Ascend-SACT/Kimi-K2.5
模型介绍文件和版本Pull Requests讨论分析
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1.项目概述

本文详细介绍了Kimi-K2.5模型基于2026年4月最新发布的vllm/vllm-ascend 0.18版本以及对应的docker统一镜像3.5版本,在Ascend+X86硬件环境下基于vLLM推理引擎的部署适配指南。本指南简化了上一版本的适配流程,帮助用户与开发者通过最新镜像快速在昇腾平台开展模型部署及应用创新。

2.模型简介

Kimi-K2.5是月之暗面(Moonshot AI)于2026年1月27日正式发布并开源的原生多模态智能体旗舰模型。该模型基于Kimi-K2进行优化升级,通过约15万亿混合视觉与文本Token的预训练构建而成。模型采用1T总参数量、32B激活参数的稀疏MoE架构,配备256K上下文窗口与MoonViT视觉编码器,能够原生处理高分辨率图像与视频。

其核心优势集中在视觉编程、智能体蜂群与办公生产力三大维度。该模型可将视觉交互、视频内容转化为前端代码,能够自主指挥100个子智能体并行处理复杂任务,还能高效处理办公文档、生成专业交付物。在多项权威基准测试中,Kimi-K2.5表现突出。该模型开源且支持多平台部署,有助于开发者快速落地多模态应用创新,填补传统模型在复杂场景处理中的短板。

3.运行环境

1. 硬件环境

硬件配置规格要求
NPUAscend 910B2
CPUX86 架构
NPU 卡数16 张
适配模型Kimi-K2.5

2. 镜像与软件环境

统一镜像:ascend-docker 3.5 最新版 核心软件版本

软件名版本号
CANN8.5.1
Python3.11.15
torch2.9.0+cpu
torch_npu2.9.0
transformers5.3.0
vllm0.18.0+empty
vllm_ascend0.18.0rc1

4.拉取统一镜像(A2平台)

docker pull swr.cn-north-4.myhuaweicloud.com/ascend-sact/ascend-a2-ubuntu:latest

5.模型权重下载

modelscope download --model moonshotai/Kimi-K2.5  --local_dir xx/Kimi-K2.5

6.检查vllm和vllm-ascend版本

conda activate ascend-infer
pip list | grep vllm

查询结果vllm和vllm_ascend为以下版本即可

软件版本安装路径
vllm0.18.0+empty/workspace/vllm
vllm_ascend0.18.0rc1/workspace/vllm-ascend

说明:vllm 与 vllm_ascend 版本必须严格对应,官方已适配 Kimi-K2.5-W4A8 版,但 Kimi-K2.5 原生模型仅需小幅修改即可适配;低版本 vllm_ascend 需修改较多配置文件,推荐优先使用 vllm 与 vllm_ascend 0.18 版本。

7. 适配补丁 kimi_k25.py

针对 Ascend+X86 环境,vllm/vllm-ascend 0.18 已适配 kimi-k2.5-w4a8 量化版本,而对于 kimi-k2.5 原生版本,启动会出现如下报错: NotImplementedError: No compressed-tensors compatible scheme was found for quant_type=W4A16, layer_type=linear.

需要针对 vllm 0.18 版本的 Kimi-K2.5 模型配置文件 kimi_k25.py 进行修改适配,增加对应的 W4A16 的定义和声明。

在统一镜像 3.5 中已经默认安装了 vllm 0.18 版本,路径为 /workspace/vllm, 需要按照下面的方案修改 /workspace/vllm/vllm/model_executor/models/kimi_k25.py 文件, 请注意文件名均为小写。

方案一:手工按照以下两步修改

1. 添加导入(在第 29 行后)

# Import Ascend-specific quantization config if available
try:
    from vllm_ascend.quantization.compressed_tensors_config import AscendCompressedTensorsConfig
    _HAS_ASCEND_QUANT = True
except ImportError:
    AscendCompressedTensorsConfig = None
    _HAS_ASCEND_QUANT = False

2. 修改_maybe_ignore_quant_config方法(第405-408行)

def _maybe_ignore_quant_config(self, quant_config: QuantizationConfig):
    if isinstance(quant_config, CompressedTensorsConfig):
        return None
    # Handle Ascend-specific compressed tensors config
    try:
        from vllm_ascend.quantization.compressed_tensors_config import AscendCompressedTensorsConfig
        if isinstance(quant_config, AscendCompressedTensorsConfig):
            return None
    except ImportError:
        pass
    return quant_config

方案二:用以下代码完整替换kimi_k25.py

# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
# ruff: noqa: E501
"""
Kimi-K2.5 Model Implementation for vLLM.

Kimi-K2.5 extends Kimi-K2 with vision support

This module defines:
- KimiK25ProcessingInfo/KimiK25MultiModalProcessor: Processing logic
- KimiK25ForConditionalGeneration: Main model class
"""

from collections.abc import Iterable, Mapping, Sequence
from dataclasses import dataclass
from typing import Annotated, Any, Literal

import torch
from torch import nn
from transformers import BatchFeature
from transformers.processing_utils import ProcessorMixin

from vllm.config import VllmConfig
from vllm.config.multimodal import BaseDummyOptions
from vllm.logger import init_logger
from vllm.model_executor.layers.quantization import QuantizationConfig
from vllm.model_executor.layers.quantization.compressed_tensors.compressed_tensors import (
    CompressedTensorsConfig,
)
# Import Ascend-specific quantization config if available
try:
    from vllm_ascend.quantization.compressed_tensors_config import AscendCompressedTensorsConfig
    _HAS_ASCEND_QUANT = True
except ImportError:
    AscendCompressedTensorsConfig = None
    _HAS_ASCEND_QUANT = False

from vllm.model_executor.models.interfaces import (
    SupportsEagle,
    SupportsEagle3,
    SupportsMultiModal,
    SupportsPP,
    SupportsQuant,
)
from vllm.model_executor.models.kimi_k25_vit import (
    KimiK25MultiModalProjector,
    MoonViT3dPretrainedModel,
    vision_tower_forward,
)
from vllm.multimodal import MULTIMODAL_REGISTRY
from vllm.multimodal.inputs import (
    MultiModalDataDict,
    MultiModalFieldConfig,
    MultiModalKwargsItems,
    NestedTensors,
    VisionChunk,
    VisionChunkImage,
    VisionChunkVideo,
)
from vllm.multimodal.parse import MultiModalDataItems, VisionChunkProcessorItems
from vllm.multimodal.processing import (
    BaseDummyInputsBuilder,
    BaseMultiModalProcessor,
    BaseProcessingInfo,
    InputProcessingContext,
    PromptReplacement,
    PromptUpdate,
)
from vllm.platforms import current_platform
from vllm.sequence import IntermediateTensors
from vllm.transformers_utils.configs import KimiK25Config
from vllm.transformers_utils.processor import cached_get_image_processor
from vllm.utils.tensor_schema import TensorSchema, TensorShape

from .utils import (
    AutoWeightsLoader,
    WeightsMapper,
    init_vllm_registered_model,
    maybe_prefix,
)

logger = init_logger(__name__)


# Dummy input dimensions for profiling.
@dataclass
class MaxImageTokenMeta:
    width: int = 3000
    height: int = 3000


class KimiK25MediaPixelInputs(TensorSchema):
    """
    Media input schema for K2-VL model.

    Dimensions:
        - np: Number of patches (flattened from all media items)
        - ps: Patch size
        - nm: Number of media items
    """

    type: Literal["pixel_values"] = "pixel_values"

    pixel_values: Annotated[
        torch.Tensor | list[torch.Tensor],
        TensorShape("np", 3, "ps", "ps"),
    ]

    grid_thws: Annotated[torch.Tensor, TensorShape("nm", 3)]


class MoonshotKimiVAutoProcessor(ProcessorMixin):
    attributes = ["tokenizer"]
    tokenizer_class = "AutoTokenizer"

    def __init__(
        self, media_processor=None, tokenizer=None, media_token_id: int | None = None
    ):
        super().__init__(tokenizer)
        self.media_processor = media_processor
        self.media_token_id = media_token_id
        assert self.media_token_id is not None

    # We do not support str input for text here
    def __call__(
        self,
        vision_chunks: list[VisionChunk] | None = None,
        *,
        text: list[int] | str,
        **kwargs,
    ) -> BatchFeature:
        """
        Args:
            vision_chunks: List of VisionChunk items to be processed.
                For image: VisionChunkImage with type='image', image=PIL.Image
                For video_chunk: VisionChunkVideo with type='video_chunk', video_chunk=list[PIL.Image]
            text: The token ids to be fed to a model (required).
        Returns:
            [`BatchFeature`]: A [`BatchFeature`] with the following fields:

            - **input_ids** -- list of token ids to be fed to a model.
            - **pixel_values** -- Pixel values to be fed to a model. Returned when `vision_chunks` is not `None`.
            - **grid_thws** -- list of image 3D grid in LLM. Returned when `vision_chunks` is not `None`.
        """
        mm_inputs = {}
        input_ids = self.tokenizer.encode(text) if isinstance(text, str) else text
        if vision_chunks is not None:
            assert isinstance(vision_chunks, list)
            mm_inputs = self.media_processor.preprocess(vision_chunks)

            num_tokens_per_chunk = [
                self.media_processor.media_tokens_calculator(chunk)
                for chunk in vision_chunks
            ]

            new_input_ids = []
            for token in input_ids:
                if token == self.media_token_id:
                    new_input_ids.extend(
                        [self.media_token_id] * num_tokens_per_chunk.pop(0)
                    )
                else:
                    new_input_ids.append(token)
            input_ids = new_input_ids

        # XXX: _apply_hf_processor_text_mm will call tolist() on input_ids
        return BatchFeature(
            data={
                "input_ids": torch.tensor([input_ids]),
                **mm_inputs,
            }
        )


class KimiK25ProcessingInfo(BaseProcessingInfo):
    """Processing information for Kimi-K2.5 model.

    Provides configuration and utilities for processing both
    images and video-chunks.
    """

    def __init__(self, ctx: InputProcessingContext) -> None:
        super().__init__(ctx)
        self.hf_config = self.get_hf_config()
        self.media_token_id = self.hf_config.media_placeholder_token_id
        media_processor = cached_get_image_processor(
            self.ctx.model_config.model,
            trust_remote_code=self.ctx.model_config.trust_remote_code,
        )
        self.media_processor = media_processor
        self.hf_processor = MoonshotKimiVAutoProcessor(
            media_processor=self.media_processor,
            tokenizer=self.get_tokenizer(),
            media_token_id=self.media_token_id,
        )
        self.media_tokens_calculator = self.media_processor.media_tokens_calculator

    def get_hf_processor(self):
        return self.hf_processor

    def get_hf_config(self):
        return self.ctx.get_hf_config(KimiK25Config)

    def get_supported_mm_limits(self) -> Mapping[str, int | None]:
        # None means unlimited
        return {"vision_chunk": None}


class KimiK25DummyInputsBuilder(BaseDummyInputsBuilder[KimiK25ProcessingInfo]):
    """Builds dummy inputs for Kimi-K2.5 model profiling."""

    def __init__(self, info: KimiK25ProcessingInfo) -> None:
        super().__init__(info)
        self.media_token_id = self.info.media_token_id
        self.frame_per_chunk = self.info.media_processor.num_frames_per_chunk

    def get_dummy_text(self, mm_counts: Mapping[str, int]) -> str:
        num_media = mm_counts.get("vision_chunk", 0)
        return "<|media_pad|>" * num_media

    def get_dummy_mm_items(self):
        dummy_videos = self._get_dummy_images(
            height=MaxImageTokenMeta.height,
            width=MaxImageTokenMeta.width,
            num_images=self.frame_per_chunk,
        )

        video_chunk_dummy_item = VisionChunkVideo(
            type="video_chunk", video_chunk=dummy_videos
        )
        video_chunk_num_tokens = self.info.media_tokens_calculator(
            video_chunk_dummy_item
        )

        image_dummy_item = VisionChunkImage(
            type="image",
            image=self._get_dummy_images(
                height=MaxImageTokenMeta.height,
                width=MaxImageTokenMeta.width,
                num_images=1,
            )[0],
        )
        image_num_tokens = self.info.media_tokens_calculator(image_dummy_item)
        # return the larger one
        if video_chunk_num_tokens >= image_num_tokens:
            return [video_chunk_dummy_item]
        else:
            return [image_dummy_item]

    def get_dummy_mm_data(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
        mm_options: Mapping[str, BaseDummyOptions],
    ) -> MultiModalDataDict:
        # TODO: Support mm_options for vision_chunk to allow user configuration
        dummy_items = self.get_dummy_mm_items()
        return {"vision_chunk": dummy_items}


class KimiK25MultiModalProcessor(BaseMultiModalProcessor[KimiK25ProcessingInfo]):
    """Multi-modal processor for Kimi-K2.5.

    Handles both image and video-chunk modalities.
    """

    def _get_mm_fields_config(
        self,
        hf_inputs: BatchFeature,
        hf_processor_mm_kwargs: Mapping[str, object],
    ) -> Mapping[str, MultiModalFieldConfig]:
        """Indicates how to slice media input into multiple items.

        pixel_values: [N, 3, patch_size, patch_size], all patches collected from B medias
        grid_thws: [B,3], each item: [N_t, N_h ,N_w], indicates the grid size in time/height/width direction
                    for current item.

        by multiplying [N_t, N_h ,N_w], we get the number of patches for each media item, thus we can slice
        pixel_values by pixel_values[start:start + N_t*N_h*N_w] to get patches of one item.

        """
        grid_thws = hf_inputs.get("grid_thws", torch.empty((0, 3)))
        grid_sizes = grid_thws.prod(-1)

        return dict(
            pixel_values=MultiModalFieldConfig.flat_from_sizes(
                "vision_chunk", grid_sizes
            ),
            grid_thws=MultiModalFieldConfig.batched("vision_chunk"),
        )

    def _get_prompt_updates(
        self,
        mm_items: MultiModalDataItems,
        hf_processor_mm_kwargs: Mapping[str, Any],
        out_mm_kwargs: MultiModalKwargsItems,
    ) -> Sequence[PromptUpdate]:
        hf_config = self.info.get_hf_config()
        media_token_id = hf_config.media_placeholder_token_id

        def get_replacement(item_idx: int):
            media = mm_items.get_items("vision_chunk", (VisionChunkProcessorItems,))
            num_media_token = self.info.media_tokens_calculator(media[item_idx])
            return [media_token_id] * num_media_token

        return [
            PromptReplacement(
                modality="vision_chunk",
                target=[media_token_id],
                replacement=get_replacement,
            ),
        ]

    def split_video_chunks(self, video):
        return self.info.media_processor.split_video_chunks(video)


@MULTIMODAL_REGISTRY.register_processor(
    KimiK25MultiModalProcessor,
    info=KimiK25ProcessingInfo,
    dummy_inputs=KimiK25DummyInputsBuilder,
)
class KimiK25ForConditionalGeneration(
    nn.Module,
    SupportsMultiModal,
    SupportsPP,
    SupportsQuant,
    SupportsEagle,
    SupportsEagle3,
):
    """Kimi-K2.5 model for conditional generation.

    Supports both image and video-chunk modalities.
    Video-chunks are temporal segments (typically 4 frames) that are
    processed with temporal pooling.
    """

    supports_encoder_tp_data = True

    hf_to_vllm_mapper = WeightsMapper(
        orig_to_new_prefix={
            # For legacy NVFP4 checkpoint compatibility:
            # see https://github.com/vllm-project/vllm/pull/33346#issuecomment-3851475033
            "language_model.layers.": "language_model.model.layers.",
            # mm projector
            "mm_projector.proj.0": "mm_projector.linear_1",
            "mm_projector.proj.2": "mm_projector.linear_2",
        }
    )

    @classmethod
    def get_placeholder_str(cls, modality: str, i: int) -> str | None:
        # Kimi-K2.5 uses video_chunk for all media types
        if modality == "image":
            return "<|media_begin|>image<|media_content|><|media_pad|><|media_end|>"
        elif modality == "video":
            # return a placeholder, to be replaced in the future.
            return "<|kimi_k25_video_placeholder|>"

        raise ValueError(f"Unsupported modality: {modality}")

    def __init__(
        self,
        vllm_config: VllmConfig,
        prefix: str = "",
    ) -> None:
        super().__init__()
        model_config = vllm_config.model_config
        config: KimiK25Config = model_config.hf_config
        self.config = config
        quant_config = vllm_config.quant_config

        # Check for MoonViT config compatibility
        self.use_data_parallel = (
            model_config.multimodal_config.mm_encoder_tp_mode == "data"
        )
        self.hidden_size = config.text_config.hidden_size
        self.device = current_platform.current_device()
        # Build vision tower directly with KimiK25VisionConfig
        with self._mark_tower_model(vllm_config, "vision_chunk"):
            self.vision_tower = MoonViT3dPretrainedModel(
                config.vision_config,
                quant_config=self._maybe_ignore_quant_config(quant_config),
                prefix=maybe_prefix(prefix, "vision_tower"),
            )
            self.vision_tower = self.vision_tower.to(
                device=self.device, dtype=model_config.dtype
            )

            self.mm_projector = KimiK25MultiModalProjector(
                config=config.vision_config,
                use_data_parallel=self.use_data_parallel,
                quant_config=self._maybe_ignore_quant_config(quant_config),
                prefix=maybe_prefix(prefix, "mm_projector"),
            )
            self.mm_projector = self.mm_projector.to(
                device=self.device, dtype=model_config.dtype
            )

        self.quant_config = quant_config
        with self._mark_language_model(vllm_config):
            self.language_model = init_vllm_registered_model(
                vllm_config=vllm_config,
                hf_config=config.text_config,
                prefix=maybe_prefix(prefix, "language_model"),
                architectures=["DeepseekV2ForCausalLM"],
            )
        self.make_empty_intermediate_tensors = (
            self.language_model.make_empty_intermediate_tensors
        )
        self.media_placeholder: int = self.config.media_placeholder_token_id

    def _maybe_ignore_quant_config(self, quant_config: QuantizationConfig):
        if isinstance(quant_config, CompressedTensorsConfig):
            return None
        # Handle Ascend-specific compressed tensors config
        try:
            from vllm_ascend.quantization.compressed_tensors_config import AscendCompressedTensorsConfig
            if isinstance(quant_config, AscendCompressedTensorsConfig):
                return None
        except ImportError:
            pass
        return quant_config

    def _parse_and_validate_media_input(
        self, **kwargs: object
    ) -> KimiK25MediaPixelInputs | None:
        pixel_values = kwargs.pop("pixel_values", None)
        grid_thws = kwargs.pop("grid_thws", None)
        if pixel_values is None:
            return None

        if isinstance(pixel_values, list):
            pixel_values = torch.cat(pixel_values, dim=0)

        if len(pixel_values.shape) == 5 or len(pixel_values.shape) == 3:
            pixel_values = pixel_values.reshape(
                pixel_values.shape[0] * pixel_values.shape[1], *pixel_values.shape[2:]
            )

        # The batch dimension of pixel_values has been flattened into shape[0]
        target_dtype = next(self.vision_tower.parameters()).dtype
        pixel_values = pixel_values.to(target_dtype)
        assert isinstance(grid_thws, torch.Tensor), (
            f"expect grid_thws to be a tensor, get {type(grid_thws)}"
        )
        # In some cases (e.g. with merger), grid_thws has an extra middle dimension
        grid_thws = grid_thws.reshape(-1, grid_thws.shape[-1])
        assert grid_thws.ndim == 2 and grid_thws.size(1) == 3, (
            f"unexpected shape for grid_thws: {grid_thws.shape}"
        )

        return KimiK25MediaPixelInputs(
            type="pixel_values",
            pixel_values=pixel_values,
            grid_thws=grid_thws,
        )

    def _process_media_input(
        self, media_input: KimiK25MediaPixelInputs
    ) -> list[torch.Tensor]:
        # NOTE(moyan): This forward will automatically batch the forward pass internally
        media_features = vision_tower_forward(
            self.vision_tower,
            media_input["pixel_values"],
            media_input["grid_thws"],
            mm_projector=self.mm_projector,
            use_data_parallel=self.use_data_parallel,
        )
        return media_features

    def embed_multimodal(self, **kwargs: object) -> NestedTensors | None:
        # Validate the multimodal input keyword arguments
        media_input = self._parse_and_validate_media_input(**kwargs)
        if media_input is None:
            return None

        # Run multimodal inputs through encoder and projector
        vision_embeddings = self._process_media_input(media_input)
        return vision_embeddings

    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
        intermediate_tensors: IntermediateTensors | None = None,
        inputs_embeds: torch.Tensor | None = None,
        **kwargs: object,
    ) -> IntermediateTensors:
        if intermediate_tensors is not None:
            inputs_embeds = None
        hidden_states = self.language_model(
            input_ids=input_ids,
            positions=positions,
            intermediate_tensors=intermediate_tensors,
            inputs_embeds=inputs_embeds,
        )

        return hidden_states

    def compute_logits(self, hidden_states: torch.Tensor, **kwargs) -> torch.Tensor:
        logits = self.language_model.compute_logits(hidden_states)
        return logits

    def set_aux_hidden_state_layers(self, layers: tuple[int, ...]) -> None:
        self.language_model.set_aux_hidden_state_layers(layers)

    def get_eagle3_aux_hidden_state_layers(self) -> tuple[int, ...]:
        return self.language_model.get_eagle3_aux_hidden_state_layers()

    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]):
        loader = AutoWeightsLoader(self)
        return loader.load_weights(weights, mapper=self.hf_to_vllm_mapper)

方案三:从本项目文件中下载补丁文件并替换到环境中vllm对应文件

从本项目文件中下载kimi_k25 (for vllm18).py补丁文件,并更名为kimi_k25.py,然后替换原有vllm安装目录/vllm/model_executor/models/下的kimi_k25.py即可

8.推理执行

创建推理脚本

vi编辑infer_kimi-k2.5.sh推理脚本

export VLLM_USE_V1=1 
# 调度优化
export PYTORCH_NPU_ALLOC_CONF="expandable_segments:True"   
export TASK_QUEUE_ENABLE=1   
# 通信优化
export HCCL_BUFFSIZE=1024
export HCCL_OP_EXPANSION_MODE="AIV"
export VLLM_ASCEND_ENABLE_FLASHCOMM=0   

export VLLM_TORCH_PROFILER_WITH_STACK=0    
export VLLM_ASCEND_ENABLE_FUSED_MC2=1  
export VLLM_ASCEND_ENABLE_TOPK_OPTIMIZE=1
export VLLM_ASCEND_FUSION_OP_TRANSPOSE_KV_CACHE_BY_BLOCK=1

export HCCL_INTRA_ROCE_ENABLE=1

export CUDA_DEVICE_MAX_CONNECTIONS=1
export OMP_PROC_BIND=false
export OMP_NUM_THREADS=8

export ATB_LLM_HCCL_ENABLE=1
export ATB_OPERATION_EXECUTE_ASYNC=2
vllm serve 模型权重所在目录 \
--served-model-name kimi \
--host 0.0.0.0 \
--port 8016 \
--tensor-parallel-size 16 \
--enable-expert-parallel \
--max-num-seqs 16 \
--max-model-len 16384 \
--max-num-batched-tokens 1024 \
--trust-remote-code \
--gpu-memory-utilization 0.85 \
--enable-prefix-caching \
--additional-config '{"ascend_scheduler_config":{"enabled":true,"enable_chunked_prefill":true},"torchair_graph_config":{"enabled":true}}' \
--compilation-config  '{"cudagraph_capture_sizes":[1,2,4,8,16,32,64],"cudagraph_mode":"FULL_DECODE_ONLY"}' \
--kv-cache-dtype auto \
--seed 1024

执行推理脚本

conda activate ascend-infer
bash  infer_kimi-k2.5.sh

测试效果

curl http://0.0.0.0:8016/v1/chat/completions \
-H "Content-Type: application/json" \
-d '{
"model": "kimi",
"messages": [
        {"role": "system", "content": "You are Kimi, an AI assistant created by Moonshot AI."},
        {"role": "user", "content": [{"type": "text", "text": "请介绍一下上海"}]}
    ],
"temperature": 0.1,
"max_tokens": 256
}'