Migrate LlavaNextImageInputs to TensorSchema (#21774)

Signed-off-by: Benji Beck <benjibeck@meta.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

vllm/model_executor/models/llava_next.py

@@ -3,7 +3,7 @@
 
 from abc import abstractmethod
 from collections.abc import Iterable, Mapping
-from typing import (Final, Literal, Optional, Protocol, TypedDict, TypeVar,
+from typing import (Annotated, Final, Literal, Optional, Protocol, TypeVar,
                     Union)
 
 import torch
@@ -11,7 +11,6 @@ import torch.nn as nn
 from transformers import BatchFeature, LlavaNextConfig, LlavaNextProcessor
 from transformers.models.llava_next.modeling_llava_next import (
     get_anyres_image_grid_shape, unpad_image)
-from typing_extensions import NotRequired
 
 from vllm.config import VllmConfig
 from vllm.model_executor.sampling_metadata import SamplingMetadata
@@ -19,6 +18,7 @@ from vllm.multimodal import MULTIMODAL_REGISTRY
 from vllm.multimodal.inputs import MultiModalFieldConfig
 from vllm.multimodal.parse import ImageSize
 from vllm.sequence import IntermediateTensors
+from vllm.utils.tensor_schema import TensorSchema, TensorShape
 
 from .clip import CLIPVisionModel
 from .interfaces import MultiModalEmbeddings, SupportsMultiModal, SupportsPP
@@ -30,32 +30,36 @@ from .utils import (AutoWeightsLoader, WeightsMapper, embed_multimodal,
                     flatten_bn, init_vllm_registered_model, maybe_prefix)
 
 
-class LlavaNextImagePixelInputs(TypedDict):
-    type: Literal["pixel_values"]
-    pixel_values: Union[torch.Tensor, list[torch.Tensor]]
+class LlavaNextImagePixelInputs(TensorSchema):
     """
-    Shape:
-    `(batch_size * num_images, 1 + num_patches, num_channels, height, width)`
-
+    Dimensions:
+        - bn: Batch size * number of images
+        - np: Number of patches + 1
+        - c: Number of channels (3)
+        - h: Height
+        - w: Width
+    
     Note that `num_patches` 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[
+        Union[torch.Tensor, list[torch.Tensor]],
+        TensorShape("bn", "np", 3, "h", "w", dynamic_dims={"np"})]
 
-    image_sizes: NotRequired[torch.Tensor]
-    """
-    Shape: `(batch_size * num_images, 2)`
-
-    This should be in `(height, width)` format.
-    """
-
+    image_sizes: Annotated[Optional[torch.Tensor], TensorShape("bn", 2)]
+    # This should be in `(height, width)` format.
 
-class LlavaNextImageEmbeddingInputs(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 LlavaNextImageEmbeddingInputs(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")]
 
 
 LlavaNextImageInputs = Union[LlavaNextImagePixelInputs,
@@ -269,44 +273,6 @@ class LlavaNextForConditionalGeneration(nn.Module, SupportsMultiModal,
         self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors)
 
-    def _validate_image_sizes(self, data: torch.Tensor) -> torch.Tensor:
-        expected_dims = (2, )
-
-        def _validate_shape(d: torch.Tensor):
-            actual_dims = tuple(d.shape)
-
-            if actual_dims != expected_dims:
-                expected_expr = str(expected_dims)
-                raise ValueError(
-                    f"The expected shape of image sizes per image per batch "
-                    f"is {expected_expr}. You supplied {tuple(d.shape)}.")
-
-        for d in data:
-            _validate_shape(d)
-
-        return data
-
-    def _validate_pixel_values(
-        self, data: Union[torch.Tensor, list[torch.Tensor]]
-    ) -> Union[torch.Tensor, list[torch.Tensor]]:
-
-        h = w = self.config.vision_config.image_size
-        expected_dims = (3, h, w)
-
-        def _validate_shape(d: torch.Tensor):
-            actual_dims = tuple(d.shape[1:])
-
-            if actual_dims != expected_dims:
-                expected_expr = ("num_patches", *map(str, expected_dims))
-                raise ValueError(
-                    "The expected shape of pixel values per image per batch "
-                    f"is {expected_expr}. You supplied {tuple(d.shape)}.")
-
-        for d in data:
-            _validate_shape(d)
-
-        return data
-
     def _parse_and_validate_image_input(
             self, **kwargs: object) -> Optional[LlavaNextImageInputs]:
         pixel_values = kwargs.pop("pixel_values", None)
@@ -325,13 +291,15 @@ class LlavaNextForConditionalGeneration(nn.Module, SupportsMultiModal,
                 raise ValueError("Incorrect type of image sizes. "
                                  f"Got type: {type(image_sizes)}")
 
+            expected_h = expected_w = self.config.vision_config.image_size
             return LlavaNextImagePixelInputs(
                 type="pixel_values",
-                pixel_values=self._validate_pixel_values(
-                    flatten_bn(pixel_values)),
-                image_sizes=self._validate_image_sizes(
-                    flatten_bn(image_sizes, concat=True)),
-            )
+                pixel_values=flatten_bn(pixel_values),
+                image_sizes=flatten_bn(image_sizes, concat=True),
+                resolve_bindings={
+                    "h": expected_h,
+                    "w": expected_w,
+                })
 
         if image_embeds is not None:
             if not isinstance(image_embeds, torch.Tensor):

vllm/utils/tensor_schema.py

@@ -60,6 +60,9 @@ class TensorSchema:
     def __getitem__(self, item) -> Any:
         return getattr(self, item)
 
+    def get(self, item, default=None) -> Any:
+        return getattr(self, item, default)
+
     def _match_shape_with_dynamic(self, actual: tuple[int, ...],
                                   reference: tuple[int, ...],
                                   expected_shape: tuple[Union[int, str], ...],