# # Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # This file is a part of the vllm-ascend project. # from dataclasses import dataclass from enum import Enum from typing import ClassVar, List, Optional, Tuple, Type import numpy as np import torch import torch.distributed as dist import torch.nn as nn import torch_npu from vllm.attention.backends.abstract import (AttentionBackend, AttentionImpl, AttentionLayer, AttentionType) from vllm.config import VllmConfig from vllm.distributed import (get_dcp_group, get_decode_context_model_parallel_rank, get_decode_context_model_parallel_world_size) from vllm.forward_context import ForwardContext, get_forward_context from vllm.utils.math_utils import cdiv from vllm.v1.attention.backends.utils import AttentionCGSupport from vllm.v1.core.sched.output import SchedulerOutput from vllm.v1.kv_cache_interface import AttentionSpec from vllm_ascend.attention.utils import (AscendCommonAttentionMetadata, filter_chunked_req_indices, split_decodes_and_prefills) from vllm_ascend.compilation.acl_graph import (get_graph_params, update_graph_params_workspaces) from vllm_ascend.utils import prefill_context_parallel_enable, weak_ref_tensors # isort: off if prefill_context_parallel_enable(): from vllm.distributed import (get_pcp_group, get_prefill_context_model_parallel_rank, get_prefill_context_model_parallel_world_size ) # isort: on from vllm.attention.backends.registry import (AttentionBackendEnum, register_backend) @register_backend(AttentionBackendEnum.CUSTOM, "ASCEND") class AscendAttentionBackend(AttentionBackend): accept_output_buffer: bool = True @staticmethod def get_name() -> str: return "CUSTOM" @staticmethod def get_impl_cls() -> Type["AscendAttentionBackendImpl"]: return AscendAttentionBackendImpl @staticmethod def get_builder_cls() -> type["AscendAttentionMetadataBuilder"]: return AscendAttentionMetadataBuilder @staticmethod def get_kv_cache_shape( num_blocks: int, block_size: int, num_kv_heads: int, head_size: int, ) -> Tuple[int, ...]: return (2, num_blocks, block_size, num_kv_heads, head_size) @staticmethod def get_bsh_kv_cache_shape( num_blocks: int, block_size: int, num_kv_heads: int, head_size: int, ) -> Tuple[int, ...]: return (2, num_blocks, block_size, num_kv_heads * head_size) @staticmethod def swap_blocks( src_kv_cache: List[torch.Tensor], dst_kv_cache: List[torch.Tensor], src_to_dst: torch.Tensor, ) -> None: src_key_cache, src_value_cache = src_kv_cache[0], src_kv_cache[1] dst_key_cache, dst_value_cache = dst_kv_cache[0], dst_kv_cache[1] src_indices = src_to_dst[:, 0] dst_indices = src_to_dst[:, 1] dst_key_cache[dst_indices] = src_key_cache[src_indices].to( dst_key_cache.device) dst_value_cache[dst_indices] = src_value_cache[src_indices].to( dst_key_cache.device) @staticmethod def copy_blocks( kv_caches: List[torch.Tensor], src_to_dists: torch.Tensor, ) -> None: src_indices = src_to_dists[:, 0] dst_indices = src_to_dists[:, 1] for kv_cache in kv_caches: key_caches = kv_cache[0] value_caches = kv_cache[1] key_caches[dst_indices] = key_caches[src_indices] value_caches[dst_indices] = value_caches[src_indices] @staticmethod def get_supported_block_size() -> list[int]: return [128] class AscendAttentionState(Enum): PrefillNoCache = 0 PrefillCacheHit = 1 DecodeOnly = 2 ChunkedPrefill = 3 SpecDecoding = 4 @dataclass class AscendPCPMetadata: q_head_idx: torch.Tensor = None q_tail_idx: torch.Tensor = None kv_with_q_head_nomask_idx: torch.Tensor = None kv_with_q_head_mask_idx: torch.Tensor = None kv_with_q_tail_nomask_idx: torch.Tensor = None kv_with_q_tail_mask_idx: torch.Tensor = None attn_mask_seqlens: torch.Tensor = None head_attn_nomask_seqlens: torch.Tensor = None tail_attn_nomask_seqlens: torch.Tensor = None q_full_idx: torch.Tensor = None pcp_prefill_mask: torch.Tensor = None @dataclass class AscendMetadataForPrefill: @dataclass class ChunkedContextMetadata: actual_chunk_seq_lengths: list[int] actual_seq_lengths_kv: list[int] starts: torch.Tensor chunk_seq_mask_filtered_indices: torch.Tensor chunked_req_mask: Optional[list[bool]] = None local_context_lens_allranks: Optional[list[list[int]]] = None cp_kv_recover_idx_for_chunk: Optional[list[int]] = None kv_inverse_idx_for_chunk: Optional[list[int]] = None batch_chunk_seq_mask: Optional[list[bool]] = None """ Prefill Specific Metadata for Ascend""" pcp_metadata: Optional[AscendPCPMetadata] = None pcp_allgather_restore_idx: Optional[List[int]] = None chunked_context: Optional[ChunkedContextMetadata] = None block_tables: torch.Tensor = None actual_seq_lengths_q: torch.Tensor = None @dataclass class AscendMetadataForDecode: """ Decode Specific Metadata for Ascend""" num_computed_tokens_of_pcp_dcp: Optional[list[list[list[int]]]] = None batch_seq_mask: torch.Tensor = None block_tables: torch.Tensor = None @dataclass class AscendMetadata: # **************************** Basic Properties ************************** # attn_mask: Optional[torch.Tensor] = None # Current state of this attention run. attn_state: AscendAttentionState = AscendAttentionState.ChunkedPrefill # Number of tokens excluding padding. num_actual_tokens_pcp_padded: int = 0 num_actual_tokens: int = 0 num_decode_tokens: int = 0 num_prefills: int = 0 num_decodes: int = 0 # The sequence length per sequence. Sequence length means the computed # tokens + new tokens (is None if it is a decoding). # (batch_size,) # TODO(Angazenn): The following parameters are quite redundant and # contains similar information (such as seq_lens seq_lens_list). We # should simplified these parameters once attention schema in vLLM-Ascend # is unified. seq_lens: torch.Tensor = None seq_lens_list: List[int] = None # type: ignore actual_seq_lengths_q: List[int] = None # type: ignore query_start_loc_list: List[int] = None # type: ignore query_start_loc: torch.Tensor = None query_lens: torch.Tensor = None # Maximum query length in the batch (None for decoding). max_query_len: Optional[int] = None # ********************** KV Cache Related Properties ********************* # # Block addresses per sequence (Seq id -> list of physical block). # (batch_size, max_blocks_per_seq) block_tables: torch.Tensor = None # The indices of the token slots that input tokens will be stored into. # E.g., if `slot_mapping` is [35, 2, 17] and the block size is 16, the # three tokens are stored in the 3rd slot in block 2, 2nd slot in block 0, # and 1st slot in block 1, respectively. # (num_tokens,) slot_mapping: torch.Tensor = None prefill: Optional[AscendMetadataForPrefill] = None decode_meta: Optional[AscendMetadataForDecode] = None class AscendAttentionMetadataBuilder: # Does this backend/builder support ACL Graphs for attention (default: no). aclgraph_support: ClassVar[AttentionCGSupport] = \ AttentionCGSupport.ALWAYS # AttentionCGSupport.UNIFORM_SINGLE_TOKEN_DECODE # Does this backend/builder reorder the batch? # If not, set this to None. Otherwise set it to the query # length that will be pulled into the front of the batch. reorder_batch_threshold: ClassVar[int] = 1 def __init__( self, kv_cache_spec: AttentionSpec, layer_names: list[str], vllm_config: VllmConfig, device: torch.device, ): self.vllm_config = vllm_config self.model_config = vllm_config.model_config self.compilation_config = vllm_config.compilation_config self.device = device self.max_num_blocks_per_req = cdiv( self.model_config.max_model_len, AscendAttentionBackend.get_supported_block_size()[0]) self.batch_seq_mask_buf = torch.empty( vllm_config.scheduler_config.max_num_batched_tokens, dtype=torch.uint8, device=device) self.pcp_size = get_prefill_context_model_parallel_world_size( ) if prefill_context_parallel_enable() else 1 self.pcp_rank = get_prefill_context_model_parallel_rank( ) if self.pcp_size > 1 else 0 self.dcp_size = get_decode_context_model_parallel_world_size() self.dcp_rank = get_decode_context_model_parallel_rank( ) if self.dcp_size > 1 else 0 self.speculative_config = vllm_config.speculative_config self.decode_threshold = 1 if self.speculative_config: spec_token_num = self.speculative_config.num_speculative_tokens self.decode_threshold += spec_token_num assert self.decode_threshold <= 16, f"decode_threshold exceeded \ npu_fused_infer_attention_score TND layout's limit of 16, \ got {self.decode_threshold}" AscendAttentionMetadataBuilder.reorder_batch_threshold = self.decode_threshold scheduler_config = vllm_config.scheduler_config self.chunked_prefill_enabled = scheduler_config.enable_chunked_prefill def reorder_batch(self, input_batch, scheduler_output: "SchedulerOutput") -> bool: return False def build( self, common_prefix_len: int, common_attn_metadata: AscendCommonAttentionMetadata, model: Optional[nn.Module] = None, ): num_reqs = common_attn_metadata.num_reqs num_actual_tokens = common_attn_metadata.num_actual_tokens query_start_loc_cpu = common_attn_metadata.query_start_loc_cpu[: num_reqs + 1] num_decodes, num_prefills, num_decode_tokens, num_prefill_tokens = \ split_decodes_and_prefills(common_attn_metadata, decode_threshold=self.decode_threshold) assert num_decodes + num_prefills == num_reqs assert num_decode_tokens + num_prefill_tokens == num_actual_tokens block_table = common_attn_metadata.block_table_tensor query_lens = query_start_loc_cpu[1:] - query_start_loc_cpu[:-1] seq_lens = common_attn_metadata.seq_lens_cpu[:num_reqs] long_seq_metadata = common_attn_metadata.prefill_context_parallel_metadata num_actual_tokens_pcp_padded = long_seq_metadata.num_actual_tokens_pcp_padded if long_seq_metadata else None if num_actual_tokens_pcp_padded is None: num_actual_tokens_pcp_padded = num_actual_tokens slot_mapping = common_attn_metadata.slot_mapping[: num_actual_tokens_pcp_padded] # slot_mapping = common_attn_metadata.slot_mapping[:num_actual_tokens] attn_mask = common_attn_metadata.attn_mask attn_state = common_attn_metadata.attn_state query_start_loc_cpu = common_attn_metadata.query_start_loc_cpu[: num_reqs + 1] num_computed_tokens_cpu = (seq_lens - query_lens) if common_attn_metadata.num_input_tokens > num_actual_tokens: padded_num_tokens = common_attn_metadata.num_input_tokens - num_actual_tokens seq_lens = torch.cat([ seq_lens, torch.tensor([padded_num_tokens ]).to(seq_lens.device).to(seq_lens.dtype) ]) block_table_padding = torch.zeros( (padded_num_tokens, ) + block_table.shape[1:], dtype=block_table.dtype, device=block_table.device) block_table = torch.cat([block_table, block_table_padding], dim=0) query_start_loc_cpu = torch.cat([ query_start_loc_cpu, torch.tensor([query_start_loc_cpu[-1] + padded_num_tokens]).to( query_start_loc_cpu.device).to(query_start_loc_cpu.dtype) ]) query_start_loc = query_start_loc_cpu.to(self.device, non_blocking=True) common_long_seq_metadata = common_attn_metadata.prefill_context_parallel_metadata prefill_metadata = None decode_metadata = None if common_long_seq_metadata is not None: num_computed_tokens_of_pcp_dcp = common_long_seq_metadata.num_computed_tokens_of_pcp_dcp assert num_computed_tokens_of_pcp_dcp is not None chunked_context_metadata = None if num_prefills > 0: query_lens = query_lens[num_decode_tokens:] context_lens_cpu = num_computed_tokens_cpu[ num_decodes:num_reqs] max_context_len_cpu = context_lens_cpu.max().item() pcp_size = get_prefill_context_model_parallel_world_size( ) if prefill_context_parallel_enable() else 1 if self.chunked_prefill_enabled and max_context_len_cpu > 0: local_context_lens_allranks = torch.tensor( num_computed_tokens_of_pcp_dcp )[num_decodes:num_reqs].to( self.device).to(dtype=torch.int32) local_chunked_kv_lens_rank = local_context_lens_allranks[:, self . pcp_rank, self . dcp_rank] actual_seq_lengths_kv = torch.cumsum( local_chunked_kv_lens_rank, dim=0).tolist() chunked_req_mask = self._get_chunked_req_mask( local_context_lens_allranks) local_chunk_starts = torch.zeros( (len(local_context_lens_allranks)), dtype=torch.int32, device=self.device) cp_kv_recover_idx_for_chunk = common_long_seq_metadata.cp_kv_recover_idx_for_chunk kv_inverse_idx_for_chunk = torch.argsort( cp_kv_recover_idx_for_chunk.to(torch.float32) ) if cp_kv_recover_idx_for_chunk is not None else None batch_chunk_seq_mask = ( local_context_lens_allranks[:, self.pcp_rank, self.dcp_rank] == 0) batch_chunk_seq_mask = torch.repeat_interleave( batch_chunk_seq_mask, repeats=(query_lens * self.pcp_size).to(self.device)) chunk_seq_mask_filtered_indices = filter_chunked_req_indices( query_lens, chunked_req_mask).to(self.device) chunked_context_metadata = \ AscendMetadataForPrefill.ChunkedContextMetadata( actual_chunk_seq_lengths=torch.cumsum(query_lens * pcp_size, dim=0), actual_seq_lengths_kv=actual_seq_lengths_kv, chunked_req_mask=chunked_req_mask, starts=local_chunk_starts, local_context_lens_allranks=local_context_lens_allranks, cp_kv_recover_idx_for_chunk=cp_kv_recover_idx_for_chunk, kv_inverse_idx_for_chunk=kv_inverse_idx_for_chunk, batch_chunk_seq_mask=batch_chunk_seq_mask, chunk_seq_mask_filtered_indices=chunk_seq_mask_filtered_indices ) attn_mask_seqlens = common_long_seq_metadata.attn_mask_seqlens head_attn_nomask_seqlens = common_long_seq_metadata.head_attn_nomask_seqlens tail_attn_nomask_seqlens = common_long_seq_metadata.tail_attn_nomask_seqlens if pcp_size > 1: attn_mask_seqlens = torch.cumsum(attn_mask_seqlens[0], dim=0).tolist() head_attn_nomask_seqlens = torch.cumsum( head_attn_nomask_seqlens[1], dim=0).tolist() tail_attn_nomask_seqlens = torch.cumsum( tail_attn_nomask_seqlens[1], dim=0).tolist() pcp_metadata = AscendPCPMetadata( q_head_idx=common_long_seq_metadata.q_head_idx_tensor, q_tail_idx=common_long_seq_metadata.q_tail_idx_tensor, kv_with_q_head_nomask_idx=common_long_seq_metadata. kv_with_q_head_nomask_idx_tensor, kv_with_q_head_mask_idx=common_long_seq_metadata. kv_with_q_head_mask_idx_tensor, kv_with_q_tail_nomask_idx=common_long_seq_metadata. kv_with_q_tail_nomask_idx_tensor, kv_with_q_tail_mask_idx=common_long_seq_metadata. kv_with_q_tail_mask_idx_tensor, attn_mask_seqlens=attn_mask_seqlens, head_attn_nomask_seqlens=head_attn_nomask_seqlens, tail_attn_nomask_seqlens=tail_attn_nomask_seqlens, q_full_idx=common_long_seq_metadata.q_full_idx, pcp_prefill_mask=common_long_seq_metadata.pcp_prefill_mask) prefill_metadata = AscendMetadataForPrefill( pcp_metadata=pcp_metadata, pcp_allgather_restore_idx=common_long_seq_metadata. pcp_allgather_restore_idx if common_long_seq_metadata is not None else None, chunked_context=chunked_context_metadata, block_tables=block_table[num_decodes:], actual_seq_lengths_q=torch.cumsum(query_lens, dim=0)) if num_decodes > 0: num_computed_tokens_array = np.array( num_computed_tokens_of_pcp_dcp) num_computed_tokens_array = num_computed_tokens_array[: num_decodes] batch_seq_mask = ( num_computed_tokens_array[:, self.pcp_rank, self.dcp_rank] == 0) # TODO: numpy array mode of the shared memory is used to improve performance self.batch_seq_mask_buf[:batch_seq_mask.shape[0]].copy_( torch.from_numpy(batch_seq_mask), non_blocking=True) decode_metadata = AscendMetadataForDecode( num_computed_tokens_of_pcp_dcp=num_computed_tokens_array, batch_seq_mask=self.batch_seq_mask_buf[:batch_seq_mask. shape[0]], block_tables=block_table[:num_decodes]) attn_metadata = AscendMetadata( num_actual_tokens=num_actual_tokens, num_decode_tokens=num_decode_tokens, num_actual_tokens_pcp_padded=num_actual_tokens_pcp_padded, block_tables=block_table, query_start_loc=query_start_loc, query_start_loc_list=query_start_loc_cpu[1:].tolist(), query_lens=query_lens, seq_lens=seq_lens, seq_lens_list=seq_lens.tolist(), max_query_len=common_attn_metadata.max_query_len, actual_seq_lengths_q=query_start_loc_cpu[1:].tolist(), slot_mapping=slot_mapping, attn_mask=attn_mask, attn_state=attn_state, num_prefills=num_prefills, num_decodes=num_decodes, prefill=prefill_metadata, decode_meta=decode_metadata) return attn_metadata def _get_chunked_req_mask(self, local_context_lens_allranks) -> List[bool]: """ given 4-d list [req][pcp][dcp], return: 1. if each req has any chunk (list[bool]) """ assert local_context_lens_allranks is not None if len(local_context_lens_allranks) == 0: return [] chunked_req_mask = [(req.sum() > 0).item() for req in local_context_lens_allranks if req is not None] return chunked_req_mask def build_for_graph_capture( self, common_attn_metadata: AscendCommonAttentionMetadata, attn_state: AscendAttentionState = AscendAttentionState.DecodeOnly, model: Optional[nn.Module] = None, ): if attn_state == AscendAttentionState.DecodeOnly: attn_metadata = self.build( common_prefix_len=0, common_attn_metadata=common_attn_metadata, ) else: raise NotImplementedError( "Currently we only support building dummy metadata for DecodeOnly state" ) attn_metadata.attn_state = attn_state return attn_metadata class AscendAttentionBackendImpl(AttentionImpl): def __init__( self, num_heads: int, head_size: int, scale: float, num_kv_heads: int, alibi_slopes: Optional[List[float]], sliding_window: Optional[int], kv_cache_dtype: str, logits_soft_cap: Optional[float], attn_type: str, kv_sharing_target_layer_name: Optional[str], **kwargs, ) -> None: self.num_heads = num_heads self.head_size = head_size self.scale = float(scale) self.num_kv_heads = num_heads if num_kv_heads is None else num_kv_heads self.hidden_size = self.num_heads * self.head_size self.kv_cache_dtype = kv_cache_dtype self.sliding_window = sliding_window if alibi_slopes is not None: alibi_slopes = torch.tensor(alibi_slopes, dtype=torch.float32, device="npu") self.alibi_slopes = alibi_slopes self.attn_type = attn_type assert self.num_heads % self.num_kv_heads == 0 self.num_queries_per_kv = self.num_heads // self.num_kv_heads self.key_cache = None self.value_cache = None self.pcp_size = get_prefill_context_model_parallel_world_size( ) if prefill_context_parallel_enable() else 1 self.pcp_rank = get_prefill_context_model_parallel_rank( ) if self.pcp_size > 1 else 0 self.pcp_group = get_pcp_group( ).device_group if self.pcp_size > 1 else None self.dcp_size = get_decode_context_model_parallel_world_size() self.dcp_rank = get_decode_context_model_parallel_rank( ) if self.dcp_size > 1 else 0 self.dcp_group = get_dcp_group( ).device_group if self.dcp_size > 1 else None def full_graph_attention(self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, kv_cache: Tuple[torch.Tensor], attn_metadata: AscendMetadata, output: torch.Tensor, num_tokens=0): if self.pcp_size * self.dcp_size > 1: attn_output = self._forward_pcp_dcp(query, key, value, kv_cache, attn_metadata, output) return attn_output, query.shape[0] elif attn_metadata.attn_state == AscendAttentionState.PrefillNoCache: block_size = 128 block_table = None actual_seq_lengths_kv = attn_metadata.query_start_loc_list elif attn_metadata.attn_state == \ AscendAttentionState.PrefillCacheHit: batch_size = attn_metadata.query_lens.shape[0] block_table = attn_metadata.block_tables[:batch_size, :] num_block, block_size, _, _ = self.key_cache.shape # type: ignore key = self.key_cache.view( # type: ignore num_block, block_size, -1) value = self.value_cache.view( # type: ignore num_block, block_size, -1) actual_seq_lengths_kv = attn_metadata.seq_lens_list elif attn_metadata.attn_state == AscendAttentionState.DecodeOnly: num_block, block_size, _, _ = self.key_cache.shape # type: ignore key = self.key_cache.view( # type: ignore num_block, block_size, -1) value = self.value_cache.view( # type: ignore num_block, block_size, -1) block_table = attn_metadata.block_tables actual_seq_lengths_kv = attn_metadata.seq_lens_list # Normal V1 situation. else: num_block, block_size, _, _ = self.key_cache.shape # type: ignore key = self.key_cache.view( # type: ignore num_block, block_size, -1) value = self.value_cache.view( # type: ignore num_block, block_size, -1) block_table = attn_metadata.block_tables actual_seq_lengths_kv = attn_metadata.seq_lens_list num_tokens = attn_metadata.query_start_loc_list[-1] graph_params = get_graph_params() query_start_loc = attn_metadata.query_start_loc_list # Prepare tensors for attention output # TODO: Refactor this to step-level instead of layer-level # Get workspace from cache or calculate it if not present. workspace = graph_params.workspaces.get(num_tokens) softmax_lse = torch.empty(1, dtype=query.dtype, device=query.device) if workspace is None: workspace = torch_npu._npu_fused_infer_attention_score_get_max_workspace( query=query, key=key, value=value, atten_mask=attn_metadata.attn_mask, block_table=block_table, input_layout="TND", block_size=block_size, actual_seq_lengths=query_start_loc, actual_seq_lengths_kv=actual_seq_lengths_kv, num_key_value_heads=self.num_kv_heads, num_heads=self.num_heads, sparse_mode=3, scale=self.scale, ) update_graph_params_workspaces(num_tokens, workspace) # Handle graph capturing mode stream = torch_npu.npu.current_stream() event = torch.npu.ExternalEvent() event.wait(stream) event.reset(stream) graph_params.events[num_tokens].append(event) graph_params.attn_params[num_tokens].append( (weak_ref_tensors(query), weak_ref_tensors(key), weak_ref_tensors(value), weak_ref_tensors(block_table), weak_ref_tensors(attn_metadata.attn_mask), block_size, actual_seq_lengths_kv, query_start_loc, self.num_kv_heads, self.num_heads, self.scale, weak_ref_tensors(output), weak_ref_tensors(softmax_lse))) torch.npu.graph_task_group_begin(stream) torch_npu.npu_fused_infer_attention_score.out( query=query, key=key, value=value, atten_mask=attn_metadata.attn_mask, block_table=block_table, input_layout="TND", block_size=block_size, actual_seq_lengths=query_start_loc, actual_seq_lengths_kv=actual_seq_lengths_kv, num_key_value_heads=self.num_kv_heads, num_heads=self.num_heads, scale=self.scale, sparse_mode=3, workspace=workspace, out=[output, softmax_lse], ) output = output.view(num_tokens, self.num_heads, self.head_size) handle = torch.npu.graph_task_group_end(stream) graph_params.handles[num_tokens].append(handle) return output, num_tokens def _forward_prefill(self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, attn_metadata: AscendMetadata, output: torch.Tensor): if attn_metadata.attn_state == AscendAttentionState.PrefillNoCache: block_size = 128 block_table = None actual_seq_lengths_kv = attn_metadata.actual_seq_lengths_q elif attn_metadata.attn_state == \ AscendAttentionState.PrefillCacheHit: batch_size = attn_metadata.query_lens.shape[0] block_table = attn_metadata.block_tables[:batch_size, :] num_block, block_size, _, _ = self.key_cache.shape # type: ignore key = self.key_cache.view( # type: ignore num_block, block_size, -1) value = self.value_cache.view( # type: ignore num_block, block_size, -1) actual_seq_lengths_kv = attn_metadata.seq_lens_list # chunked_prefill. else: num_block, block_size, _, _ = self.key_cache.shape # type: ignore key = self.key_cache.view( # type: ignore num_block, block_size, -1) value = self.value_cache.view( # type: ignore num_block, block_size, -1) block_table = attn_metadata.block_tables actual_seq_lengths_kv = attn_metadata.seq_lens_list num_tokens = attn_metadata.actual_seq_lengths_q[-1] query = query[:num_tokens] # Prepare tensors for attention output # TODO: Refactor this to step-level instead of layer-level # Get workspace from cache or calculate it if not present. attn_output, _ = torch_npu.npu_fused_infer_attention_score( query=query, key=key, value=value, atten_mask=attn_metadata.attn_mask, block_table=block_table, input_layout="TND", block_size=block_size, actual_seq_lengths=attn_metadata.actual_seq_lengths_q, actual_seq_lengths_kv=actual_seq_lengths_kv, num_key_value_heads=self.num_kv_heads, num_heads=self.num_heads, scale=self.scale, sparse_mode=3, ) attn_output = attn_output.view(num_tokens, self.num_heads, self.head_size) output[:num_tokens] = attn_output[:num_tokens] return output def _forward_decode_only( self, query: torch.Tensor, attn_metadata: AscendMetadata, output: Optional[torch.Tensor] = None, ) -> torch.Tensor: if self.sliding_window is not None and attn_metadata.seq_lens.shape[ 0] == query.size(0): batch_size = attn_metadata.seq_lens.shape[0] block_size = 128 query = query.view(batch_size, 1, self.num_heads * self.head_size) key = self.key_cache value = self.value_cache if self.key_cache is not None and self.value_cache is not None: block_size = self.key_cache.shape[1] key = self.key_cache.flatten(2, 3).contiguous() value = self.value_cache.flatten(2, 3).contiguous() output, _ = torch_npu.npu_fused_infer_attention_score( query, key, value, num_heads=self.num_heads, num_key_value_heads=self.num_kv_heads, input_layout="BSH", block_size=block_size, pre_tokens=self.sliding_window, scale=self.scale, block_table=attn_metadata.block_tables, actual_seq_lengths=[1] * len(attn_metadata.seq_lens), actual_seq_lengths_kv=attn_metadata.seq_lens) output = output.view(batch_size, self.num_heads, self.head_size) else: torch_npu._npu_paged_attention( query=query, key_cache=self.key_cache, value_cache=self.value_cache, num_kv_heads=self.num_kv_heads, num_heads=self.num_heads, scale_value=self.scale, block_table=attn_metadata.block_tables, context_lens=attn_metadata.seq_lens, out=output) return output def _attention_with_nomask_and_mask(self, q: torch.Tensor, q_seqlens: List[int], k_nomask: torch.Tensor, v_nomask: torch.Tensor, kv_seqlens_nomask: List[int], k_mask: torch.Tensor, v_mask: torch.Tensor, kv_seqlens_mask: List[int], mask: torch.Tensor, attn_metadata) -> torch.Tensor: # nomask Attention if k_nomask is not None: attn_out_nomask, attn_lse_nomask = torch.ops.npu.npu_fused_infer_attention_score( q, k_nomask, v_nomask, num_heads=self.num_heads, num_key_value_heads=self.num_kv_heads, input_layout="TND", atten_mask=None, scale=self.scale, sparse_mode=0, antiquant_mode=0, antiquant_scale=None, softmax_lse_flag=True, actual_seq_lengths_kv=kv_seqlens_nomask, actual_seq_lengths=q_seqlens) # mask Attention attn_out_mask, attn_lse_mask = torch.ops.npu.npu_fused_infer_attention_score( q, k_mask, v_mask, num_heads=self.num_heads, num_key_value_heads=self.num_kv_heads, input_layout="TND", atten_mask=mask, scale=self.scale, sparse_mode=3, antiquant_mode=0, antiquant_scale=None, softmax_lse_flag=True, actual_seq_lengths_kv=kv_seqlens_mask, actual_seq_lengths=q_seqlens) # update output = attn_out_mask attn_lse = attn_lse_mask if k_nomask is not None: if attn_metadata.prefill is not None and attn_metadata.prefill.chunked_context is None: output = self._npu_attn_out_lse_update(attn_lse_mask, attn_lse_nomask, attn_out_mask, attn_out_nomask) attn_lse = None else: output, attn_lse = self._update_out_and_lse( torch.stack([attn_out_nomask, attn_out_mask], dim=0), torch.stack([attn_lse_nomask, attn_lse_mask], dim=0)) return output, attn_lse def _npu_attn_out_lse_update(self, attn_lse_mask, attn_lse_nomask, attn_out_mask, attn_out_nomask): T = attn_out_mask.shape[0] N = attn_out_mask.shape[1] D = attn_out_mask.shape[2] attn_out_mask, attn_lse_mask = self._out_lse_reshape( attn_out_mask, attn_lse_mask) attn_out_nomask, attn_lse_nomask = self._out_lse_reshape( attn_out_nomask, attn_lse_nomask) attn_out_mask = attn_out_mask.to(torch.float32) attn_out_nomask = attn_out_nomask.to(torch.float32) attn_lse_mask = attn_lse_mask.to(torch.float32) attn_lse_nomask = attn_lse_nomask.to(torch.float32) attn_output = [attn_out_nomask, attn_out_mask] attn_lse = [attn_lse_nomask, attn_lse_mask] update_type = 0 output, _ = torch_npu.npu_attention_update(attn_lse, attn_output, update_type) output = output.view(T, N, D) return output def _forward_prefill_cp(self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, attn_metadata: AscendMetadata) -> torch.Tensor: assert attn_metadata is not None assert attn_metadata.prefill is not None assert attn_metadata.prefill.pcp_metadata is not None # Use precomputed indices from the metadata (already converted to tensors and on device) q_head_idx = attn_metadata.prefill.pcp_metadata.q_head_idx q_tail_idx = attn_metadata.prefill.pcp_metadata.q_tail_idx kv_with_q_head_nomask_idx = attn_metadata.prefill.pcp_metadata.kv_with_q_head_nomask_idx kv_with_q_head_mask_idx = attn_metadata.prefill.pcp_metadata.kv_with_q_head_mask_idx kv_with_q_tail_nomask_idx = attn_metadata.prefill.pcp_metadata.kv_with_q_tail_nomask_idx kv_with_q_tail_mask_idx = attn_metadata.prefill.pcp_metadata.kv_with_q_tail_mask_idx attn_mask_seqlens = attn_metadata.prefill.pcp_metadata.attn_mask_seqlens head_attn_nomask_seqlens = attn_metadata.prefill.pcp_metadata.head_attn_nomask_seqlens tail_attn_nomask_seqlens = attn_metadata.prefill.pcp_metadata.tail_attn_nomask_seqlens mask = attn_metadata.prefill.pcp_metadata.pcp_prefill_mask # 1. Attention calculation in the first half of Q in load balancing output_heads, lse_heads = self._attention_with_nomask_and_mask( q=torch.index_select(query, 0, q_head_idx), q_seqlens=attn_mask_seqlens, k_nomask=torch.index_select(key, 0, kv_with_q_head_nomask_idx) if self.pcp_rank > 0 else None, v_nomask=torch.index_select(value, 0, kv_with_q_head_nomask_idx) if self.pcp_rank > 0 else None, kv_seqlens_nomask=head_attn_nomask_seqlens, k_mask=torch.index_select(key, 0, kv_with_q_head_mask_idx), v_mask=torch.index_select(value, 0, kv_with_q_head_mask_idx), kv_seqlens_mask=attn_mask_seqlens, mask=mask, attn_metadata=attn_metadata) # 2. the Attention calculation in the latter half of Q in load balancing # pcp_rank0: Q3*KV0~KV2 + Q3*KV3 # pcp_rank1: Q2*KV0~KV1 + Q2*KV2 output_tails, lse_tails = self._attention_with_nomask_and_mask( q=torch.index_select(query, 0, q_tail_idx), q_seqlens=attn_mask_seqlens, k_nomask=torch.index_select(key, 0, kv_with_q_tail_nomask_idx), v_nomask=torch.index_select(value, 0, kv_with_q_tail_nomask_idx), kv_seqlens_nomask=tail_attn_nomask_seqlens, k_mask=torch.index_select(key, 0, kv_with_q_tail_mask_idx), v_mask=torch.index_select(value, 0, kv_with_q_tail_mask_idx), kv_seqlens_mask=attn_mask_seqlens, mask=mask, attn_metadata=attn_metadata) q_full_idx = attn_metadata.prefill.pcp_metadata.q_full_idx output = torch.index_select( torch.cat([output_heads, output_tails], dim=0), 0, q_full_idx) attn_lse = None if attn_metadata.prefill is not None and attn_metadata.prefill.chunked_context is not None: attn_lse = torch.index_select( torch.cat([lse_heads, lse_tails], dim=0), 0, q_full_idx) return output, attn_lse def _out_lse_reshape(self, attn_out: torch.Tensor, attn_lse: torch.Tensor) -> torch.Tensor: attn_out = attn_out.contiguous().view( attn_out.shape[0] * attn_out.shape[1], attn_out.shape[2]) attn_lse = attn_lse.contiguous().view( attn_lse.shape[0] * attn_lse.shape[1] * attn_lse.shape[2]) return attn_out, attn_lse def _npu_attention_update( self, attn_out_lse_list: List[torch.Tensor]) -> torch.Tensor: update_type = 0 batch = attn_out_lse_list[0].shape[0] num_heads = attn_out_lse_list[0].shape[1] head_dim = attn_out_lse_list[0].shape[2] - 1 attn_out_split_cp = [] attn_lse_split_cp = [] for i in attn_out_lse_list: attn_out_allgather, attn_lse_allgather = self._out_lse_reshape( *torch.split(i, [self.head_size, 1], dim=-1)) attn_out_split_cp.append(attn_out_allgather) attn_lse_split_cp.append(attn_lse_allgather) attn_out, attn_lse = torch_npu.npu_attention_update( attn_lse_split_cp, attn_out_split_cp, update_type) attn_out = attn_out.view(batch, num_heads, head_dim) return attn_out def _forward_decode_pcp_dcp(self, query: torch.Tensor, attn_metadata: AscendMetadata) -> torch.Tensor: assert self.key_cache is not None assert self.value_cache is not None if self.dcp_size > 1: query = get_dcp_group().all_gather(query, 1) num_heads = self.num_heads * self.dcp_size else: num_heads = self.num_heads k_nope = self.key_cache.view(self.key_cache.shape[0], self.key_cache.shape[1], -1) value = self.value_cache.view(self.key_cache.shape[0], self.key_cache.shape[1], -1) common_kwargs = { 'num_heads': num_heads, 'num_key_value_heads': self.num_kv_heads, 'input_layout': 'TND', 'atten_mask': None, 'scale': self.scale, 'antiquant_mode': 0, 'antiquant_scale': None, 'softmax_lse_flag': True, 'block_table': attn_metadata.decode_meta.block_tables, 'block_size': self.key_cache.shape[1], 'actual_seq_lengths_kv': attn_metadata.decode_meta. num_computed_tokens_of_pcp_dcp[:, self.pcp_rank, self.dcp_rank], 'actual_seq_lengths': attn_metadata.actual_seq_lengths_q[:attn_metadata.num_decodes], } graph_params = get_graph_params() forward_context: ForwardContext = get_forward_context() num_tokens = query.shape[0] if forward_context.capturing: stream = torch_npu.npu.current_stream() event = torch.npu.ExternalEvent() event.wait(stream) event.reset(stream) graph_params.events[num_tokens].append(event) workspace = graph_params.workspaces.get(num_tokens) if workspace is None: workspace = torch_npu._npu_fused_infer_attention_score_get_max_workspace( query, k_nope, value, **common_kwargs) update_graph_params_workspaces(num_tokens, weak_ref_tensors(workspace)) attn_out = torch.empty_like(query) attn_lse = torch.empty((num_tokens, num_heads, 1), dtype=torch.float, device=query.device) graph_params.attn_params[num_tokens].append(( weak_ref_tensors(query), weak_ref_tensors(k_nope), weak_ref_tensors(value), self.num_heads, self.num_kv_heads, self.scale, attn_metadata.block_tables, self.key_cache.shape[1], attn_metadata.decode_meta. num_computed_tokens_of_pcp_dcp[:, self.pcp_rank, self.dcp_rank], attn_metadata.actual_seq_lengths_q[:attn_metadata.num_decodes], weak_ref_tensors(attn_out), weak_ref_tensors(attn_lse), self.dcp_size, self.pcp_rank, self.dcp_rank)) torch.npu.graph_task_group_begin(stream) torch_npu.npu_fused_infer_attention_score.out( query, k_nope, value, **common_kwargs, workspace=workspace, out=[attn_out, attn_lse]) handle = torch.npu.graph_task_group_end(stream) graph_params.handles[num_tokens].append(handle) else: attn_out, attn_lse = torch_npu.npu_fused_infer_attention_score( query, k_nope, value, **common_kwargs) out_mask = attn_metadata.decode_meta.batch_seq_mask[:, None, None].expand_as( attn_out) attn_out = torch.where(out_mask, 0, attn_out) lse_mask = attn_metadata.decode_meta.batch_seq_mask[:, None, None].expand_as( attn_lse) attn_lse = torch.where(lse_mask, -torch.inf, attn_lse) attn_out_lse_list = [] # Concat out&lse: [bs,num_heads,v_head_dim] + [bs,num_heads,1] -> [bs,num_heads,v_head_dim+1] attn_out_lse = torch.cat([attn_out, attn_lse], dim=-1) if self.dcp_size > 1: # permute: [bs, num_heads, v_head_dim+1] -> [num_heads, v_head_dim+1, bs] attn_out_lse = attn_out_lse.permute([1, 2, 0]).contiguous() attn_out_lse_all2all = torch.empty_like(attn_out_lse) dist.all_to_all_single(attn_out_lse_all2all, attn_out_lse, group=self.dcp_group) # permute: [num_heads, v_head_dim+1, bs] -> [bs, num_heads, v_head_dim+1] attn_out_lse_all2all = attn_out_lse_all2all.permute([2, 0, 1]) if self.pcp_size > 1: attn_out_lse = attn_out_lse_all2all.contiguous() attn_out_lse_list = list( torch.chunk(attn_out_lse_all2all, self.dcp_size, dim=1)) if self.pcp_size > 1: # AllGather out&lse within CP group attn_out_lse_list = [ torch.empty_like(attn_out_lse) for _ in range(self.pcp_size) ] dist.all_gather(attn_out_lse_list, attn_out_lse, group=self.pcp_group) if self.dcp_size > 1 and self.pcp_size > 1: attn_out_lse_list_pcp_dcp = [] for s in attn_out_lse_list: attn_out_lse_list_split = list( torch.chunk(s, self.dcp_size, dim=1)) attn_out_lse_list_pcp_dcp += attn_out_lse_list_split attn_out_lse_list = attn_out_lse_list_pcp_dcp # Update out&lse attn_out = self._npu_attention_update(attn_out_lse_list) return attn_out def _update_out_and_lse(self, out_list: torch.Tensor, lse_list: torch.Tensor) -> torch.Tensor: """LSE_final = log(sum(exp(LSE_i))), O_final = sum(exp(LSE_i - LSE_final) * O_i) Args: out_list: shape = [N, batch_size, num_heads, head_size] lse_list: shape = [N, batch_size, num_heads, 1] Returns: out_final: shape = [batch_size, num_heads, head_size] lse_final: shape = [batch_size, num_heads, 1] """ lse_final = torch.logsumexp(lse_list, dim=0, keepdim=False) out_final = torch.sum(torch.exp(lse_list - lse_final) * out_list, dim=0) return out_final, lse_final def _forward_pcp_dcp(self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, kv_cache: Tuple[torch.Tensor], attn_metadata: AscendMetadata, output: torch.Tensor) -> torch.Tensor: assert attn_metadata is not None has_decode = attn_metadata.num_decodes > 0 has_prefill = attn_metadata.num_prefills > 0 num_decode_tokens = attn_metadata.num_decode_tokens if has_decode: decode_query = query[:num_decode_tokens] output_decode = self._forward_decode_pcp_dcp( decode_query, attn_metadata) output[:num_decode_tokens] = output_decode if has_prefill: assert attn_metadata.prefill is not None num_actual_tokens_pcp_padded = attn_metadata.num_actual_tokens_pcp_padded // self.pcp_size prefill_query = query[ num_decode_tokens:num_actual_tokens_pcp_padded] key = key[self.pcp_size * num_decode_tokens:] value = value[self.pcp_size * num_decode_tokens:] if self.pcp_size > 1: # Scenario of Enabling PCP or PCP&DCP attn_output_prefill, attn_lse_prefill = self._forward_prefill_cp( prefill_query, key, value, attn_metadata) else: # Scenario of Enabling DCP Individually attn_output_prefill, attn_lse_prefill = torch.ops.npu.npu_fused_infer_attention_score( prefill_query, key, value, num_heads=self.num_heads, num_key_value_heads=self.num_kv_heads, input_layout="TND", atten_mask=attn_metadata.attn_mask, scale=self.scale, sparse_mode=3, antiquant_mode=0, antiquant_scale=None, softmax_lse_flag=True, actual_seq_lengths_kv=attn_metadata.prefill. actual_seq_lengths_q, actual_seq_lengths=attn_metadata.prefill. actual_seq_lengths_q) self._process_chunk_prefill(attn_output_prefill, attn_lse_prefill, kv_cache, prefill_query, attn_metadata) output[num_decode_tokens:attn_output_prefill.shape[0] + num_decode_tokens] = attn_output_prefill return output def _process_chunk_prefill(self, current_attn_output_prefill, current_attn_lse_prefill, kv_cache, prefill_query, attn_metadata): if attn_metadata.prefill is not None and attn_metadata.prefill.chunked_context is not None: prefill_query_all = self._prefill_query_all_gather( attn_metadata, prefill_query) attn_output_full_chunk, attn_lse_full_chunk = self._compute_prefill_context( prefill_query_all, kv_cache, attn_metadata) self._update_chunk_attn_out_lse_with_current_attn_out_lse( current_attn_output_prefill, current_attn_lse_prefill, attn_output_full_chunk, attn_lse_full_chunk, prefill_query, attn_metadata) def _update_chunk_attn_out_lse_with_current_attn_out_lse( self, current_attn_output_prefill, current_attn_lse_prefill, attn_output_full_chunk, attn_lse_full_chunk, prefill_query, attn_metadata): if self.pcp_size > 1: inverse_idx = attn_metadata.prefill.chunked_context.kv_inverse_idx_for_chunk attn_output_full_chunk = torch.index_select( attn_output_full_chunk, 0, inverse_idx) attn_lse_full_chunk = torch.index_select(attn_lse_full_chunk, 0, inverse_idx) num_tokens = prefill_query.size(0) attn_output_full_chunk = attn_output_full_chunk[ self.pcp_rank * num_tokens:(self.pcp_rank + 1) * num_tokens, :, :] attn_lse_full_chunk = attn_lse_full_chunk[ self.pcp_rank * num_tokens:(self.pcp_rank + 1) * num_tokens, :, :] assert attn_output_full_chunk.shape == current_attn_output_prefill.shape and attn_lse_full_chunk.shape == current_attn_lse_prefill.shape filtered_indices = attn_metadata.prefill.chunked_context.chunk_seq_mask_filtered_indices attn_output_prefill_filtered = current_attn_output_prefill[ filtered_indices, :, :] attn_lse_prefill_filtered = current_attn_lse_prefill[ filtered_indices, :, :] attn_output_full_chunk = attn_output_full_chunk[filtered_indices, :, :] attn_lse_full_chunk = attn_lse_full_chunk[filtered_indices, :, :] attn_output_filtered = self._npu_attn_out_lse_update( attn_lse_prefill_filtered, attn_lse_full_chunk, attn_output_prefill_filtered, attn_output_full_chunk) current_attn_output_prefill[ filtered_indices, :, :] = attn_output_filtered.to( current_attn_output_prefill.dtype) def _prefill_query_all_gather(self, attn_metadata, prefill_query): if self.dcp_size > 1: prefill_query = get_dcp_group().all_gather(prefill_query, 1) if self.pcp_size > 1: prefill_query = get_pcp_group().all_gather(prefill_query, 0) prefill_query_all = torch.index_select(prefill_query, 0, attn_metadata.prefill.chunked_context.cp_kv_recover_idx_for_chunk) \ if self.pcp_size > 1 else prefill_query return prefill_query_all def _compute_prefill_context(self, query: torch.Tensor, kv_cache: Tuple[torch.Tensor], attn_metadata: AscendMetadata): assert len(kv_cache) > 1 assert attn_metadata is not None assert attn_metadata.prefill is not None assert attn_metadata.prefill.chunked_context is not None prefill_metadata = attn_metadata.prefill local_chunked_kv_lens = prefill_metadata.chunked_context.local_context_lens_allranks assert local_chunked_kv_lens is not None local_chunked_kv_lens_rank = local_chunked_kv_lens[:, self.pcp_rank, self.dcp_rank] total_toks = local_chunked_kv_lens_rank.sum() key, value = self._load_kv_for_chunk(attn_metadata, kv_cache, local_chunked_kv_lens_rank, query, total_toks) if self.dcp_size > 1: num_heads = self.num_heads * self.dcp_size else: num_heads = self.num_heads prefix_chunk_output = torch.full( (query.size(0), num_heads, self.head_size), fill_value=0, dtype=query.dtype, device=query.device) prefix_chunk_lse = torch.full((query.size(0), num_heads, 1), fill_value=-torch.inf, dtype=torch.float32, device=query.device) if total_toks > 0: prefix_chunk_output, prefix_chunk_lse = torch.ops.npu.npu_fused_infer_attention_score( query, key, value, num_heads=num_heads, num_key_value_heads=self.num_kv_heads, input_layout="TND", atten_mask=None, scale=self.scale, sparse_mode=0, antiquant_mode=0, antiquant_scale=None, softmax_lse_flag=True, actual_seq_lengths_kv=prefill_metadata.chunked_context. actual_seq_lengths_kv, actual_seq_lengths=attn_metadata.prefill.chunked_context. actual_chunk_seq_lengths) batch_chunk_seq_mask = attn_metadata.prefill.chunked_context.batch_chunk_seq_mask out_mask = batch_chunk_seq_mask[:, None, None].expand_as( prefix_chunk_output) prefix_chunk_output = torch.where(out_mask, 0, prefix_chunk_output) lse_mask = batch_chunk_seq_mask[:, None, None].expand_as(prefix_chunk_lse) prefix_chunk_lse = torch.where(lse_mask, -torch.inf, prefix_chunk_lse) prefix_output, prefix_lse = self._update_chunk_attn_out_lse( prefix_chunk_output, prefix_chunk_lse) return prefix_output, prefix_lse def _update_chunk_attn_out_lse(self, prefix_chunk_output, prefix_chunk_lse): # CP dimension all_gather and fusion chunk_attn_out_lse = torch.cat([prefix_chunk_output, prefix_chunk_lse], dim=-1) if self.dcp_size > 1: chunk_attn_out_lse = chunk_attn_out_lse.permute([1, 2, 0]).contiguous() attn_out_lse_all2all = torch.empty_like(chunk_attn_out_lse) dist.all_to_all_single(attn_out_lse_all2all, chunk_attn_out_lse, group=self.dcp_group) attn_out_lse_all2all = attn_out_lse_all2all.permute([2, 0, 1]) if self.pcp_size > 1: chunk_attn_out_lse = attn_out_lse_all2all.contiguous() attn_out_lse_list = list( torch.chunk(attn_out_lse_all2all, self.dcp_size, dim=1)) if self.pcp_size > 1: attn_out_lse_list = [ torch.empty_like(chunk_attn_out_lse) for _ in range(self.pcp_size) ] dist.all_gather(attn_out_lse_list, chunk_attn_out_lse, group=self.pcp_group) if self.dcp_size > 1 and self.pcp_size > 1: attn_out_lse_list_pcp_dcp = [] for s in attn_out_lse_list: attn_out_lse_list_split = list( torch.chunk(s, self.dcp_size, dim=1)) attn_out_lse_list_pcp_dcp += attn_out_lse_list_split attn_out_lse_list = attn_out_lse_list_pcp_dcp attn_out_lse_allgather = torch.stack( attn_out_lse_list, dim=0) # [pcp, batch_size, num_heads, head_size+1] attn_out_allgather, attn_lse_allgather = torch.split( attn_out_lse_allgather, [self.head_size, 1], dim=-1) prefix_output, prefix_lse = self._update_out_and_lse( attn_out_allgather, attn_lse_allgather) return prefix_output, prefix_lse def _load_kv_for_chunk(self, attn_metadata, kv_cache, local_chunked_kv_lens_rank, query, total_toks): cache_key = kv_cache[0] cache_value = kv_cache[1] num_heads = cache_key.size(2) head_size = kv_cache[0].size(-1) key = torch.empty(total_toks, num_heads, head_size, dtype=query.dtype, device=query.device) value = torch.empty(total_toks, num_heads, head_size, dtype=query.dtype, device=query.device) if total_toks > 0: torch_npu.atb.npu_paged_cache_load( cache_key, cache_value, attn_metadata.prefill.block_tables, local_chunked_kv_lens_rank, seq_starts=attn_metadata.prefill.chunked_context. starts, # slot offsets of current chunk in current iteration key=key, value=value, ) return key, value def _forward_encode( self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, attn_metadata: AscendMetadata, output: torch.Tensor, ) -> torch.Tensor: cum_seq_len = attn_metadata.query_start_loc[1:].tolist() output = torch_npu.npu_fusion_attention( query, key, value, head_num=self.num_heads, input_layout="TND", scale=self.scale, sparse_mode=4, atten_mask=attn_metadata.attn_mask, pre_tockens=attn_metadata.max_query_len, next_tockens=attn_metadata.max_query_len, actual_seq_qlen=cum_seq_len, actual_seq_kvlen=cum_seq_len, )[0] return output def forward( self, layer: AttentionLayer, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor, kv_cache: Tuple[torch.Tensor], attn_metadata: AscendMetadata, output: Optional[torch.Tensor] = None, output_scale: Optional[torch.Tensor] = None, output_block_scale: Optional[torch.Tensor] = None, ) -> torch.Tensor: """Forward pass with Ascend attention. Args: query: shape = [num_tokens, num_heads, head_size] key: shape = [num_tokens, num_kv_heads, head_size] value: shape = [num_tokens, num_kv_heads, head_size] kv_cache: shape = [2, num_blocks, block_size, num_kv_heads, head_size] attn_metadata: Metadata for attention. Returns: shape = [num_tokens, num_heads * head_size] """ assert output is not None, "Output tensor must be provided." if output_scale is not None or output_block_scale is not None: raise NotImplementedError( "fused output quantization is not yet supported" " for AscendAttentionBackendImpl") assert layer._k_scale_float == 1.0 and layer._v_scale_float == 1.0 if self.attn_type != AttentionType.DECODER and self.attn_type != AttentionType.ENCODER_ONLY: raise NotImplementedError("Encoder/decoder cross-attention " "are not implemented for " "PallasAttentionBackendImpl") num_tokens = query.shape[0] if attn_metadata is None: return output.fill_(0) num_decode_tokens = attn_metadata.num_decode_tokens has_decode = attn_metadata.num_decodes > 0 has_prefill = attn_metadata.num_prefills > 0 if len(kv_cache) > 1: if self.key_cache is None: self.key_cache, self.value_cache = kv_cache[0], kv_cache[1] if has_decode: slot_mapping = attn_metadata.slot_mapping[:num_decode_tokens * self.pcp_size: self.pcp_size] \ if self.pcp_size * self.dcp_size > 1 else attn_metadata.slot_mapping[:num_decode_tokens] torch_npu._npu_reshape_and_cache( key=key[:num_decode_tokens], value=value[:num_decode_tokens], key_cache=self.key_cache, value_cache=self.value_cache, slot_indices=slot_mapping) if has_prefill: if self.pcp_size > 1: kv = torch.cat([key, value], dim=-1) num_actual_tokens_pcp_padded = attn_metadata.num_actual_tokens_pcp_padded // self.pcp_size all_kv = get_pcp_group().all_gather( kv[:num_actual_tokens_pcp_padded].contiguous(), dim=0) pcp_allgather_restore_idx = attn_metadata.prefill.pcp_allgather_restore_idx if attn_metadata.prefill else None all_kv = torch.index_select(all_kv, 0, pcp_allgather_restore_idx) key, value = all_kv.split([self.head_size, self.head_size], dim=-1) torch_npu._npu_reshape_and_cache( key=key[self.pcp_size * num_decode_tokens:attn_metadata. num_actual_tokens_pcp_padded], value=value[self.pcp_size * num_decode_tokens:attn_metadata. num_actual_tokens_pcp_padded], key_cache=self.key_cache, value_cache=self.value_cache, slot_indices=attn_metadata. slot_mapping[self.pcp_size * num_decode_tokens:attn_metadata. num_actual_tokens_pcp_padded]) forward_context: ForwardContext = get_forward_context() if not forward_context.capturing: if self.pcp_size * self.dcp_size > 1: attn_output = self._forward_pcp_dcp(query, key, value, kv_cache, attn_metadata, output) output[:num_tokens] = attn_output[:num_tokens] return output if self.attn_type == AttentionType.ENCODER_ONLY: attn_output = self._forward_encode(query, key, value, attn_metadata, output) output[:num_tokens] = attn_output[:num_tokens] return output if attn_metadata.attn_state == AscendAttentionState.DecodeOnly: output = self._forward_decode_only(query, attn_metadata, output) else: output = self._forward_prefill(query, key, value, attn_metadata, output) else: attn_output, num_tokens = self.full_graph_attention( query, key, value, kv_cache, attn_metadata, output) output[:num_tokens] = attn_output[:num_tokens] return output