fe91ce9591
Signed-off-by: amirk <amirk@ai21.com> Signed-off-by: asafg <asafg@ai21.com> Co-authored-by: asafg <asafg@ai21.com> Co-authored-by: Asaf Joseph Gardin <39553475+Josephasafg@users.noreply.github.com>
84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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from dataclasses import dataclass
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from typing import ClassVar, Optional
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import torch
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from vllm.attention.backends.abstract import AttentionBackend
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from vllm.config import VllmConfig
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from vllm.v1.attention.backends.utils import (AttentionMetadataBuilder,
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CommonAttentionMetadata,
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split_decodes_and_prefills)
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from vllm.v1.kv_cache_interface import AttentionSpec, MambaSpec
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class Mamba1AttentionBackend(AttentionBackend):
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@staticmethod
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def get_builder_cls() -> type["Mamba1AttentionMetadataBuilder"]:
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return Mamba1AttentionMetadataBuilder
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@dataclass
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class Mamba1AttentionMetadata:
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query_start_loc: torch.Tensor
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context_lens_tensor: torch.Tensor
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state_indices_tensor: torch.Tensor
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has_initial_states: Optional[torch.Tensor]
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num_prefills: int
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num_prefill_tokens: int
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num_decodes: int
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num_decode_tokens: int
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class Mamba1AttentionMetadataBuilder(
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AttentionMetadataBuilder[Mamba1AttentionMetadata]):
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reorder_batch_threshold: ClassVar[int] = 1
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def __init__(
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self,
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kv_cache_spec: AttentionSpec,
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vllm_config: VllmConfig,
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device: torch.device,
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layer_names: list[str],
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):
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assert isinstance(kv_cache_spec, MambaSpec)
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self.kv_cache_spec = kv_cache_spec
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self.device = device
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self.vllm_config = vllm_config
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self.layer_names = layer_names
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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: CommonAttentionMetadata,
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fast_build: bool = False,
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) -> Mamba1AttentionMetadata:
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query_start_loc = common_attn_metadata.query_start_loc
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state_indices_tensor = common_attn_metadata.block_table_tensor[:, 0]
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context_lens_tensor = common_attn_metadata.num_computed_tokens_cpu.to(
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query_start_loc.device)
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num_decodes, num_prefills, num_decode_tokens, num_prefill_tokens = (
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split_decodes_and_prefills(common_attn_metadata,
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decode_threshold=1))
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has_initial_states = None
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if num_prefills > 0:
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has_initial_states = context_lens_tensor > 0
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return Mamba1AttentionMetadata(
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query_start_loc=query_start_loc,
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context_lens_tensor=context_lens_tensor,
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has_initial_states=has_initial_states,
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state_indices_tensor=state_indices_tensor,
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num_prefills=num_prefills,
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num_prefill_tokens=num_prefill_tokens,
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num_decodes=num_decodes,
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num_decode_tokens=num_decode_tokens,
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)
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