[llava] one pixel is missing from padding when length is odd (#37819)

* [fix] one pixel should be added when length is odd

* [fix] add vision_aspect_ratio args & typo

* [fix] style

* [fix] do not fix fast file directly

* [fix] convert using modular

* remove duplicate codes

* match unpad logic with pad logic

* test odd-sized images for llava & aria

* test unpad odd-sized padding for llava family

* fix style

* add kwarg to onvision modular

* move vision_aspect_ratio from image_processor to processor
(llava_onevision)

tests/models/llava_next/test_image_processing_llava_next.py

@@ -16,7 +16,7 @@ import unittest
 
 import numpy as np
 
-from transformers.image_utils import OPENAI_CLIP_MEAN, OPENAI_CLIP_STD
+from transformers.image_utils import OPENAI_CLIP_MEAN, OPENAI_CLIP_STD, ChannelDimension
 from transformers.models.llava_next.image_processing_llava_next import select_best_resolution
 from transformers.testing_utils import require_torch, require_vision
 from transformers.utils import is_torch_available, is_torchvision_available, is_vision_available
@@ -230,3 +230,38 @@ class LlavaNextImageProcessingTest(ImageProcessingTestMixin, unittest.TestCase):
 
             # Image processor should return same pixel values, independently of ipnut format
             self.assertTrue((encoded_images_nested == encoded_images).all())
+
+    def test_pad_for_patching(self):
+        for image_processing_class in self.image_processor_list:
+            if image_processing_class == self.fast_image_processing_class:
+                numpify = False
+                torchify = True
+                input_data_format = image_processing_class.data_format
+            else:
+                numpify = True
+                torchify = False
+                input_data_format = ChannelDimension.LAST
+            image_processing = image_processing_class(**self.image_processor_dict)
+            # Create odd-sized images
+            image_input = self.image_processor_tester.prepare_image_inputs(
+                equal_resolution=True,
+                numpify=numpify,
+                torchify=torchify,
+            )[0]
+            self.assertIn(image_input.shape, [(3, 400, 400), (400, 400, 3)])
+
+            # Test odd-width
+            image_shape = (400, 601)
+            encoded_images = image_processing._pad_for_patching(image_input, image_shape, input_data_format)
+            encoded_image_shape = (
+                encoded_images.shape[:-1] if input_data_format == ChannelDimension.LAST else encoded_images.shape[1:]
+            )
+            self.assertEqual(encoded_image_shape, image_shape)
+
+            # Test odd-height
+            image_shape = (503, 400)
+            encoded_images = image_processing._pad_for_patching(image_input, image_shape, input_data_format)
+            encoded_image_shape = (
+                encoded_images.shape[:-1] if input_data_format == ChannelDimension.LAST else encoded_images.shape[1:]
+            )
+            self.assertEqual(encoded_image_shape, image_shape)

tests/models/llava_next/test_modeling_llava_next.py

@@ -48,7 +48,7 @@ from ...test_modeling_common import (
 if is_torch_available():
     import torch
 
-    from transformers.models.llava_next.modeling_llava_next import image_size_to_num_patches
+    from transformers.models.llava_next.modeling_llava_next import image_size_to_num_patches, unpad_image
 
 
 if is_vision_available():
@@ -288,6 +288,19 @@ class LlavaNextForConditionalGenerationModelTest(ModelTesterMixin, GenerationTes
             image_sizes = torch.cat([image_sizes, image_sizes], dim=0)
             _ = model(input_ids=input_ids, pixel_values=pixel_values, image_sizes=image_sizes)
 
+    def test_unpad_image(self):
+        original_size = (400, 400)
+
+        # Test case width is padded
+        pixel_values = floats_tensor([3, 400, 601])
+        unpadded_tensor = unpad_image(pixel_values, original_size)
+        self.assertEqual(unpadded_tensor.shape[1:], original_size)
+
+        # Test case height is padded
+        pixel_values = floats_tensor([3, 503, 400])
+        unpadded_tensor = unpad_image(pixel_values, original_size)
+        self.assertEqual(unpadded_tensor.shape[1:], original_size)
+
     @parameterized.expand(
         [
             (-1,),