Fix Fuyu image scaling bug (#26918)

* Fix Fuyu image scaling bug

It could produce negative padding and hence inference errors for certain
image sizes.

* Fix aspect ratio scaling test

src/transformers/models/fuyu/image_processing_fuyu.py

@@ -226,7 +226,7 @@ class FuyuImageProcessor(BaseImageProcessor):
         new_height = int(image_height * optimal_scale_factor)
         new_width = int(image_width * optimal_scale_factor)
 
-        scaled_image = resize(image=image, size=(new_width, new_height))
+        scaled_image = resize(image=image, size=(new_height, new_width))
         return np.array(scaled_image)
 
     def _pad_to_target_size(self, image: np.ndarray) -> np.ndarray:

tests/models/fuyu/test_image_processing_fuyu.py

@@ -50,9 +50,10 @@ class TestFuyuImageProcessor(unittest.TestCase):
         ), f"Expected {expected_num_patches} patches, got {patches_final.shape[1]}."
 
     def test_scale_to_target_aspect_ratio(self):
+        # (h:450, w:210) fitting (160, 320) -> (160, 210*160/450)
         scaled_image = self.processor._scale_to_target_aspect_ratio(self.sample_image)
-        self.assertEqual(scaled_image.shape[0], 74)
-        self.assertEqual(scaled_image.shape[1], 160)
+        self.assertEqual(scaled_image.shape[0], 160)
+        self.assertEqual(scaled_image.shape[1], 74)
 
     def test_apply_transformation_numpy(self):
         transformed_image = self.processor.apply_transformation(self.sample_image)