# 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."""

from collections.abc import Iterable, Mapping, Sequence
from functools import partial
from itertools import islice
from typing import Any, Callable, Optional, Union

import numpy as np
import torch
import torch.nn as nn
import torch.nn.functional as F
from transformers import BatchFeature
from transformers.models.qwen2_vl import Qwen2VLImageProcessorFast
from transformers.models.qwen2_vl.image_processing_qwen2_vl import (
    smart_resize as image_smart_resize,
)
from transformers.models.qwen3_vl import Qwen3VLProcessor, Qwen3VLVideoProcessor
from transformers.models.qwen3_vl.configuration_qwen3_vl import (
    Qwen3VLConfig,
    Qwen3VLVisionConfig,
)
from transformers.models.qwen3_vl.video_processing_qwen3_vl import (
    smart_resize as video_smart_resize,
)
from transformers.video_utils import VideoMetadata

from vllm.attention.backends.registry import _Backend
from vllm.attention.layer import check_upstream_fa_availability
from vllm.compilation.decorators import support_torch_compile
from vllm.config import VllmConfig
from vllm.config.multimodal import BaseDummyOptions, VideoDummyOptions
from vllm.distributed import get_pp_group
from vllm.logger import init_logger
from vllm.model_executor.layers.activation import _ACTIVATION_REGISTRY
from vllm.model_executor.layers.linear import ColumnParallelLinear, RowParallelLinear
from vllm.model_executor.layers.logits_processor import LogitsProcessor
from vllm.model_executor.layers.quantization import QuantizationConfig
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
from vllm.multimodal.inputs import (
    MultiModalDataDict,
    MultiModalFieldConfig,
    MultiModalKwargsItem,
    MultiModalKwargsItems,
    VideoItem,
)
from vllm.multimodal.parse import ImageSize, MultiModalDataItems, MultiModalDataParser
from vllm.multimodal.processing import (
    BaseMultiModalProcessor,
    PromptReplacement,
    PromptUpdate,
    PromptUpdateDetails,
)
from vllm.multimodal.profiling import BaseDummyInputsBuilder
from vllm.sequence import IntermediateTensors
from vllm.utils import is_list_of

from .interfaces import (
    MultiModalEmbeddings,
    SupportsLoRA,
    SupportsMultiModal,
    SupportsPP,
)
from .qwen2_5_vl import (
    Qwen2_5_VisionAttention,
    Qwen2_5_VisionRotaryEmbedding,
    Qwen2_5_VLImageEmbeddingInputs,
    Qwen2_5_VLImageInputs,
    Qwen2_5_VLImagePixelInputs,
    Qwen2_5_VLVideoEmbeddingInputs,
    Qwen2_5_VLVideoInputs,
    Qwen2_5_VLVideoPixelInputs,
)
from .qwen2_vl import Qwen2VLProcessingInfo
from .qwen3 import Qwen3ForCausalLM, Qwen3Model
from .utils import (
    AutoWeightsLoader,
    PPMissingLayer,
    WeightsMapper,
    _merge_multimodal_embeddings,
    maybe_prefix,
)
from .vision import get_vit_attn_backend, run_dp_sharded_mrope_vision_model

logger = init_logger(__name__)

# Official recommended max pixels is 24576 * 32 * 32
_MAX_FRAMES_PER_VIDEO = 24576


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)
        self.proj = nn.Conv3d(
            in_channels,
            hidden_size,
            kernel_size=kernel_size,
            stride=kernel_size,
            bias=True,
        )

    def forward(self, x: torch.Tensor) -> torch.Tensor:
        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)
        return x


class Qwen3_VisionMLP(nn.Module):
    def __init__(
        self,
        in_features: int,
        hidden_features: int,
        bias: bool = False,
        act_fn: Callable[[torch.Tensor], torch.Tensor] = F.silu,
        quant_config: Optional[QuantizationConfig] = None,
        prefix: str = "",
        use_data_parallel: bool = False,
    ):
        super().__init__()
        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,
        )
        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,
        norm_layer: Optional[Callable[[int], nn.Module]] = None,
        quant_config: Optional[QuantizationConfig] = None,
        prefix: str = "",
        use_data_parallel: bool = False,
        attn_backend: _Backend = _Backend.TORCH_SDPA,
        use_upstream_fa: bool = False,
    ) -> 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)
        self.attn = Qwen2_5_VisionAttention(
            embed_dim=dim,
            num_heads=num_heads,
            projection_size=dim,
            quant_config=quant_config,
            prefix=f"{prefix}.attn",
            use_data_parallel=use_data_parallel,
            attn_backend=attn_backend,
            use_upstream_fa=use_upstream_fa,
        )
        self.mlp = Qwen3_VisionMLP(
            dim,
            mlp_hidden_dim,
            act_fn=act_fn,
            bias=True,
            quant_config=quant_config,
            prefix=f"{prefix}.mlp",
            use_data_parallel=use_data_parallel,
        )

    def forward(
        self,
        x: torch.Tensor,
        cu_seqlens: torch.Tensor,
        rotary_pos_emb: torch.Tensor,
        max_seqlen: Optional[int] = None,  # Only used for Flash Attention
        seqlens: Optional[list[int]] = None,  # Only used for xFormers
    ) -> torch.Tensor:
        x = x + self.attn(
            self.norm1(x),
            cu_seqlens=cu_seqlens,
            rotary_pos_emb=rotary_pos_emb,
            max_seqlen=max_seqlen,
            seqlens=seqlens,
        )

        x = x + self.mlp(self.norm2(x))
        return x


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

    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,
        quant_config: Optional[QuantizationConfig] = None,
        prefix: str = "",
        use_data_parallel: bool = False,
    ) -> 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
        self.use_data_parallel = use_data_parallel
        self.num_grid_per_side = int(self.num_position_embeddings**0.5)

        # NOTE: This is used for creating empty tensor for all_gather for
        # DP ViT. Here out_hidden_size is enlarged due to deepstack
        self.out_hidden_size = vision_config.out_hidden_size * (
            1 + len(self.deepstack_visual_indexes)
        )

        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,
        )

        self.pos_embed = nn.Embedding(self.num_position_embeddings, self.hidden_size)

        norm_layer = partial(nn.LayerNorm, eps=norm_eps)
        head_dim = self.hidden_size // self.num_heads
        self.rotary_pos_emb = Qwen2_5_VisionRotaryEmbedding(head_dim // 2)

        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",
            use_data_parallel=use_data_parallel,
        )

        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}",
                    use_data_parallel=use_data_parallel,
                )
                for layer_idx in range(len(self.deepstack_visual_indexes))
            ]
        )

        self.attn_backend = get_vit_attn_backend(
            head_size=head_dim, dtype=torch.get_default_dtype()
        )
        use_upstream_fa = False
        if (
            self.attn_backend != _Backend.FLASH_ATTN
            and self.attn_backend != _Backend.ROCM_AITER_FA
            and check_upstream_fa_availability(torch.get_default_dtype())
        ):
            self.attn_backend = _Backend.FLASH_ATTN
            use_upstream_fa = True

        if self.attn_backend not in {
            _Backend.FLASH_ATTN,
            _Backend.TORCH_SDPA,
            _Backend.XFORMERS,
            _Backend.ROCM_AITER_FA,
        }:
            raise RuntimeError(
                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}",
                    use_data_parallel=use_data_parallel,
                    attn_backend=self.attn_backend,
                    use_upstream_fa=use_upstream_fa,
                )
                for layer_idx in range(vision_config.depth)
            ]
        )

    @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

    def rot_pos_emb(self, grid_thw):
        pos_ids = []
        # Support both Tensor and list inputs for DP path
        if isinstance(grid_thw, list):
            grid_list = grid_thw
            max_grid_size = max(max(h, w) for _, h, w in grid_list)
        else:
            grid_list = grid_thw.tolist()
            max_grid_size = int(grid_thw[:, 1:].max().item())
        for t, h, w in grid_list:
            hpos_ids = torch.arange(h).unsqueeze(1).expand(-1, w)
            hpos_ids = hpos_ids.reshape(
                h // self.spatial_merge_size,
                self.spatial_merge_size,
                w // self.spatial_merge_size,
                self.spatial_merge_size,
            )
            hpos_ids = hpos_ids.permute(0, 2, 1, 3)
            hpos_ids = hpos_ids.flatten()

            wpos_ids = torch.arange(w).unsqueeze(0).expand(h, -1)
            wpos_ids = wpos_ids.reshape(
                h // self.spatial_merge_size,
                self.spatial_merge_size,
                w // self.spatial_merge_size,
                self.spatial_merge_size,
            )
            wpos_ids = wpos_ids.permute(0, 2, 1, 3)
            wpos_ids = wpos_ids.flatten()
            pos_ids.append(torch.stack([hpos_ids, wpos_ids], dim=-1).repeat(t, 1))
        pos_ids = torch.cat(pos_ids, dim=0)
        rotary_pos_emb_full = self.rotary_pos_emb(max_grid_size)
        rotary_pos_emb = rotary_pos_emb_full[pos_ids].flatten(1)
        return rotary_pos_emb

    def fast_pos_embed_interpolate(self, grid_thw: list[list[int]]) -> torch.Tensor:
        num_grid_per_side = self.num_grid_per_side
        m_size = self.spatial_merge_size
        hidden_dim = self.pos_embed.embedding_dim

        outputs = []
        for t, h, w in grid_thw:
            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
            )

            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

            # Create meshgrid view for all h, w vars
            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")
            h_floor_grid_idx = h_floor_grid * num_grid_per_side
            h_ceil_grid_idx = h_ceil_grid * num_grid_per_side

            # 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
            w00 = 1 - dh_grid - dw_grid + w11

            idx00 = h_floor_grid_idx + w_floor_grid
            idx01 = h_floor_grid_idx + w_ceil_grid
            idx10 = h_ceil_grid_idx + w_floor_grid
            idx11 = h_ceil_grid_idx + w_ceil_grid

            indices = torch.stack([idx00, idx01, idx10, idx11], dim=0).reshape(4, -1)
            weights = torch.stack([w00, w01, w10, w11], dim=0).reshape(4, -1, 1)
            weights = weights.to(dtype=self.dtype, device=self.device)

            embeds = self.pos_embed(indices)
            weighted_embeds = embeds * weights
            p0, p1, p2, p3 = weighted_embeds.unbind(dim=0)
            combined = p0 + p1 + p2 + p3

            combined = combined.view(h * w, hidden_dim)
            repeated = combined.unsqueeze(0).expand(t, -1, -1).contiguous()
            repeated = repeated.view(
                t, h // m_size, m_size, w // m_size, m_size, hidden_dim
            )
            repeated = repeated.permute(0, 1, 3, 2, 4, 5).reshape(-1, hidden_dim)
            outputs.append(repeated)

        return torch.cat(outputs, dim=0)

    def compute_attn_mask_seqlen(
        self,
        cu_seqlens: torch.Tensor,
    ) -> tuple[Optional[int], Optional[list[int]]]:
        max_seqlen, seqlens = None, None
        if (
            self.attn_backend == _Backend.FLASH_ATTN
            or self.attn_backend == _Backend.ROCM_AITER_FA
        ):
            max_seqlen = (cu_seqlens[1:] - cu_seqlens[:-1]).max().item()
        elif self.attn_backend == _Backend.XFORMERS:
            seqlens = (cu_seqlens[1:] - cu_seqlens[:-1]).tolist()
        return max_seqlen, seqlens

    def forward(
        self,
        x: torch.Tensor,
        grid_thw: list[list[int]],
    ) -> torch.Tensor:
        hidden_states = x.to(device=self.device, dtype=self.dtype)
        hidden_states = self.patch_embed(hidden_states)

        pos_embeds = self.fast_pos_embed_interpolate(grid_thw)
        hidden_states = hidden_states + pos_embeds
        rotary_pos_emb = self.rot_pos_emb(grid_thw)

        grid_thw_tensor = torch.tensor(grid_thw, device=self.device, dtype=torch.int32)

        cu_seqlens = torch.repeat_interleave(
            grid_thw_tensor[:, 1] * grid_thw_tensor[:, 2], grid_thw_tensor[:, 0]
        ).cumsum(
            dim=0,
            dtype=grid_thw_tensor.dtype if torch.jit.is_tracing() else torch.int32,
        )
        cu_seqlens = F.pad(cu_seqlens, (1, 0), value=0)

        hidden_states = hidden_states.unsqueeze(1)
        rotary_pos_emb = rotary_pos_emb.to(hidden_states.device)
        max_seqlen, seqlens = self.compute_attn_mask_seqlen(cu_seqlens)

        deepstack_feature_lists = []
        for layer_num, blk in enumerate(self.blocks):
            hidden_states = blk(
                hidden_states,
                cu_seqlens=cu_seqlens,
                rotary_pos_emb=rotary_pos_emb,
                max_seqlen=max_seqlen,
                seqlens=seqlens,
            )
            if layer_num in self.deepstack_visual_indexes:
                deepstack_merger_idx = self.deepstack_visual_indexes.index(layer_num)
                deepstack_feature = self.deepstack_merger_list[deepstack_merger_idx](
                    hidden_states
                )
                deepstack_feature_lists.append(deepstack_feature)
        hidden_states = self.merger(hidden_states)
        hidden_states = torch.cat(
            [hidden_states] + deepstack_feature_lists, dim=1
        )  # [seq_len, hidden_size * (1 + depth_of_deepstack)]
        return hidden_states

    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
        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:
            for param_name, weight_name, shard_id in stacked_params_mapping:
                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]
                weight_loader = getattr(param, "weight_loader", default_weight_loader)
                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,
        )

    def get_tokenizer(self):
        return self.ctx.tokenizer

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

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

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

        is_video = isinstance(image_processor, Qwen3VLVideoProcessor)

        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:
            if is_video:
                smart_resize = video_smart_resize
                extra_kwargs = {
                    "num_frames": num_frames,
                    "temporal_factor": temporal_patch_size,
                }
            else:
                smart_resize = image_smart_resize
                extra_kwargs = {}
            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"],
                **extra_kwargs,
            )
            preprocessed_size = ImageSize(width=resized_width, height=resized_height)
        else:
            preprocessed_size = ImageSize(width=image_width, height=image_height)

        padded_num_frames = num_frames + num_frames % temporal_patch_size

        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

    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
        )

    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(
            seq_len, mm_counts, max_frames_per_video=_MAX_FRAMES_PER_VIDEO
        )

    def get_max_video_tokens(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
    ) -> int:
        target_width, target_height = self.get_image_size_with_most_features()
        video_soft_tokens = self.get_num_video_tokens(
            image_width=target_width,
            image_height=target_height,
            num_frames=self.get_num_frames_with_most_features(seq_len, mm_counts),
            image_processor=None,
        )

        # NOTE: By default in Qwen3-VL, one video token is converted to
        # "<{timestamp} seconds>" (on average 9.5 tokens) + vision_start_token + video_token + vision_end_token # noqa: E501
        formatted_video_soft_tokens = video_soft_tokens * 12.5
        return int(formatted_video_soft_tokens)

    def _calculate_timestamps(
        self, indices: list[int] | torch.Tensor, video_fps: float, merge_size: int
    ):
        if not isinstance(indices, list):
            indices = indices.tolist()
        if len(indices) % merge_size != 0:
            # don't update metadata's frames_indices directly
            indices = indices + [indices[-1]] * (merge_size - len(indices) % merge_size)
        timestamps = [idx / video_fps for idx in indices]
        timestamps = [
            (timestamps[i] + timestamps[i + merge_size - 1]) / 2
            for i in range(0, len(timestamps), merge_size)
        ]
        return timestamps

    def _get_video_second_idx(
        self,
        metadata: dict[str, Any],
        out_item: MultiModalKwargsItem,
        do_sample_frames: Optional[bool] = None,
        sampled_fps: Optional[float] = None,
    ) -> list[int]:
        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.
            video_fps = sampled_fps if sampled_fps else video_processor.fps
            total_num_frames = metadata["total_num_frames"]
            num_frames = int(total_num_frames / metadata["fps"] * video_fps)
            num_frames = min(
                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()
            )
        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],
        mm_options: Optional[Mapping[str, BaseDummyOptions]] = None,
    ) -> MultiModalDataDict:
        num_images = mm_counts.get("image", 0)
        num_videos = mm_counts.get("video", 0)
        image_overrides = mm_options.get("image") if mm_options else None
        video_overrides = mm_options.get("video") if mm_options else None

        target_width, target_height = self.info.get_image_size_with_most_features()
        target_num_frames = self.info.get_num_frames_with_most_features(
            seq_len, mm_counts
        )

        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",
                        num_frames_override,
                        target_num_frames,
                    )
                if num_frames_override < 2:
                    logger.warning(
                        "video.num_frames override (%d) cannot be less "
                        "than 2, will be ignored",
                        num_frames_override,
                    )
                target_num_frames = min(target_num_frames, num_frames_override)
        target_num_frames = max(target_num_frames, 2)

        target_video_size, _ = self.info._get_vision_info(
            image_width=target_width,
            image_height=target_height,
            num_frames=target_num_frames,
            image_processor=self.info.get_video_processor(),
        )
        # NOTE: we need to do this check here since Qwen3-VL resizes video
        # frames depending on how many frames there are.
        width, height = target_video_size.width, target_video_size.height
        if video_overrides:
            assert isinstance(video_overrides, VideoDummyOptions)
            width_override = video_overrides.width
            if width_override:
                if width_override > width:
                    logger.warning(
                        "video.width override (%d) exceeds model's "
                        "maximum width (%d), will be ignored",
                        width_override,
                        width,
                    )
                width = min(width, width_override)
            height_override = video_overrides.height
            if height_override:
                if height_override > height:
                    logger.warning(
                        "video.height override (%d) exceeds model's "
                        "maximum height (%d), will be ignored",
                        height_override,
                        height,
                    )
                height = min(height, height_override)

        return {
            "image": self._get_dummy_images(
                width=target_width,
                height=target_height,
                num_images=num_images,
                overrides=image_overrides,
            ),
            "video": self._get_dummy_videos(
                width=width,
                height=height,
                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


class Qwen3VLMultiModalProcessor(BaseMultiModalProcessor[Qwen3VLProcessingInfo]):
    def _get_data_parser(self) -> MultiModalDataParser:
        return MultiModalDataParser(video_needs_metadata=True)

    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
        # are processed into serval image patches
        if (
            "videos" in mm_data
            and isinstance(mm_data["videos"], list)
            and len(mm_data["videos"]) > 0
        ):
            video_grid_thw_lst = []
            pixel_values_videos_lst = []

            for item_idx, item in enumerate(mm_data.pop("videos", [])):
                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(
                        "do_sample_frames", False
                    )

                metadata = VideoMetadata(
                    **{k: metadata[k] for k in metadata if k != "do_sample_frames"}
                )

                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")
                video_placeholder = processor.tokenizer.batch_decode(input_ids)[0]
                prompt = prompt.replace(
                    "<|vision_start|><|video_pad|><|vision_end|>",
                    video_placeholder,
                    1,
                )

                video_grid_thw_lst.append(video_outputs["video_grid_thw"])
                pixel_values_videos_lst.append(video_outputs["pixel_values_videos"])
            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]:
        image_grid_thw = hf_inputs.get("image_grid_thw", torch.empty((0, 3)))
        image_grid_sizes = image_grid_thw.prod(-1)

        video_grid_thw = hf_inputs.get("video_grid_thw", torch.empty((0, 3)))
        video_grid_sizes = video_grid_thw.prod(-1)

        return dict(
            pixel_values=MultiModalFieldConfig.flat_from_sizes(
                "image", image_grid_sizes
            ),
            image_embeds=MultiModalFieldConfig.flat_from_sizes(
                "image", image_grid_sizes
            ),
            image_grid_thw=MultiModalFieldConfig.batched("image"),
            pixel_values_videos=MultiModalFieldConfig.flat_from_sizes(
                "video", video_grid_sizes
            ),
            video_embeds=MultiModalFieldConfig.flat_from_sizes(
                "video", video_grid_sizes
            ),
            video_grid_thw=MultiModalFieldConfig.batched("video"),
        )

    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)
        image_processor = self.info.get_image_processor(**hf_processor_mm_kwargs)
        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(
                metadata, out_item, do_sample_frames, sampled_fps
            )

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

            frames_idx_token = [
                tokenizer.encode(f"<{curr_time:.1f} seconds>", add_special_tokens=False)
                for curr_time in timestamps
            ]
            num_tokens_per_frame = int(grid_thw[1:].prod()) // merge_length
            placeholder = []
            for frame_idx in frames_idx_token:
                placeholder.extend(frame_idx)
                placeholder.extend(
                    [vision_start_token_id]
                    + [video_token_id] * num_tokens_per_frame
                    + [vision_end_token_id]
                )
            return PromptUpdateDetails.select_token_id(placeholder, video_token_id)

        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
        "deepstack_input_embeds": 0,
    }
)
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(
                vllm_config.model_config.hf_config.vision_config.deepstack_visual_indexes
            ), (
                "start_layer should be greater than or equal to "
                "len(deepstack_visual_indexes)"
            )

    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
        intermediate_tensors: Optional[IntermediateTensors] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        # args for deepstack
        deepstack_input_embeds: Optional[IntermediateTensors] = None,
    ) -> Union[torch.Tensor, IntermediateTensors]:
        if get_pp_group().is_first_rank:
            if inputs_embeds is not None:
                hidden_states = inputs_embeds
            else:
                hidden_states = self.get_input_embeddings(input_ids)
            residual = None
        else:
            assert intermediate_tensors is not None
            hidden_states = intermediate_tensors["hidden_states"]
            residual = intermediate_tensors["residual"]
        for layer_idx, layer in islice(
            enumerate(self.layers), self.start_layer, self.end_layer
        ):
            hidden_states, residual = layer(
                positions,
                hidden_states,
                residual,
            )

            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}"]
                )

        if not get_pp_group().is_last_rank:
            return IntermediateTensors(
                {"hidden_states": hidden_states, "residual": residual}
            )
        hidden_states, _ = self.norm(hidden_states, residual)
        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
        lora_config = vllm_config.lora_config

        self.config = config
        self.lora_config = lora_config

        self.quant_config = quant_config
        self.model = Qwen3LLMModel(vllm_config=vllm_config, prefix=prefix)

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

        self.logits_processor = LogitsProcessor(config.vocab_size)

        self.make_empty_intermediate_tensors = (
            self.model.make_empty_intermediate_tensors
        )


@MULTIMODAL_REGISTRY.register_processor(
    Qwen3VLMultiModalProcessor,
    info=Qwen3VLProcessingInfo,
    dummy_inputs=Qwen3VLDummyInputsBuilder,
)
class Qwen3VLForConditionalGeneration(
    nn.Module, SupportsMultiModal, SupportsLoRA, SupportsPP
):
    packed_modules_mapping = {
        "qkv_proj": [
            "q_proj",
            "k_proj",
            "v_proj",
        ],
        "gate_up_proj": [
            "gate_proj",
            "up_proj",
        ],
    }

    supports_encoder_tp_data = True

    # 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.",
        }
    )

    @classmethod
    def get_placeholder_str(cls, modality: str, i: int) -> Optional[str]:
        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
        self.use_data_parallel = multimodal_config.mm_encoder_tp_mode == "data"
        if not multimodal_config.get_limit_per_prompt(
            "image"
        ) and not multimodal_config.get_limit_per_prompt("video"):
            self.visual = None
        else:
            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"),
                use_data_parallel=self.use_data_parallel,
            )

        self.language_model = Qwen3LLMForCausalLM(
            vllm_config=vllm_config, prefix=maybe_prefix(prefix, "language_model")
        )

        self.make_empty_intermediate_tensors = (
            self.language_model.make_empty_intermediate_tensors
        )

        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
        )
        # register buffer for deepstack
        if self.use_deepstack and self.visual is not None:
            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)
            ]
        else:
            self.deepstack_input_embeds = None
        self.visual_dim = config.vision_config.out_hidden_size
        self.multiscale_dim = self.visual_dim * self.deepstack_num_level

    def _get_deepstack_input_embeds(self, num_tokens: int) -> IntermediateTensors:
        # get deepstack_input_embeds from buffer, and clear the buffer
        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:
        # 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 = [
                torch.zeros(
                    num_tokens,
                    self.config.text_config.hidden_size,
                    device=self.deepstack_input_embeds[0].device,
                    dtype=self.deepstack_input_embeds[0].dtype,
                )
                for _ in range(self.deepstack_num_level)
            ]
        for idx in range(self.deepstack_num_level):
            self.deepstack_input_embeds[idx][:num_tokens].copy_(
                deepstack_input_embeds[idx]
            )

    def _clear_deepstack_input_embeds(self, num_tokens: int) -> None:
        # 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 _validate_and_reshape_mm_tensor(
        self, mm_input: object, name: str
    ) -> torch.Tensor:
        if not isinstance(mm_input, (torch.Tensor, list)):
            raise ValueError(f"Incorrect type of {name}. Got type: {type(mm_input)}")
        if isinstance(mm_input, torch.Tensor):
            if mm_input.ndim == 2:
                return mm_input
            if mm_input.ndim != 3:
                raise ValueError(
                    f"{name} should be 2D or batched 3D tensor. "
                    f"Got ndim: {mm_input.ndim} "
                    f"(shape={mm_input.shape})"
                )
            return mm_input.reshape(-1, mm_input.shape[-1])
        else:
            return torch.concat(mm_input)

    def _parse_and_validate_image_input(
        self, **kwargs: object
    ) -> Optional[Qwen2_5_VLImageInputs]:
        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:
            pixel_values = self._validate_and_reshape_mm_tensor(
                pixel_values, "image pixel values"
            )
            image_grid_thw = self._validate_and_reshape_mm_tensor(
                image_grid_thw, "image grid_thw"
            )

            if not isinstance(pixel_values, (torch.Tensor, list)):
                raise ValueError(
                    "Incorrect type of image pixel values. "
                    f"Got type: {type(pixel_values)}"
                )

            return Qwen2_5_VLImagePixelInputs(
                type="pixel_values",
                pixel_values=pixel_values,
                image_grid_thw=image_grid_thw,
            )

        if image_embeds is not None:
            image_embeds = self._validate_and_reshape_mm_tensor(
                image_embeds, "image embeds"
            )
            image_grid_thw = self._validate_and_reshape_mm_tensor(
                image_grid_thw, "image grid_thw"
            )

            if not isinstance(image_embeds, torch.Tensor):
                raise ValueError(
                    "Incorrect type of image embeddings. "
                    f"Got type: {type(image_embeds)}"
                )
            return Qwen2_5_VLImageEmbeddingInputs(
                type="image_embeds",
                image_embeds=image_embeds,
                image_grid_thw=image_grid_thw,
            )

    def _parse_and_validate_video_input(
        self, **kwargs: object
    ) -> Optional[Qwen2_5_VLVideoInputs]:
        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:
            pixel_values_videos = self._validate_and_reshape_mm_tensor(
                pixel_values_videos, "video pixel values"
            )
            video_grid_thw = self._validate_and_reshape_mm_tensor(
                video_grid_thw, "video grid_thw"
            )

            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:
            video_embeds = self._validate_and_reshape_mm_tensor(
                video_embeds, "video embeds"
            )
            video_grid_thw = self._validate_and_reshape_mm_tensor(
                video_grid_thw, "video grid_thw"
            )

            if not isinstance(video_embeds, torch.Tensor):
                raise ValueError(
                    "Incorrect type of video embeddings. "
                    f"Got type: {type(video_embeds)}"
                )
            return Qwen2_5_VLVideoEmbeddingInputs(
                type="video_embeds",
                video_embeds=video_embeds,
                video_grid_thw=video_grid_thw,
            )

    def _process_image_input(
        self, image_input: Qwen2_5_VLImageInputs
    ) -> tuple[torch.Tensor, ...]:
        grid_thw = image_input["image_grid_thw"]
        assert grid_thw.ndim == 2
        grid_thw_list = grid_thw.tolist()

        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)
            if self.use_data_parallel:
                return run_dp_sharded_mrope_vision_model(
                    self.visual, pixel_values, grid_thw_list, rope_type="rope_3d"
                )
            else:
                image_embeds = self.visual(pixel_values, grid_thw=grid_thw_list)

        # Split concatenated embeddings for each image item.
        # Using prod on grid_thw_list instead of grid_thw.prod avoids CUDA sync
        merge_size = self.visual.spatial_merge_size
        sizes = (
            torch.tensor(grid_thw_list, dtype=torch.long).prod(-1)
            // (merge_size * merge_size)
        ).tolist()
        return image_embeds.split(sizes)

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

        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(
                self.visual.dtype
            )
            if self.use_data_parallel:
                return run_dp_sharded_mrope_vision_model(
                    self.visual, pixel_values_videos, grid_thw_list, rope_type="rope_3d"
                )
            else:
                video_embeds = self.visual(pixel_values_videos, grid_thw=grid_thw_list)

        # Split concatenated embeddings for each video item.
        # Using prod on grid_thw_list instead of grid_thw.prod avoids CUDA sync
        merge_size = self.visual.spatial_merge_size
        sizes = (
            torch.tensor(grid_thw_list, dtype=torch.long).prod(-1)
            // (merge_size * merge_size)
        ).tolist()
        return video_embeds.split(sizes)

    def _parse_and_validate_multimodal_inputs(self, **kwargs: object) -> dict:
        mm_input_by_modality = {}
        for input_key in kwargs:
            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
                )
        return mm_input_by_modality

    def get_language_model(self) -> torch.nn.Module:
        return self.language_model

    def get_multimodal_embeddings(
        self, **kwargs: object
    ) -> Optional[MultiModalEmbeddings]:
        mm_input_by_modality = self._parse_and_validate_multimodal_inputs(**kwargs)
        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":
                vision_embeddings = self._process_image_input(multimodal_input)
                multimodal_embeddings += vision_embeddings
            if modality == "video":
                video_embeddings = self._process_video_input(multimodal_input)
                multimodal_embeddings += video_embeddings
        return multimodal_embeddings

    def _compute_deepstack_embeds(
        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]
        multimodal_embeddings_cat = torch.cat(multimodal_embeddings, dim=0)

        (
            multimodal_embeddings_main,
            multimodal_embeddings_multiscale,
        ) = torch.split(
            multimodal_embeddings_cat,
            [self.visual_dim, self.multiscale_dim],
            dim=-1,
        )

        multimodal_embeddings = torch.split(
            multimodal_embeddings_main, visual_lens, dim=0
        )
        multimodal_embeddings_multiscale = torch.split(
            multimodal_embeddings_multiscale, visual_lens, dim=0
        )

        deepstack_input_embeds = inputs_embeds.new_zeros(
            inputs_embeds.size(0), self.deepstack_num_level * inputs_embeds.size(1)
        )

        deepstack_input_embeds = _merge_multimodal_embeddings(
            inputs_embeds=deepstack_input_embeds,
            multimodal_embeddings=multimodal_embeddings_multiscale,
            is_multimodal=is_multimodal,
        )
        deepstack_input_embeds = deepstack_input_embeds.view(
            inputs_embeds.shape[0], self.deepstack_num_level, self.visual_dim
        )
        deepstack_input_embeds = deepstack_input_embeds.permute(1, 0, 2)

        return deepstack_input_embeds, multimodal_embeddings

    def get_input_embeddings(
        self,
        input_ids: torch.Tensor,
        multimodal_embeddings: Optional[MultiModalEmbeddings] = None,
        *,
        is_multimodal: Optional[torch.Tensor] = None,
        handle_oov_mm_token: bool = False,
    ) -> torch.Tensor:
        inputs_embeds = self._get_text_embeddings(
            input_ids,
            self.language_model.get_input_embeddings,
            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

        if is_multimodal is None:
            raise ValueError(
                "`get_input_embeddings` now requires `is_multimodal` arg, "
                "please update your model runner according to "
                "https://github.com/vllm-project/vllm/pull/16229."
            )

        if self.use_deepstack:
            (
                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:
            deepstack_input_embeds = (
                torch.zeros_like(inputs_embeds)
                .unsqueeze(0)
                .repeat(self.deepstack_num_level, 1, 1)
                .contiguous()
            )
            self._set_deepstack_input_embeds(deepstack_input_embeds)

        return inputs_embeds

    def forward(
        self,
        input_ids: torch.Tensor,
        positions: torch.Tensor,
        intermediate_tensors: Optional[IntermediateTensors] = None,
        inputs_embeds: Optional[torch.Tensor] = None,
        **kwargs: object,
    ) -> Union[torch.Tensor, IntermediateTensors]:
        """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,).
            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.
        """

        if intermediate_tensors is not None:
            inputs_embeds = None

        if (
            self.use_deepstack
            and inputs_embeds is not None
            and get_pp_group().is_first_rank
        ):
            deepstack_input_embeds = self._get_deepstack_input_embeds(
                inputs_embeds.size(0)
            )
        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,
    ) -> Optional[torch.Tensor]:
        return self.language_model.compute_logits(hidden_states)

    def load_weights(self, weights: Iterable[tuple[str, torch.Tensor]]) -> set[str]:
        skip_prefixes = []
        if self.visual is None:
            skip_prefixes.extend(["visual."])
        loader = AutoWeightsLoader(self, skip_prefixes=skip_prefixes)
        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",
            connector="model.visual.merger",
            tower_model="model.visual.",
        )
