[Model] Support Pixtral models in the HF Transformers format (#9036)

docs/source/models/supported_models.rst

@@ -437,7 +437,7 @@ Text Generation
   * - :code:`PixtralForConditionalGeneration`
     - Pixtral
     - T + I\ :sup:`+`
-    - :code:`mistralai/Pixtral-12B-2409`
+    - :code:`mistralai/Pixtral-12B-2409`, :code:`mistral-community/pixtral-12b` etc.
     -
     - ✅︎
   * - :code:`QWenLMHeadModel`

examples/offline_inference_vision_language.py

@@ -277,6 +277,22 @@ def run_qwen2_vl(question: str, modality: str):
     return llm, prompt, stop_token_ids
 
 
+# Pixtral HF-format
+def run_pixtral_hf(question: str, modality: str):
+    assert modality == "image"
+
+    model_name = "mistral-community/pixtral-12b"
+
+    llm = LLM(
+        model=model_name,
+        max_model_len=8192,
+    )
+
+    prompt = f"<s>[INST]{question}\n[IMG][/INST]"
+    stop_token_ids = None
+    return llm, prompt, stop_token_ids
+
+
 # LLama 3.2
 def run_mllama(question: str, modality: str):
     assert modality == "image"
@@ -347,6 +363,7 @@ model_example_map = {
     "NVLM_D": run_nvlm_d,
     "qwen_vl": run_qwen_vl,
     "qwen2_vl": run_qwen2_vl,
+    "pixtral_hf": run_pixtral_hf,
     "mllama": run_mllama,
     "molmo": run_molmo,
     "glm4v": run_glm4v,

vllm/model_executor/layers/activation.py

@@ -264,6 +264,8 @@ _ACTIVATION_REGISTRY = LazyDict({
     lambda: nn.ReLU(),
     "relu2":
     lambda: ReLUSquaredActivation(),
+    "silu":
+    lambda: nn.SiLU(),
     "quick_gelu":
     lambda: QuickGELU(),
 })

vllm/model_executor/models/llava.py

@@ -5,7 +5,8 @@ from typing import (Iterable, List, Literal, Mapping, Optional, Tuple,
 import torch
 import torch.nn as nn
 from PIL import Image
-from transformers import CLIPVisionConfig, LlavaConfig, SiglipVisionConfig
+from transformers import (CLIPVisionConfig, LlavaConfig, PixtralVisionConfig,
+                          SiglipVisionConfig)
 
 from vllm.attention import AttentionMetadata
 from vllm.config import CacheConfig, MultiModalConfig
@@ -22,6 +23,10 @@ from .clip import (CLIPVisionModel, dummy_image_for_clip,
                    dummy_seq_data_for_clip, get_max_clip_image_tokens,
                    input_processor_for_clip)
 from .interfaces import SupportsMultiModal, SupportsPP
+from .pixtral import (PixtralHFVisionModel, dummy_image_for_pixtral_hf,
+                      dummy_seq_data_for_pixtral_hf,
+                      get_max_pixtral_hf_image_tokens,
+                      input_processor_for_pixtral_hf)
 from .siglip import (SiglipVisionModel, dummy_image_for_siglip,
                      dummy_seq_data_for_siglip, get_max_siglip_image_tokens,
                      input_processor_for_siglip)
@@ -31,8 +36,13 @@ from .utils import (AutoWeightsLoader, flatten_bn, init_vllm_registered_model,
 
 class LlavaImagePixelInputs(TypedDict):
     type: Literal["pixel_values"]
-    data: torch.Tensor
+    data: Union[torch.Tensor, List[torch.Tensor]]
-    """Shape: `(batch_size * num_images, num_channels, height, width)`"""
+    """
+    Shape: `(batch_size * num_images, num_channels, height, width)`
+
+    Note that `height` or `width` may be different per batch and image,
+    in which case the data is passed as a list instead of a batched tensor.
+    """
 
 
 class LlavaImageEmbeddingInputs(TypedDict):
@@ -77,6 +87,8 @@ def get_max_llava_image_tokens(ctx: InputContext):
         num_image_tokens = get_max_clip_image_tokens(vision_config)
     elif isinstance(vision_config, SiglipVisionConfig):
         num_image_tokens = get_max_siglip_image_tokens(vision_config)
+    elif isinstance(vision_config, PixtralVisionConfig):
+        num_image_tokens = get_max_pixtral_hf_image_tokens(vision_config)
     else:
         msg = f"Unsupported vision config: {type(vision_config)}"
         raise NotImplementedError(msg)
@@ -120,6 +132,17 @@ def dummy_data_for_llava(ctx: InputContext, seq_len: int,
 
         mm_data = dummy_image_for_siglip(vision_config, num_images)
         return seq_data, mm_data
+    elif isinstance(vision_config, PixtralVisionConfig):
+        seq_data = dummy_seq_data_for_pixtral_hf(
+            vision_config,
+            seq_len,
+            num_images,
+            image_token_id=hf_config.image_token_index,
+            image_feature_size_override=image_feature_size,
+        )
+
+        mm_data = dummy_image_for_pixtral_hf(vision_config, num_images)
+        return seq_data, mm_data
 
     msg = f"Unsupported vision config: {type(vision_config)}"
     raise NotImplementedError(msg)
@@ -163,6 +186,15 @@ def input_processor_for_llava(ctx: InputContext, inputs: DecoderOnlyInputs):
             image_token_id=hf_config.image_token_index,
             image_feature_size_override=image_feature_size,
         )
+    elif isinstance(vision_config, PixtralVisionConfig):
+        # We ignore image_feature_size_override since we have non-uniform
+        # image sizes for Pixtral
+        return input_processor_for_pixtral_hf(
+            model_config,
+            vision_config,
+            inputs,
+            image_token_id=hf_config.image_token_index,
+        )
 
     msg = f"Unsupported vision config: {type(vision_config)}"
     raise NotImplementedError(msg)
@@ -189,6 +221,9 @@ def _init_vision_tower(hf_config: LlavaConfig):
             vision_config,
             num_hidden_layers_override=num_hidden_layers,
         )
+    elif isinstance(vision_config, PixtralVisionConfig):
+        # TODO: allow layer override?
+        return PixtralHFVisionModel(vision_config)
 
     msg = f"Unsupported vision config: {type(vision_config)}"
     raise NotImplementedError(msg)
@@ -210,6 +245,15 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
         self.config = config
         self.multimodal_config = multimodal_config
 
+        # NOTE: These are special cases for Pixtral-12B in the HF-format
+        # https://huggingface.co/mistral-community/pixtral-12b/blob/main/config.json  # noqa
+        if (config.text_config.architectures is None
+                and config.text_config.model_type == "mistral"):
+            config.text_config.architectures = ["MistralForCausalLM"]
+        if (config.projector_hidden_act is None
+                and config.vision_config.hidden_act == "gelu"):
+            config.projector_hidden_act = "gelu"
+
         # TODO: Optionally initializes this for supporting embeddings.
         self.vision_tower = _init_vision_tower(config)
         self.multi_modal_projector = LlavaMultiModalProjector(
@@ -246,6 +290,7 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
     def _parse_and_validate_image_input(
             self, **kwargs: object) -> Optional[LlavaImageInputs]:
         pixel_values = kwargs.pop("pixel_values", None)
+        image_sizes = kwargs.pop("image_sizes", None)
         image_embeds = kwargs.pop("image_embeds", None)
 
         if pixel_values is None and image_embeds is None:
@@ -256,6 +301,26 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
                 raise ValueError("Incorrect type of pixel values. "
                                  f"Got type: {type(pixel_values)}")
 
+            # Case for models like PixtralHF that have dynamic image sizes
+            # so we need to produce a list of tensors
+            if image_sizes is not None:
+                images = pixel_values
+                if isinstance(images, torch.Tensor):
+                    # if passed as batch take all images
+                    NN, N, B, C, W, H = images.shape
+                    images = images.reshape(NN * N * B, C, W, H)
+                    images = [images[i] for i in range(images.size(0))]
+                elif isinstance(images, list):
+                    # if passed as list flatten lists of tensors
+                    while isinstance(images, list) and len(images) == 1:
+                        images = images[0]
+
+                # TODO: Add validation based on image_sizes
+                return LlavaImagePixelInputs(
+                    type="pixel_values",
+                    data=images,
+                )
+
             return LlavaImagePixelInputs(
                 type="pixel_values",
                 data=self._validate_pixel_values(
@@ -286,7 +351,8 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
 
     def _image_pixels_to_features(
         self,
-        vision_tower: Union[CLIPVisionModel, SiglipVisionModel],
+        vision_tower: Union[CLIPVisionModel, SiglipVisionModel,
+                            PixtralHFVisionModel],
         pixel_values: torch.Tensor,
     ) -> torch.Tensor:
 

vllm/model_executor/models/pixtral.py

@@ -3,18 +3,26 @@ from functools import cached_property
 from itertools import tee
 from typing import Iterable, List, Mapping, Optional, Tuple, Union
 
+import numpy
 import torch
 import torch.nn as nn
 import torch.nn.functional as F
 from mistral_common.protocol.instruct.messages import ImageChunk
 from PIL import Image
-from transformers import PretrainedConfig
+from transformers import PixtralVisionConfig, PretrainedConfig
+from transformers.models.pixtral.image_processing_pixtral import (
+    _num_image_tokens)
+from transformers.models.pixtral.modeling_pixtral import (
+    PixtralRotaryEmbedding, apply_rotary_pos_emb,
+    generate_block_attention_mask, position_ids_in_meshgrid)
 from xformers.ops.fmha import memory_efficient_attention
 from xformers.ops.fmha.attn_bias import BlockDiagonalMask
 
 from vllm.attention import AttentionMetadata
-from vllm.config import CacheConfig, MultiModalConfig
+from vllm.config import CacheConfig, ModelConfig, MultiModalConfig
-from vllm.inputs import INPUT_REGISTRY, DecoderOnlyInputs, InputContext
+from vllm.inputs import (INPUT_REGISTRY, DecoderOnlyInputs, InputContext,
+                         token_inputs)
+from vllm.model_executor.layers.activation import get_act_fn
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.quantization import QuantizationConfig
 from vllm.model_executor.layers.sampler import Sampler, SamplerOutput
@@ -25,6 +33,8 @@ from vllm.multimodal import MULTIMODAL_REGISTRY
 from vllm.multimodal.base import MultiModalInputs
 from vllm.multimodal.utils import cached_get_tokenizer
 from vllm.sequence import IntermediateTensors, SequenceData
+from vllm.transformers_utils.processor import cached_get_processor
+from vllm.utils import is_list_of
 
 from .interfaces import SupportsMultiModal, SupportsPP
 from .utils import init_vllm_registered_model
@@ -576,3 +586,397 @@ class VisionLanguageAdapter(nn.Module):
 
     def forward(self, x: torch.Tensor) -> torch.Tensor:
         return self.w_out(self.gelu(self.w_in(x)))
+
+
+#### HF Transformers version of Pixtral ####
+# Based off https://github.com/huggingface/transformers/blob/d7950bff82b18c823193d17d72188c5e46d06c83/src/transformers/models/pixtral/modeling_pixtral.py
+# This model follows the Llava family, meaning image embeddings are placed
+# instead of the `[IMG]` token placeholders.
+# The model uses [`PixtralVisionModel`] for its vision encoder,
+# and [`MistralForCausalLM`] for its language decoder.
+
+
+def get_pixtral_hf_patch_grid_length(*, image_size: int,
+                                     patch_size: int) -> int:
+    # Since interpolation is applied, the image size need not be divisible
+    # assert image_size % patch_size == 0
+    return image_size // patch_size
+
+
+def get_pixtral_hf_num_patches(*, image_size: int, patch_size: int) -> int:
+    grid_length = get_pixtral_hf_patch_grid_length(image_size=image_size,
+                                                   patch_size=patch_size)
+    return grid_length * grid_length
+
+
+def get_max_pixtral_hf_image_feature_size(
+        hf_config: PixtralVisionConfig) -> int:
+    return get_pixtral_hf_num_patches(image_size=hf_config.image_size,
+                                      patch_size=hf_config.patch_size)
+
+
+def get_max_pixtral_hf_image_tokens(hf_config: PixtralVisionConfig) -> int:
+    return get_max_pixtral_hf_image_feature_size(hf_config)
+
+
+def dummy_seq_data_for_pixtral_hf(
+    hf_config: PixtralVisionConfig,
+    seq_len: int,
+    num_images: int,
+    *,
+    image_token_id: int,
+    image_feature_size_override: Optional[int] = None,
+):
+    if image_feature_size_override is None:
+        image_feature_size = get_max_pixtral_hf_image_feature_size(hf_config)
+    else:
+        image_feature_size = image_feature_size_override
+
+    return SequenceData.from_prompt_token_counts(
+        (image_token_id, image_feature_size * num_images),
+        (0, seq_len - image_feature_size * num_images),
+    )
+
+
+def dummy_image_for_pixtral_hf(
+    hf_config: PixtralVisionConfig,
+    num_images: int,
+    *,
+    image_width_override: Optional[int] = None,
+    image_height_override: Optional[int] = None,
+):
+    width = height = hf_config.image_size
+    if image_width_override is not None:
+        width = image_width_override
+    if image_height_override is not None:
+        height = image_height_override
+
+    image = Image.new("RGB", (width, height), color=0)
+    return {"image": image if num_images == 1 else [image] * num_images}
+
+
+def get_pixtral_hf_image_feature_size(hf_config: PixtralVisionConfig,
+                                      image_width: int,
+                                      image_height: int) -> Tuple[int, int]:
+    # Adapted from transformers.models.pixtral.image_processing_pixtral.get_resize_output_image_size # noqa: E501
+    # https://github.com/huggingface/transformers/blob/2bd4d5897dc73e8b172832070a6f9e567a0df017/src/transformers/models/pixtral/image_processing_pixtral.py#L180 # noqa: E501
+    max_width, max_height = hf_config.image_size, hf_config.image_size
+    patch_width, patch_height = hf_config.patch_size, hf_config.patch_size
+
+    ratio = max(image_width / max_width, image_height / max_height)
+
+    if ratio > 1:
+        image_width = int(numpy.ceil(image_width / ratio))
+        image_height = int(numpy.ceil(image_height / ratio))
+
+    num_height_tokens, num_width_tokens = _num_image_tokens(
+        (image_height, image_width), (patch_height, patch_width))
+
+    return num_width_tokens, num_height_tokens
+
+
+def input_processor_for_pixtral_hf(
+    model_config: ModelConfig,
+    hf_config: PixtralVisionConfig,
+    inputs: DecoderOnlyInputs,
+    *,
+    image_token_id: int,
+    image_feature_size_override: Optional[Union[int, List[int]]] = None,
+) -> DecoderOnlyInputs:
+    assert image_feature_size_override is None, (
+        "image_feature_size_override is not supported for Pixtral")
+
+    multi_modal_data = inputs.get("multi_modal_data")
+    if multi_modal_data is None or "image" not in multi_modal_data:
+        return inputs
+
+    processor = cached_get_processor(model_config.model)
+
+    image_data = multi_modal_data["image"]
+    if isinstance(image_data, Image.Image):
+        image_data = [image_data]
+    elif not is_list_of(image_data, Image.Image):
+        raise TypeError(f"Invalid image type: {type(image_data)}")
+
+    new_prompt = inputs.get("prompt")
+    new_token_ids = inputs["prompt_token_ids"]
+
+    # Update new_prompt if present
+    if new_prompt:
+        replace_strings = []
+        for image in image_data:
+            w, h = image.size
+
+            (num_width_tokens,
+             num_height_tokens) = get_pixtral_hf_image_feature_size(
+                 hf_config, image_width=w, image_height=h)
+
+            replace_tokens = [[processor.image_token] * num_width_tokens +
+                              [processor.image_break_token]
+                              ] * num_height_tokens
+            # Flatten list
+            replace_tokens = [
+                item for sublist in replace_tokens for item in sublist
+            ]
+            replace_tokens[-1] = processor.image_end_token
+            replace_str = "".join(replace_tokens)
+            replace_strings.append(replace_str)
+            new_prompt = new_prompt.replace(processor.image_token,
+                                            "<placeholder>", 1)
+
+        while "<placeholder>" in new_prompt:
+            replace_str = replace_strings.pop(0)
+            new_prompt = new_prompt.replace("<placeholder>", replace_str, 1)
+
+    # Update new_token_ids
+    image_token_id = 10
+    image_break_id = 12
+    image_end_id = 13
+    placeholder_token_id = -999
+    replace_tokens_list = []
+    for image in image_data:
+        w, h = image.size
+
+        num_width_tokens, num_height_tokens = get_pixtral_hf_image_feature_size(
+            hf_config, image_width=w, image_height=h)
+
+        replace_tokens = [[image_token_id] * num_width_tokens +
+                          [image_break_id]] * num_height_tokens
+        # Flatten list
+        replace_tokens = [
+            item for sublist in replace_tokens for item in sublist
+        ]
+        replace_tokens[-1] = image_end_id
+        replace_tokens_list.append(replace_tokens)
+        # Replace image id with placeholder id
+        next_image_index = new_token_ids.index(image_token_id)
+        new_token_ids[next_image_index] = placeholder_token_id
+
+    while placeholder_token_id in new_token_ids:
+        replace_tokens = replace_tokens_list.pop(0)
+        next_image_index = new_token_ids.index(placeholder_token_id)
+        prefix = new_token_ids[:next_image_index]
+        postfix = new_token_ids[next_image_index + 1:]
+        new_token_ids = prefix + replace_tokens + postfix
+
+    # NOTE: Create a defensive copy of the original inputs
+    return token_inputs(prompt_token_ids=new_token_ids,
+                        prompt=new_prompt,
+                        multi_modal_data=multi_modal_data)
+
+
+class PixtralHFMLP(nn.Module):
+
+    def __init__(self, config: PixtralVisionConfig):
+        super().__init__()
+        assert config.intermediate_size is not None
+        self.gate_proj = nn.Linear(config.hidden_size,
+                                   config.intermediate_size,
+                                   bias=False)
+        self.up_proj = nn.Linear(config.hidden_size,
+                                 config.intermediate_size,
+                                 bias=False)
+        self.down_proj = nn.Linear(config.intermediate_size,
+                                   config.hidden_size,
+                                   bias=False)
+        self.act = get_act_fn(config.hidden_act)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        return self.down_proj(self.act(self.gate_proj(x)) * self.up_proj(x))
+
+
+class PixtralHFAttention(nn.Module):
+
+    def __init__(self, config: PixtralVisionConfig):
+        super().__init__()
+        self.config = config
+        assert not config.hidden_size % config.num_attention_heads
+        self.n_heads = config.num_attention_heads
+        self.head_dim = config.hidden_size // config.num_attention_heads
+
+        self.scale = self.head_dim**-0.5
+
+        self.q_proj = nn.Linear(config.hidden_size,
+                                config.hidden_size,
+                                bias=False)
+        self.k_proj = nn.Linear(config.hidden_size,
+                                config.hidden_size,
+                                bias=False)
+        self.v_proj = nn.Linear(config.hidden_size,
+                                config.hidden_size,
+                                bias=False)
+        self.o_proj = nn.Linear(config.hidden_size,
+                                config.hidden_size,
+                                bias=False)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: torch.Tensor,
+        position_embeddings: torch.Tensor,
+    ) -> Tuple[torch.Tensor, Optional[torch.Tensor]]:
+        """Input shape: Batch x Time x Channel"""
+
+        batch_size, patches, _ = hidden_states.size()
+
+        query_states = self.q_proj(hidden_states)
+        key_states = self.k_proj(hidden_states)
+        value_states = self.v_proj(hidden_states)
+
+        query_states = query_states.view(batch_size, patches, self.n_heads,
+                                         self.head_dim).transpose(1, 2)
+        key_states = key_states.view(batch_size, patches, self.n_heads,
+                                     self.head_dim).transpose(1, 2)
+        value_states = value_states.view(batch_size, patches, self.n_heads,
+                                         self.head_dim).transpose(1, 2)
+
+        cos, sin = position_embeddings
+        query_states, key_states = apply_rotary_pos_emb(query_states,
+                                                        key_states,
+                                                        cos,
+                                                        sin,
+                                                        unsqueeze_dim=0)
+
+        attn_weights = torch.matmul(query_states, key_states.transpose(
+            2, 3)) * self.scale
+
+        if attention_mask is not None:
+            attn_weights = attn_weights + attention_mask
+
+        # upcast attention to fp32
+        attn_weights = nn.functional.softmax(attn_weights,
+                                             dim=-1,
+                                             dtype=torch.float32).to(
+                                                 query_states.dtype)
+        attn_output = torch.matmul(attn_weights, value_states)
+
+        attn_output = attn_output.transpose(1, 2).contiguous()
+        attn_output = attn_output.reshape(batch_size, patches, -1)
+
+        return self.o_proj(attn_output)
+
+
+class PixtralHFTransformerBlock(nn.Module):
+
+    def __init__(self, config: PixtralVisionConfig):
+        super().__init__()
+        self.attention_norm = RMSNorm(config.hidden_size, eps=1e-5)
+        self.attention = PixtralHFAttention(config)
+        self.feed_forward = PixtralHFMLP(config)
+        self.ffn_norm = RMSNorm(config.hidden_size, eps=1e-5)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        attention_mask: torch.Tensor,
+        position_embeddings: torch.Tensor,
+    ) -> torch.Tensor:
+        r = self.attention.forward(self.attention_norm(hidden_states),
+                                   attention_mask=attention_mask,
+                                   position_embeddings=position_embeddings)
+        h = hidden_states + r
+        r = self.feed_forward.forward(self.ffn_norm(h))
+        out = h + r
+        return out
+
+
+class PixtralHFTransformer(nn.Module):
+
+    def __init__(self, config: PixtralVisionConfig):
+        super().__init__()
+        self.layers = torch.nn.ModuleList()
+        for _ in range(config.num_hidden_layers):
+            self.layers.append(PixtralHFTransformerBlock(config))
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        attention_mask: torch.Tensor,
+        position_embeddings: torch.Tensor,
+    ) -> torch.Tensor:
+        for layer in self.layers:
+            x = layer(x, attention_mask, position_embeddings)
+        return x
+
+
+class PixtralHFVisionModel(nn.Module):
+
+    def __init__(self, config: PixtralVisionConfig):
+        super().__init__()
+
+        self.config = config
+        self.patch_conv = nn.Conv2d(
+            in_channels=config.num_channels,
+            out_channels=config.hidden_size,
+            kernel_size=config.patch_size,
+            stride=config.patch_size,
+            bias=False,
+        )
+        self.ln_pre = RMSNorm(config.hidden_size, eps=1e-5)
+        self.transformer = PixtralHFTransformer(config)
+        self.dtype = next(self.parameters()).dtype
+        self.device = next(self.parameters()).device
+        self.patch_positional_embedding = PixtralRotaryEmbedding(
+            config, self.device)
+
+    def forward(
+        self,
+        pixel_values: List[torch.Tensor],
+    ) -> torch.Tensor:
+        """
+        Args:
+            pixel_values: tensor of token features for
+                all tokens of all images of shape (N_toks, D)
+        Returns:
+            image_features: tensor of token features for
+                all tokens of all images of shape (N_toks, D)
+        """
+        # pass images through initial convolution independently
+        patch_embeds_list = [
+            self.patch_conv(
+                img.reshape(-1, img.shape[-3], img.shape[-2],
+                            img.shape[-1]).to(self.dtype))
+            for img in pixel_values
+        ]
+
+        # flatten to a single sequence
+        patch_embeds = torch.cat(
+            [p.flatten(2).permute(0, 2, 1) for p in patch_embeds_list], dim=1)
+        patch_embeds = self.ln_pre(patch_embeds)
+
+        # positional embeddings
+        position_ids = position_ids_in_meshgrid(
+            patch_embeds_list,
+            max_width=self.config.image_size // self.config.patch_size).to(
+                self.device)
+
+        position_embedding = self.patch_positional_embedding(
+            patch_embeds, position_ids)
+        attention_mask = generate_block_attention_mask(
+            [p.shape[-2] * p.shape[-1] for p in patch_embeds_list],
+            patch_embeds)
+        out = self.transformer(patch_embeds, attention_mask,
+                               position_embedding)
+
+        return out
+
+    # (TODO) Add prefix argument for filtering out weights to be loaded
+    #        ref: https://github.com/vllm-project/vllm/pull/7186#discussion_r1734163986
+    def load_weights(self, weights: Iterable[Tuple[str, torch.Tensor]]):
+        stacked_params_mapping = []
+        params_dict = dict(self.named_parameters())
+
+        for name, loaded_weight in weights:
+            for (param_name, weight_name, shard_id) in stacked_params_mapping:
+                if weight_name not in name:
+                    continue
+
+                param = params_dict[name.replace(weight_name, param_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)

vllm/model_executor/models/qwen2_vl.py

@@ -22,7 +22,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Inference-only Qwen2-VL model compatible with HuggingFace weights."""
-from functools import lru_cache, partial
+from functools import partial
 from typing import (Any, Callable, Iterable, List, Literal, Mapping, Optional,
                     Tuple, Type, TypedDict, Union)
 
@@ -63,7 +63,7 @@ from vllm.multimodal.base import MultiModalData
 from vllm.multimodal.image import cached_get_image_processor
 from vllm.sequence import IntermediateTensors, SequenceData
 from vllm.transformers_utils.config import uses_mrope
-from vllm.transformers_utils.processor import get_processor
+from vllm.transformers_utils.processor import cached_get_processor
 
 from .interfaces import SupportsMultiModal, SupportsPP
 from .utils import (PPMissingLayer, get_vit_attn_backend,
@@ -544,8 +544,6 @@ class Qwen2VisionTransformer(nn.Module):
 
 # === Vision input helpers === #
 
-cached_get_processor = lru_cache(get_processor)
-
 
 def mm_input_mapper_for_qwen2_vl(
     ctx: InputContext,

vllm/transformers_utils/processor.py

@@ -1,3 +1,4 @@
+from functools import lru_cache
 from typing import Any, cast
 
 
@@ -37,6 +38,9 @@ def get_processor(
     return cast(ProcessorMixin, processor)
 
 
+cached_get_processor = lru_cache(get_processor)
+
+
 def get_image_processor(
     processor_name: str,
     *args: Any,