bc8e87f3db
### What this PR does / why we need it? Fixed the issue where the DCP overlaps the MTP scenario in the ds3.2 scenario. ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? cherry-pick from: https://github.com/vllm-project/vllm-ascend/pull/7617 Signed-off-by: weiguihua2 <weiguihua2@huawei.com>
1006 lines
47 KiB
Python
1006 lines
47 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 numpy as np
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import torch
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import torch.distributed as dist
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import torch.nn.functional as F
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import torch_npu
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from vllm.config import VllmConfig
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from vllm.distributed import (
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get_dcp_group,
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get_decode_context_model_parallel_rank,
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get_decode_context_model_parallel_world_size,
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get_pcp_group,
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)
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from vllm.v1.attention.backend import AttentionCGSupport
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from vllm.v1.kv_cache_interface import AttentionSpec
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from vllm_ascend.ascend_forward_context import _EXTRA_CTX
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from vllm_ascend.attention.attention_v1 import (
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AscendAttentionBackendImpl,
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AscendAttentionMetadataBuilder,
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AscendMetadata,
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)
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from vllm_ascend.attention.context_parallel.common_cp import (
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AscendMetadataForDecode,
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AscendMetadataForPrefill,
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AscendPCPMetadata,
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_npu_attention_update,
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_process_attn_out_lse,
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)
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from vllm_ascend.attention.utils import (
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AscendCommonAttentionMetadata,
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filter_chunked_req_indices,
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split_decodes_and_prefills,
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)
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from vllm_ascend.compilation.acl_graph import get_graph_params, update_graph_params_workspaces
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from vllm_ascend.utils import cp_chunkedprefill_comm_stream, weak_ref_tensors
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class AscendAttentionCPMetadataBuilder(AscendAttentionMetadataBuilder):
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"""
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Builder for constructing AscendMetadata with Context Parallelism support.
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Extends AscendAttentionMetadataBuilder with PCP/DCP metadata handling.
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"""
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def __init__(
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self,
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kv_cache_spec: AttentionSpec,
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layer_names: list[str],
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vllm_config: VllmConfig,
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device: torch.device,
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):
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super().__init__(kv_cache_spec, layer_names, vllm_config, device)
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self.pcp_size = get_pcp_group().world_size
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self.pcp_rank = get_pcp_group().rank_in_group if self.pcp_size > 1 else 0
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self.dcp_size = get_decode_context_model_parallel_world_size()
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self.dcp_rank = get_decode_context_model_parallel_rank() if self.dcp_size > 1 else 0
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@classmethod
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def get_cudagraph_support(
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cls: type["AscendAttentionCPMetadataBuilder"],
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vllm_config: VllmConfig,
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kv_cache_spec: AttentionSpec,
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) -> AttentionCGSupport:
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# Explicit override in case the underlying builder specialized this getter.
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# @override omitted only because of mypy limitation due to type variable.
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return AttentionCGSupport.ALWAYS
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def _get_chunked_req_mask(self, local_context_lens_allranks) -> list[bool]:
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"""
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given 4-d list [req][pcp][dcp], return:
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1. if each req has any chunk (list[bool])
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"""
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assert local_context_lens_allranks is not None
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if len(local_context_lens_allranks) == 0:
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return []
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chunked_req_mask = [(req.sum() > 0).item() for req in local_context_lens_allranks if req is not None]
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return chunked_req_mask
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def build(
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self,
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common_prefix_len: int,
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common_attn_metadata: AscendCommonAttentionMetadata,
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fast_build: bool = False,
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):
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num_reqs = common_attn_metadata.num_reqs
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num_actual_tokens = common_attn_metadata.num_actual_tokens
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query_start_loc_cpu = common_attn_metadata.query_start_loc_cpu[: num_reqs + 1]
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num_decodes, num_prefills, num_decode_tokens, num_prefill_tokens = split_decodes_and_prefills(
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common_attn_metadata, decode_threshold=self.decode_threshold
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)
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assert num_decodes + num_prefills == num_reqs
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assert num_decode_tokens + num_prefill_tokens == num_actual_tokens
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block_table = common_attn_metadata.block_table_tensor
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query_lens = query_start_loc_cpu[1:] - query_start_loc_cpu[:-1]
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self.num_decodes_flatten = query_lens[:num_decodes].sum().item()
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seq_lens = common_attn_metadata.seq_lens_cpu[:num_reqs]
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long_seq_metadata = common_attn_metadata.prefill_context_parallel_metadata
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num_actual_tokens_pcp_padded = long_seq_metadata.num_actual_tokens_pcp_padded if long_seq_metadata else None
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if num_actual_tokens_pcp_padded is None:
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num_actual_tokens_pcp_padded = num_actual_tokens
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slot_mapping = common_attn_metadata.slot_mapping[:num_actual_tokens_pcp_padded]
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attn_mask = self.attn_mask_builder.get_attention_mask(self.model_config)
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attn_state = common_attn_metadata.attn_state
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num_computed_tokens_cpu = seq_lens - query_lens
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query_start_loc = query_start_loc_cpu.to(self.device, non_blocking=True)
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common_long_seq_metadata = common_attn_metadata.prefill_context_parallel_metadata
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prefill_metadata = None
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decode_metadata = None
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if common_long_seq_metadata is None:
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raise AssertionError("common_long_seq_metadata should not be None.")
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num_computed_tokens_of_pcp_dcp = common_long_seq_metadata.num_computed_tokens_of_pcp_dcp
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assert num_computed_tokens_of_pcp_dcp is not None
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chunked_context_metadata = None
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attn_mask_seqlens = common_long_seq_metadata.attn_mask_seqlens
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if num_prefills > 0:
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query_lens = query_lens[num_decodes:]
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context_lens_cpu = num_computed_tokens_cpu[num_decodes:num_reqs]
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max_context_len_cpu = context_lens_cpu.max().item()
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if self.chunked_prefill_enabled and max_context_len_cpu > 0:
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if self.pcp_size > 1 and common_long_seq_metadata.pcp_use_hybrid_attn:
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query_lens = attn_mask_seqlens[0] * 2
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local_context_lens_allranks = (
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torch.tensor(num_computed_tokens_of_pcp_dcp)[self.num_decodes_flatten :]
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.to(self.device)
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.to(dtype=torch.int32)
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)
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local_chunked_kv_lens_rank = local_context_lens_allranks[:, self.pcp_rank, self.dcp_rank]
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actual_seq_lengths_kv = torch.cumsum(local_chunked_kv_lens_rank, dim=0).tolist()
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local_total_toks = local_chunked_kv_lens_rank.sum()
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chunked_req_mask = self._get_chunked_req_mask(local_context_lens_allranks)
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local_chunk_starts = torch.zeros(
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(len(local_context_lens_allranks),), dtype=torch.int32, device=self.device
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)
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# Note(qcs): we only do restore and recover for pcp, and set these vars to None
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# when only using dcp.
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if self.pcp_size > 1:
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kv_inverse_idx_for_chunk = torch.argsort(
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common_long_seq_metadata.pcp_allgather_restore_idx[self.pcp_size * num_decode_tokens :].to(
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torch.float32
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)
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)
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cp_kv_recover_idx_for_chunk = torch.argsort(kv_inverse_idx_for_chunk)
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else:
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kv_inverse_idx_for_chunk = None
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cp_kv_recover_idx_for_chunk = None
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chunk_seq_mask_filtered_indices = filter_chunked_req_indices(query_lens, chunked_req_mask).to(
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self.device
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)
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chunked_context_metadata = AscendMetadataForPrefill.ChunkedContextMetadata(
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actual_chunk_seq_lengths=torch.cumsum(query_lens * self.pcp_size, dim=0),
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actual_seq_lengths_kv=actual_seq_lengths_kv,
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chunked_req_mask=chunked_req_mask,
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starts=local_chunk_starts,
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local_context_lens_allranks=local_context_lens_allranks,
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cp_kv_recover_idx_for_chunk=cp_kv_recover_idx_for_chunk,
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kv_inverse_idx_for_chunk=kv_inverse_idx_for_chunk,
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chunk_seq_mask_filtered_indices=chunk_seq_mask_filtered_indices,
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local_total_toks=local_total_toks.item(),
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)
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head_attn_nomask_seqlens = common_long_seq_metadata.head_attn_nomask_seqlens
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tail_attn_nomask_seqlens = common_long_seq_metadata.tail_attn_nomask_seqlens
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if self.pcp_size > 1:
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attn_mask_seqlens = torch.cumsum(attn_mask_seqlens[0], dim=0).tolist()
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head_attn_nomask_seqlens = torch.cumsum(head_attn_nomask_seqlens[1], dim=0).tolist()
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tail_attn_nomask_seqlens = torch.cumsum(tail_attn_nomask_seqlens[1], dim=0).tolist()
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pcp_metadata = AscendPCPMetadata(
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q_head_idx=common_long_seq_metadata.q_head_idx_tensor,
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q_tail_idx=common_long_seq_metadata.q_tail_idx_tensor,
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kv_with_q_head_nomask_idx=common_long_seq_metadata.kv_with_q_head_nomask_idx_tensor,
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kv_with_q_head_mask_idx=common_long_seq_metadata.kv_with_q_head_mask_idx_tensor,
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kv_with_q_tail_nomask_idx=common_long_seq_metadata.kv_with_q_tail_nomask_idx_tensor,
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kv_with_q_tail_mask_idx=common_long_seq_metadata.kv_with_q_tail_mask_idx_tensor,
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attn_mask_seqlens=attn_mask_seqlens,
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head_attn_nomask_seqlens=head_attn_nomask_seqlens,
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tail_attn_nomask_seqlens=tail_attn_nomask_seqlens,
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q_full_idx=common_long_seq_metadata.q_full_idx,
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pcp_use_hybrid_attn=common_long_seq_metadata.pcp_use_hybrid_attn,
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pcp_unpad_mask=common_long_seq_metadata.pcp_unpad_mask,
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pcp_allgather_restore_idx=common_long_seq_metadata.pcp_allgather_restore_idx,
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pcp_fa_query_idx=common_long_seq_metadata.pcp_fa_query_idx,
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pcp_padded_tokens_fla=common_long_seq_metadata.pcp_padded_tokens_fla,
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pcp_enter_fa_restore_idx=common_long_seq_metadata.pcp_enter_fa_restore_idx,
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)
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prefill_metadata = AscendMetadataForPrefill(
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pcp_metadata=pcp_metadata,
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pcp_exit_fa_scatter_idx=common_long_seq_metadata.pcp_exit_fa_scatter_idx,
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chunked_context=chunked_context_metadata,
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block_tables=block_table[self.num_decodes_flatten :, ...],
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actual_seq_lengths_q=torch.cumsum(query_lens, dim=0),
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)
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if num_decodes > 0:
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num_computed_tokens_array = np.array(num_computed_tokens_of_pcp_dcp)
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num_computed_tokens_array = num_computed_tokens_array[: self.num_decodes_flatten]
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# TODO: numpy array mode of the shared memory is used to improve performance
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decode_metadata = AscendMetadataForDecode(
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num_computed_tokens_of_pcp_dcp=num_computed_tokens_array,
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block_tables=block_table[: self.num_decodes_flatten],
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)
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attn_metadata = AscendMetadata(
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num_actual_tokens=num_actual_tokens,
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num_decode_tokens=num_decode_tokens,
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num_actual_tokens_pcp_padded=num_actual_tokens_pcp_padded,
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num_decodes_flatten=self.num_decodes_flatten,
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block_tables=block_table,
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query_start_loc=query_start_loc,
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seq_lens=seq_lens,
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seq_lens_cpu=seq_lens,
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seq_lens_list=seq_lens.tolist(),
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max_query_len=common_attn_metadata.max_query_len,
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actual_seq_lengths_q=query_start_loc_cpu[1:].tolist(),
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slot_mapping=slot_mapping,
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attn_mask=attn_mask,
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attn_state=attn_state,
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num_prefills=num_prefills,
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num_decodes=num_decodes,
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prefill=prefill_metadata,
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decode_meta=decode_metadata,
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)
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return attn_metadata
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class AscendAttentionCPImpl(AscendAttentionBackendImpl):
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def __init__(
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self,
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num_heads: int,
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head_size: int,
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scale: float,
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num_kv_heads: int,
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alibi_slopes: list[float] | None,
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sliding_window: int | None,
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kv_cache_dtype: str,
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logits_soft_cap: float | None,
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attn_type: str,
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kv_sharing_target_layer_name: str | None,
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**kwargs,
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) -> None:
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super().__init__(
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num_heads,
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head_size,
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scale,
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num_kv_heads,
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alibi_slopes,
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sliding_window,
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kv_cache_dtype,
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logits_soft_cap,
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attn_type,
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kv_sharing_target_layer_name,
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**kwargs,
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)
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self.pcp_size = get_pcp_group().world_size
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self.pcp_rank = get_pcp_group().rank_in_group if self.pcp_size > 1 else 0
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self.pcp_group = get_pcp_group().device_group if self.pcp_size > 1 else None
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self.dcp_size = get_decode_context_model_parallel_world_size()
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self.dcp_rank = get_decode_context_model_parallel_rank() if self.dcp_size > 1 else 0
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self.dcp_group = get_dcp_group().device_group if self.dcp_size > 1 else None
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@staticmethod
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def update_graph_params(
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update_stream,
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forward_context,
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num_tokens,
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vllm_config=None,
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speculative_config=None,
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num_dcp_pcp_tokens=None,
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draft_attn_metadatas=None,
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):
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graph_params = get_graph_params()
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# FIXME: Behold! We are using a temporary hack here to update the args
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# for each layer's attention op in the graph.
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with torch.npu.stream(update_stream):
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for key, param, handle, event in zip(
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forward_context.attn_metadata,
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graph_params.attn_params[num_tokens],
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graph_params.handles[num_tokens],
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graph_params.events[num_tokens],
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):
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(
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q_nope,
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k_nope,
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value,
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num_heads,
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num_kv_heads,
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scale,
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block_table,
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block_size,
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actual_seq_lengths_kv,
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actual_seq_lengths_q,
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attn_output,
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softmax_lse,
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dcp_size,
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pcp_rank,
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dcp_rank,
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) = param
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attn_metadata = forward_context.attn_metadata[key]
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actual_seq_lengths_kv = attn_metadata.decode_meta.num_computed_tokens_of_pcp_dcp[:, pcp_rank, dcp_rank]
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pad_length = num_tokens - len(actual_seq_lengths_kv)
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if pad_length > 0:
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pad_tensor = np.zeros(pad_length, dtype=actual_seq_lengths_kv.dtype)
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actual_seq_lengths_kv = np.concatenate([actual_seq_lengths_kv, pad_tensor])
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actual_seq_lengths_q = attn_metadata.actual_seq_lengths_q
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if dcp_size > 1:
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num_heads = num_heads * dcp_size
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torch.npu.graph_task_update_begin(update_stream, handle)
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torch_npu.npu_fused_infer_attention_score.out(
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q_nope,
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k_nope,
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value,
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num_heads=num_heads,
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num_key_value_heads=num_kv_heads,
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input_layout="TND",
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atten_mask=None,
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scale=scale,
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antiquant_mode=0,
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antiquant_scale=None,
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softmax_lse_flag=True,
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block_table=block_table,
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block_size=block_size,
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actual_seq_lengths_kv=actual_seq_lengths_kv,
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actual_seq_lengths=actual_seq_lengths_q,
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workspace=graph_params.workspaces.get(num_tokens),
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out=[attn_output, softmax_lse],
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)
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torch.npu.graph_task_update_end(update_stream)
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event.record(update_stream)
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def _attention_with_nomask_and_mask(
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self,
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q: torch.Tensor,
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q_seqlens: list[int],
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k_nomask: torch.Tensor,
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v_nomask: torch.Tensor,
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kv_seqlens_nomask: list[int],
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k_mask: torch.Tensor,
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v_mask: torch.Tensor,
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kv_seqlens_mask: list[int],
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mask: torch.Tensor,
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attn_metadata,
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) -> torch.Tensor:
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# nomask Attention
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if k_nomask is not None:
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attn_out_nomask, attn_lse_nomask = torch.ops.npu.npu_fused_infer_attention_score(
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q,
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k_nomask,
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v_nomask,
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num_heads=self.num_heads,
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num_key_value_heads=self.num_kv_heads,
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input_layout="TND",
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atten_mask=None,
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scale=self.scale,
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sparse_mode=0,
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antiquant_mode=0,
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antiquant_scale=None,
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softmax_lse_flag=True,
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actual_seq_lengths_kv=kv_seqlens_nomask,
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actual_seq_lengths=q_seqlens,
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)
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# mask Attention
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attn_out_mask, attn_lse_mask = torch.ops.npu.npu_fused_infer_attention_score(
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q,
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k_mask,
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v_mask,
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num_heads=self.num_heads,
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num_key_value_heads=self.num_kv_heads,
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input_layout="TND",
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atten_mask=mask,
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scale=self.scale,
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sparse_mode=3,
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antiquant_mode=0,
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antiquant_scale=None,
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softmax_lse_flag=True,
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actual_seq_lengths_kv=kv_seqlens_mask,
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actual_seq_lengths=q_seqlens,
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)
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# update
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output = attn_out_mask
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attn_lse = attn_lse_mask
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|
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:
|
|
data_head, data_tail = self._forward_prefill_cp_pre(query, key, value, attn_metadata)
|
|
|
|
output_head, lse_head = self._forward_prefill_cp_attn(data_head, True, attn_metadata)
|
|
output_tail, lse_tail = self._forward_prefill_cp_attn(data_tail, False, attn_metadata)
|
|
|
|
output, attn_lse = self._forward_prefill_cp_post(
|
|
[output_head, output_tail],
|
|
[lse_head, lse_tail],
|
|
attn_metadata,
|
|
)
|
|
return output, attn_lse
|
|
|
|
def _forward_prefill_cp_pre(
|
|
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
|
|
|
|
q_head = torch.index_select(query, 0, q_head_idx)
|
|
q_tail = torch.index_select(query, 0, q_tail_idx)
|
|
k_head_nomask = torch.index_select(key, 0, kv_with_q_head_nomask_idx) if self.pcp_rank > 0 else None
|
|
v_head_nomask = torch.index_select(value, 0, kv_with_q_head_nomask_idx) if self.pcp_rank > 0 else None
|
|
k_head_mask = torch.index_select(key, 0, kv_with_q_head_mask_idx)
|
|
v_head_mask = torch.index_select(value, 0, kv_with_q_head_mask_idx)
|
|
k_tail_nomask = torch.index_select(key, 0, kv_with_q_tail_nomask_idx)
|
|
v_tail_nomask = torch.index_select(value, 0, kv_with_q_tail_nomask_idx)
|
|
k_tail_mask = torch.index_select(key, 0, kv_with_q_tail_mask_idx)
|
|
v_tail_mask = torch.index_select(value, 0, kv_with_q_tail_mask_idx)
|
|
return (
|
|
{
|
|
"q": q_head,
|
|
"k_nomask": k_head_nomask,
|
|
"v_nomask": v_head_nomask,
|
|
"k_mask": k_head_mask,
|
|
"v_mask": v_head_mask,
|
|
},
|
|
{
|
|
"q": q_tail,
|
|
"k_nomask": k_tail_nomask,
|
|
"v_nomask": v_tail_nomask,
|
|
"k_mask": k_tail_mask,
|
|
"v_mask": v_tail_mask,
|
|
},
|
|
)
|
|
|
|
def _forward_prefill_cp_attn(self, data, is_head, attn_metadata):
|
|
attn_mask_seqlens = attn_metadata.prefill.pcp_metadata.attn_mask_seqlens
|
|
nomask_seqlens = (
|
|
attn_metadata.prefill.pcp_metadata.head_attn_nomask_seqlens
|
|
if is_head
|
|
else attn_metadata.prefill.pcp_metadata.tail_attn_nomask_seqlens
|
|
)
|
|
output, lse = self._attention_with_nomask_and_mask(
|
|
**data,
|
|
q_seqlens=attn_mask_seqlens,
|
|
kv_seqlens_nomask=nomask_seqlens,
|
|
kv_seqlens_mask=attn_mask_seqlens,
|
|
mask=attn_metadata.attn_mask,
|
|
attn_metadata=attn_metadata,
|
|
)
|
|
return output, lse
|
|
|
|
def _forward_prefill_cp_post(self, outputs, lses, attn_metadata):
|
|
q_full_idx = attn_metadata.prefill.pcp_metadata.q_full_idx
|
|
output = torch.index_select(torch.cat(outputs, 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(lses, 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 _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.contiguous(), 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": torch.arange(attn_metadata.num_decodes_flatten) + 1,
|
|
}
|
|
graph_params = get_graph_params()
|
|
num_tokens = query.shape[0]
|
|
if _EXTRA_CTX.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)
|
|
attn_out_lse = _process_attn_out_lse(attn_out, attn_lse)
|
|
attn_out = _npu_attention_update(self.head_size, attn_out_lse)
|
|
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 _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.pcp_size > 1:
|
|
prefill_query = get_pcp_group().all_gather(prefill_query, 0)
|
|
prefill_query = torch.index_select(
|
|
prefill_query, 0, attn_metadata.prefill.chunked_context.cp_kv_recover_idx_for_chunk
|
|
)
|
|
if self.dcp_size > 1:
|
|
prefill_query = get_dcp_group().all_gather(prefill_query, 1)
|
|
return prefill_query
|
|
|
|
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 = prefill_metadata.chunked_context.local_total_toks
|
|
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
|
|
|
|
if total_toks == 0:
|
|
return (
|
|
torch.full(
|
|
(query.size(0), num_heads, self.head_size), fill_value=0, dtype=query.dtype, device=query.device
|
|
),
|
|
torch.full(
|
|
(query.size(0), num_heads, 1), fill_value=-torch.inf, dtype=torch.float32, device=query.device
|
|
),
|
|
)
|
|
|
|
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,
|
|
)
|
|
|
|
return prefix_chunk_output, prefix_chunk_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,
|
|
# slot offsets of current chunk in current iteration
|
|
seq_starts=attn_metadata.prefill.chunked_context.starts,
|
|
key=key,
|
|
value=value,
|
|
)
|
|
return key, value
|
|
|
|
def reshape_and_cache(
|
|
self,
|
|
query: torch.Tensor,
|
|
key: torch.Tensor,
|
|
value: torch.Tensor,
|
|
kv_cache: tuple[torch.Tensor],
|
|
attn_metadata: AscendMetadata,
|
|
output: torch.Tensor,
|
|
):
|
|
num_tokens = query.shape[0]
|
|
num_decode_tokens = attn_metadata.num_decode_tokens
|
|
has_decode = attn_metadata.num_decodes > 0
|
|
has_prefill = attn_metadata.num_prefills > 0
|
|
output_padded = output
|
|
|
|
if len(kv_cache) > 1:
|
|
if self.is_kv_producer:
|
|
attn_metadata.reshape_cache_event = torch.npu.Event()
|
|
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]
|
|
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:
|
|
assert attn_metadata.prefill is not None and attn_metadata.prefill.pcp_metadata is not None
|
|
if not attn_metadata.prefill.pcp_metadata.pcp_use_hybrid_attn:
|
|
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_metadata.pcp_allgather_restore_idx
|
|
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)
|
|
else:
|
|
query, key, value = self._gather_and_restore_pcp_qkv(query, key, value, attn_metadata)
|
|
num_actual_tokens_pcp_padded = attn_metadata.num_actual_tokens_pcp_padded
|
|
output_local_padded_tokens_fa = num_actual_tokens_pcp_padded // self.pcp_size - num_tokens
|
|
if output_local_padded_tokens_fa > 0:
|
|
output_padded = F.pad(
|
|
output, pad=(0, 0, 0, 0, 0, output_local_padded_tokens_fa), mode="constant", value=0
|
|
)
|
|
|
|
prefill_key = key[self.pcp_size * num_decode_tokens : attn_metadata.num_actual_tokens_pcp_padded]
|
|
prefill_value = value[self.pcp_size * num_decode_tokens : attn_metadata.num_actual_tokens_pcp_padded]
|
|
slot_mapping = attn_metadata.slot_mapping[
|
|
self.pcp_size * num_decode_tokens : attn_metadata.num_actual_tokens_pcp_padded
|
|
]
|
|
torch_npu._npu_reshape_and_cache(
|
|
key=prefill_key,
|
|
value=prefill_value,
|
|
key_cache=self.key_cache,
|
|
value_cache=self.value_cache,
|
|
slot_indices=slot_mapping,
|
|
)
|
|
if self.is_kv_producer:
|
|
attn_metadata.reshape_cache_event.record()
|
|
return query, key, value, output_padded
|
|
|
|
def _gather_and_restore_pcp_qkv(
|
|
self,
|
|
query: torch.Tensor,
|
|
key: torch.Tensor,
|
|
value: torch.Tensor,
|
|
attn_metadata: AscendMetadata,
|
|
):
|
|
"""
|
|
Gathers QKV chunks from all GPUs in the PCP group and restores the original
|
|
sequence order for Context Parallelism (CP).
|
|
"""
|
|
num_tokens = query.shape[0]
|
|
num_actual_tokens_pcp_padded = attn_metadata.num_actual_tokens_pcp_padded
|
|
assert attn_metadata.prefill is not None and attn_metadata.prefill.pcp_metadata is not None
|
|
pcp_padded_tokens_fla = attn_metadata.prefill.pcp_metadata.pcp_padded_tokens_fla
|
|
num_tokens_pcp_padded_fla = num_tokens + pcp_padded_tokens_fla
|
|
|
|
qkv_fla = torch.cat(
|
|
[query.reshape(num_tokens, -1), key.reshape(num_tokens, -1), value.reshape(num_tokens, -1)],
|
|
dim=-1,
|
|
)
|
|
if pcp_padded_tokens_fla > 0:
|
|
qkv_fla = F.pad(qkv_fla, pad=(0, 0, 0, pcp_padded_tokens_fla), mode="constant", value=0)
|
|
all_qkv = get_pcp_group().all_gather(qkv_fla[:num_tokens_pcp_padded_fla].contiguous(), dim=0)
|
|
|
|
# Restore the original sequence order using pre-computed indices
|
|
pcp_enter_fa_restore_idx = (
|
|
attn_metadata.prefill.pcp_metadata.pcp_enter_fa_restore_idx if attn_metadata.prefill.pcp_metadata else None
|
|
)
|
|
actual_qkv = torch.index_select(all_qkv, 0, pcp_enter_fa_restore_idx)
|
|
qkv_fa_padding_workspace = query.new_empty(
|
|
(num_actual_tokens_pcp_padded, (self.num_heads + 2 * self.num_kv_heads) * self.head_size)
|
|
)
|
|
|
|
decode_offset = attn_metadata.num_decode_tokens * self.pcp_size
|
|
qkv_fa_padding_workspace[:decode_offset] = actual_qkv[:decode_offset]
|
|
|
|
pcp_unpad_mask = attn_metadata.prefill.pcp_metadata.pcp_unpad_mask[attn_metadata.num_decodes * self.pcp_size :]
|
|
qkv_fa_padding_workspace[decode_offset:][pcp_unpad_mask] = actual_qkv[decode_offset:]
|
|
|
|
q, k, v = qkv_fa_padding_workspace.split(
|
|
[
|
|
self.num_heads * self.head_size,
|
|
self.num_kv_heads * self.head_size,
|
|
self.num_kv_heads * self.head_size,
|
|
],
|
|
dim=-1,
|
|
)
|
|
|
|
return (
|
|
q.reshape(-1, self.num_heads, self.head_size),
|
|
k.reshape(-1, self.num_kv_heads, self.head_size),
|
|
v.reshape(-1, self.num_kv_heads, self.head_size),
|
|
)
|
|
|
|
def _gather_global_context_output(self, local_context_attn_output):
|
|
if self.dcp_size > 1:
|
|
dcp_context_attn_output = torch.empty_like(local_context_attn_output)
|
|
dist.all_to_all_single(dcp_context_attn_output, local_context_attn_output, group=self.dcp_group)
|
|
else:
|
|
dcp_context_attn_output = local_context_attn_output
|
|
|
|
if self.pcp_size > 1:
|
|
# AllGather out&lse within CP group
|
|
global_context_attn_output = get_pcp_group().all_gather(dcp_context_attn_output, dim=-1)
|
|
else:
|
|
global_context_attn_output = dcp_context_attn_output
|
|
|
|
return global_context_attn_output
|
|
|
|
def _update_global_context_output(self, global_context_output):
|
|
B_total, H_total, D_plus_1 = global_context_output.shape
|
|
S = B_total // self.pcp_size
|
|
H = H_total // self.dcp_size
|
|
D = self.head_size
|
|
assert D_plus_1 == D + 1
|
|
# [PCP, S, DCP, H, D+1]
|
|
x = global_context_output.view(self.pcp_size, S, self.dcp_size, H, D_plus_1)
|
|
# [PCP, DCP, S, H, D+1]
|
|
x = x.permute(0, 2, 1, 3, 4).contiguous()
|
|
# Flatten [N, S, H, D+1], N = pcp_size * dcp_size
|
|
x = x.view(-1, S, H, D_plus_1)
|
|
# Split out lse
|
|
attn_out_allgather, attn_lse_allgather = torch.split(x, [D, 1], dim=-1) # [N, S, H, D], [N, S, H, 1]
|
|
context_output, context_lse = self._update_out_and_lse(attn_out_allgather, attn_lse_allgather)
|
|
return context_output, context_lse
|
|
|
|
def forward_impl(
|
|
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
|
|
pcp_use_hybrid_attn = False
|
|
if has_prefill:
|
|
assert attn_metadata.prefill is not None and attn_metadata.prefill.pcp_metadata is not None
|
|
pcp_use_hybrid_attn = attn_metadata.prefill.pcp_metadata.pcp_use_hybrid_attn
|
|
if has_decode:
|
|
if pcp_use_hybrid_attn:
|
|
decode_query = query[: num_decode_tokens * self.pcp_size : self.pcp_size].contiguous()
|
|
else:
|
|
decode_query = query[:num_decode_tokens].contiguous()
|
|
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
|
|
# chunked prefill vars init
|
|
has_chunked_context = attn_metadata.prefill.chunked_context is not None
|
|
# Note(qcs): we use multi-stream for computation-communication overlap
|
|
# when enabling chunked prefill.
|
|
# current part
|
|
# current_stream: init -- pre -- head attn ------------------ tail attn -- post -- update
|
|
# context part -/
|
|
# current_stream: ----- -- context attn -- -/
|
|
# COMM_STREAM: \-- all_gather Q --/ \-- a2a ag output --/
|
|
|
|
# qkv init
|
|
num_actual_tokens_pcp_padded = attn_metadata.num_actual_tokens_pcp_padded // self.pcp_size
|
|
if pcp_use_hybrid_attn:
|
|
prefill_query = query[self.pcp_size * num_decode_tokens :]
|
|
assert attn_metadata.prefill is not None and attn_metadata.prefill.pcp_metadata is not None
|
|
fa_query_idx = attn_metadata.prefill.pcp_metadata.pcp_fa_query_idx
|
|
prefill_query = torch.index_select(prefill_query, 0, fa_query_idx)
|
|
else:
|
|
prefill_query = query[num_decode_tokens:num_actual_tokens_pcp_padded].contiguous()
|
|
key = key[self.pcp_size * num_decode_tokens : attn_metadata.num_actual_tokens_pcp_padded].contiguous()
|
|
value = value[self.pcp_size * num_decode_tokens : attn_metadata.num_actual_tokens_pcp_padded].contiguous()
|
|
|
|
if has_chunked_context:
|
|
# all_gather q for chunked prefill // overlap the computation inner current chunk
|
|
cp_chunkedprefill_comm_stream().wait_stream(torch.npu.current_stream())
|
|
with torch_npu.npu.stream(cp_chunkedprefill_comm_stream()):
|
|
prefill_query_all = self._prefill_query_all_gather(attn_metadata, prefill_query.clone())
|
|
|
|
if self.pcp_size > 1:
|
|
# Scenario of Enabling PCP or PCP&DCP
|
|
# prepare qkv and compute the head part // overlap the communication of all gather q
|
|
data_head, data_tail = self._forward_prefill_cp_pre(prefill_query, key, value, attn_metadata)
|
|
output_head, lse_head = self._forward_prefill_cp_attn(data_head, True, 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,
|
|
)
|
|
|
|
if has_chunked_context:
|
|
torch.npu.current_stream().wait_stream(cp_chunkedprefill_comm_stream())
|
|
# computation of context
|
|
context_output = self._compute_prefill_context(prefill_query_all, kv_cache, attn_metadata)
|
|
# Note(qcs): (output, lse) -> [Seq, Head_num, Head_dim+1] -> [Head_num, Head_dim+1, Seq]
|
|
local_context_output = torch.cat(context_output, dim=-1).permute([1, 2, 0]).contiguous()
|
|
|
|
# all2all and all_gather output&lse // overlap the computation inner current chunk
|
|
cp_chunkedprefill_comm_stream().wait_stream(torch.npu.current_stream())
|
|
with torch_npu.npu.stream(cp_chunkedprefill_comm_stream()):
|
|
global_context_output = self._gather_global_context_output(local_context_output)
|
|
|
|
if self.pcp_size > 1:
|
|
# compute the tail part and reorg output&lse // overlap the communication of output
|
|
output_tail, lse_tail = self._forward_prefill_cp_attn(data_tail, False, attn_metadata)
|
|
|
|
attn_output_prefill, attn_lse_prefill = self._forward_prefill_cp_post(
|
|
[output_head, output_tail],
|
|
[lse_head, lse_tail],
|
|
attn_metadata,
|
|
)
|
|
|
|
if has_chunked_context:
|
|
# update the output of current chunk with context part
|
|
torch.npu.current_stream().wait_stream(cp_chunkedprefill_comm_stream())
|
|
global_context_output = global_context_output.permute([2, 0, 1]).contiguous()
|
|
context_output, context_lse = self._update_global_context_output(global_context_output)
|
|
self._update_chunk_attn_out_lse_with_current_attn_out_lse(
|
|
attn_output_prefill, attn_lse_prefill, context_output, context_lse, prefill_query, attn_metadata
|
|
)
|
|
|
|
if self.pcp_size > 1 and pcp_use_hybrid_attn:
|
|
# layer_idx != num_layers - 1
|
|
assert attn_metadata.prefill.pcp_metadata is not None
|
|
pcp_exit_fa_scatter_idx = attn_metadata.prefill.pcp_exit_fa_scatter_idx
|
|
attn_output_prefill = get_pcp_group().all_gather(attn_output_prefill.contiguous(), dim=0)
|
|
attn_output_prefill = torch.index_select(attn_output_prefill, 0, pcp_exit_fa_scatter_idx)
|
|
fla_padding = attn_output_prefill.shape[0] + num_decode_tokens - output.shape[0]
|
|
output = F.pad(output, pad=(0, 0, 0, 0, 0, fla_padding), mode="constant", value=0)
|
|
|
|
output[num_decode_tokens : attn_output_prefill.shape[0] + num_decode_tokens] = attn_output_prefill
|
|
return output
|