute friendly to the ascend machine
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# https://huggingface.co/deepseek-ai/DeepSeek-V3-0324/blob/main/modeling_deepseek.py
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is_neox_style = True
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if self.is_neox_style is False:
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b, h_q, d = query.shape
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query = query.view(b, h_q, d // 2,
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2).transpose(3, 2).reshape(b, h_q, d)
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b, h_k, d = key.shape
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key = key.view(b, h_k, d // 2, 2).transpose(3,
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2).reshape(b, h_k, d)
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q_pe, k_pe = _rope_forward_oot(self, positions, query, key,
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is_neox_style, offsets)
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return q_pe, k_pe
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class AscendMRotaryEmbedding(MRotaryEmbedding):
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def forward_oot(
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self,
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positions: torch.Tensor,
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query: torch.Tensor,
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key: torch.Tensor,
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):
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if self.mrope_section != [16, 24, 24]:
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return super().forward_oot(positions, query, key)
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import torch_npu
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mrope_section = [0, 0, 0
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] if positions.ndim == 1 else self.mrope_section
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if self.cos_sin_cache.device != query.device: # type: ignore
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self.cos_sin_cache = self.cos_sin_cache.to( # type: ignore
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query.device) # type: ignore
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if self.cos_sin_cache.dtype != query.dtype: # type: ignore
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self.cos_sin_cache = self.cos_sin_cache.to( # type: ignore
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query.dtype) # type: ignore
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query, key = torch_npu.npu_mrope(positions.contiguous(),
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query.contiguous(),
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key.contiguous(),
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self.cos_sin_cache.contiguous(),
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self.head_size,
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mrope_section=mrope_section,
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rotary_mode='half')
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return query, key |