# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
from collections.abc import Iterable, Mapping, Sequence
from functools import partial
from typing import Annotated, Literal, TypeAlias

import numpy as np
import regex as re
import torch
from einops import rearrange
from PIL import Image
from timm.layers import LayerNorm2d
from timm.layers.pos_embed import resample_abs_pos_embed
from timm.models.regnet import RegStage
from torch import nn
from transformers import BatchFeature
from transformers.modeling_outputs import BaseModelOutput
from transformers.models.qwen2_vl.configuration_qwen2_vl import Qwen2VLVisionConfig

from vllm.config import VllmConfig
from vllm.config.multimodal import BaseDummyOptions
from vllm.logger import init_logger
from vllm.multimodal import MULTIMODAL_REGISTRY
from vllm.multimodal.inputs import (
    MultiModalDataDict,
    MultiModalFieldConfig,
    MultiModalKwargsItems,
)
from vllm.multimodal.parse import ImageSize, MultiModalDataItems
from vllm.multimodal.processing import (
    BaseMultiModalProcessor,
    BaseProcessingInfo,
    PromptReplacement,
    PromptUpdate,
)
from vllm.multimodal.profiling import BaseDummyInputsBuilder
from vllm.sequence import IntermediateTensors
from vllm.utils.import_utils import resolve_obj_by_qualname
from vllm.utils.tensor_schema import TensorSchema, TensorShape

from .interfaces import MultiModalEmbeddings, SupportsMultiModal, SupportsPP
from .qwen2_vl import Qwen2VisionTransformer
from .utils import AutoWeightsLoader, init_vllm_registered_model, maybe_prefix

logger = init_logger(__name__)


class KananaVImagePixelInputs(TensorSchema):
    """
    Dimensions:
        - np: The total number of patches over all images in the batch
        - cps: Number of channels * patch_size * patch_size
        - ni: Number of images
    """

    type: Literal["pixel_values"]

    pixel_values: Annotated[
        torch.Tensor,
        TensorShape("np", "cps"),
    ]

    vision_grid_thw: Annotated[
        torch.Tensor,
        TensorShape("ni", 3),
    ]


KananaVImageInputs: TypeAlias = KananaVImagePixelInputs


def build_pos_embeds(
    config: Qwen2VLVisionConfig,
    num_input_tokens: int,
    vision_hidden_size: int,
) -> nn.Parameter | None:
    """Build positional embeddings for the visual encoder output."""
    if config.pos_emb:
        pos_emb = nn.Parameter(torch.zeros(1, num_input_tokens, vision_hidden_size))
        nn.init.trunc_normal_(pos_emb, mean=0.0, std=0.02)
    else:
        pos_emb = None

    return pos_emb


def build_mlp(
    depth: int,
    hidden_size: int,
    output_hidden_size: int,
) -> nn.Sequential:
    """Simple SiLU-activated MLP used as a projector readout."""
    layers = [nn.Linear(hidden_size, output_hidden_size)]
    for _ in range(1, depth):
        layers.append(nn.SiLU())
        layers.append(nn.Linear(output_hidden_size, output_hidden_size))
    return nn.Sequential(*layers)


class PatchMerge(nn.Module):
    """Merge neighboring patches spatially to reduce resolution."""

    def __init__(self, merge_size: int) -> None:
        super().__init__()
        self.merge_size = merge_size

    def forward(
        self,
        x: torch.Tensor,
        channel_last: bool = False,
    ) -> torch.Tensor:
        """Merge patches by `merge_size x merge_size`."""
        if channel_last:
            x = rearrange(x, "B H W D -> B D H W")
        _, _, H, W = x.shape
        merged_x = rearrange(
            x,
            "B D (H h2) (W w2) -> B (D h2 w2) H W",
            h2=self.merge_size,
            w2=self.merge_size,
        )
        return merged_x


class DynamicCAbstractor(nn.Module):
    """Dynamic C-Abstractor based on RegNet blocks."""

    def __init__(
        self,
        config: Qwen2VLVisionConfig,
        num_input_tokens: int,
    ) -> None:
        super().__init__()
        assert hasattr(config, "merge_size"), "merge_size must be provided."
        self.config = config
        self.merge_size = config.merge_size
        self.pos_emb_size = config.pos_emb_size
        if num_input_tokens == -1:
            num_input_tokens = config.pos_emb_size
        self.num_input_tokens = num_input_tokens
        self.pos_emb = build_pos_embeds(
            config, num_input_tokens, config.encoder_hidden_size
        )
        self.build_net()

    def _load_from_state_dict(self, state_dict, *args, **kwargs) -> None:
        if not state_dict:
            return

        if self.pos_emb is not None:
            key_re = re.compile(r"[\w,.]*abstractor[\w,.]*pos_emb")
            pos_emb_key = None
            for key in state_dict:
                if key_re.match(key):
                    pos_emb_key = key
                    break

            assert pos_emb_key is not None
            # update old ckpt compatible with current code
            pos_emb = state_dict[pos_emb_key]
            if pos_emb.size(1) == self.pos_emb.size(1) + 1:
                # remove obsolete first pos emb (for cls token originally)
                state_dict[pos_emb_key] = pos_emb[:, 1:]

        super()._load_from_state_dict(state_dict, *args, **kwargs)

    def build_net(self) -> None:
        encoder_hidden_size = self.config.encoder_hidden_size
        hidden_size = self.config.hidden_size
        output_hidden_size = self.config.output_hidden_size
        depth = self.config.depth
        mlp_depth = self.config.mlp_depth

        RegBlock = partial(
            RegStage,
            stride=1,
            dilation=1,
            act_layer=nn.SiLU,
            norm_layer=LayerNorm2d,
        )

        s1 = RegBlock(
            depth,
            encoder_hidden_size,
            hidden_size,
        )
        sampler = PatchMerge(merge_size=self.merge_size)
        s2 = RegBlock(
            depth,
            self.merge_size**2 * hidden_size,
            hidden_size,
        )

        if depth:
            self.net = nn.ModuleList([s1, sampler, s2])
            self.readout = build_mlp(mlp_depth, hidden_size, output_hidden_size)
        else:
            self.net = sampler
            self.readout = build_mlp(mlp_depth, encoder_hidden_size, output_hidden_size)

    def forward(
        self,
        flattened_visual_embeds: torch.Tensor,
        grid_thw: torch.Tensor,
        **unused_kwargs: object,
    ) -> BaseModelOutput:
        """Apply the dynamic abstractor over flattened visual embeddings."""
        n_token_loc = torch.prod(grid_thw, dim=1)
        split_visual_embeds = torch.split(flattened_visual_embeds, n_token_loc.tolist())

        flattened_visual_embeds = []
        for _visual_embeds, _grid_thw in zip(split_visual_embeds, grid_thw):
            T, H, W = _grid_thw
            assert T == 1, "T must be 1. Video is not supported yet."
            reshaped_visual_embeds = rearrange(
                _visual_embeds, "(t h w) d -> 1 t h w d", t=T, h=H, w=W
            )
            # remove temporal dim
            reshaped_visual_embeds = reshaped_visual_embeds[:, 0]

            if self.pos_emb is not None:
                # interpolate pos emb and add to visual embeds
                _local_pos_emb = resample_abs_pos_embed(
                    posemb=self.pos_emb,
                    old_size=tuple([int(self.pos_emb_size**0.5)] * 2),
                    new_size=(H, W),
                    num_prefix_tokens=0,
                )
                _local_pos_emb = rearrange(
                    _local_pos_emb,
                    "1 (h w) d -> 1 h w d",
                    h=H,
                    w=W,
                )
                reshaped_visual_embeds = reshaped_visual_embeds + _local_pos_emb

            reshaped_visual_embeds = self._forward(
                reshaped_visual_embeds,
                input_size=(H, W),
            )
            flattened_visual_embeds.append(reshaped_visual_embeds)
        reshaped_visual_embeds = torch.cat(flattened_visual_embeds, dim=0)
        return BaseModelOutput(last_hidden_state=reshaped_visual_embeds)

    def _forward(
        self,
        x: torch.Tensor,
        input_size: tuple[int, int],
    ) -> torch.Tensor:
        h, w = input_size
        x = rearrange(x, "1 h w d -> 1 d h w", h=h, w=w)
        if self.config.depth:
            x = self.net[0](x)
            x = self.net[1](x)
            x = self.net[2](x)
        else:
            # When depth=0, self.net is a single PatchMerge module
            x = self.net(x)
        x = rearrange(x, "1 d h w -> (h w) d")
        x = self.readout(x)
        return x


class CustomQwen2VLVE(Qwen2VisionTransformer):
    """Thin wrapper around the Qwen2-VL used as a vision encoder.

    This mirrors the original HF-based vision encoder used in Kanana-V, but
    reuses vLLM's optimized `Qwen2VisionTransformer` building blocks.
    """

    def __init__(self, config: Qwen2VLVisionConfig) -> None:
        super().__init__(
            vision_config=config,
            norm_eps=getattr(config, "rms_norm_eps", 1e-6),
            quant_config=None,
            prefix="",
        )

        # Kanana-V uses its own projector/abstractor instead of the Qwen2
        # built-in patch merger, so we drop the merger module to keep the
        # parameter set compatible with the original checkpoint.
        if hasattr(self, "merger"):
            del self.merger

    @classmethod
    def _from_config(cls, config: Qwen2VLVisionConfig) -> "CustomQwen2VLVE":
        """Drop-in replacement for the HF `_from_config` constructor."""
        return cls(config)

    def forward(
        self,
        pixel_values: torch.Tensor,
        grid_thw: torch.Tensor,
        output_hidden_states: bool | None = None,
        return_dict: bool | None = None,
    ) -> tuple | BaseModelOutput:
        """Run the vision transformer and optionally return intermediate states.

        Unlike the base `Qwen2VisionTransformer`, this wrapper exposes the
        pre-merger patch-level representations and a HF-style `BaseModelOutput`
        so that the existing projector / abstractor code can be reused.
        """
        assert return_dict, "Only return_dict=True is supported."

        # Patchify
        x = pixel_values.to(device=self.device, dtype=self.dtype)
        x = self.patch_embed(x)  # (num_patches, embed_dim)

        # Prepare grid and rotary embeddings – mirror base implementation.
        if isinstance(grid_thw, list):
            grid_thw_list = grid_thw
            grid_thw_np = np.array(grid_thw, dtype=np.int32)
        else:
            grid_thw_list = grid_thw.tolist()
            grid_thw_np = grid_thw.cpu().numpy()

        rotary_pos_emb_cos, rotary_pos_emb_sin = self.rot_pos_emb(grid_thw_list)

        # Compute cu_seqlens in numpy then move to device, same as base model.
        cu_seqlens = np.repeat(
            grid_thw_np[:, 1] * grid_thw_np[:, 2],
            grid_thw_np[:, 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).to(
            self.device,
            non_blocking=True,
        )

        # Shape to (S, B, D) with batch dimension 1 as expected by the blocks.
        x = x.unsqueeze(1)

        # Pre-compute seqlens for attention backend.
        max_seqlen = self.compute_attn_mask_seqlen(cu_seqlens)

        encoder_states = () if output_hidden_states else None

        for blk in self.blocks:
            if output_hidden_states:
                # Store patch-level states (S, D).
                encoder_states = encoder_states + (x.squeeze(1),)

            x = blk(
                x,
                cu_seqlens=cu_seqlens,
                rotary_pos_emb_cos=rotary_pos_emb_cos,
                rotary_pos_emb_sin=rotary_pos_emb_sin,
                max_seqlen=max_seqlen,
            )

        # Final hidden state at patch level (S, D).
        hidden_states = x.squeeze(1)
        if output_hidden_states:
            encoder_states = encoder_states + (hidden_states,)

        if not return_dict:
            return tuple(v for v in [hidden_states, encoder_states] if v is not None)
        return BaseModelOutput(
            last_hidden_state=hidden_states,
            hidden_states=encoder_states,
        )

    def get_num_tokens(self) -> int:
        # Not used in the current Kanana-V pipeline, kept for API compatibility.
        return -1


class KananaVProcessingInfo(BaseProcessingInfo):
    def get_supported_mm_limits(self) -> Mapping[str, int | None]:
        return {"image": None}

    def get_image_size_with_most_features(self) -> ImageSize:
        max_image_size, _ = self._get_vision_info(
            image_width=9999,
            image_height=9999,
            num_frames=1,
        )
        return max_image_size

    def _get_vision_info(
        self,
        *,
        image_width: int,
        image_height: int,
        num_frames: int = 1,
        do_resize: bool = True,
    ) -> tuple[ImageSize, int]:
        image_processor = self.ctx.get_hf_processor().image_processor
        smart_resize = resolve_obj_by_qualname(
            f"{type(image_processor).__module__}.smart_resize"
        )

        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:
            resized_height, resized_width = smart_resize(
                height=image_height,
                width=image_width,
                factor=patch_size * merge_size,
                min_pixels=image_processor.min_pixels,
                max_pixels=image_processor.max_pixels,
            )
            preprocessed_size = ImageSize(width=resized_width, height=resized_height)
        else:
            preprocessed_size = ImageSize(width=image_width, height=image_height)

        # NOTE: Frames are padded to be divisible by `temporal_patch_size`
        # https://github.com/huggingface/transformers/blob/v4.48.3/src/transformers/models/qwen2_vl/image_processing_qwen2_vl.py#L294
        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_mm_max_tokens_per_item(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
    ) -> Mapping[str, int]:
        target_width, target_height = self.get_image_size_with_most_features()
        num_vision_tokens = self._get_vision_info(
            image_width=target_width,
            image_height=target_height,
            num_frames=1,
        )[1]
        return {"image": num_vision_tokens}


class KananaVDummyInputsBuilder(BaseDummyInputsBuilder[KananaVProcessingInfo]):
    def get_dummy_text(self, mm_counts: Mapping[str, int]) -> str:
        num_images = mm_counts.get("image", 0)
        return "<image>" * num_images

    def get_dummy_mm_data(
        self,
        seq_len: int,
        mm_counts: Mapping[str, int],
        mm_options: Mapping[str, BaseDummyOptions] | None = None,
    ) -> MultiModalDataDict:
        num_images = mm_counts.get("image", 0)
        return {
            "image": self._get_dummy_images(
                width=9999, height=9999, num_images=num_images
            ),
        }


class KananaVMultiModalProcessor(BaseMultiModalProcessor[KananaVProcessingInfo]):
    """vLLM multimodal processor for Kanana-V (text + image)."""

    @property
    def media_token_id(self) -> int:
        return self.info.get_hf_config().text_config.eos_token_id + 1

    def _call_hf_processor(
        self,
        prompt: str,
        mm_data: Mapping[str, object],
        mm_kwargs: Mapping[str, object],
        tok_kwargs: Mapping[str, object],
    ) -> BatchFeature:
        """Run the underlying HF processor on text and image data."""
        # Text-only input is handled as a special case here.
        if not mm_data or not mm_data.get("images", []):
            prompt_ids = self.info.get_tokenizer().encode(prompt)
            return BatchFeature(dict(input_ids=[prompt_ids]), tensor_type="pt")

        # Images
        image_inputs = mm_data.get("images", [])
        pixel_sizes = []
        if not isinstance(image_inputs[0], Image.Image):
            image_inputs = [Image.fromarray(image) for image in image_inputs]

        image_processor = self.info.get_hf_processor().image_processor
        processor_output = [image_processor(image) for image in image_inputs]
        pixel_values = [o["pixel_values"] for o in processor_output]
        image_meta = [o["image_meta"] for o in processor_output]
        # list of dict -> dict of list
        image_meta = {k: [d[k] for d in image_meta] for k in image_meta[0]}

        for pixel_value in pixel_values:
            pixel_sizes.append(pixel_value.shape[0])
        # flattened pixel_values for single example (already includes batch dim)
        pixel_values = torch.concat(pixel_values, dim=0)

        tokenizer = self.info.get_tokenizer()
        media_token = tokenizer.convert_ids_to_tokens([self.media_token_id])[0]
        prompt_replaced = prompt.replace("<image>", media_token)
        input_ids = tokenizer.encode(prompt_replaced)
        input_ids = torch.tensor(input_ids)

        # Ensure HF output is consistent with vLLM prompt-update expectations:
        # if the HF tokenizer emits exactly 1 placeholder token per image, expand
        # it to `T*H*W` placeholder tokens per image so placeholder detection works.
        num_images = len(image_inputs)
        image_token_thw = torch.tensor(image_meta["image_token_thw"])
        per_image_token_counts = image_token_thw.prod(dim=1).tolist()
        expected_total = int(sum(int(x) for x in per_image_token_counts))

        n_placeholders = int((input_ids == self.media_token_id).sum().item())
        if n_placeholders == num_images and expected_total != num_images:
            expanded: list[int] = []
            img_i = 0
            for tok in input_ids.tolist():
                if tok == self.media_token_id and img_i < num_images:
                    expanded.extend(
                        [self.media_token_id] * int(per_image_token_counts[img_i])
                    )
                    img_i += 1
                else:
                    expanded.append(tok)
            input_ids = input_ids.new_tensor(expanded)

        combined_outputs = dict(
            # Add batch dimension to input_ids.
            input_ids=input_ids.unsqueeze(0),
            pixel_values=pixel_values,
            vision_grid_thw=torch.tensor(image_meta["vision_grid_thw"]),
            image_token_thw=torch.tensor(image_meta["image_token_thw"]),
            pixel_sizes=torch.tensor(pixel_sizes),
        )
        return BatchFeature(combined_outputs, tensor_type="pt")

    def _get_prompt_updates(
        self,
        mm_items: MultiModalDataItems,
        hf_processor_mm_kwargs: Mapping[str, object],
        out_mm_kwargs: MultiModalKwargsItems,
    ) -> Sequence[PromptUpdate]:
        def get_replacement(idx: int) -> Sequence[int]:
            out_item = out_mm_kwargs["image"][idx]
            image_token_thw = out_item["image_token_thw"].data
            assert isinstance(image_token_thw, torch.Tensor)

            num_tokens = int(image_token_thw.prod().item())
            return [self.media_token_id] * num_tokens

        return [
            PromptReplacement(
                modality="image",
                target="<image>",
                replacement=get_replacement,
            ),
        ]

    def _get_mm_fields_config(
        self,
        hf_inputs: BatchFeature,
        hf_processor_mm_kwargs: Mapping[str, object],
    ) -> Mapping[str, MultiModalFieldConfig]:
        pixel_sizes = hf_inputs.get("pixel_sizes", torch.empty(0))

        mm_fields_config = dict(
            pixel_values=MultiModalFieldConfig.flat_from_sizes("image", pixel_sizes),
            vision_grid_thw=MultiModalFieldConfig.batched("image"),
            image_token_thw=MultiModalFieldConfig.batched("image"),
        )
        return mm_fields_config


@MULTIMODAL_REGISTRY.register_processor(
    KananaVMultiModalProcessor,
    info=KananaVProcessingInfo,
    dummy_inputs=KananaVDummyInputsBuilder,
)
class KananaVForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
    @classmethod
    def get_placeholder_str(cls, modality: str, i: int) -> str | None:
        if modality.startswith("image"):
            return "<image>"
        else:
            raise ValueError(f"Unsupported modality: {modality}")

    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
        super().__init__()

        config = vllm_config.model_config.hf_config
        self.config = config

        self.vision_model = CustomQwen2VLVE._from_config(config.vision_config)
        self.abstractor = DynamicCAbstractor(
            config.projector_config, num_input_tokens=self.vision_model.get_num_tokens()
        )
        self.language_model = init_vllm_registered_model(
            vllm_config=vllm_config,
            hf_config=config.text_config,
            prefix=maybe_prefix(prefix, "model"),
            architectures=["LlamaForCausalLM"],
        )
        self.make_empty_intermediate_tensors = (
            self.language_model.make_empty_intermediate_tensors
        )

    def _parse_and_validate_image_input(
        self, **kwargs: object
    ) -> KananaVImageInputs | None:
        pixel_values = kwargs.pop("pixel_values", None)
        vision_grid_thw = kwargs.pop("vision_grid_thw", None)

        if pixel_values is None:
            return None

        if vision_grid_thw is None:
            raise ValueError(
                "vision_grid_thw is required when pixel_values is provided"
            )

        # Normalize pixel_values to 2D tensor (num_patches, channels*patch*patch)
        if isinstance(pixel_values, torch.Tensor):
            if pixel_values.ndim == 2:
                pass  # Already in expected shape
            elif pixel_values.ndim == 3:
                pixel_values = pixel_values.flatten(0, 1)
            else:
                raise ValueError(
                    f"pixel_values should be 2D or batched 3D tensor. "
                    f"Got ndim: {pixel_values.ndim} "
                    f"(shape={pixel_values.shape})"
                )
        else:
            pixel_values = torch.concat(pixel_values)

        # Normalize vision_grid_thw to 2D tensor (num_images, 3)
        if isinstance(vision_grid_thw, torch.Tensor):
            if vision_grid_thw.ndim == 3:
                vision_grid_thw = vision_grid_thw.flatten(0, 1)
        else:
            vision_grid_thw = torch.concat(vision_grid_thw)

        return KananaVImagePixelInputs(
            type="pixel_values",
            pixel_values=pixel_values,
            vision_grid_thw=vision_grid_thw,
        )

    def _process_image_input(self, image_input: KananaVImageInputs) -> torch.Tensor:
        pixel_values = image_input["pixel_values"]
        vision_grid_thw = image_input["vision_grid_thw"]

        image_metas = {"vision_grid_thw": vision_grid_thw}
        visual_embeds = self.forward_and_project_vision(pixel_values, image_metas)

        merge_size = self.abstractor.merge_size
        batch_size = vision_grid_thw.size(0)
        multi_modal_embeddings: tuple[torch.Tensor, ...] = ()
        sample_index = 0
        for i in range(batch_size):
            t, h, w = (
                vision_grid_thw[i][0],
                vision_grid_thw[i][1] // merge_size,
                vision_grid_thw[i][2] // merge_size,
            )
            num_tokens = t * h * w
            visual_embed = visual_embeds[sample_index : sample_index + num_tokens]
            multi_modal_embeddings += (visual_embed,)
            sample_index += num_tokens

        return multi_modal_embeddings

    def _get_visual_feature_at(
        self,
        v_output: Sequence[torch.Tensor],
        layer_index: int | Sequence[int],
    ) -> torch.Tensor:
        if isinstance(layer_index, (list, tuple)):
            visual_features = torch.stack(v_output, dim=1)[
                :, layer_index
            ]  # [B, n_scales, L, dim]
        else:
            visual_features = v_output[layer_index]  # [B, L, dim]
        return visual_features

    def forward_vision(
        self,
        pixel_values: torch.Tensor,
        image_metas: dict | None = None,
    ) -> torch.Tensor:
        vision_model_args = {
            "pixel_values": pixel_values,
            "return_dict": True,
            "output_hidden_states": True,
            "grid_thw": image_metas["vision_grid_thw"],
        }
        v_outputs = self.vision_model(**vision_model_args)
        layer_index = self.config.projector_config.feature_layer_index
        visual_features = self._get_visual_feature_at(
            v_outputs.hidden_states, layer_index
        )
        return visual_features

    def forward_projector(
        self,
        visual_features: torch.Tensor,
        image_metas: dict | None = None,
    ) -> torch.Tensor:
        visual_embeds = self.abstractor(
            visual_features,
            grid_thw=image_metas["vision_grid_thw"],
        )["last_hidden_state"]
        return visual_embeds

    def forward_and_project_vision(
        self,
        pixel_values: torch.Tensor,
        image_metas: dict | None = None,
    ) -> torch.Tensor:
        assert pixel_values is not None
        visual_features = self.forward_vision(pixel_values, image_metas=image_metas)
        visual_embeds = self.forward_projector(visual_features, image_metas=image_metas)
        return visual_embeds

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

    def embed_multimodal(self, **kwargs: object) -> MultiModalEmbeddings:
        image_input = self._parse_and_validate_image_input(**kwargs)
        if image_input is None:
            return []

        return self._process_image_input(image_input)

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

        hidden_states = self.language_model(
            input_ids=input_ids,
            positions=positions,
            intermediate_tensors=intermediate_tensors,
            inputs_embeds=inputs_embeds,
        )

        return hidden_states

    def compute_logits(self, hidden_states: torch.Tensor) -> torch.Tensor:
        return self.language_model.compute_logits(hidden_states)

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