vllm.multimodal.inputs ¶

@dataclass(frozen=True, kw_only=True)
class BaseMultiModalField(ABC):
    """
    Defines how to interpret tensor data belonging to a keyword argument in
    [`MultiModalKwargs`][vllm.multimodal.inputs.MultiModalKwargs] for multiple
    multi-modal items, and vice versa.
    """

    keep_on_cpu: bool = False
    """
    If `True`, then this field is excluded from being moved to the accelerator
    when `MultiModalKwargsItems.get_data()` is called to batch the data.
    """

    def _field_factory(self, *, modality: str, key: str):
        f = partial(
            MultiModalFieldElem,
            modality=modality,
            key=key,
            field=self,
        )

        # Allow passing data as positional argument
        def factory(data: NestedTensors) -> MultiModalFieldElem:
            return f(data=data)

        return factory

    @abstractmethod
    def build_elems(
        self,
        modality: str,
        key: str,
        data: NestedTensors,
    ) -> Sequence[MultiModalFieldElem]:
        """
        Construct
        [`MultiModalFieldElem`][vllm.multimodal.inputs.MultiModalFieldElem]
        instances to represent the provided data.

        This is the inverse of
        [`reduce_data`][vllm.multimodal.inputs.BaseMultiModalField.reduce_data].
        """
        raise NotImplementedError

    @abstractmethod
    def _reduce_data(
        self,
        batch: list[NestedTensors],
        *,
        pin_memory: bool,
    ) -> NestedTensors:
        raise NotImplementedError

    def reduce_data(
        self,
        elems: list[MultiModalFieldElem],
        *,
        device: torch.types.Device = None,
        pin_memory: bool = False,
    ) -> NestedTensors:
        """
        Merge the data from multiple instances of
        [`MultiModalFieldElem`][vllm.multimodal.inputs.MultiModalFieldElem].

        This is the inverse of
        [`build_elems`][vllm.multimodal.inputs.BaseMultiModalField.build_elems].
        """
        field_types = [type(item.field) for item in elems]
        if len(set(field_types)) > 1:
            raise ValueError(f"Cannot merge different {field_types=}")

        if device is not None and self.keep_on_cpu:
            device = "cpu"
        if pin_memory and self.keep_on_cpu:
            pin_memory = False

        batch = [elem.data for elem in elems]
        out = self._reduce_data(batch, pin_memory=pin_memory)
        return _nested_tensors_h2d(out, device=device)

@dataclass(frozen=True, kw_only=True)
class MultiModalBatchedField(BaseMultiModalField):
    """
    Info:
        [`MultiModalFieldConfig.batched`][vllm.multimodal.inputs.MultiModalFieldConfig.batched]
    """

    def build_elems(
        self,
        modality: str,
        key: str,
        data: NestedTensors,
    ) -> Sequence[MultiModalFieldElem]:
        field_factory = self._field_factory(modality=modality, key=key)
        return [field_factory(item) for item in data]

    def _reduce_data(
        self,
        batch: list[NestedTensors],
        *,
        pin_memory: bool,
    ) -> NestedTensors:
        if len(batch) > 0 and is_list_of(batch, torch.Tensor, check="all"):
            batch = cast(list[torch.Tensor], batch)
            if len(batch) == 1:
                # An optimization when `batch` contains only one tensor:
                # - produce exactly same result as `torch.stack(batch)`
                # - will achieve zero-copy if the tensor is contiguous
                return batch[0].unsqueeze(0).contiguous()
            first_shape = batch[0].shape
            if all(elem.shape == first_shape for elem in batch):
                out = torch.empty(
                    (len(batch), *batch[0].shape),
                    dtype=batch[0].dtype,
                    device=batch[0].device,
                    pin_memory=pin_memory,
                )
                return torch.stack(batch, out=out)

        return batch

@final
class MultiModalDataBuiltins(TypedDict, total=False):
    """Type annotations for modality types predefined by vLLM."""

    image: ModalityData[ImageItem]
    """The input image(s)."""

    video: ModalityData[VideoItem]
    """The input video(s)."""

    audio: ModalityData[AudioItem]
    """The input audio(s)."""

class MultiModalEncDecInputs(MultiModalInputs):
    """
    Represents the outputs of
    [`EncDecMultiModalProcessor`][vllm.multimodal.processing.EncDecMultiModalProcessor]
    ready to be passed to vLLM internals.
    """

    encoder_prompt_token_ids: list[int]
    """The processed token IDs of the encoder prompt."""

@dataclass
class MultiModalFeatureSpec:
    """
    Represents a single multimodal input with its processed data and metadata.

    Used by the V1 engine to track multimodal data through processing and
    caching. A request containing multiple multimodal items will have one
    MultiModalFeatureSpec per item.
    """

    data: Optional["MultiModalKwargsItem"]
    """Multimodal data for this feature"""

    modality: str
    """Based on the input, e.g., "image", "audio", "video"."""

    identifier: str
    """mm_hash or uuid for caching encoder outputs."""

    mm_position: PlaceholderRange
    """e.g., PlaceholderRange(offset=2, length=336)"""

    @staticmethod
    def gather_kwargs(features: list["MultiModalFeatureSpec"], keys: set[str]):
        kwargs = defaultdict[str, list[NestedTensors]](list)

        for f in features:
            item = f.data
            if item is not None:
                for k in keys:
                    if k in item:
                        kwargs[k].append(item[k].data)

        return dict(kwargs)

@dataclass(frozen=True)
class MultiModalFieldConfig:
    @staticmethod
    def batched(modality: str, *, keep_on_cpu: bool = False):
        """
        Defines a field where an element in the batch is obtained by
        indexing into the first dimension of the underlying data.

        Args:
            modality: The modality of the multi-modal item that uses this
                keyword argument.
            keep_on_cpu: Whether to keep this field on the CPU for the model inputs.

        Example:

        ```
        Input:
            Data: [[AAAA]
                [BBBB]
                [CCCC]]

        Output:
            Element 1: [AAAA]
            Element 2: [BBBB]
            Element 3: [CCCC]
        ```
        """
        return MultiModalFieldConfig(
            field=MultiModalBatchedField(keep_on_cpu=keep_on_cpu),
            modality=modality,
        )

    @staticmethod
    def flat(
        modality: str,
        slices: Sequence[slice] | Sequence[Sequence[slice]],
        dim: int = 0,
        *,
        keep_on_cpu: bool = False,
    ):
        """
        Defines a field where an element in the batch is obtained by
        slicing along the first dimension of the underlying data.

        Args:
            modality: The modality of the multi-modal item that uses this
                keyword argument.
            slices: For each multi-modal item, a slice (dim=0) or a tuple of
                slices (dim>0) that is used to extract the data corresponding
                to it.
            dim: The dimension to extract data, default to 0.
            keep_on_cpu: Whether to keep this field on the CPU for the model inputs.

        Example:

        ```
        Given:
            slices: [slice(0, 3), slice(3, 7), slice(7, 9)]

        Input:
            Data: [AAABBBBCC]

        Output:
            Element 1: [AAA]
            Element 2: [BBBB]
            Element 3: [CC]
        ```

        ```
        Given:
            slices: [
                (slice(None), slice(0, 3)),
                (slice(None), slice(3, 7)),
                (slice(None), slice(7, 9))]
            dim: 1

        Input:
            Data: [[A],[A],[A],[B],[B],[B],[B],[C],[C]]

        Output:
            Element 1: [[A],[A],[A]]
            Element 2: [[B],[B],[B],[B]]
            Element 3: [[C],[C]]
        ```
        """
        return MultiModalFieldConfig(
            field=MultiModalFlatField(
                slices=slices,
                dim=dim,
                keep_on_cpu=keep_on_cpu,
            ),
            modality=modality,
        )

    @staticmethod
    def flat_from_sizes(
        modality: str,
        size_per_item: "torch.Tensor",
        dim: int = 0,
        *,
        keep_on_cpu: bool = False,
    ):
        """
        Defines a field where an element in the batch is obtained by
        slicing along the first dimension of the underlying data.

        Args:
            modality: The modality of the multi-modal item that uses this
                keyword argument.
            size_per_item: For each multi-modal item, the size of the slice
                that is used to extract the data corresponding to it.
            dim: The dimension to slice, default to 0.
            keep_on_cpu: Whether to keep this field on the CPU for the model inputs.

        Example:

        ```
        Given:
            size_per_item: [3, 4, 2]

        Input:
            Data: [AAABBBBCC]

        Output:
            Element 1: [AAA]
            Element 2: [BBBB]
            Element 3: [CC]
        ```

        ```
        Given:
            size_per_item: [3, 4, 2]
            dim: 1

        Input:
            Data: [[A],[A],[A],[B],[B],[B],[B],[C],[C]]

        Output:
            Element 1: [[A],[A],[A]]
            Element 2: [[B],[B],[B],[B]]
            Element 3: [[C],[C]]
        ```

        Info:
            [`MultiModalFieldConfig.flat`][vllm.multimodal.inputs.MultiModalFieldConfig.flat]
        """

        if size_per_item.ndim != 1:
            raise ValueError(
                "size_per_item should be a 1-D tensor, "
                f"but found shape: {size_per_item.shape}"
            )

        slice_idxs = [0, *accumulate(size_per_item)]
        slices = [
            (slice(None, None, None),) * dim
            + (slice(slice_idxs[i], slice_idxs[i + 1]),)
            for i in range(len(size_per_item))
        ]

        return MultiModalFieldConfig.flat(
            modality,
            slices,
            dim=dim,
            keep_on_cpu=keep_on_cpu,
        )

    @staticmethod
    def shared(
        modality: str,
        batch_size: int,
        *,
        keep_on_cpu: bool = False,
    ):
        """
        Defines a field where an element in the batch is obtained by
        taking the entirety of the underlying data.

        This means that the data is the same for each element in the batch.

        Args:
            modality: The modality of the multi-modal item that uses this
                keyword argument.
            batch_size: The number of multi-modal items which share this data.
            keep_on_cpu: Whether to keep this field on the CPU for the model inputs.

        Example:

        ```
        Given:
            batch_size: 4

        Input:
            Data: [XYZ]

        Output:
            Element 1: [XYZ]
            Element 2: [XYZ]
            Element 3: [XYZ]
            Element 4: [XYZ]
        ```
        """
        return MultiModalFieldConfig(
            field=MultiModalSharedField(
                batch_size=batch_size,
                keep_on_cpu=keep_on_cpu,
            ),
            modality=modality,
        )

    field: BaseMultiModalField
    modality: str

    def build_elems(
        self,
        key: str,
        batch: NestedTensors,
    ) -> Sequence[MultiModalFieldElem]:
        return self.field.build_elems(self.modality, key, batch)

@dataclass
class MultiModalFieldElem:
    """
    Represents a keyword argument corresponding to a multi-modal item
    in [`MultiModalKwargs`][vllm.multimodal.inputs.MultiModalKwargs].
    """

    modality: str
    """
    The modality of the corresponding multi-modal item.
    Each multi-modal item can consist of multiple keyword arguments.
    """

    key: str
    """
    The key of this field in
    [`MultiModalKwargs`][vllm.multimodal.inputs.MultiModalKwargs],
    i.e. the name of the keyword argument to be passed to the model.
    """

    data: NestedTensors
    """
    The tensor data of this field in
    [`MultiModalKwargs`][vllm.multimodal.inputs.MultiModalKwargs],
    i.e. the value of the keyword argument to be passed to the model.

    It may be set to `None` if it is determined that the item is cached
    in `EngineCore`.
    """

    field: "BaseMultiModalField"
    """
    Defines how to combine the tensor data of this field with others
    in order to batch multi-modal items together for model inference.
    """

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, self.__class__):
            return False

        if self.data is None:
            data_equal = other.data is None
        elif other.data is None:
            data_equal = self.data is None
        else:
            data_equal = nested_tensors_equal(self.data, other.data)

        return (
            (self.modality, self.key) == (other.modality, other.key)
            and data_equal
            and type(self.field) is type(other.field)
        )  # noqa: E721