[OpenVINO] Add support for Mistral3

docs/source/openvino/models.mdx

@@ -105,6 +105,7 @@ Here is the list of the supported architectures :
 - MiniCPM-o
 - MiniCPMV
 - Mistral
+- Mistral3
 - Mixtral
 - MobileBert
 - MobileNet v1

optimum/exporters/openvino/model_configs.py

@@ -175,6 +175,8 @@
     MiniCPMModelPatcher,
     MiniCPMVImageEmbeddingsModelPatcher,
     MiniCPMVResamplerModelPatcher,
+    Mistral3ImageEmbeddingModelPatcher,
+    Mistral3MultiModalProjectorPatcher,
     MistralModelPatcher,
     MixtralModelPatcher,
     MPTModelPatcher,
@@ -257,6 +259,10 @@ def init_model_configs():
         "transformers",
         "AutoModelForVision2Seq",
     )
+    TasksManager._CUSTOM_CLASSES[("pt", "mistral3", "image-text-to-text")] = (
+        "transformers",
+        "AutoModelForImageTextToText",
+    )
     TasksManager._CUSTOM_CLASSES[("pt", "gemma3", "image-text-to-text")] = (
         "transformers",
         "Gemma3ForConditionalGeneration",
@@ -2053,6 +2059,138 @@ def patch_model_for_export(self, model: PreTrainedModel, model_kwargs: Optional[
         return LlavaNextVideoImageEmbeddingModelPatcher(self, model, model_kwargs)
 
 
+class Mistral3ConfigBehavior(str, enum.Enum):
+    LANGUAGE = "language"
+    VISION_EMBEDDINGS = "vision_embeddings"
+    TEXT_EMBEDDINGS = "text_embeddings"
+    MULTI_MODAL_PROJECTOR = "multi_modal_projector"
+
+
+class DummyMistral3MultiModalProjectorInputGenerator(DummyInputGenerator):
+    SUPPORTED_INPUT_NAMES = ["image_features"]
+
+    def __init__(
+        self,
+        task: str,
+        normalized_config: NormalizedVisionConfig,
+        batch_size: int = DEFAULT_DUMMY_SHAPES["batch_size"],
+        random_batch_size_range: Optional[Tuple[int, int]] = None,
+        **kwargs,
+    ):
+        self.task = task
+        self.batch_size = batch_size
+        self.hidden_size = normalized_config.hidden_size
+        self.spatial_merge_size = getattr(
+            normalized_config.config, "spatial_merge_size",
+            getattr(normalized_config, "spatial_merge_size", 2)
+        )
+        image_size = normalized_config.image_size
+        patch_size = normalized_config.patch_size
+        patches_per_side = image_size // patch_size
+        merged_per_side = patches_per_side // self.spatial_merge_size
+        self.num_merged_patches = merged_per_side * merged_per_side
+
+    def generate(
+        self,
+        input_name: str,
+        framework: str = "pt",
+        int_dtype: str = "int64",
+        float_dtype: str = "fp32",
+    ):
+        input_dim = self.hidden_size * self.spatial_merge_size ** 2
+        shape = [self.num_merged_patches, input_dim]
+        return self.random_float_tensor(shape, framework=framework, dtype=float_dtype)
+
+
+class Mistral3MultiModalProjectorOpenVINOConfig(OnnxConfig):
+    DUMMY_INPUT_GENERATOR_CLASSES = (DummyMistral3MultiModalProjectorInputGenerator,)
+    NORMALIZED_CONFIG_CLASS = NormalizedVisionConfig
+    _MODEL_PATCHER = Mistral3MultiModalProjectorPatcher
+
+    @property
+    def inputs(self) -> Dict[str, Dict[int, str]]:
+        return {"image_features": {0: "num_patches"}}
+
+    @property
+    def outputs(self) -> Dict[str, Dict[int, str]]:
+        return {"hidden_states": {0: "num_patches"}}
+
+
+@register_in_tasks_manager("mistral3", *["image-text-to-text"], library_name="transformers")
+class Mistral3OpenVINOConfig(BaseVLMOpenVINOConfig):
+    MIN_TRANSFORMERS_VERSION = "4.50.0"
+    SUPPORTED_BEHAVIORS = [model_type.value for model_type in Mistral3ConfigBehavior]
+
+    def __init__(
+        self,
+        config: "PretrainedConfig",
+        task: str = "feature-extraction",
+        int_dtype: str = "int64",
+        float_dtype: str = "fp32",
+        behavior: VLMConfigBehavior = VLMConfigBehavior.VISION_EMBEDDINGS,
+        preprocessors: Optional[List[Any]] = None,
+        **kwargs,
+    ):
+        super().__init__(
+            config=config,
+            task=task,
+            int_dtype=int_dtype,
+            float_dtype=float_dtype,
+            preprocessors=preprocessors,
+        )
+        self._orig_config = config
+        if self._behavior == VLMConfigBehavior.VISION_EMBEDDINGS and hasattr(config, "vision_config"):
+            self._config = config.vision_config
+            self._normalized_config = self.NORMALIZED_CONFIG_CLASS(self._config)
+
+    def with_behavior(
+        self,
+        behavior: Union[str, Mistral3ConfigBehavior],
+    ):
+        if isinstance(behavior, str) and not isinstance(behavior, Mistral3ConfigBehavior):
+            behavior = Mistral3ConfigBehavior(behavior)
+
+        if behavior == Mistral3ConfigBehavior.MULTI_MODAL_PROJECTOR:
+            return Mistral3MultiModalProjectorOpenVINOConfig(
+                self._orig_config.vision_config,
+                task="feature-extraction",
+                int_dtype=self.int_dtype,
+                float_dtype=self.float_dtype,
+            )
+
+        return super().with_behavior(behavior)
+
+    def get_model_for_behavior(
+        self, model, behavior: Union[str, Mistral3ConfigBehavior]
+    ):
+        if isinstance(behavior, str) and not isinstance(behavior, Mistral3ConfigBehavior):
+            behavior = Mistral3ConfigBehavior(behavior)
+
+        if behavior == Mistral3ConfigBehavior.MULTI_MODAL_PROJECTOR:
+            return (
+                model.multi_modal_projector
+                if hasattr(model, "multi_modal_projector")
+                else model.model.multi_modal_projector
+            )
+
+        return super().get_model_for_behavior(model, behavior)
+
+    def patch_model_for_export(
+        self, model: PreTrainedModel, model_kwargs: Optional[Dict[str, Any]] = None
+    ):
+        model_kwargs = model_kwargs or {}
+
+        if self._behavior != VLMConfigBehavior.VISION_EMBEDDINGS:
+            return super().patch_model_for_export(model, model_kwargs)
+
+        return Mistral3ImageEmbeddingModelPatcher(self, model, model_kwargs)
+
+    def generate_dummy_inputs(self, framework: str = "pt", **kwargs) -> Dict:
+        if self._behavior == VLMConfigBehavior.VISION_EMBEDDINGS and self._config.model_type == "pixtral":
+            kwargs["batch_size"] = 1
+        return super().generate_dummy_inputs(framework, **kwargs)
+
+
 @register_in_tasks_manager(
     "maira2", *["image-text-to-text", "text-generation", "text-generation-with-past"], library_name="transformers"
 )

optimum/exporters/openvino/model_patcher.py

@@ -3307,6 +3307,66 @@ def __exit__(self, exc_type, exc_value, traceback):
         self._model.forward = self._model.__orig_forward
 
 
+# Adopted from https://github.com/huggingface/transformers/blob/main/src/transformers/models/mistral3/modeling_mistral3.py#L223-L248
+# Mistral3Model.get_image_features() with only projector.norm() applied instead of full projector forward,
+# as the patch_merger cycle block (unfold loop) cannot be traced to OpenVINO IR.
+def mistral3_vision_embed_forward(self, pixel_values):
+    image_features = self.vision_tower(pixel_values, output_hidden_states=True)
+    vision_feature_layer = self.config.vision_feature_layer
+    if isinstance(vision_feature_layer, int):
+        selected_image_feature = image_features.hidden_states[vision_feature_layer]
+    else:
+        hs_pool = [image_features.hidden_states[layer_idx] for layer_idx in vision_feature_layer]
+        selected_image_feature = torch.cat(hs_pool, dim=-1)
+    image_features = self.multi_modal_projector.norm(selected_image_feature.squeeze(0))
+    return image_features
+
+
+# Adopted from https://github.com/huggingface/transformers/blob/main/src/transformers/models/mistral3/modeling_mistral3.py#L118-L124
+# Mistral3MultiModalProjector.forward() and Mistral3PatchMerger.forward() with norm and cycle block excluded.
+# norm is moved to vision_embed_forward, cycle block runs in PyTorch at runtime.
+def mistral3_multi_modal_projector_forward(self, image_features):
+    hidden_states = self.patch_merger.merging_layer(image_features)
+    hidden_states = self.linear_1(hidden_states)
+    hidden_states = self.act(hidden_states)
+    hidden_states = self.linear_2(hidden_states)
+    return hidden_states
+
+
+class Mistral3ImageEmbeddingModelPatcher(ModelPatcher):
+    def __init__(
+        self,
+        config: "OnnxConfig",
+        model: "PreTrainedModel",
+        model_kwargs: Dict[str, Any],
+    ):
+        model.__orig_forward = model.forward
+        model.forward = types.MethodType(mistral3_vision_embed_forward, model)
+
+        super().__init__(config, model, model_kwargs)
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        super().__exit__(exc_type, exc_value, traceback)
+        self._model.forward = self._model.__orig_forward
+
+
+class Mistral3MultiModalProjectorPatcher(ModelPatcher):
+    def __init__(
+        self,
+        config: "OnnxConfig",
+        model: "PreTrainedModel",
+        model_kwargs: Dict[str, Any],
+    ):
+        model.__orig_forward = model.forward
+        model.forward = types.MethodType(mistral3_multi_modal_projector_forward, model)
+
+        super().__init__(config, model, model_kwargs)
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        super().__exit__(exc_type, exc_value, traceback)
+        self._model.forward = self._model.__orig_forward
+
+
 def _embednb_forward(self, ids: torch.Tensor) -> torch.Tensor:
     def rope(pos: torch.Tensor, dim: int, theta: int) -> torch.Tensor:
         assert dim % 2 == 0, "The dimension must be even."

optimum/exporters/openvino/utils.py

@@ -288,6 +288,7 @@ def get_submodels(model):
     "llava_next",
     "llava_next_video",
     "llava-qwen2",
+    "mistral3",
     "internvl_chat",
     "maira2",
     "minicpmv",

optimum/intel/openvino/modeling_visual_language.py

@@ -1699,6 +1699,94 @@ def get_video_features(self, pixel_values, input_ids=None, **kwargs):
         return video_features
 
 
+class _OVMistral3ForCausalLM(OVModelForVisualCausalLM):
+    additional_parts = ["multi_modal_projector"]
+
+    def get_vision_embeddings(self, pixel_values, input_ids=None, image_sizes=None, **kwargs):
+        if input_ids is not None and input_ids.shape[1] == 1:
+            return None
+
+        image_features = self.vision_embeddings(pixel_values).last_hidden_state
+        image_features = torch.from_numpy(image_features) if isinstance(image_features, np.ndarray) else image_features
+
+        # Adopted from https://github.com/huggingface/transformers/blob/main/src/transformers/models/mistral3/modeling_mistral3.py#L75-L96
+        patch_size = self.config.vision_config.patch_size
+        spatial_merge_size = self.config.spatial_merge_size
+        d = image_features.shape[-1]
+
+        image_sizes_scaled = [
+            (size[0] // patch_size, size[1] // patch_size)
+            for size in image_sizes
+        ]
+        tokens_per_image = [h * w for h, w in image_sizes_scaled]
+
+        permuted_tensor = []
+        for image_index, image_tokens in enumerate(image_features.split(tokens_per_image)):
+            h, w = image_sizes_scaled[image_index]
+            image_grid = image_tokens.view(h, w, d).permute(2, 0, 1).unsqueeze(0)
+            grid = torch.nn.functional.unfold(
+                image_grid,
+                kernel_size=spatial_merge_size,
+                stride=spatial_merge_size,
+            )
+            grid = grid.view(d * spatial_merge_size**2, -1).t()
+            permuted_tensor.append(grid)
+
+        image_features = torch.cat(permuted_tensor, dim=0)
+        image_features = self.multi_modal_projector(image_features)
+
+        return image_features
+
+    # Adopted from https://github.com/huggingface/transformers/blob/main/src/transformers/models/mistral3/modeling_mistral3.py#L258-L280
+    # and https://github.com/huggingface/transformers/blob/main/src/transformers/models/mistral3/modeling_mistral3.py#L313-L324
+    def merge_vision_text_embeddings(
+        self,
+        vision_embeds,
+        inputs_embeds,
+        input_ids=None,
+        attention_mask=None,
+        position_ids=None,
+        **kwargs,
+    ):
+        image_features = torch.from_numpy(vision_embeds) if isinstance(vision_embeds, np.ndarray) else vision_embeds
+        inputs_embeds = torch.from_numpy(inputs_embeds) if isinstance(inputs_embeds, np.ndarray) else inputs_embeds
+
+        special_image_mask = (input_ids == self.config.image_token_id).unsqueeze(-1)
+        special_image_mask = special_image_mask.expand_as(inputs_embeds).to(inputs_embeds.device)
+        image_features = image_features.to(inputs_embeds.device, inputs_embeds.dtype)
+        inputs_embeds = inputs_embeds.masked_scatter(special_image_mask, image_features)
+
+        return inputs_embeds, attention_mask, position_ids
+
+    @staticmethod
+    def preprocess_inputs(
+        text: str,
+        image: Optional["Image"] = None,
+        processor: Optional[AutoImageProcessor] = None,
+        tokenizer: Optional[PreTrainedTokenizer] = None,
+        config: Optional[PretrainedConfig] = None,
+        video: Optional["VideoInput"] = None,
+        audio: Optional[np.ndarray] = None,
+    ):
+        if processor is None:
+            raise ValueError("Processor is required.")
+        if video is not None or audio is not None:
+            raise ValueError("Video/Audio input is not supported for Mistral3")
+
+        conversation = [
+            {
+                "role": "user",
+                "content": [{"type": "text", "text": text}],
+            }
+        ]
+        if image is not None:
+            conversation[0]["content"].insert(0, {"type": "image"})
+
+        prompt = processor.apply_chat_template(conversation, add_generation_prompt=True)
+        inputs = processor(images=image, text=prompt, return_tensors="pt")
+        return inputs
+
+
 class _OVInternVLForCausalLM(OVModelForVisualCausalLM):
     def get_vision_embeddings(self, pixel_values, input_ids=None, **kwargs):
         if input_ids is not None and input_ids.shape[1] == 1:
@@ -4806,6 +4894,7 @@ def preprocess_inputs(
     "llava": _OVLlavaForCausalLM,
     "llava_next": _OVLlavaNextForCausalLM,
     "llava_next_video": _OVLlavaNextVideoForCausalLM,
+    "mistral3": _OVMistral3ForCausalLM,
     "minicpmv": _OVMiniCPMVForCausalLM,
     "llava-qwen2": _OVNanoLlavaForCausalLM,
     "maira2": _OVMaira2ForCausalLM,

tests/openvino/test_export.py

@@ -101,6 +101,9 @@ class ExportModelTest(unittest.TestCase):
     if is_transformers_version(">=", "4.49"):
         SUPPORTED_ARCHITECTURES.update({"zamba2": OVModelForCausalLM})
 
+    if is_transformers_version(">=", "4.50.0"):
+        SUPPORTED_ARCHITECTURES.update({"mistral3": OVModelForVisualCausalLM})
+
     if is_transformers_version(">=", "4.53.0"):
         SUPPORTED_ARCHITECTURES.update({"granitemoehybrid": OVModelForCausalLM})
 

tests/openvino/test_exporters_cli.py

@@ -123,6 +123,13 @@ class OVCLIExportTestCase(unittest.TestCase):
             ]
         )
 
+    if is_transformers_version(">=", "4.50.0"):
+        SUPPORTED_ARCHITECTURES.extend(
+            [
+                ("image-text-to-text", "mistral3"),
+            ]
+        )
+
     if is_transformers_version(">=", "4.54.0"):
         SUPPORTED_ARCHITECTURES.extend(
             [

tests/openvino/test_genai.py

@@ -243,6 +243,7 @@ def _get_model_class(self, model_arch):
             "llava",
             "llava_next",
             "llava_next_mistral",
+            "mistral3",
             "qwen2_vl",
             "qwen2_5_vl",
             "gemma3",

tests/openvino/test_quantization.py

@@ -1077,6 +1077,9 @@ class OVWeightCompressionTest(unittest.TestCase):
     if is_transformers_version(">=", "4.48.0"):
         SUPPORTED_ARCHITECTURES_WITH_AUTO_COMPRESSION.append((OVModelForCausalLM, "cohere2", False))
 
+    if is_transformers_version(">=", "4.50.0"):
+        SUPPORTED_ARCHITECTURES_WITH_AUTO_COMPRESSION.append((OVModelForVisualCausalLM, "mistral3", False))
+
     if is_transformers_version(">=", "4.54.0"):
         SUPPORTED_ARCHITECTURES_WITH_AUTO_COMPRESSION.append((OVModelForCausalLM, "exaone4", True))