[Model] Support Dots OCR (#24645)

Signed-off-by: Roger Wang <hey@rogerw.io>
Co-authored-by: yinz-aizip <yinz@aizip.ai>

docs/models/supported_models.md

@@ -352,6 +352,7 @@ th {
 | `DeepseekV2ForCausalLM` | DeepSeek-V2 | `deepseek-ai/DeepSeek-V2`, `deepseek-ai/DeepSeek-V2-Chat`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `DeepseekV3ForCausalLM` | DeepSeek-V3 | `deepseek-ai/DeepSeek-V3`, `deepseek-ai/DeepSeek-R1`, `deepseek-ai/DeepSeek-V3.1`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `Dots1ForCausalLM` | dots.llm1 | `rednote-hilab/dots.llm1.base`, `rednote-hilab/dots.llm1.inst`, etc. | | ✅︎ | ✅︎ |
+| `DotsOCRForCausalLM` | dots_ocr | `rednote-hilab/dots.ocr` | | ✅︎ | ✅︎ |
 | `Ernie4_5ForCausalLM` | Ernie4.5 | `baidu/ERNIE-4.5-0.3B-PT`, etc. | ✅︎ | ✅︎ | ✅︎ |
 | `Ernie4_5_MoeForCausalLM` | Ernie4.5MoE | `baidu/ERNIE-4.5-21B-A3B-PT`, `baidu/ERNIE-4.5-300B-A47B-PT`, etc. |✅︎| ✅︎ | ✅︎ |
 | `ExaoneForCausalLM` | EXAONE-3 | `LGAI-EXAONE/EXAONE-3.0-7.8B-Instruct`, etc. | ✅︎ | ✅︎ | ✅︎ |

examples/offline_inference/vision_language.py

@@ -126,6 +126,23 @@ def run_chameleon(questions: list[str], modality: str) -> ModelRequestData:
     )
 
 
+# Dots-OCR
+def run_dots_ocr(questions: list[str], modality: str) -> ModelRequestData:
+    assert modality == "image"
+
+    prompts = [f"<|img|><|imgpad|><|endofimg|>{question}" for question in questions]
+    engine_args = EngineArgs(
+        model="rednote-hilab/dots.ocr",
+        limit_mm_per_prompt={modality: 1},
+        trust_remote_code=True,
+    )
+
+    return ModelRequestData(
+        engine_args=engine_args,
+        prompts=prompts,
+    )
+
+
 def run_command_a_vision(questions: list[str], modality: str) -> ModelRequestData:
     assert modality == "image"
 
@@ -1676,6 +1693,7 @@ model_example_map = {
     "aya_vision": run_aya_vision,
     "blip-2": run_blip2,
     "chameleon": run_chameleon,
+    "dots_ocr": run_dots_ocr,
     "command_a_vision": run_command_a_vision,
     "deepseek_vl_v2": run_deepseek_vl2,
     "ernie45_vl": run_ernie45_vl,

tests/models/registry.py

@@ -448,6 +448,8 @@ _MULTIMODAL_EXAMPLE_MODELS = {
                                                 max_transformers_version="4.48",  # noqa: E501
                                                 transformers_version_reason="HF model is not compatible.",  # noqa: E501
                                                 hf_overrides={"architectures": ["DeepseekVLV2ForCausalLM"]}),  # noqa: E501
+    "DotsOCRForCausalLM": _HfExamplesInfo("rednote-hilab/dots.ocr",
+                                          trust_remote_code=True),
     "Emu3ForConditionalGeneration": _HfExamplesInfo("BAAI/Emu3-Chat-hf"),
     "Ernie4_5_VLMoeForConditionalGeneration": _HfExamplesInfo("baidu/ERNIE-4.5-VL-28B-A3B-PT",  # noqa: E501
                                                               trust_remote_code=True),

vllm/model_executor/models/dots_ocr.py

@@ -0,0 +1,824 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from collections.abc import Iterable, Mapping
+from typing import Literal, Optional, TypedDict, Union
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from torch.nn import LayerNorm
+from transformers.modeling_utils import PreTrainedModel
+from transformers.models.qwen2_vl import Qwen2VLProcessor
+
+from vllm.attention.layer import check_upstream_fa_availability
+from vllm.config import VllmConfig
+from vllm.model_executor.layers.activation import SiluAndMul
+from vllm.model_executor.layers.layernorm import RMSNorm
+from vllm.model_executor.layers.linear import (ColumnParallelLinear,
+                                               MergedColumnParallelLinear,
+                                               QKVParallelLinear,
+                                               RowParallelLinear)
+from vllm.model_executor.layers.quantization import QuantizationConfig
+from vllm.model_executor.models.interfaces import (MultiModalEmbeddings,
+                                                   SupportsMultiModal,
+                                                   SupportsPP)
+from vllm.model_executor.models.qwen2 import Qwen2ForCausalLM
+from vllm.model_executor.models.qwen2_vl import (Qwen2VLDummyInputsBuilder,
+                                                 Qwen2VLMultiModalProcessor,
+                                                 Qwen2VLProcessingInfo)
+from vllm.model_executor.models.utils import (AutoWeightsLoader, WeightsMapper,
+                                              init_vllm_registered_model,
+                                              maybe_prefix,
+                                              merge_multimodal_embeddings)
+from vllm.model_executor.models.vision import get_vit_attn_backend
+from vllm.multimodal import MULTIMODAL_REGISTRY
+from vllm.multimodal.inputs import MultiModalDataDict
+from vllm.platforms import _Backend
+from vllm.sequence import IntermediateTensors
+from vllm.transformers_utils.configs.dotsocr import (DotsOCRConfig,
+                                                     DotsVisionConfig)
+
+IMAGE_TOKEN = "<|imgpad|>"
+
+
+class DotsOCRImagePixelInputs(TypedDict):
+    type: Literal["pixel_values", "image_grid_thw"]
+
+    pixel_values: torch.Tensor
+    image_grid_thw: torch.Tensor
+
+
+class DotsOCRImageEmbeddingInputs(TypedDict):
+    type: Literal["image_embeds", "image_grid_thw"]
+    image_embeds: torch.Tensor
+    """Supported types:
+    - List[`torch.Tensor`]: A list of tensors holding all images' features.
+        Each tensor holds an image's features.
+    - `torch.Tensor`: A tensor holding all images' features
+        (concatenation of all images' feature tensors).
+    Tensor shape: `(num_image_features, hidden_size)`
+    - `num_image_features` varies based on
+        the number and resolution of the images.
+    - `hidden_size` must match the hidden size of language model backbone.
+    """
+
+    image_grid_thw: torch.Tensor
+
+
+DotsOCRImageInputs = Union[DotsOCRImagePixelInputs,
+                           DotsOCRImageEmbeddingInputs]
+
+
+class DotsOCRDummyInputsBuilder(Qwen2VLDummyInputsBuilder):
+
+    def get_dummy_text(self, mm_counts: Mapping[str, int]) -> str:
+        num_images = mm_counts.get("image", 0)
+        return IMAGE_TOKEN * num_images
+
+    def get_dummy_mm_data(
+        self,
+        seq_len: int,
+        mm_counts: Mapping[str, int],
+    ) -> MultiModalDataDict:
+        num_images = mm_counts.get("image", 0)
+
+        target_width, target_height = self.info.get_image_size_with_most_features(  # noqa: E501
+        )
+
+        return {
+            "image":
+            self._get_dummy_images(width=target_width,
+                                   height=target_height,
+                                   num_images=num_images),
+        }
+
+
+class DotsOCRProcessingInfo(Qwen2VLProcessingInfo):
+
+    def get_hf_config(self) -> DotsOCRConfig:
+        config = self.ctx.get_hf_config()
+        if not config.__class__.__name__ == 'DotsOCRConfig':
+            raise TypeError(f"Expected DotsOCRConfig, got {type(config)}")
+
+        if hasattr(config, "vision_config") and isinstance(
+                config.vision_config, dict):
+            config.vision_config = DotsVisionConfig(**config.vision_config)
+
+        return config
+
+    def get_supported_mm_limits(self) -> Mapping[str, Optional[int]]:
+        return {"image": None}
+
+    def get_mm_max_tokens_per_item(
+        self,
+        seq_len: int,
+        mm_counts: Mapping[str, int],
+    ) -> Mapping[str, int]:
+        max_image_tokens = self.get_max_image_tokens()
+        return {"image": max_image_tokens}
+
+    def get_hf_processor(
+        self,
+        **kwargs: object,
+    ) -> Qwen2VLProcessor:
+        self.get_tokenizer(
+        ).image_token = IMAGE_TOKEN  # Ensure image token is set
+        processor = self.ctx.get_hf_processor(
+            Qwen2VLProcessor,
+            **kwargs,
+        )
+        processor.image_token = IMAGE_TOKEN
+        processor.video_token = "<|video_pad|>"
+        return processor
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., :x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2:]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb_vision(tensor: torch.Tensor,
+                                freqs: torch.Tensor) -> torch.Tensor:
+    orig_dtype = tensor.dtype
+    tensor = tensor.float()
+
+    cos = freqs.cos()
+    sin = freqs.sin()
+
+    cos = cos.unsqueeze(1).repeat(1, 1, 2).unsqueeze(0).float()
+    sin = sin.unsqueeze(1).repeat(1, 1, 2).unsqueeze(0).float()
+
+    output = (tensor * cos) + (rotate_half(tensor) * sin)
+
+    output = output.to(orig_dtype)
+
+    return output
+
+
+class VisionRotaryEmbedding(nn.Module):
+
+    def __init__(self, dim: int, theta: float = 10000.0) -> None:
+        super().__init__()
+        inv_freq = 1.0 / (theta
+                          **(torch.arange(0, dim, 2, dtype=torch.float) / dim))
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+
+    def forward(self, seqlen: int) -> torch.Tensor:
+        seq = torch.arange(seqlen,
+                           device=self.inv_freq.device,
+                           dtype=self.inv_freq.dtype)
+        freqs = torch.outer(seq, self.inv_freq)
+        return freqs
+
+
+class PatchMerger(nn.Module):
+
+    def __init__(
+        self,
+        dim: int,
+        context_dim: int,
+        spatial_merge_size: int = 2,
+        pre_norm="layernorm",
+    ) -> None:
+        super().__init__()
+        self.hidden_size = context_dim * (spatial_merge_size**2)
+        self.pre_norm = pre_norm
+        if self.pre_norm == "layernorm":
+            self.ln_q = LayerNorm(context_dim, eps=1e-6)
+        elif self.pre_norm == "rmsnorm":
+            self.ln_q = RMSNorm(context_dim, eps=1e-6)
+        else:
+            print("no norm in patch merger")
+
+        self.mlp = nn.Sequential(
+            ColumnParallelLinear(self.hidden_size,
+                                 self.hidden_size,
+                                 bias=True,
+                                 return_bias=False,
+                                 disable_tp=True),
+            nn.GELU(),
+            RowParallelLinear(self.hidden_size,
+                              dim,
+                              bias=True,
+                              return_bias=False,
+                              disable_tp=True),
+        )
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        if self.pre_norm:
+            x = self.mlp(self.ln_q(x).view(-1, self.hidden_size))
+        else:
+            x = self.mlp(x.view(-1, self.hidden_size))
+        return x
+
+
+class DotsVisionAttention(nn.Module):
+
+    def __init__(self,
+                 config,
+                 dim: int,
+                 num_heads: int = 16,
+                 bias: bool = True,
+                 *,
+                 quant_config: Optional[QuantizationConfig] = None,
+                 prefix: str = "") -> None:
+        super().__init__()
+        from vllm.distributed import (parallel_state,
+                                      tensor_model_parallel_all_gather)
+        from vllm.distributed import utils as dist_utils
+
+        self.embed_dim = dim
+        self.num_heads = num_heads
+        self.head_dim = dim // num_heads
+        self.tp_size = parallel_state.get_tensor_model_parallel_world_size()
+        self.tp_rank = parallel_state.get_tensor_model_parallel_rank()
+        self.num_heads_per_partition = dist_utils.divide(
+            num_heads, self.tp_size)
+
+        # qkv/proj follow Qwen2-VL style; bias controlled by arg
+        self.qkv = QKVParallelLinear(hidden_size=dim,
+                                     head_size=dim // num_heads,
+                                     total_num_heads=num_heads,
+                                     bias=bias,
+                                     quant_config=quant_config,
+                                     prefix=f"{prefix}.qkv")
+        self.proj = RowParallelLinear(input_size=dim,
+                                      output_size=dim,
+                                      bias=bias,
+                                      quant_config=quant_config,
+                                      prefix=f"{prefix}.proj")
+        self._all_gather = tensor_model_parallel_all_gather
+        self._split_last = dist_utils.split_tensor_along_last_dim
+
+        # Select attention backend
+        self.attn_backend = get_vit_attn_backend(self.head_dim,
+                                                 torch.get_default_dtype())
+        self.use_upstream_fa = False
+        if self.attn_backend != _Backend.FLASH_ATTN and \
+                check_upstream_fa_availability(torch.get_default_dtype()):
+            self.attn_backend = _Backend.FLASH_ATTN
+            self.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"Unsupported vision attention backend: {self.attn_backend}")
+        self.is_flash_attn_backend = self.attn_backend in {
+            _Backend.FLASH_ATTN, _Backend.ROCM_AITER_FA
+        }
+
+    def _split_qkv(self, qkv: torch.Tensor) -> tuple[torch.Tensor, ...]:
+        # qkv: [S, B, 3*dim]
+        seq_len, bs, _ = qkv.shape
+        if self.tp_size > 1:
+            qkv = self._all_gather(qkv)
+        q, k, v = qkv.chunk(3, dim=2)
+        if self.tp_size > 1:
+            q = self._split_last(q, num_partitions=self.tp_size)[self.tp_rank]
+            k = self._split_last(k, num_partitions=self.tp_size)[self.tp_rank]
+            v = self._split_last(v, num_partitions=self.tp_size)[self.tp_rank]
+        new_shape = (seq_len, bs, self.num_heads_per_partition, self.head_dim)
+        return (q.view(*new_shape), k.view(*new_shape), v.view(*new_shape))
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        cu_seqlens: torch.Tensor,
+        rotary_pos_emb: Optional[torch.Tensor] = None,
+        *,
+        max_seqlen: Optional[int] = None,
+        seqlens: Optional[list[int]] = None,
+    ) -> torch.Tensor:
+        # [S, C] -> [S, B=1, C]
+        x = hidden_states.unsqueeze(1)
+        x, _ = self.qkv(x)
+        q, k, v = self._split_qkv(x)
+        bs = q.shape[1]
+        # [S,B,H,D] -> [B,S,H,D]
+        q = q.permute(1, 0, 2, 3).contiguous()
+        k = k.permute(1, 0, 2, 3).contiguous()
+        v = v.permute(1, 0, 2, 3).contiguous()
+
+        if rotary_pos_emb is not None:
+            qk_concat = torch.cat([q, k], dim=0)
+            qk_rotated = apply_rotary_pos_emb_vision(qk_concat, rotary_pos_emb)
+            q, k = torch.chunk(qk_rotated, 2, dim=0)
+
+        if self.is_flash_attn_backend:
+            if self.attn_backend == _Backend.ROCM_AITER_FA:
+                from aiter import flash_attn_varlen_func
+            else:
+                if self.use_upstream_fa:
+                    from flash_attn import flash_attn_varlen_func
+                else:
+                    from vllm.vllm_flash_attn import flash_attn_varlen_func
+            q_ = q.reshape(bs * q.shape[1], q.shape[2], q.shape[3])
+            k_ = k.reshape(bs * k.shape[1], k.shape[2], k.shape[3])
+            v_ = v.reshape(bs * v.shape[1], v.shape[2], v.shape[3])
+            output = flash_attn_varlen_func(q_,
+                                            k_,
+                                            v_,
+                                            cu_seqlens_q=cu_seqlens,
+                                            cu_seqlens_k=cu_seqlens,
+                                            max_seqlen_q=max_seqlen,
+                                            max_seqlen_k=max_seqlen,
+                                            dropout_p=0.0,
+                                            causal=False)
+            context_layer = output.view(bs, -1, self.num_heads_per_partition,
+                                        self.head_dim)
+        elif self.attn_backend == _Backend.TORCH_SDPA:
+            outputs = []
+            for i in range(1, len(cu_seqlens)):
+                s = int(cu_seqlens[i - 1])
+                e = int(cu_seqlens[i])
+                q_i = q[:, s:e].permute(0, 2, 1, 3)
+                k_i = k[:, s:e].permute(0, 2, 1, 3)
+                v_i = v[:, s:e].permute(0, 2, 1, 3)
+                out_i = F.scaled_dot_product_attention(q_i,
+                                                       k_i,
+                                                       v_i,
+                                                       dropout_p=0.0)
+                out_i = out_i.permute(0, 2, 1, 3)
+                outputs.append(out_i)
+            context_layer = torch.cat(outputs, dim=1) if outputs else q[:, :0]
+        elif self.attn_backend == _Backend.XFORMERS:
+            from xformers import ops as xops
+            from xformers.ops.fmha.attn_bias import BlockDiagonalMask
+            attn_bias = BlockDiagonalMask.from_seqlens(q_seqlen=seqlens,
+                                                       kv_seqlen=None,
+                                                       device=q.device)
+            context_layer = xops.memory_efficient_attention_forward(
+                q, k, v, attn_bias=attn_bias, p=0, scale=None)
+        else:
+            raise RuntimeError("Unsupported attention backend")
+
+        # [B,S,H,D] -> [S,B,H*D] -> [S, C]
+        context_layer = context_layer.permute(1, 0, 2, 3).contiguous()
+        context_layer = context_layer.view(context_layer.shape[0], bs, -1)
+        out, _ = self.proj(context_layer)
+        return out.squeeze(1)
+
+
+class DotsSwiGLUFFN(nn.Module):
+
+    def __init__(self,
+                 config,
+                 *,
+                 quant_config: Optional[QuantizationConfig] = None,
+                 prefix: str = ""):
+        super().__init__()
+        hidden_features = config.intermediate_size
+        in_features = config.embed_dim
+        bias = config.use_bias
+
+        # Referenced aimv2.py AIMv2SwiGLUFFN
+        self.fc13 = MergedColumnParallelLinear(in_features,
+                                               [hidden_features] * 2,
+                                               bias=bias,
+                                               quant_config=quant_config,
+                                               prefix=f"{prefix}.fc13",
+                                               disable_tp=True)
+        self.fc2 = RowParallelLinear(hidden_features,
+                                     in_features,
+                                     bias=bias,
+                                     quant_config=quant_config,
+                                     prefix=f"{prefix}.fc2",
+                                     disable_tp=True)
+        self.act_fn = SiluAndMul()
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x, _ = self.fc13(x)
+        x = self.act_fn(x)
+        x, _ = self.fc2(x)
+        return x
+
+    def load_weights(self, weights: Iterable[tuple[str,
+                                                   torch.Tensor]]) -> set[str]:
+        params = dict(self.named_parameters())
+        loaded: set[str] = set()
+        for name, w in weights:
+            # Map fc1 -> fc13 (shard 0)
+            if name.startswith("fc1."):
+                tgt = name.replace("fc1.", "fc13.")
+                if tgt in params:
+                    params[tgt].weight_loader(params[tgt], w, 0)
+                    loaded.add(tgt)
+                continue
+            # Map fc3 -> fc13 (shard 1)
+            if name.startswith("fc3."):
+                tgt = name.replace("fc3.", "fc13.")
+                if tgt in params:
+                    params[tgt].weight_loader(params[tgt], w, 1)
+                    loaded.add(tgt)
+                continue
+            # Pass-through for fc2 and others
+            if name in params:
+                params[name].weight_loader(params[name], w)
+                loaded.add(name)
+        return loaded
+
+
+class DotsPatchEmbed(nn.Module):
+
+    def __init__(self, config):
+        super().__init__()
+        self.num_channels = config.num_channels
+        self.patch_size = config.patch_size
+        self.temporal_patch_size = config.temporal_patch_size
+        self.embed_dim = config.embed_dim
+        self.config = config
+        self.proj = nn.Conv2d(
+            config.num_channels,
+            config.embed_dim,
+            kernel_size=(config.patch_size, config.patch_size),
+            stride=(config.patch_size, config.patch_size),
+        )
+        self.norm = RMSNorm(config.embed_dim, eps=config.rms_norm_eps)
+
+    def forward(self, x: torch.Tensor, grid_thw=None) -> torch.Tensor:
+        x = x.view(-1, self.num_channels, self.temporal_patch_size,
+                   self.patch_size, self.patch_size)[:, :, 0]
+        x = self.proj(x).view(-1, self.embed_dim)
+        x = self.norm(x)
+        return x
+
+
+class DotsViTPreprocessor(nn.Module):
+
+    def __init__(self, config):
+        super().__init__()
+        self.patch_h = config.patch_size
+        self.patch_w = config.patch_size
+        self.embed_dim = config.embed_dim
+        self.config = config
+        self.patchifier = DotsPatchEmbed(config)
+
+    def forward(self, x: torch.Tensor, grid_thw=None) -> torch.Tensor:
+        tokens = self.patchifier(x, grid_thw)
+        return tokens
+
+
+class DotsVisionBlock(nn.Module):
+
+    def __init__(self,
+                 config,
+                 *,
+                 quant_config: Optional[QuantizationConfig] = None,
+                 prefix: str = ""):
+        super().__init__()
+
+        self.attn = DotsVisionAttention(
+            config,
+            config.embed_dim,
+            num_heads=config.num_attention_heads,
+            bias=config.use_bias,
+            quant_config=quant_config,
+            prefix=f"{prefix}.attn",
+        )
+        self.norm1 = RMSNorm(config.embed_dim, eps=config.rms_norm_eps)
+        self.mlp = DotsSwiGLUFFN(config,
+                                 quant_config=quant_config,
+                                 prefix=f"{prefix}.mlp")
+        self.norm2 = RMSNorm(config.embed_dim, eps=config.rms_norm_eps)
+
+    def forward(self,
+                hidden_states: torch.Tensor,
+                *,
+                cu_seqlens: torch.Tensor,
+                rotary_pos_emb: torch.Tensor,
+                max_seqlen: Optional[int] = None,
+                seqlens: Optional[list[int]] = None) -> torch.Tensor:
+        hidden_states = hidden_states + self.attn(
+            self.norm1(hidden_states),
+            cu_seqlens=cu_seqlens,
+            rotary_pos_emb=rotary_pos_emb,
+            max_seqlen=max_seqlen,
+            seqlens=seqlens,
+        )
+        hidden_states = hidden_states + self.mlp(self.norm2(hidden_states))
+        return hidden_states
+
+
+class DotsVisionTransformer(PreTrainedModel):
+
+    def __init__(
+        self,
+        config: DotsVisionConfig,
+        quant_config: Optional[QuantizationConfig] = None,
+        *,
+        num_hidden_layers_override: Optional[int] = None,
+        require_post_norm: Optional[bool] = None,
+        prefix: str = "",
+    ) -> None:
+        super().__init__(config)
+        self.config = config
+        self.spatial_merge_size = config.spatial_merge_size
+
+        self.patch_embed = DotsViTPreprocessor(config)
+
+        head_dim = config.embed_dim // config.num_attention_heads
+        self.rotary_pos_emb = VisionRotaryEmbedding(head_dim // 2)
+        self.attn_backend = get_vit_attn_backend(
+            head_size=head_dim, dtype=torch.get_default_dtype())
+        if self.attn_backend != _Backend.FLASH_ATTN and \
+                check_upstream_fa_availability(torch.get_default_dtype()):
+            self.attn_backend = _Backend.FLASH_ATTN
+
+        # Keep blocks for compatibility with other vision towers
+        num_layers = (config.num_hidden_layers if num_hidden_layers_override
+                      is None else num_hidden_layers_override)
+        self.blocks = nn.ModuleList([
+            DotsVisionBlock(config,
+                            quant_config=quant_config,
+                            prefix=f"{prefix}.blocks.{i}")
+            for i in range(num_layers)
+        ])
+        if require_post_norm is None:
+            require_post_norm = (len(self.blocks) == config.num_hidden_layers)
+        if require_post_norm and self.config.post_norm:
+            self.post_trunk_norm = RMSNorm(config.embed_dim,
+                                           eps=config.rms_norm_eps)
+        else:
+            self.post_trunk_norm = None
+
+        self.merger = PatchMerger(
+            dim=config.hidden_size,
+            context_dim=config.embed_dim,
+            spatial_merge_size=config.spatial_merge_size,
+        )
+
+    @property
+    def dtype(self) -> torch.dtype:
+        return self.patch_embed.patchifier.proj.weight.dtype
+
+    @property
+    def device(self) -> torch.device:
+        return self.patch_embed.patchifier.proj.weight.device
+
+    def get_pos_ids_by_grid(self, grid_thw):
+        pos_ids = []
+        for t, h, w in grid_thw:
+            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))
+
+        return pos_ids
+
+    def rot_pos_emb(self, grid_thw):
+        pos_ids = self.get_pos_ids_by_grid(grid_thw)
+        pos_ids = torch.cat(pos_ids, dim=0)
+        max_grid_size = grid_thw[:, 1:].max()
+        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 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:
+            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, hidden_states: torch.Tensor,
+                grid_thw: torch.Tensor) -> torch.Tensor:
+        hidden_states = hidden_states.to(self.dtype)
+        hidden_states = self.patch_embed(hidden_states, grid_thw)
+
+        rotary_pos_emb = self.rot_pos_emb(grid_thw)
+
+        cu_seqlens = torch.repeat_interleave(
+            grid_thw[:, 1] * grid_thw[:, 2], grid_thw[:, 0]).cumsum(
+                dim=0,
+                dtype=grid_thw.dtype
+                if torch.jit.is_tracing() else torch.int32,
+            )
+        cu_seqlens = F.pad(cu_seqlens, (1, 0), value=0)
+
+        max_seqlen, seqlens = self.compute_attn_mask_seqlen(cu_seqlens)
+        for blk in self.blocks:
+            hidden_states = blk(hidden_states,
+                                cu_seqlens=cu_seqlens,
+                                rotary_pos_emb=rotary_pos_emb,
+                                max_seqlen=max_seqlen,
+                                seqlens=seqlens)
+
+        if self.post_trunk_norm is not None:
+            hidden_states = self.post_trunk_norm(hidden_states)
+
+        hidden_states = self.merger(hidden_states)
+        return hidden_states
+
+
+@MULTIMODAL_REGISTRY.register_processor(
+    Qwen2VLMultiModalProcessor,
+    info=DotsOCRProcessingInfo,
+    dummy_inputs=DotsOCRDummyInputsBuilder,
+)
+class DotsOCRForCausalLM(nn.Module, SupportsMultiModal, SupportsPP):
+    hf_to_vllm_mapper = WeightsMapper(
+        orig_to_new_substr={
+            ".attn.qkv_proj.": ".attn.qkv.",
+            ".attn.out_proj.": ".attn.proj.",
+        },
+        orig_to_new_prefix={
+            "lm_head.": "language_model.lm_head.",
+            "model.": "language_model.model.",
+        },
+    )
+
+    @classmethod
+    def get_placeholder_str(cls, modality: str, i: int) -> Optional[str]:
+        if modality.startswith("image"):
+            return "<|img|><|imgpad|><|endofimg|>"
+
+    def __init__(self, *, vllm_config: VllmConfig, prefix: str = ""):
+        super().__init__()
+
+        self.config: DotsOCRConfig = vllm_config.model_config.hf_config
+        self.quant_config = vllm_config.quant_config
+        self.multimodal_config = vllm_config.model_config.multimodal_config
+
+        if isinstance(self.config.vision_config, dict):
+            vision_config = DotsVisionConfig(**self.config.vision_config)
+            self.config.vision_config = vision_config
+        else:
+            vision_config = self.config.vision_config
+
+        self.vision_tower = DotsVisionTransformer(
+            vision_config,
+            quant_config=self.quant_config,
+            prefix=maybe_prefix(prefix, "vision_tower"),
+        )
+        self.language_model: Qwen2ForCausalLM = init_vllm_registered_model(
+            vllm_config=vllm_config,
+            hf_config=self.config,
+            prefix=maybe_prefix(prefix, "language_model"),
+            architectures=["Qwen2ForCausalLM"],
+        )
+
+    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}. "
+                             f"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 torch.concat(list(mm_input))
+        else:
+            return torch.concat(mm_input)
+
+    def _parse_and_validate_image_input(
+            self, **kwargs: object) -> Optional[DotsOCRImageInputs]:
+        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 DotsOCRImagePixelInputs(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 DotsOCRImageEmbeddingInputs(type="image_embeds",
+                                               image_embeds=image_embeds,
+                                               image_grid_thw=image_grid_thw)
+
+    def _process_image_input(
+            self, image_input: DotsOCRImageInputs) -> 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.vision_tower.dtype)
+        else:
+            pixel_values = image_input["pixel_values"].type(
+                self.vision_tower.dtype)
+            image_embeds = self.vision_tower(
+                pixel_values, grid_thw)[:, :self.config.hidden_size]
+
+        # Split concatenated embeddings for each image item.
+        merge_size = self.vision_tower.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 get_language_model(self) -> torch.nn.Module:
+        return self.language_model
+
+    def get_multimodal_embeddings(
+            self, **kwargs: object) -> Optional[MultiModalEmbeddings]:
+        image_input = self._parse_and_validate_image_input(**kwargs)
+        if image_input is None:
+            return []
+        vision_embeddings = self._process_image_input(image_input)
+        return vision_embeddings
+
+    def get_input_embeddings(
+        self,
+        input_ids: torch.Tensor,
+        multimodal_embeddings: Optional[MultiModalEmbeddings] = None,
+    ) -> torch.Tensor:
+        inputs_embeds = self.language_model.get_input_embeddings(input_ids)
+        if multimodal_embeddings is not None:
+            inputs_embeds = merge_multimodal_embeddings(
+                input_ids,
+                inputs_embeds,
+                multimodal_embeddings,
+                self.config.image_token_id,
+            )
+
+        return inputs_embeds
+
+    def forward(
+        self,
+        input_ids: Optional[torch.Tensor],
+        positions: torch.Tensor,
+        intermediate_tensors: Optional[IntermediateTensors] = None,
+        inputs_embeds: Optional[torch.Tensor] = None,
+        **kwargs,
+    ) -> Union[torch.Tensor, IntermediateTensors]:
+        if intermediate_tensors is not None:
+            inputs_embeds = None
+        elif inputs_embeds is None and kwargs.get("pixel_values") is not None:
+            image_input = self._parse_and_validate_image_input(**kwargs)
+            if image_input is None:
+                inputs_embeds = None
+            else:
+                assert input_ids is not None
+                inputs_embeds = self.get_multimodal_embeddings(
+                    input_ids,
+                    image_input=image_input,
+                )
+                input_ids = 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,
+    ) -> Optional[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, mapper=self.hf_to_vllm_mapper)

vllm/model_executor/models/registry.py

@@ -219,6 +219,7 @@ _MULTIMODAL_MODELS = {
     "ChameleonForConditionalGeneration": ("chameleon", "ChameleonForConditionalGeneration"),  # noqa: E501
     "Cohere2VisionForConditionalGeneration": ("cohere2_vision", "Cohere2VisionForConditionalGeneration"),  # noqa: E501
     "DeepseekVLV2ForCausalLM": ("deepseek_vl2", "DeepseekVLV2ForCausalLM"),
+    "DotsOCRForCausalLM": ("dots_ocr", "DotsOCRForCausalLM"),
     "Ernie4_5_VLMoeForConditionalGeneration": ("ernie45_vl", "Ernie4_5_VLMoeForConditionalGeneration"),  # noqa: E501
     "FuyuForCausalLM": ("fuyu", "FuyuForCausalLM"),
     "Gemma3ForConditionalGeneration": ("gemma3_mm", "Gemma3ForConditionalGeneration"),  # noqa: E501

vllm/transformers_utils/configs/__init__.py

@@ -9,6 +9,7 @@ Model configs may be defined in this directory for the following reasons:
 
 from vllm.transformers_utils.configs.chatglm import ChatGLMConfig
 from vllm.transformers_utils.configs.deepseek_vl2 import DeepseekVLV2Config
+from vllm.transformers_utils.configs.dotsocr import DotsOCRConfig
 from vllm.transformers_utils.configs.eagle import EAGLEConfig
 # RWConfig is for the original tiiuae/falcon-40b(-instruct) and
 # tiiuae/falcon-7b(-instruct) models. Newer Falcon models will use the
@@ -36,6 +37,7 @@ from vllm.transformers_utils.configs.ultravox import UltravoxConfig
 __all__ = [
     "ChatGLMConfig",
     "DeepseekVLV2Config",
+    "DotsOCRConfig",
     "EAGLEConfig",
     "RWConfig",
     "JAISConfig",

vllm/transformers_utils/configs/dotsocr.py

@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from typing import Any, Optional
+
+from transformers.configuration_utils import PretrainedConfig
+from transformers.models.qwen2 import Qwen2Config
+
+
+class DotsVisionConfig(PretrainedConfig):
+    model_type: str = "dots_vit"
+
+    def __init__(
+        self,
+        embed_dim: int = 1536,  # vision encoder embed size
+        hidden_size: int = 1536,  # after merger hidden size
+        intermediate_size: int = 4224,
+        num_hidden_layers: int = 42,
+        num_attention_heads: int = 12,
+        num_channels: int = 3,
+        patch_size: int = 14,
+        spatial_merge_size: int = 2,
+        temporal_patch_size: int = 1,
+        rms_norm_eps: float = 1e-5,
+        use_bias: bool = False,
+        attn_implementation="flash_attention_2",
+        initializer_range=0.02,
+        init_merger_std=0.02,
+        is_causal=False,  # ve causal forward
+        post_norm=True,
+        gradient_checkpointing=False,
+        **kwargs: Any,
+    ):
+        super().__init__(**kwargs)
+        self.embed_dim = embed_dim
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+        self.num_channels = num_channels
+        self.patch_size = patch_size
+        self.spatial_merge_size = spatial_merge_size
+        self.temporal_patch_size = temporal_patch_size
+        self.rms_norm_eps = rms_norm_eps
+        self.use_bias = use_bias
+        self.attn_implementation = attn_implementation
+        self.initializer_range = initializer_range
+        self.init_merger_std = init_merger_std
+        self.is_causal = is_causal
+        self.post_norm = post_norm
+        self.gradient_checkpointing = gradient_checkpointing
+
+
+class DotsOCRConfig(Qwen2Config):
+    model_type = "dots_ocr"
+
+    def __init__(self,
+                 image_token_id=151665,
+                 video_token_id=151656,
+                 vision_config: Optional[dict] = None,
+                 *args,
+                 **kwargs):
+        super().__init__(*args, **kwargs)
+        self.image_token_id = image_token_id
+        self.video_token_id = video_token_id
+        self.vision_config = DotsVisionConfig(**(vision_config or {}))
+
+    def save_pretrained(self, save_directory, **kwargs):
+        self._auto_class = None
+        super().save_pretrained(save_directory, **kwargs)