code: def test_lab2hsv():
      cv_lab = cv.cvtColor(cv_bgr, cv.COLOR_BGR2LAB)
      cv_lab = caer.to_tensor(cv_lab, cspace="lab")
  
      hsv = caer.lab2hsv(cv_lab)
  
      assert len(hsv.shape) == 3
      assert isinstance(hsv, caer.Tensor)
      assert hsv.is_hsv()
  
file_path: caer/tests/color/test_lab.py
imports: import caer
  import cv2
  import os
label_desc: Use image node_id 4 for calling a global function with example usage: test_lab2hsv() without return types