🚨🚨🚨 Vivit update default rescale_factor value (#25547)

* Update default rescale_factor value

* Formatting

src/transformers/models/vivit/image_processing_vivit.py

@@ -84,7 +84,7 @@ class VivitImageProcessor(BaseImageProcessor):
         do_rescale (`bool`, *optional*, defaults to `True`):
             Whether to rescale the image by the specified scale `rescale_factor`. Can be overridden by the `do_rescale`
             parameter in the `preprocess` method.
-        rescale_factor (`int` or `float`, *optional*, defaults to `1/255`):
+        rescale_factor (`int` or `float`, *optional*, defaults to 1/127.5):
             Defines the scale factor to use if rescaling the image. Can be overridden by the `rescale_factor` parameter
             in the `preprocess` method.
         offset (`bool`, *optional*, defaults to `True`):
@@ -111,7 +111,7 @@ class VivitImageProcessor(BaseImageProcessor):
         do_center_crop: bool = True,
         crop_size: Dict[str, int] = None,
         do_rescale: bool = True,
-        rescale_factor: Union[int, float] = 1 / 255,
+        rescale_factor: Union[int, float] = 1 / 127.5,
         offset: bool = True,
         do_normalize: bool = True,
         image_mean: Optional[Union[float, List[float]]] = None,