Remove deprecated function

image_transformation.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python3
 import numpy as np
 import torch
+import cv2
 
 from transformers.tools.base import Tool, get_default_device
 from transformers.utils import (
     is_accelerate_available,
     is_vision_available,
-    is_opencv_available,
 )
 from diffusers import StableDiffusionControlNetPipeline, ControlNetModel, UniPCMultistepScheduler
 
@@ -14,8 +14,6 @@ from diffusers import StableDiffusionControlNetPipeline, ControlNetModel, UniPCM
 if is_vision_available():
     from PIL import Image
 
-if is_opencv_available():
-    import cv2
 
 
 IMAGE_TRANSFORMATION_DESCRIPTION = (