Migrate LlavaImageInputs to TensorSchema (#21770)

Signed-off-by: Benji Beck <benjibeck@meta.com>

vllm/model_executor/models/llava.py

@@ -3,7 +3,7 @@
 
 from abc import abstractmethod
 from collections.abc import Iterable, Mapping, Sequence
-from typing import (Final, Literal, Optional, Protocol, TypedDict, TypeVar,
+from typing import (Annotated, Final, Literal, Optional, Protocol, TypeVar,
                     Union, cast)
 
 import torch
@@ -33,6 +33,7 @@ from vllm.multimodal.processing import (BaseMultiModalProcessor,
                                         PromptUpdateDetails)
 from vllm.multimodal.profiling import BaseDummyInputsBuilder
 from vllm.sequence import IntermediateTensors
+from vllm.utils.tensor_schema import TensorSchema, TensorShape
 
 from .clip import CLIPVisionModel
 from .interfaces import MultiModalEmbeddings, SupportsMultiModal, SupportsPP
@@ -44,35 +45,46 @@ from .utils import (AutoWeightsLoader, WeightsMapper, flatten_bn,
 from .vision import get_vision_encoder_info
 
 
-class LlavaImagePixelInputs(TypedDict):
-    type: Literal["pixel_values"]
-    pixel_values: torch.Tensor
+class LlavaImagePixelInputs(TensorSchema):
     """
-    Shape: `(batch_size * num_images, num_channels, height, width)`
+    Dimensions:
+        - bn: Batch size * number of images
+        - c: Number of channels (3)
+        - h: Height
+        - w: 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.
     """
+    type: Literal["pixel_values"] = "pixel_values"
+    pixel_values: Annotated[torch.Tensor, TensorShape("bn", 3, "h", "w")]
 
 
-class PixtralHFImagePixelInputs(TypedDict):
-    type: Literal["pixel_values_pixtral"]
-    pixel_values: Union[torch.Tensor, list[torch.Tensor]]
+class PixtralHFImagePixelInputs(TensorSchema):
     """
-    Shape: `(batch_size * num_images, num_channels, height, width)`
+    Dimensions:
+        - bn: Batch size * number of images
+        - c: Number of channels
+        - h: Height
+        - w: 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.
     """
+    type: Literal["pixel_values_pixtral"] = "pixel_values_pixtral"
+    pixel_values: Annotated[Union[torch.Tensor, list[torch.Tensor]],
+                            TensorShape("bn", "c", "h", "w")]
 
 
-class LlavaImageEmbeddingInputs(TypedDict):
-    type: Literal["image_embeds"]
-    data: torch.Tensor
-    """Shape: `(batch_size * num_images, image_feature_size, hidden_size)`
-
-    `hidden_size` must match the hidden size of language model backbone.
+class LlavaImageEmbeddingInputs(TensorSchema):
     """
+    Dimensions:
+        - bn: Batch size * number of images
+        - ifs: Image feature size
+        - hs: Hidden size (must match language model backbone)
+    """
+    type: Literal["image_embeds"] = "image_embeds"
+    data: Annotated[torch.Tensor, TensorShape("bn", "ifs", "hs")]
 
 
 LlavaImageInputs = Union[LlavaImagePixelInputs, PixtralHFImagePixelInputs,
@@ -547,19 +559,6 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
         self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors)
 
-    def _validate_pixel_values(self, data: torch.Tensor) -> torch.Tensor:
-        h = w = self.config.vision_config.image_size
-        expected_dims = (3, h, w)
-        actual_dims = tuple(data.shape[1:])
-
-        if actual_dims != expected_dims:
-            expected_expr = ("batch_size", *map(str, expected_dims))
-            raise ValueError(
-                f"The expected shape of pixel values is {expected_expr}. "
-                f"You supplied {tuple(data.shape)}.")
-
-        return data
-
     def _parse_and_validate_image_input(
             self, **kwargs: object) -> Optional[LlavaImageInputs]:
         pixel_values = kwargs.pop("pixel_values", None)
@@ -579,10 +578,14 @@ class LlavaForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP):
                     pixel_values=flatten_bn(pixel_values),
                 )
 
+            expected_h = expected_w = self.config.vision_config.image_size
             return LlavaImagePixelInputs(
                 type="pixel_values",
-                pixel_values=self._validate_pixel_values(
-                    flatten_bn(pixel_values, concat=True)),
+                pixel_values=flatten_bn(pixel_values, concat=True),
+                resolve_bindings={
+                    "h": expected_h,
+                    "w": expected_w
+                },
             )
 
         if image_embeds is not None: