qwen3_vl.py 79 KB
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# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

# Copyright 2025 The vLLM team.
# Copyright 2025 The Qwen Team.
# Copyright 2025 The HuggingFace Inc. team.
# All rights reserved.
#
# This code is based on EleutherAI's GPT-NeoX library and the GPT-NeoX
# and OPT implementations in this library. It has been modified from its
# original forms to accommodate minor architectural differences compared
# to GPT-NeoX and OPT used by the Meta AI team that trained the model.
#
# 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.
"""Inference-only Qwen3VL model compatible with HuggingFace weights."""
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from collections.abc import Callable, Iterable, Iterator, Mapping, Sequence
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from functools import lru_cache, partial
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from itertools import islice
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from typing import Any
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import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
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from transformers import BatchFeature
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from transformers.models.qwen2_vl import Qwen2VLImageProcessorFast
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from transformers.models.qwen2_vl.image_processing_qwen2_vl import (
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    smart_resize as image_smart_resize,
)
from transformers.models.qwen3_vl import Qwen3VLProcessor, Qwen3VLVideoProcessor
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from transformers.models.qwen3_vl.configuration_qwen3_vl import (
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    Qwen3VLConfig,
    Qwen3VLVisionConfig,
)
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from transformers.models.qwen3_vl.video_processing_qwen3_vl import (
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    smart_resize as video_smart_resize,
)
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from transformers.video_utils import VideoMetadata

from vllm.compilation.decorators import support_torch_compile
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from vllm.config import VllmConfig
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from vllm.config.multimodal import BaseDummyOptions, VideoDummyOptions
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from vllm.distributed import get_pp_group
from vllm.logger import init_logger
from vllm.model_executor.layers.activation import _ACTIVATION_REGISTRY
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from vllm.model_executor.layers.conv import Conv3dLayer
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from vllm.model_executor.layers.linear import (
    ColumnParallelLinear,
    RowParallelLinear,
)
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from vllm.model_executor.layers.logits_processor import LogitsProcessor
from vllm.model_executor.layers.quantization import QuantizationConfig
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from vllm.model_executor.layers.rotary_embedding import get_rope
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from vllm.model_executor.layers.vocab_parallel_embedding import ParallelLMHead
from vllm.model_executor.model_loader.weight_utils import default_weight_loader
from vllm.model_executor.models.module_mapping import MultiModelKeys
from vllm.multimodal import MULTIMODAL_REGISTRY
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from vllm.multimodal.evs import (
    compute_mrope_for_media,
    compute_retained_tokens_count,
    compute_retention_mask,
    recompute_mrope_positions,
)
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from vllm.multimodal.inputs import (
    MultiModalDataDict,
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    MultiModalFeatureSpec,
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    MultiModalFieldConfig,
    MultiModalKwargsItem,
    MultiModalKwargsItems,
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    PlaceholderRange,
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    VideoItem,
)
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from vllm.multimodal.parse import ImageSize, MultiModalDataItems
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from vllm.multimodal.processing import (
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    BaseDummyInputsBuilder,
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    BaseMultiModalProcessor,
    PromptReplacement,
    PromptUpdate,
    PromptUpdateDetails,
)
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from vllm.sequence import IntermediateTensors
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from vllm.utils.collection_utils import is_list_of
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from vllm.utils.math_utils import round_up
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from vllm.v1.attention.backends.registry import AttentionBackendEnum
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from .interfaces import (
    MultiModalEmbeddings,
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    SupportsEagle3,
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    SupportsLoRA,
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    SupportsMRoPE,
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    SupportsMultiModal,
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    SupportsMultiModalPruning,
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    SupportsPP,
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    _require_is_multimodal,
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)
from .qwen2_5_vl import (
    Qwen2_5_VisionAttention,
    Qwen2_5_VLImageEmbeddingInputs,
    Qwen2_5_VLImageInputs,
    Qwen2_5_VLImagePixelInputs,
    Qwen2_5_VLVideoEmbeddingInputs,
    Qwen2_5_VLVideoInputs,
    Qwen2_5_VLVideoPixelInputs,
)
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from .qwen2_vl import (
    Qwen2VLMultiModalDataParser,
    Qwen2VLProcessingInfo,
    _create_qwen2vl_field_factory,
)
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from .qwen3 import Qwen3ForCausalLM, Qwen3Model
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from .utils import (
    AutoWeightsLoader,
    PPMissingLayer,
    WeightsMapper,
    _merge_multimodal_embeddings,
    maybe_prefix,
)
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from .vision import (
    get_vit_attn_backend,
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    is_vit_use_data_parallel,
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    run_dp_sharded_mrope_vision_model,
)
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logger = init_logger(__name__)

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# We use 2048 dummy video frames that would generate vision embeddings
# of the maximum size.
DUMMY_VIDEO_NUM_FRAMES = 2048
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class Qwen3_VisionPatchEmbed(nn.Module):
    def __init__(
        self,
        patch_size: int = 14,
        temporal_patch_size: int = 2,
        in_channels: int = 3,
        hidden_size: int = 1152,
    ) -> None:
        super().__init__()
        self.patch_size = patch_size
        self.temporal_patch_size = temporal_patch_size
        self.hidden_size = hidden_size

        kernel_size = (temporal_patch_size, patch_size, patch_size)
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        self.proj = Conv3dLayer(
            in_channels,
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            hidden_size,
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            kernel_size=kernel_size,
            stride=kernel_size,
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            bias=True,
        )
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    def forward(self, x: torch.Tensor) -> torch.Tensor:
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        L, C = x.shape
        x = x.view(L, -1, self.temporal_patch_size, self.patch_size, self.patch_size)
        x = self.proj(x).view(L, self.hidden_size)
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        return x


class Qwen3_VisionMLP(nn.Module):
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    def __init__(
        self,
        in_features: int,
        hidden_features: int,
        bias: bool = False,
        act_fn: Callable[[torch.Tensor], torch.Tensor] = F.silu,
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        quant_config: QuantizationConfig | None = None,
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        prefix: str = "",
    ):
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        super().__init__()
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        use_data_parallel = is_vit_use_data_parallel()
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        self.linear_fc1 = ColumnParallelLinear(
            in_features,
            hidden_features,
            bias=bias,
            quant_config=quant_config,
            return_bias=False,
            prefix=f"{prefix}.linear_fc1",
            disable_tp=use_data_parallel,
        )
        self.linear_fc2 = RowParallelLinear(
            hidden_features,
            in_features,
            bias=bias,
            quant_config=quant_config,
            return_bias=False,
            prefix=f"{prefix}.linear_fc2",
            disable_tp=use_data_parallel,
        )
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        self.act_fn = act_fn

    def forward(self, x: torch.Tensor):
        mlp_output = self.linear_fc2(self.act_fn(self.linear_fc1(x)))
        return mlp_output


class Qwen3_VisionBlock(nn.Module):
    def __init__(
        self,
        dim: int,
        num_heads: int,
        mlp_hidden_dim: int,
        act_fn: Callable[[torch.Tensor], torch.Tensor] = F.silu,
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        norm_layer: Callable[[int], nn.Module] | None = None,
        quant_config: QuantizationConfig | None = None,
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        prefix: str = "",
    ) -> None:
        super().__init__()
        if norm_layer is None:
            norm_layer = partial(nn.LayerNorm, eps=1e-6)
        self.norm1 = norm_layer(dim)
        self.norm2 = norm_layer(dim)
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        self.attn = Qwen2_5_VisionAttention(
            embed_dim=dim,
            num_heads=num_heads,
            projection_size=dim,
            quant_config=quant_config,
            prefix=f"{prefix}.attn",
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        )
        self.mlp = Qwen3_VisionMLP(
            dim,
            mlp_hidden_dim,
            act_fn=act_fn,
            bias=True,
            quant_config=quant_config,
            prefix=f"{prefix}.mlp",
        )
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    def forward(
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        self,
        x: torch.Tensor,
        cu_seqlens: torch.Tensor,
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        rotary_pos_emb_cos: torch.Tensor,
        rotary_pos_emb_sin: torch.Tensor,
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        max_seqlen: torch.Tensor,  # Only used for Flash Attention
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    ) -> torch.Tensor:
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        x = x + self.attn(
            self.norm1(x),
            cu_seqlens=cu_seqlens,
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            rotary_pos_emb_cos=rotary_pos_emb_cos,
            rotary_pos_emb_sin=rotary_pos_emb_sin,
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            max_seqlen=max_seqlen,
        )
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        x = x + self.mlp(self.norm2(x))
        return x


class Qwen3_VisionPatchMerger(nn.Module):
    def __init__(
        self,
        d_model: int,
        context_dim: int,
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        norm_layer: Callable[[int], nn.Module] | None = None,
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        spatial_merge_size: int = 2,
        use_postshuffle_norm: bool = False,
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        quant_config: QuantizationConfig | None = None,
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        prefix: str = "",
    ) -> None:
        super().__init__()
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        use_data_parallel = is_vit_use_data_parallel()
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        self.hidden_size = context_dim * (spatial_merge_size**2)

        self.use_postshuffle_norm = use_postshuffle_norm
        if self.use_postshuffle_norm:
            context_dim = self.hidden_size

        if norm_layer is None:
            norm_layer = partial(nn.LayerNorm, eps=1e-6)
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        self.norm = norm_layer(context_dim)
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        self.linear_fc1 = ColumnParallelLinear(
            self.hidden_size,
            self.hidden_size,
            bias=True,
            quant_config=quant_config,
            prefix=f"{prefix}.linear_fc1",
            disable_tp=use_data_parallel,
        )
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        self.act_fn = nn.GELU()
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        self.linear_fc2 = RowParallelLinear(
            self.hidden_size,
            d_model,
            bias=True,
            quant_config=quant_config,
            prefix=f"{prefix}.linear_fc2",
            disable_tp=use_data_parallel,
        )
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    def forward(self, x: torch.Tensor) -> torch.Tensor:
        if self.use_postshuffle_norm:
            x = self.norm(x.view(-1, self.hidden_size))
        else:
            x = self.norm(x).view(-1, self.hidden_size)

        x_parallel, _ = self.linear_fc1(x)
        x_parallel = self.act_fn(x_parallel)
        out, _ = self.linear_fc2(x_parallel)
        return out


class Qwen3_VisionTransformer(nn.Module):
    def __init__(
        self,
        vision_config: Qwen3VLVisionConfig,
        norm_eps: float = 1e-6,
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        quant_config: QuantizationConfig | None = None,
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        prefix: str = "",
    ) -> None:
        super().__init__()
        self.hidden_size = vision_config.hidden_size
        self.num_heads = vision_config.num_heads
        self.num_position_embeddings = vision_config.num_position_embeddings
        self.patch_size = vision_config.patch_size
        self.spatial_merge_size = vision_config.spatial_merge_size
        self.spatial_merge_unit = self.spatial_merge_size**2
        self.temporal_patch_size = vision_config.temporal_patch_size
        self.deepstack_visual_indexes = vision_config.deepstack_visual_indexes
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        self.num_grid_per_side = int(self.num_position_embeddings**0.5)
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        # NOTE: This is used for creating empty tensor for all_gather for
        # DP ViT. Here out_hidden_size is enlarged due to deepstack
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        self.out_hidden_size = vision_config.out_hidden_size * (
            1 + len(self.deepstack_visual_indexes)
        )
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        self.patch_embed = Qwen3_VisionPatchEmbed(
            patch_size=self.patch_size,
            temporal_patch_size=self.temporal_patch_size,
            in_channels=vision_config.in_channels,
            hidden_size=self.hidden_size,
        )

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        self.pos_embed = nn.Embedding(self.num_position_embeddings, self.hidden_size)
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        norm_layer = partial(nn.LayerNorm, eps=norm_eps)
        head_dim = self.hidden_size // self.num_heads
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        self.rotary_pos_emb = get_rope(
            head_size=head_dim,
            max_position=8192,
            is_neox_style=True,
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            rope_parameters={"partial_rotary_factor": 0.5},
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        )
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        self.merger = Qwen3_VisionPatchMerger(
            d_model=vision_config.out_hidden_size,
            context_dim=self.hidden_size,
            norm_layer=norm_layer,
            spatial_merge_size=self.spatial_merge_size,
            quant_config=quant_config,
            prefix=f"{prefix}.merger",
        )

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        self.deepstack_merger_list = nn.ModuleList(
            [
                Qwen3_VisionPatchMerger(
                    d_model=vision_config.out_hidden_size,
                    context_dim=self.hidden_size,
                    spatial_merge_size=self.spatial_merge_size,
                    use_postshuffle_norm=True,
                    norm_layer=norm_layer,
                    quant_config=quant_config,
                    prefix=f"{prefix}.deepstack_merger_list.{layer_idx}",
                )
                for layer_idx in range(len(self.deepstack_visual_indexes))
            ]
        )
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        self.attn_backend = get_vit_attn_backend(
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            head_size=head_dim,
            dtype=torch.get_default_dtype(),
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        )
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        if self.attn_backend not in {
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            AttentionBackendEnum.FLASH_ATTN,
            AttentionBackendEnum.TORCH_SDPA,
            AttentionBackendEnum.ROCM_AITER_FA,
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        }:
            raise RuntimeError(
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                f"Qwen3-VL does not support {self.attn_backend} backend now."
            )
        self.blocks = nn.ModuleList(
            [
                Qwen3_VisionBlock(
                    dim=self.hidden_size,
                    num_heads=self.num_heads,
                    mlp_hidden_dim=vision_config.intermediate_size,
                    act_fn=_ACTIVATION_REGISTRY[vision_config.hidden_act],
                    norm_layer=norm_layer,
                    quant_config=quant_config,
                    prefix=f"{prefix}.blocks.{layer_idx}",
                )
                for layer_idx in range(vision_config.depth)
            ]
        )
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    @property
    def dtype(self) -> torch.dtype:
        return self.patch_embed.proj.weight.dtype

    @property
    def device(self) -> torch.device:
        return self.patch_embed.proj.weight.device

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    @staticmethod
    @lru_cache(maxsize=1024)
    def rot_pos_ids(h: int, w: int, spatial_merge_size: int) -> torch.Tensor:
        hpos_ids = np.broadcast_to(np.arange(h).reshape(h, 1), (h, w))
        h_div = h // spatial_merge_size
        w_div = w // spatial_merge_size
        hpos_ids = hpos_ids.reshape(
            h_div,
            spatial_merge_size,
            w_div,
            spatial_merge_size,
        )
        hpos_ids = hpos_ids.transpose(0, 2, 1, 3)
        hpos_ids = hpos_ids.flatten()

        wpos_ids = np.broadcast_to(np.arange(w).reshape(1, w), (h, w))
        wpos_ids = wpos_ids.reshape(
            h_div,
            spatial_merge_size,
            w_div,
            spatial_merge_size,
        )
        wpos_ids = wpos_ids.transpose(0, 2, 1, 3)
        wpos_ids = wpos_ids.flatten()

        return torch.from_numpy(np.stack([hpos_ids, wpos_ids], axis=-1))

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    def rot_pos_emb(self, grid_thw: list[list[int]]):
        max_grid_size = max(max(h, w) for _, h, w in grid_thw)
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        pos_ids = [
            self.rot_pos_ids(h, w, self.spatial_merge_size)
            if t == 1
            else self.rot_pos_ids(h, w, self.spatial_merge_size).repeat(t, 1)
            for t, h, w in grid_thw
        ]
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        pos_ids = torch.cat(pos_ids, dim=0).to(self.device, non_blocking=True)
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        # Use pre-computed cos_sin_cache from RotaryEmbedding
        cos, sin = self.rotary_pos_emb.get_cos_sin(max_grid_size)

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        cos_combined = cos[pos_ids].flatten(1)
        sin_combined = sin[pos_ids].flatten(1)
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        return cos_combined, sin_combined
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    def fast_pos_embed_interpolate(self, grid_thw: list[list[int]]) -> torch.Tensor:
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        num_grid_per_side = self.num_grid_per_side
        m_size = self.spatial_merge_size
        hidden_dim = self.pos_embed.embedding_dim
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        outputs = []
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        for t, h, w in grid_thw:
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            h_idxs = torch.linspace(
                0, num_grid_per_side - 1, h, dtype=torch.float32, device=self.device
            )
            w_idxs = torch.linspace(
                0, num_grid_per_side - 1, w, dtype=torch.float32, device=self.device
            )
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            h_floor = h_idxs.to(torch.long)
            w_floor = w_idxs.to(torch.long)
            h_ceil = torch.clamp(h_floor + 1, max=num_grid_per_side - 1)
            w_ceil = torch.clamp(w_floor + 1, max=num_grid_per_side - 1)

            dh = h_idxs - h_floor
            dw = w_idxs - w_floor

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            # Create meshgrid view for all h, w vars
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            dh_grid, dw_grid = torch.meshgrid(dh, dw, indexing="ij")
            h_floor_grid, w_floor_grid = torch.meshgrid(h_floor, w_floor, indexing="ij")
            h_ceil_grid, w_ceil_grid = torch.meshgrid(h_ceil, w_ceil, indexing="ij")
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            # original computation of weights
            # w00 = (1 - dh_grid) * (1 - dw_grid)
            # w01 = (1 - dh_grid) * dw_grid
            # w10 = dh_grid * (1 - dw_grid)
            # w11 = dh_grid * dw_grid
            # we reuse w11 here to avoid duplicate
            # dh_grid * dw_grid computation
            w11 = dh_grid * dw_grid
            w10 = dh_grid - w11
            w01 = dw_grid - w11
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            w00 = 1 - dh_grid - w01
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            h_grid = torch.stack([h_floor_grid, h_floor_grid, h_ceil_grid, h_ceil_grid])
            w_grid = torch.stack([w_floor_grid, w_ceil_grid, w_floor_grid, w_ceil_grid])
            h_grid_idx = h_grid * num_grid_per_side
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            indices = (h_grid_idx + w_grid).reshape(4, -1)
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            weights = torch.stack([w00, w01, w10, w11], dim=0).reshape(4, -1, 1)
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            weights = weights.to(dtype=self.dtype)
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            embeds = self.pos_embed(indices)
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            embeds *= weights
            combined = embeds.sum(dim=0)
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            combined = combined.reshape(
                h // m_size, m_size, w // m_size, m_size, hidden_dim
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            )
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            combined = combined.permute(0, 2, 1, 3, 4).reshape(1, -1, hidden_dim)
            repeated = combined.expand(t, -1, -1).reshape(-1, hidden_dim)
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            outputs.append(repeated)

        return torch.cat(outputs, dim=0)
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    def compute_attn_mask_seqlen(
        self,
        cu_seqlens: torch.Tensor,
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    ) -> torch.Tensor:
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        max_seqlen = torch.zeros([], device=cu_seqlens.device)
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        if (
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            self.attn_backend == AttentionBackendEnum.FLASH_ATTN
            or self.attn_backend == AttentionBackendEnum.ROCM_AITER_FA
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        ):
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            max_seqlen = (cu_seqlens[1:] - cu_seqlens[:-1]).max()
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        return max_seqlen
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    def forward(
        self,
        x: torch.Tensor,
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        grid_thw: torch.Tensor | list[list[int]],
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    ) -> torch.Tensor:
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        hidden_states = x.to(device=self.device, dtype=self.dtype, non_blocking=True)
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        hidden_states = self.patch_embed(hidden_states)

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        if isinstance(grid_thw, list):
            grid_thw_list = grid_thw
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            grid_thw = np.array(grid_thw, dtype=np.int32)
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        else:
            grid_thw_list = grid_thw.tolist()
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            grid_thw = grid_thw.numpy()
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        pos_embeds = self.fast_pos_embed_interpolate(grid_thw_list)
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        hidden_states = hidden_states + pos_embeds
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        rotary_pos_emb_cos, rotary_pos_emb_sin = self.rot_pos_emb(grid_thw_list)
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        cu_seqlens = np.repeat(grid_thw[:, 1] * grid_thw[:, 2], grid_thw[:, 0]).cumsum(
            axis=0, dtype=np.int32
        )
        cu_seqlens = np.concatenate([np.zeros(1, dtype=np.int32), cu_seqlens])
        cu_seqlens = torch.from_numpy(cu_seqlens)
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        hidden_states = hidden_states.unsqueeze(1)
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        max_seqlen = self.compute_attn_mask_seqlen(cu_seqlens)
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        cu_seqlens = cu_seqlens.to(self.device, non_blocking=True)
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        deepstack_feature_lists = []
        for layer_num, blk in enumerate(self.blocks):
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            hidden_states = blk(
                hidden_states,
                cu_seqlens=cu_seqlens,
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                rotary_pos_emb_cos=rotary_pos_emb_cos,
                rotary_pos_emb_sin=rotary_pos_emb_sin,
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                max_seqlen=max_seqlen,
            )
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            if layer_num in self.deepstack_visual_indexes:
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                deepstack_merger_idx = self.deepstack_visual_indexes.index(layer_num)
                deepstack_feature = self.deepstack_merger_list[deepstack_merger_idx](
                    hidden_states
                )
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                deepstack_feature_lists.append(deepstack_feature)
        hidden_states = self.merger(hidden_states)
        hidden_states = torch.cat(
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            [hidden_states] + deepstack_feature_lists, dim=1
        )  # [seq_len, hidden_size * (1 + depth_of_deepstack)]
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        return hidden_states

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    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
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        stacked_params_mapping = [
            # (param_name, shard_name, shard_id)
            ("attn.qkv.", "attn.q.", "q"),
            ("attn.qkv.", "attn.k.", "k"),
            ("attn.qkv.", "attn.v.", "v"),
        ]
        params_dict = dict(self.named_parameters(remove_duplicate=False))
        loaded_params: set[str] = set()

        for name, loaded_weight in weights:
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            for param_name, weight_name, shard_id in stacked_params_mapping:
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                if weight_name not in name:
                    continue
                name = name.replace(weight_name, param_name)

                param = params_dict[name]
                weight_loader = param.weight_loader
                weight_loader(param, loaded_weight, shard_id)
                break
            else:
                param = params_dict[name]
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                weight_loader = getattr(param, "weight_loader", default_weight_loader)
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                weight_loader(param, loaded_weight)
            loaded_params.add(name)
        return loaded_params


class Qwen3VLProcessingInfo(Qwen2VLProcessingInfo):
    def get_hf_config(self):
        return self.ctx.get_hf_config(Qwen3VLConfig)

    def get_hf_processor(self, **kwargs: object) -> Qwen3VLProcessor:
        return self.ctx.get_hf_processor(
            Qwen3VLProcessor,
            use_fast=kwargs.pop("use_fast", True),
            **kwargs,
        )

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    def get_image_processor(self, **kwargs: object) -> Qwen2VLImageProcessorFast:
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        return self.get_hf_processor(**kwargs).image_processor

    def get_video_processor(self, **kwargs: object) -> Qwen3VLVideoProcessor:
        return self.get_hf_processor(**kwargs).video_processor

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    def get_data_parser(self):
        return Qwen2VLMultiModalDataParser(
            self.get_hf_config().vision_config.spatial_merge_size,
            video_needs_metadata=True,
            expected_hidden_size=self._get_expected_hidden_size(),
        )

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    def _get_vision_info(
        self,
        *,
        image_width: int,
        image_height: int,
        num_frames: int = 2,
        do_resize: bool = True,
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        image_processor: Qwen2VLImageProcessorFast | Qwen3VLVideoProcessor | None,
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    ) -> tuple[ImageSize, int]:
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        if image_processor is None and num_frames > 1:
            image_processor = self.get_video_processor()
        elif image_processor is None:
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            image_processor = self.get_image_processor()

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        is_video = isinstance(image_processor, Qwen3VLVideoProcessor)

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        hf_config = self.get_hf_config()
        vision_config = hf_config.vision_config
        patch_size = vision_config.patch_size
        merge_size = vision_config.spatial_merge_size
        temporal_patch_size = vision_config.temporal_patch_size

        if do_resize:
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            if is_video:
                smart_resize = video_smart_resize
                extra_kwargs = {
                    "num_frames": num_frames,
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                    "temporal_factor": temporal_patch_size,
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                }
            else:
                smart_resize = image_smart_resize
                extra_kwargs = {}
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            resized_height, resized_width = smart_resize(
                height=image_height,
                width=image_width,
                factor=patch_size * merge_size,
                min_pixels=image_processor.size["shortest_edge"],
                max_pixels=image_processor.size["longest_edge"],
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                **extra_kwargs,
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            )
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            preprocessed_size = ImageSize(width=resized_width, height=resized_height)
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        else:
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            preprocessed_size = ImageSize(width=image_width, height=image_height)
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        padded_num_frames = round_up(num_frames, temporal_patch_size)
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        grid_t = max(padded_num_frames // temporal_patch_size, 1)
        grid_h = preprocessed_size.height // patch_size
        grid_w = preprocessed_size.width // patch_size

        num_patches = grid_t * grid_h * grid_w
        num_vision_tokens = num_patches // (merge_size**2)

        return preprocessed_size, num_vision_tokens

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    def _get_max_video_frames(self, max_tokens: int, start_num_frames: int = 2) -> int:
        return super()._get_max_video_frames(
            max_tokens, start_num_frames=start_num_frames
        )
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    def get_num_frames_with_most_features(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
    ) -> int:
        return super().get_num_frames_with_most_features(
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            seq_len, mm_counts, max_frames_per_video=DUMMY_VIDEO_NUM_FRAMES
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        )
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    def get_max_video_tokens(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
    ) -> int:
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        video_processor = self.get_video_processor()
        video_max_pixels = video_processor.size["longest_edge"]
        # video_max_pixels contains the temporal compression factor,
        # so we divide by 2 to get the maximum number of image pixels.
        target_width, target_height = self.get_image_size_with_most_features(
            max_pixels=video_max_pixels // video_processor.temporal_patch_size
        )
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        num_video_soft_tokens = self.get_num_video_tokens(
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            image_width=target_width,
            image_height=target_height,
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            num_frames=2,
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            image_processor=None,
        )
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        return num_video_soft_tokens
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    def _calculate_timestamps(
        self, indices: list[int] | torch.Tensor, video_fps: float, merge_size: int
    ):
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        if not isinstance(indices, list):
            indices = indices.tolist()
        if len(indices) % merge_size != 0:
            # don't update metadata's frames_indices directly
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            indices = indices + [indices[-1]] * (merge_size - len(indices) % merge_size)
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        timestamps = [idx / video_fps for idx in indices]
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        timestamps = [
            (timestamps[i] + timestamps[i + merge_size - 1]) / 2
            for i in range(0, len(timestamps), merge_size)
        ]
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        return timestamps

    def _get_video_second_idx(
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        self,
        metadata: dict[str, Any],
        out_item: MultiModalKwargsItem,
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        do_sample_frames: bool | None = None,
        sampled_fps: float | None = None,
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    ) -> list[int]:
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        video_processor = self.get_video_processor()
        merge_size = video_processor.merge_size
        indices = metadata["frames_indices"]

        # metadata["fps"] refers to the true fps of the input video.
        video_fps = metadata["fps"]
        if do_sample_frames is None:
            do_sample_frames = metadata.get("do_sample_frames", False)

        # If video frames are sampled in HF processor (instead of vLLM
        # video loader), we need to re-calculate the indices from original
        # metadata.
        if do_sample_frames:
            # here video_fps is the fps of the sampled video, and
            # metadata["fps"] refers to the fps of the original video.
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            sampled_fps = sampled_fps if sampled_fps else video_processor.fps
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            total_num_frames = metadata["total_num_frames"]
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            num_frames = int(total_num_frames / metadata["fps"] * sampled_fps)
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            num_frames = min(
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                min(
                    max(num_frames, video_processor.min_frames),
                    video_processor.max_frames,
                ),
                total_num_frames,
            )
            indices = (
                np.linspace(0, total_num_frames - 1, num_frames)
                .round()
                .astype(int)
                .tolist()
            )
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        timestamps = self._calculate_timestamps(indices, video_fps, merge_size)
        return timestamps


class Qwen3VLDummyInputsBuilder(BaseDummyInputsBuilder[Qwen3VLProcessingInfo]):
    def get_dummy_text(self, mm_counts: Mapping[str, int]) -> str:
        num_images = mm_counts.get("image", 0)
        num_videos = mm_counts.get("video", 0)

        image_token = "<|vision_start|><|image_pad|><|vision_end|>"
        video_token = "<|vision_start|><|video_pad|><|vision_end|>"

        return image_token * num_images + video_token * num_videos

    def get_dummy_mm_data(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
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        mm_options: Mapping[str, BaseDummyOptions] | None = None,
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    ) -> MultiModalDataDict:
        num_images = mm_counts.get("image", 0)
        num_videos = mm_counts.get("video", 0)
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        image_overrides = mm_options.get("image") if mm_options else None
        video_overrides = mm_options.get("video") if mm_options else None
800

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        target_image_width, target_image_height = (
            self.info.get_image_size_with_most_features()
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        )
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        # treat videos as special images
        target_num_frames = 2
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        if video_overrides:
            assert isinstance(video_overrides, VideoDummyOptions)
            num_frames_override = video_overrides.num_frames
            if num_frames_override:
                if num_frames_override > target_num_frames:
                    logger.warning(
                        "video.num_frames override (%d) exceeds model's "
                        "maximum number of frames (%d), will be ignored",
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                        num_frames_override,
                        target_num_frames,
                    )
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                if num_frames_override < 2:
                    logger.warning(
                        "video.num_frames override (%d) cannot be less "
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                        "than 2, will be ignored",
                        num_frames_override,
                    )
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                target_num_frames = min(target_num_frames, num_frames_override)
        target_num_frames = max(target_num_frames, 2)

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        video_processor = self.info.get_video_processor()
        video_max_pixels = video_processor.size["longest_edge"]
        # video_max_pixels contains the temporal compression factor,
        # so we divide by 2 to get the maximum number of image pixels.
        target_video_width, target_video_height = (
            self.info.get_image_size_with_most_features(
                max_pixels=video_max_pixels // video_processor.temporal_patch_size
            )
        )
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        target_video_size, _ = self.info._get_vision_info(
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            image_width=target_video_width,
            image_height=target_video_height,
839
            num_frames=target_num_frames,
840
            image_processor=video_processor,
841
        )
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        # NOTE: we need to do this check here since Qwen3-VL resizes video
        # frames depending on how many frames there are.
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        target_video_width, target_video_height = (
            target_video_size.width,
            target_video_size.height,
        )
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        if video_overrides:
            assert isinstance(video_overrides, VideoDummyOptions)
            width_override = video_overrides.width
            if width_override:
852
                if width_override > target_video_width:
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                    logger.warning(
                        "video.width override (%d) exceeds model's "
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                        "maximum width (%d), will be ignored",
                        width_override,
857
                        target_video_width,
858
                    )
859
                target_video_width = min(target_video_width, width_override)
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            height_override = video_overrides.height
            if height_override:
862
                if height_override > target_video_height:
863
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865
                    logger.warning(
                        "video.height override (%d) exceeds model's "
                        "maximum height (%d), will be ignored",
866
                        height_override,
867
                        target_video_height,
868
                    )
869
                target_video_height = min(target_video_height, height_override)
870

871
        return {
872
            "image": self._get_dummy_images(
873
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                width=target_image_width,
                height=target_image_height,
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                num_images=num_images,
                overrides=image_overrides,
            ),
            "video": self._get_dummy_videos(
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                width=target_video_width,
                height=target_video_height,
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                num_frames=target_num_frames,
                num_videos=num_videos,
            ),
        }

    def _get_dummy_videos(
        self,
        *,
        width: int,
        height: int,
        num_frames: int,
        num_videos: int,
    ) -> list[VideoItem]:
        video = np.full((num_frames, width, height, 3), 255, dtype=np.uint8)
        video_items = []
        for i in range(num_videos):
            video_metadata = {
                "fps": 2.0,
                "duration": num_frames / 2.0,
                "total_num_frames": num_frames,
                "frames_indices": [i for i in range(num_frames)],
                "video_backend": "opencv",
                "do_sample_frames": False,
            }
            video_item = (video.copy(), video_metadata)
            video_items.append(video_item)
        return video_items


910
class Qwen3VLMultiModalProcessor(BaseMultiModalProcessor[Qwen3VLProcessingInfo]):
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    def _call_hf_processor(
        self,
        prompt: str,
        mm_data: Mapping[str, object],
        mm_kwargs: Mapping[str, object],
        tok_kwargs: Mapping[str, object],
    ) -> BatchFeature:
        mm_data = dict(mm_data)
        processor = self.info.get_hf_processor(**mm_kwargs)

        # Separate video processing from image processing. Because the videos
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        # are processed into several image patches
        if videos := mm_data.pop("videos", []):
924
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            video_grid_thw_lst = []
            pixel_values_videos_lst = []

927
            for item in videos:
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941
                video_array, metadata = item

                # NOTE: @JJJYmmm new attr metadata.frames_indices indicates
                # the sampled frames indices of pre-sampled videos, which is
                # used to calculate the timestamps. Make sure that
                # do_sample_frames in mm_kwargs is false for presampled videos.

                # NOTE: a copy of is created to update do_sample_frames,
                # otherwise mm_hash for the object will be incorrect.
                video_mm_kwargs = dict(**mm_kwargs)
                if "do_sample_frames" not in video_mm_kwargs:
                    # qwen_vl_utils already has "do_sample_frames" in
                    # mm_kwargs, don't overwrite it.
                    video_mm_kwargs["do_sample_frames"] = metadata.get(
942
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                        "do_sample_frames", False
                    )
944

945
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                metadata = VideoMetadata(
                    **{k: metadata[k] for k in metadata if k != "do_sample_frames"}
                )
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                video_mm_data = dict()
                video_mm_data["videos"] = [[video_array]]
                video_mm_data["video_metadata"] = [[metadata]]

                video_outputs = super()._call_hf_processor(
                    prompt="<|vision_start|><|video_pad|><|vision_end|>",
                    mm_data=video_mm_data,
                    mm_kwargs=video_mm_kwargs,
                    tok_kwargs=tok_kwargs,
                )
                input_ids = video_outputs.pop("input_ids")
960
                video_placeholder = processor.tokenizer.batch_decode(input_ids)[0]
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                prompt = prompt.replace(
                    "<|vision_start|><|video_pad|><|vision_end|>",
                    video_placeholder,
                    1,
                )

                video_grid_thw_lst.append(video_outputs["video_grid_thw"])
968
                pixel_values_videos_lst.append(video_outputs["pixel_values_videos"])
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            video_outputs = dict(
                pixel_values_videos=torch.cat(pixel_values_videos_lst),
                video_grid_thw=torch.cat(video_grid_thw_lst),
            )
        else:
            video_outputs = dict()

        processed_outputs = super()._call_hf_processor(
            prompt=prompt,
            mm_data=mm_data,
            mm_kwargs=mm_kwargs,
            tok_kwargs=tok_kwargs,
        )
        combined_outputs = dict(
            processed_outputs,
            **video_outputs,
        )
        return BatchFeature(combined_outputs)

    def _get_mm_fields_config(
        self,
        hf_inputs: BatchFeature,
        hf_processor_mm_kwargs: Mapping[str, object],
    ) -> Mapping[str, MultiModalFieldConfig]:
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        return _create_qwen2vl_field_factory(
            self.info.get_hf_config().vision_config.spatial_merge_size
        )(hf_inputs)
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    def _get_prompt_updates(
        self,
        mm_items: MultiModalDataItems,
        hf_processor_mm_kwargs: Mapping[str, Any],
        out_mm_kwargs: MultiModalKwargsItems,
    ) -> Sequence[PromptUpdate]:
        hf_processor = self.info.get_hf_processor(**hf_processor_mm_kwargs)
1004
        image_processor = self.info.get_image_processor(**hf_processor_mm_kwargs)
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        tokenizer = self.info.get_tokenizer()
        hf_config = self.info.get_hf_config()

        video_token_id = hf_config.video_token_id
        vision_start_token_id = hf_config.vision_start_token_id
        vision_end_token_id = hf_config.vision_end_token_id

        merge_length = image_processor.merge_size**2

        def get_image_replacement_qwen3vl(item_idx: int):
            out_item = out_mm_kwargs["image"][item_idx]
            grid_thw = out_item["image_grid_thw"].data
            assert isinstance(grid_thw, torch.Tensor)

            num_tokens = int(grid_thw.prod()) // merge_length
            return [hf_processor.image_token_id] * num_tokens

        def get_video_replacement_qwen3vl(item_idx: int):
            out_item = out_mm_kwargs["video"][item_idx]
            grid_thw = out_item["video_grid_thw"].data
            assert isinstance(grid_thw, torch.Tensor)

            video, metadata = mm_items["video"][item_idx]
            do_sample_frames = hf_processor_mm_kwargs.get("do_sample_frames")
            sampled_fps = hf_processor_mm_kwargs.get("fps")
            if is_list_of(sampled_fps, float):
                sampled_fps = sampled_fps[item_idx]
            timestamps = self.info._get_video_second_idx(
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                metadata, out_item, do_sample_frames, sampled_fps
            )
1035
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1037

            assert len(timestamps) == grid_thw[0], (
                f"The timestamps length({len(timestamps)}) should be equal "
1038
1039
                f"video length ({grid_thw[0]})."
            )
1040
1041

            frames_idx_token = [
1042
                tokenizer.encode(f"<{curr_time:.1f} seconds>", add_special_tokens=False)
1043
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                for curr_time in timestamps
            ]
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            tokens_per_frame = int(grid_thw[1:].prod()) // merge_length
            per_frame_token_counts = [tokens_per_frame for _ in frames_idx_token]

            video_pruning_rate = self.info.ctx.get_mm_config().video_pruning_rate
            if video_pruning_rate is not None and video_pruning_rate > 0.0:
                total_retained = compute_retained_tokens_count(
                    tokens_per_frame,
                    len(frames_idx_token),
                    video_pruning_rate,
                )
                if len(frames_idx_token) == 0:
                    per_frame_token_counts = []
                elif len(frames_idx_token) == 1:
                    per_frame_token_counts = [tokens_per_frame]
                else:
                    first_frame_tokens = tokens_per_frame
                    remaining_tokens = max(total_retained - first_frame_tokens, 0)
                    base = remaining_tokens // (len(frames_idx_token) - 1)
                    remainder = remaining_tokens % (len(frames_idx_token) - 1)
                    per_frame_token_counts = [first_frame_tokens]
                    for frame_idx in range(1, len(frames_idx_token)):
                        extra = base + (1 if (frame_idx - 1) < remainder else 0)
                        per_frame_token_counts.append(extra)

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            placeholder = []
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            for frame_idx, timestamp_tokens in enumerate(frames_idx_token):
                placeholder.extend(timestamp_tokens)
                tokens_this_frame = per_frame_token_counts[
                    frame_idx if frame_idx < len(per_frame_token_counts) else -1
                ]
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                placeholder.extend(
                    [vision_start_token_id]
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                    + [video_token_id] * tokens_this_frame
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                    + [vision_end_token_id]
                )
            return PromptUpdateDetails.select_token_id(placeholder, video_token_id)
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        return [
            PromptReplacement(
                modality="image",
                target=hf_processor.image_token,
                replacement=get_image_replacement_qwen3vl,
            ),
            # NOTE: We match string on purpose since searching sequence of
            # token ids takes more time.
            PromptReplacement(
                modality="video",
                target="<|vision_start|><|video_pad|><|vision_end|>",
                replacement=get_video_replacement_qwen3vl,
            ),
        ]


@support_torch_compile(
    dynamic_arg_dims={
        "input_ids": 0,
        # positions is of shape (3, seq_len) if mrope is enabled for qwen2-vl,
        # otherwise (seq_len, ).
        "positions": -1,
        "intermediate_tensors": 0,
        "inputs_embeds": 0,
        # the same shape as input_embeds
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        "deepstack_input_embeds": 0,
    }
)
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class Qwen3LLMModel(Qwen3Model):
    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super().__init__(vllm_config=vllm_config, prefix=prefix)
        if not get_pp_group().is_first_rank:
            assert self.start_layer >= len(
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                vllm_config.model_config.hf_config.vision_config.deepstack_visual_indexes
            ), (
                "start_layer should be greater than or equal to "
                "len(deepstack_visual_indexes)"
            )
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    def forward(
        self,
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        input_ids: torch.Tensor | None,
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        positions: torch.Tensor,
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        intermediate_tensors: IntermediateTensors | None = None,
        inputs_embeds: torch.Tensor | None = None,
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        # args for deepstack
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        deepstack_input_embeds: IntermediateTensors | None = None,
    ) -> torch.Tensor | IntermediateTensors:
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        if get_pp_group().is_first_rank:
            if inputs_embeds is not None:
                hidden_states = inputs_embeds
            else:
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                hidden_states = self.embed_input_ids(input_ids)
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            residual = None
        else:
            assert intermediate_tensors is not None
            hidden_states = intermediate_tensors["hidden_states"]
            residual = intermediate_tensors["residual"]
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        aux_hidden_states = []
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        for layer_idx, layer in islice(
            enumerate(self.layers), self.start_layer, self.end_layer
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        ):
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            if layer_idx in self.aux_hidden_state_layers:
                aux_hidden_states.append(hidden_states + residual)
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            hidden_states, residual = layer(
                positions,
                hidden_states,
                residual,
            )

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            if deepstack_input_embeds is not None and layer_idx in range(
                0, len(deepstack_input_embeds)
            ):
                hidden_states = (
                    hidden_states
                    + deepstack_input_embeds[f"deepstack_input_embeds_{layer_idx}"]
                )
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        if not get_pp_group().is_last_rank:
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            return IntermediateTensors(
                {"hidden_states": hidden_states, "residual": residual}
            )
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        hidden_states, _ = self.norm(hidden_states, residual)
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        if len(aux_hidden_states) > 0:
            return hidden_states, aux_hidden_states
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        return hidden_states


class Qwen3LLMForCausalLM(Qwen3ForCausalLM):
    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super(Qwen3ForCausalLM, self).__init__()
        config = vllm_config.model_config.hf_config.text_config
        quant_config = vllm_config.quant_config

        self.config = config

        self.quant_config = quant_config
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        self.model = Qwen3LLMModel(
            vllm_config=vllm_config, prefix=maybe_prefix(prefix, "model")
        )
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        if get_pp_group().is_last_rank:
            if config.tie_word_embeddings:
                self.lm_head = self.model.embed_tokens
            else:
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                self.lm_head = ParallelLMHead(
                    config.vocab_size,
                    config.hidden_size,
                    quant_config=quant_config,
                    prefix="lm_head",
                )
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        else:
            self.lm_head = PPMissingLayer()

        self.logits_processor = LogitsProcessor(config.vocab_size)

        self.make_empty_intermediate_tensors = (
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            self.model.make_empty_intermediate_tensors
        )
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@MULTIMODAL_REGISTRY.register_processor(
    Qwen3VLMultiModalProcessor,
    info=Qwen3VLProcessingInfo,
    dummy_inputs=Qwen3VLDummyInputsBuilder,
)
class Qwen3VLForConditionalGeneration(
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    nn.Module,
    SupportsMultiModal,
    SupportsLoRA,
    SupportsPP,
    SupportsMRoPE,
    SupportsEagle3,
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    SupportsMultiModalPruning,
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):
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    packed_modules_mapping = {
        "qkv_proj": [
            "q_proj",
            "k_proj",
            "v_proj",
        ],
        "gate_up_proj": [
            "gate_proj",
            "up_proj",
        ],
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        "qkv": ["qkv"],  # For vision tower's already-packed QKV
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    }
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    supports_encoder_tp_data = True

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    # To ensure correct weight loading and mapping.
    hf_to_vllm_mapper = WeightsMapper(
        orig_to_new_prefix={
            "model.visual.": "visual.",
            "lm_head.": "language_model.lm_head.",
            "model.language_model.": "language_model.model.",
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        }
    )
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    @classmethod
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    def get_placeholder_str(cls, modality: str, i: int) -> str | None:
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        if modality.startswith("image"):
            return "<|vision_start|><|image_pad|><|vision_end|>"
        if modality.startswith("video"):
            return "<|vision_start|><|video_pad|><|vision_end|>"

        raise ValueError("Only image or video modality is supported")

    def __init__(self, *, vllm_config: VllmConfig, prefix: str = "model"):
        super().__init__()
        config: Qwen3VLConfig = vllm_config.model_config.hf_config
        quant_config = vllm_config.quant_config
        multimodal_config = vllm_config.model_config.multimodal_config

        self.config = config
        self.multimodal_config = multimodal_config
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        self.use_data_parallel = multimodal_config.mm_encoder_tp_mode == "data"
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        self.video_pruning_rate = multimodal_config.video_pruning_rate
        self.is_multimodal_pruning_enabled = (
            multimodal_config.is_multimodal_pruning_enabled()
        )

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        self.use_deepstack = hasattr(config.vision_config, "deepstack_visual_indexes")
        self.deepstack_num_level = (
            len(config.vision_config.deepstack_visual_indexes)
            if self.use_deepstack
            else 0
        )
        self.visual_dim = config.vision_config.out_hidden_size
        self.multiscale_dim = self.visual_dim * self.deepstack_num_level

        with self._mark_tower_model(vllm_config, {"image", "video"}):
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            self.visual = Qwen3_VisionTransformer(
                config.vision_config,
                norm_eps=getattr(config, "rms_norm_eps", 1e-6),
                quant_config=quant_config,
                prefix=maybe_prefix(prefix, "visual"),
            )
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            # register buffer for deepstack
            if self.use_deepstack:
                self.deepstack_input_embeds = [
                    torch.zeros(
                        vllm_config.scheduler_config.max_num_batched_tokens,
                        config.text_config.hidden_size,
                    )
                    for _ in range(self.deepstack_num_level)
                ]

        with self._mark_language_model(vllm_config):
            self.language_model = Qwen3LLMForCausalLM(
                vllm_config=vllm_config, prefix=maybe_prefix(prefix, "language_model")
            )
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        self.make_empty_intermediate_tensors = (
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            self.language_model.make_empty_intermediate_tensors
        )
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    def set_aux_hidden_state_layers(self, layers: tuple[int, ...]) -> None:
        self.language_model.model.aux_hidden_state_layers = layers

    def get_eagle3_aux_hidden_state_layers(self) -> tuple[int, ...]:
        num_layers = len(self.language_model.model.layers)
        return (2, num_layers // 2, num_layers - 3)

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    def _get_deepstack_input_embeds(
        self,
        num_tokens: int,
    ) -> IntermediateTensors | None:
        if not getattr(self, "deepstack_input_embeds", None):
            return None  # If vision tower is skipped

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        # get deepstack_input_embeds from buffer, and clear the buffer
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        return IntermediateTensors(
            {
                f"deepstack_input_embeds_{idx}": self.deepstack_input_embeds[idx][
                    :num_tokens
                ]
                for idx in range(self.deepstack_num_level)
            }
        )

    def _set_deepstack_input_embeds(self, deepstack_input_embeds: torch.Tensor) -> None:
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        if not getattr(self, "deepstack_input_embeds", None):
            return

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        # set deepstack_input_embeds to buffer
        num_tokens = deepstack_input_embeds.size(1)
        if num_tokens > self.deepstack_input_embeds[0].size(0):
            self.deepstack_input_embeds = [
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                torch.zeros(
                    num_tokens,
                    self.config.text_config.hidden_size,
                    device=self.deepstack_input_embeds[0].device,
                    dtype=self.deepstack_input_embeds[0].dtype,
                )
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                for _ in range(self.deepstack_num_level)
            ]
        for idx in range(self.deepstack_num_level):
            self.deepstack_input_embeds[idx][:num_tokens].copy_(
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                deepstack_input_embeds[idx]
            )
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    def _clear_deepstack_input_embeds(self, num_tokens: int) -> None:
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        if not getattr(self, "deepstack_input_embeds", None):
            return

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        # clear deepstack_input_embeds in buffer
        if num_tokens > 0:
            for idx in range(self.deepstack_num_level):
                self.deepstack_input_embeds[idx][:num_tokens].zero_()

    def _parse_and_validate_image_input(
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        self, **kwargs: object
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    ) -> Qwen2_5_VLImageInputs | None:
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        pixel_values = kwargs.pop("pixel_values", None)
        image_embeds = kwargs.pop("image_embeds", None)
        image_grid_thw = kwargs.pop("image_grid_thw", None)

        if pixel_values is None and image_embeds is None:
            return None

        if pixel_values is not None:
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            return Qwen2_5_VLImagePixelInputs(
                type="pixel_values",
                pixel_values=pixel_values,
                image_grid_thw=image_grid_thw,
            )
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        if image_embeds is not None:
            return Qwen2_5_VLImageEmbeddingInputs(
                type="image_embeds",
                image_embeds=image_embeds,
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                image_grid_thw=image_grid_thw,
            )
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    def _parse_and_validate_video_input(
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        self, **kwargs: object
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    ) -> Qwen2_5_VLVideoInputs | None:
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        pixel_values_videos = kwargs.pop("pixel_values_videos", None)
        video_embeds = kwargs.pop("video_embeds", None)
        video_grid_thw = kwargs.pop("video_grid_thw", None)
        second_per_grid_ts = kwargs.pop("second_per_grid_ts", None)

        if pixel_values_videos is None and video_embeds is None:
            return None

        if pixel_values_videos is not None:
            return Qwen2_5_VLVideoPixelInputs(
                type="pixel_values_videos",
                pixel_values_videos=pixel_values_videos,
                video_grid_thw=video_grid_thw,
                second_per_grid_ts=second_per_grid_ts,
            )

        if video_embeds is not None:
            return Qwen2_5_VLVideoEmbeddingInputs(
                type="video_embeds",
                video_embeds=video_embeds,
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                video_grid_thw=video_grid_thw,
            )
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    def _process_image_input(
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        self, image_input: Qwen2_5_VLImageInputs
    ) -> tuple[torch.Tensor, ...]:
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        grid_thw = image_input["image_grid_thw"]
        assert grid_thw.ndim == 2

        if image_input["type"] == "image_embeds":
            image_embeds = image_input["image_embeds"].type(self.visual.dtype)
        else:
            pixel_values = image_input["pixel_values"].type(self.visual.dtype)
1417
            if self.use_data_parallel:
1418
                return run_dp_sharded_mrope_vision_model(
1419
                    self.visual, pixel_values, grid_thw.tolist(), rope_type="rope_3d"
1420
                )
1421
            else:
1422
                image_embeds = self.visual(pixel_values, grid_thw=grid_thw)
1423
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        # Split concatenated embeddings for each image item.
        merge_size = self.visual.spatial_merge_size
1426
        sizes = (grid_thw.prod(-1) // merge_size // merge_size).tolist()
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        return image_embeds.split(sizes)

    def _process_video_input(
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        self, video_input: Qwen2_5_VLVideoInputs
    ) -> tuple[torch.Tensor, ...]:
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        grid_thw = video_input["video_grid_thw"]
        assert grid_thw.ndim == 2

        if video_input["type"] == "video_embeds":
            video_embeds = video_input["video_embeds"].type(self.visual.dtype)
        else:
            pixel_values_videos = video_input["pixel_values_videos"].type(
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                self.visual.dtype
            )
1441
            if self.use_data_parallel:
1442
                grid_thw_list = grid_thw.tolist()
1443
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                return run_dp_sharded_mrope_vision_model(
                    self.visual, pixel_values_videos, grid_thw_list, rope_type="rope_3d"
                )
1446
            else:
1447
                video_embeds = self.visual(pixel_values_videos, grid_thw=grid_thw)
1448
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1450

        # Split concatenated embeddings for each video item.
        merge_size = self.visual.spatial_merge_size
1451
        sizes = (grid_thw.prod(-1) // merge_size // merge_size).tolist()
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        return video_embeds.split(sizes)

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    def _postprocess_image_embeds_evs(
        self,
        image_embeds_split: tuple[torch.Tensor, ...],
        image_input: Qwen2_5_VLImageInputs,
    ) -> tuple[torch.Tensor, ...]:
        """
        Append mrope positions for each for images.
        This is necessary to recover correct mrope
        positions after video pruning

        Args:
            image_embeds_split: Tuple of image embeddings for
                each image item.
            image_input: Image input data.

        Returns:
            Tuple of image embeddings for each image item.
            Resulting embeddings will have extra 4 channels for
            computed mrope positions.
        """
        merge_size = self.visual.spatial_merge_size
        grid_thw = image_input["image_grid_thw"]
        grid_thw_list = grid_thw.tolist()
        image_embeds_out = []
        for emb, size in zip(image_embeds_split, grid_thw_list):
            positions = compute_mrope_for_media(size, merge_size).to(emb.device)
            emb = torch.cat([emb, positions], dim=1)
            image_embeds_out.append(emb)
        image_embeds_split = image_embeds_out
        return tuple(image_embeds_split)

    def _postprocess_video_embeds_evs(
        self,
        video_embeds_split: tuple[torch.Tensor, ...],
        video_input: Qwen2_5_VLVideoInputs,
    ) -> tuple[torch.Tensor, ...]:
        """
        Prunes video embeddings via Efficient Video Sampling (EVS)
        and then appends mrope positions for each retained embeddings

        Args:
            video_embeds_split: Tuple of video embeddings for each video item.
            video_input: Video input data.

        Returns:
            Tuple of video embeddings for each video item.
            Resulting embeddings will have extra 4 channels for
            computed mrope positions.
        """
        grid_thw = video_input["video_grid_thw"]
        assert grid_thw.ndim == 2
        grid_thw_list = grid_thw.tolist()
        merge_size = self.visual.spatial_merge_size

        # Cast to long to match the original code
        # https://github.com/huggingface/transformers/blob/41980ce93e775f6c88500c51c8db7946fc6a2add/src/transformers/models/qwen2_5_vl/modular_qwen2_5_vl.py#L491 # noqa
        second_per_grid_ts = video_input.get("second_per_grid_ts")
        if second_per_grid_ts is None:
            # For Qwen3-VL, second_per_grid_ts might not be available
            # Use default value of 1.0 for each video
            second_per_grid_ts = torch.ones(len(grid_thw_list), dtype=torch.long)
        else:
            second_per_grid_ts = second_per_grid_ts.long()
        tokens_per_second = getattr(self.config.vision_config, "tokens_per_second", 1.0)

        video_embeds_out = []
        for emb, size, video_second_per_grid_t in zip(
            video_embeds_split, grid_thw_list, second_per_grid_ts
        ):
            # For each video, we compute retention mask using EVS
            retention_mask = compute_retention_mask(
                emb,
                size,
                spatial_merge_size=self.visual.spatial_merge_size,
                q=self.video_pruning_rate,
            )

            # Debug logging for EVS pruning
            logger.debug(
                "EVS: Video tokens pruned from %d to %d (T=%d,H=%d,W=%d, "
                "pruning_rate=%.2f, reduction=%.1f%%)",
                emb.shape[0],
                retention_mask.sum().item(),
                size[0],
                size[1],
                size[2],
                self.video_pruning_rate,
                (1 - retention_mask.float().mean().item()) * 100,
            )

            positions = compute_mrope_for_media(
                size,
                merge_size,
                tokens_per_second=tokens_per_second,
                video_second_per_grid=video_second_per_grid_t.item(),
            ).to(emb.device)

            emb = emb[retention_mask]
            positions = positions[retention_mask]
            emb = torch.cat([emb, positions], dim=1)
            video_embeds_out.append(emb)
        return tuple(video_embeds_out)

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    def _parse_and_validate_multimodal_inputs(self, **kwargs: object) -> dict:
        mm_input_by_modality = {}
        for input_key in kwargs:
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            if (
                input_key in ("pixel_values", "image_embeds")
                and "image" not in mm_input_by_modality
            ):
                mm_input_by_modality["image"] = self._parse_and_validate_image_input(
                    **kwargs
                )
            if (
                input_key in ("pixel_values_videos", "video_embeds")
                and "video" not in mm_input_by_modality
            ):
                mm_input_by_modality["video"] = self._parse_and_validate_video_input(
                    **kwargs
                )
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        return mm_input_by_modality

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    def iter_mm_grid_hw(
        self, input_tokens: list[int], mm_features: list[MultiModalFeatureSpec]
    ) -> Iterator[tuple[int, int, int]]:
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        """
        Iterate over multimodal features and yield grid information.

        For videos with EVS (Efficient Video Sampling) enabled, this function
        computes the offset based on the pruned token count rather than relying
        on input_tokens.index(), which would fail when tokens are pruned.

        Args:
            input_tokens: List of token IDs in the prompt
            mm_features: List of multimodal feature specifications

        Yields:
            Tuple of (offset, grid_h, grid_w) for each frame/image
        """
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        video_token_id = self.config.video_token_id
        spatial_merge_size = self.config.vision_config.spatial_merge_size
        for mm_feature in sorted(mm_features, key=lambda f: f.mm_position.offset):
            offset = mm_feature.mm_position.offset
            if mm_feature.modality == "image":
                t, h, w = mm_feature.data["image_grid_thw"].data.tolist()
                assert t == 1, f"Image must have 1 frame, got {t}"
                yield offset, h // spatial_merge_size, w // spatial_merge_size
            elif mm_feature.modality == "video":
                t, h, w = mm_feature.data["video_grid_thw"].data.tolist()
                llm_grid_h = h // spatial_merge_size
                llm_grid_w = w // spatial_merge_size
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                # Check if EVS (Efficient Video Sampling) is enabled
                is_evs_enabled = (
                    hasattr(self, "video_pruning_rate")
                    and self.video_pruning_rate is not None
                    and self.video_pruning_rate > 0.0
                )

                if is_evs_enabled:
                    frame_offsets = self._extract_frame_offsets_from_mask(
                        mm_feature.mm_position, t
                    )
                    if frame_offsets is not None:
                        for rel_offset in frame_offsets:
                            yield offset + rel_offset, llm_grid_h, llm_grid_w
                        continue

                    # If EVS is enabled but mask is missing, this indicates a bug
                    # in the prompt processing pipeline. The is_embed mask should
                    # always be present when video_pruning_rate > 0.
                    raise RuntimeError(
                        f"EVS is enabled (pruning_rate={self.video_pruning_rate}) "
                        "but is_embed mask is missing from mm_position. "
                        "This indicates a bug in prompt processing."
                    )
                else:
                    # Non-EVS mode: Use original logic with input_tokens.index()
                    for _ in range(t):
                        offset = input_tokens.index(video_token_id, offset)
                        yield offset, llm_grid_h, llm_grid_w
                        offset += llm_grid_h * llm_grid_w
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            else:
                raise ValueError(f"Unsupported modality: {mm_feature.modality}")

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    def _get_evs_mask_segments(
        self, mm_position: PlaceholderRange, expected_frames: int
    ) -> list[torch.Tensor] | None:
        """Extract contiguous segments from EVS is_embed mask.

        The EVS (Efficient Video Sampling) mask marks which placeholder
        positions should be filled with video embeddings. This method splits
        the mask into contiguous segments, where each segment represents one
        retained frame.

        This is a pure function - it does not modify any state and always
        returns the same output for the same input (idempotent).

        Args:
            mm_position: MultiModal position containing the is_embed mask
            expected_frames: Expected number of frame segments

        Returns:
            List of tensors, each containing indices for one frame segment,
            or None if EVS is not enabled or validation fails.
        """
        is_embed_mask = getattr(mm_position, "is_embed", None)
        if is_embed_mask is None:
            return None

        # Find all True positions in the mask
        mask_tensor = torch.as_tensor(is_embed_mask, dtype=torch.bool).view(-1)
        true_indices = torch.nonzero(mask_tensor, as_tuple=False).flatten()
        if true_indices.numel() == 0:
            return None

        # Split into contiguous segments (where diff > 1 indicates a gap)
        if true_indices.numel() == 1:
            segments = [true_indices]
        else:
            diffs = torch.diff(true_indices)
            split_points = torch.nonzero(diffs != 1, as_tuple=False).flatten()
            if split_points.numel() == 0:
                segments = [true_indices]
            else:
                segments = torch.tensor_split(
                    true_indices, split_points.add(1).tolist()
                )

        # Validate segment count matches expected frames
        if len(segments) < expected_frames:
            logger.debug(
                "EVS mask segments (%d) do not match expected frames (%d)",
                len(segments),
                expected_frames,
            )
            return None

        return segments[:expected_frames]

    def _extract_frame_offsets_from_mask(
        self, mm_position: PlaceholderRange, expected_frames: int
    ) -> list[int] | None:
        """Return relative offsets for each EVS-retained frame.

        The prompt processor stores a boolean mask inside ``mm_position`` that
        marks which placeholder locations should be populated with video
        embeddings. By splitting that mask into contiguous runs we can recover
        the start of every retained frame without probing ``input_tokens``.

        Args:
            mm_position: MultiModal position containing the is_embed mask
            expected_frames: Expected number of frames

        Returns:
            List of starting offsets (relative to mm_position) for each frame,
            or None if EVS is not enabled.
        """
        segments = self._get_evs_mask_segments(mm_position, expected_frames)
        if segments is None:
            return None

        return [int(segment[0].item()) for segment in segments]

    def _get_actual_frame_token_counts(
        self, mm_position: PlaceholderRange, expected_frames: int
    ) -> list[int] | None:
        """Return actual token count for each EVS-retained frame.

        This function calculates the actual number of tokens per frame by
        analyzing the is_embed mask, accounting for EVS pruning. Each frame
        may have a different token count due to content-aware pruning.

        Args:
            mm_position: MultiModal position containing the is_embed mask
            expected_frames: Expected number of frames

        Returns:
            List of token counts for each frame, or None if EVS is not enabled.
        """
        segments = self._get_evs_mask_segments(mm_position, expected_frames)
        if segments is None:
            return None

        return [len(seg) for seg in segments]

    def recompute_mrope_positions(
        self,
        input_ids: list[int],
        multimodal_embeddings: tuple[torch.Tensor, ...],
        mrope_positions: torch.LongTensor,
        num_computed_tokens: int,
    ) -> tuple[tuple[torch.Tensor, ...], torch.Tensor, int]:
        """
        Update part of input mrope positions (starting with
        num_computed_tokens index). Original mrope_positions are computed
        for unpruned sequence and becomes incorrect once pruning occurs,
        so once we prune media tokens we should reflect this in the
        mrope_positions before we feed it to LLM.

        Args:
            input_ids: (N,) All input tokens of the prompt (Containing
                entire sequence).
            multimodal_embeddings: Tuple of multimodal embeddings.
            mrope_positions: Existing mrope positions (3, N) for entire
                sequence
            num_computed_tokens: A number of computed tokens so far.

        Returns:
            Tuple of (multimodal_embeddings, mrope_positions,
                mrope_position_delta).
        """
        image_token_id = self.config.image_token_id
        video_token_id = self.config.video_token_id
        vision_start_token_id = self.config.vision_start_token_id

        # Device
        device = (
            multimodal_embeddings[0].device
            if len(multimodal_embeddings)
            else mrope_positions.device
        )

        # Tensors
        input_ids_t = torch.as_tensor(input_ids, device=device, dtype=torch.long)

        mm_embeddings_out = [mm[:, :-4] for mm in multimodal_embeddings]
        mm_embeddings_pos = [
            mm[:, -4:].permute(1, 0).long() for mm in multimodal_embeddings
        ]

        positions, mrope_positions_delta = recompute_mrope_positions(
            input_ids_t,
            mm_embeddings_pos,
            mrope_positions,
            num_computed_tokens,
            vision_start_token_id,
            image_token_id,
            video_token_id,
        )

        return tuple(mm_embeddings_out), positions, mrope_positions_delta

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    def get_mrope_input_positions(
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        self,
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        input_tokens: list[int],
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        mm_features: list[MultiModalFeatureSpec],
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    ) -> tuple[torch.Tensor, int]:
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        # Pre-collect actual frame token counts for EVS mode
        frame_token_counts_map = {}
        for mm_feature in mm_features:
            if mm_feature.modality == "video":
                is_evs_enabled = (
                    hasattr(self, "video_pruning_rate")
                    and self.video_pruning_rate is not None
                    and self.video_pruning_rate > 0.0
                )
                if is_evs_enabled:
                    t = mm_feature.data["video_grid_thw"].data.tolist()[0]
                    token_counts = self._get_actual_frame_token_counts(
                        mm_feature.mm_position, t
                    )
                    assert token_counts is not None, (
                        "EVS enabled but failed to extract frame token counts "
                        "from is_embed mask"
                    )
                    frame_token_counts_map[mm_feature.mm_position.offset] = token_counts

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        llm_pos_ids_list = []
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        st = 0
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        frame_counts_idx = {}

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        for offset, llm_grid_h, llm_grid_w in self.iter_mm_grid_hw(
            input_tokens, mm_features
        ):
            text_len = offset - st
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            st_idx = llm_pos_ids_list[-1].max() + 1 if len(llm_pos_ids_list) > 0 else 0
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            # Determine actual token count for this frame
            base_offset = None
            for feat_offset in frame_token_counts_map:
                if offset >= feat_offset:
                    base_offset = feat_offset

            if base_offset is not None:
                # EVS mode: use actual token count from is_embed mask
                assert base_offset in frame_token_counts_map, (
                    f"Found base_offset {base_offset} but not in frame_token_counts_map"
                )

                if base_offset not in frame_counts_idx:
                    frame_counts_idx[base_offset] = 0

                counts = frame_token_counts_map[base_offset]
                idx = frame_counts_idx[base_offset]

                assert idx < len(counts), (
                    f"EVS frame index {idx} out of range (total frames: {len(counts)})"
                )

                actual_frame_tokens = counts[idx]
                frame_counts_idx[base_offset] += 1
            else:
                # Non-EVS mode (or image): use theoretical grid size
                actual_frame_tokens = llm_grid_h * llm_grid_w

            # Add text segment
            text_positions = (
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                np.broadcast_to(np.arange(text_len), (3, text_len)) + st_idx
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            )
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            llm_pos_ids_list.append(text_positions)
            st_idx += text_len
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            # Add frame segment with actual token count (not theoretical)
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            grid_indices = np.indices((1, llm_grid_h, llm_grid_w)).reshape(3, -1)
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            # Only take the first actual_frame_tokens positions
            frame_positions = grid_indices[:, :actual_frame_tokens] + st_idx
            llm_pos_ids_list.append(frame_positions)

            # Update st using actual token count
            st = offset + actual_frame_tokens
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        # Handle final text segment
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        if st < len(input_tokens):
            st_idx = llm_pos_ids_list[-1].max() + 1 if len(llm_pos_ids_list) > 0 else 0
            text_len = len(input_tokens) - st
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            final_text_positions = (
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                np.broadcast_to(np.arange(text_len), (3, text_len)) + st_idx
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            )
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            llm_pos_ids_list.append(final_text_positions)
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        llm_positions = np.concatenate(llm_pos_ids_list, axis=1).reshape(3, -1)
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        mrope_position_delta = (llm_positions.max() + 1 - len(input_tokens)).item()
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        return torch.from_numpy(llm_positions), mrope_position_delta
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    def embed_multimodal(self, **kwargs: object) -> MultiModalEmbeddings | None:
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        mm_input_by_modality = self._parse_and_validate_multimodal_inputs(**kwargs)
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        if not mm_input_by_modality:
            return None

        # The result multimodal_embeddings is tuple of tensors, with each
        # tensor correspoending to a multimodal data item (image or video).
        multimodal_embeddings: tuple[torch.Tensor, ...] = ()

        # NOTE: It is important to iterate over the keys in this dictionary
        # to preserve the order of the modalities.
        for modality in mm_input_by_modality:
            multimodal_input = mm_input_by_modality[modality]
            if modality == "image":
1904
                image_embeddings = self._process_image_input(multimodal_input)
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                if self.is_multimodal_pruning_enabled:
                    image_embeddings = self._postprocess_image_embeds_evs(
                        image_embeddings, multimodal_input
                    )
1909
                multimodal_embeddings += tuple(image_embeddings)
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            if modality == "video":
                video_embeddings = self._process_video_input(multimodal_input)
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                if self.is_multimodal_pruning_enabled:
                    video_embeddings = self._postprocess_video_embeds_evs(
                        video_embeddings, multimodal_input
                    )
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                multimodal_embeddings += tuple(video_embeddings)
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        return multimodal_embeddings

    def _compute_deepstack_embeds(
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        self,
        inputs_embeds: torch.Tensor,
        multimodal_embeddings: MultiModalEmbeddings,
        is_multimodal: torch.Tensor,
    ) -> tuple[torch.Tensor, MultiModalEmbeddings]:
        visual_lens = [len(x) for x in multimodal_embeddings]
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        multimodal_embeddings_cat = torch.cat(multimodal_embeddings, dim=0)

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        (
            multimodal_embeddings_main,
            multimodal_embeddings_multiscale,
        ) = torch.split(
            multimodal_embeddings_cat,
            [self.visual_dim, self.multiscale_dim],
            dim=-1,
        )
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        multimodal_embeddings = torch.split(
            multimodal_embeddings_main, visual_lens, dim=0
        )
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        multimodal_embeddings_multiscale = torch.split(
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            multimodal_embeddings_multiscale, visual_lens, dim=0
        )
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        deepstack_input_embeds = inputs_embeds.new_zeros(
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            inputs_embeds.size(0), self.deepstack_num_level * inputs_embeds.size(1)
        )
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        deepstack_input_embeds = _merge_multimodal_embeddings(
            inputs_embeds=deepstack_input_embeds,
            multimodal_embeddings=multimodal_embeddings_multiscale,
            is_multimodal=is_multimodal,
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        )
        deepstack_input_embeds = deepstack_input_embeds.view(
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            inputs_embeds.shape[0], self.deepstack_num_level, self.visual_dim
        )
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        deepstack_input_embeds = deepstack_input_embeds.permute(1, 0, 2)
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        return deepstack_input_embeds, multimodal_embeddings

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    def embed_input_ids(
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        self,
        input_ids: torch.Tensor,
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        multimodal_embeddings: MultiModalEmbeddings | None = None,
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        *,
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        is_multimodal: torch.Tensor | None = None,
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        handle_oov_mm_token: bool = False,
1967
    ) -> torch.Tensor:
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        inputs_embeds = self._embed_text_input_ids(
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            input_ids,
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            self.language_model.embed_input_ids,
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            is_multimodal=is_multimodal,
            handle_oov_mm_token=handle_oov_mm_token,
        )

        if multimodal_embeddings is None or len(multimodal_embeddings) == 0:
            return inputs_embeds

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        is_multimodal = _require_is_multimodal(is_multimodal)
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        if self.use_deepstack:
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            (
                deepstack_input_embeds,
                multimodal_embeddings,
            ) = self._compute_deepstack_embeds(
                inputs_embeds=inputs_embeds,
                multimodal_embeddings=multimodal_embeddings,
                is_multimodal=is_multimodal,
            )
        else:
            deepstack_input_embeds = None

        inputs_embeds = _merge_multimodal_embeddings(
            inputs_embeds=inputs_embeds,
            multimodal_embeddings=multimodal_embeddings,
            is_multimodal=is_multimodal,
        )

        if deepstack_input_embeds is not None:
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            self._set_deepstack_input_embeds(deepstack_input_embeds)

        return inputs_embeds

    def forward(
        self,
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        input_ids: torch.Tensor | None,
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        positions: torch.Tensor,
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        intermediate_tensors: IntermediateTensors | None = None,
        inputs_embeds: torch.Tensor | None = None,
2009
        **kwargs: object,
2010
    ) -> torch.Tensor | IntermediateTensors:
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        """Run forward pass for Qwen3VL.

        Args:
            input_ids: Flattened (concatenated) input_ids corresponding to a
                batch.
            positions: Flattened (concatenated) position ids corresponding to a
                batch.
                **NOTE**: If mrope is enabled (default setting for Qwen3VL
                opensource models), the shape will be `(3, seq_len)`,
                otherwise it will be `(seq_len,).
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            intermediate_tensors: Intermediate tensors from previous pipeline
                stages.
            inputs_embeds: Pre-computed input embeddings.
            **kwargs: Additional keyword arguments including:
                - pixel_values: Pixel values to be fed to a model.
                    `None` if no images are passed.
                - image_grid_thw: Tensor `(n_images, 3)` of image 3D grid in
                    LLM. `None` if no images are passed.
                - pixel_values_videos: Pixel values of videos to be fed to a
                    model. `None` if no videos are passed.
                - video_grid_thw: Tensor `(n_videos, 3)` of video 3D grid in
                    LLM. `None` if no videos are passed.
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        """

        if intermediate_tensors is not None:
            inputs_embeds = None

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        if inputs_embeds is not None and get_pp_group().is_first_rank:
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            deepstack_input_embeds = self._get_deepstack_input_embeds(
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                inputs_embeds.size(0)
            )
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        else:
            deepstack_input_embeds = None

        hidden_states = self.language_model.model(
            input_ids=input_ids,
            positions=positions,
            intermediate_tensors=intermediate_tensors,
            inputs_embeds=inputs_embeds,
            # args for deepstack
            deepstack_input_embeds=deepstack_input_embeds,
        )

        if inputs_embeds is not None and get_pp_group().is_first_rank:
            self._clear_deepstack_input_embeds(inputs_embeds.size(0))

        return hidden_states

    def compute_logits(
        self,
        hidden_states: torch.Tensor,
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    ) -> torch.Tensor | None:
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        return self.language_model.compute_logits(hidden_states)
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    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
2066
        loader = AutoWeightsLoader(self)
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        return loader.load_weights(weights, mapper=self.hf_to_vllm_mapper)

    def get_mm_mapping(self) -> MultiModelKeys:
        """
        Get the module prefix in multimodal models
        """
        return MultiModelKeys.from_string_field(
            language_model="language_model",
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            connector=["visual.merger", "visual.deepstack_merger_list"],
2076
            tower_model="visual.",
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        )
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    def get_num_mm_encoder_tokens(
        self,
        num_image_tokens: int,
    ) -> int:
        hf_config = self.config
        vision_config = hf_config.vision_config
        merge_size = vision_config.spatial_merge_size

        return num_image_tokens * merge_size**2

    def get_num_mm_connector_tokens(
        self,
        num_vision_tokens: int,
    ) -> int:
        hf_config = self.config
        vision_config = hf_config.vision_config
        merge_size = vision_config.spatial_merge_size
        return num_vision_tokens // merge_size**2