class_docstr: Convert color space from LAB to RGB.
class_docstr_tok: ["Convert","color","space","from","LAB","to","RGB","."]
docstr: Convert color space from LAB to RGB.
  
  Args:
     img(np.ndarray): Original LAB image.
  
  Return:
      img(np.ndarray): Converted RGB image.
code: def lab2rgb(self, lab_rs: np.ndarray) -> np.ndarray:
      """
      Convert color space from LAB to RGB.
  
      Args:
         img(np.ndarray): Original LAB image.
  
      Return:
          img(np.ndarray): Converted RGB image.
      """
      l = lab_rs[:, [0], :, :] * 100 + 50
      ab = lab_rs[:, 1:, :, :] * 110
      lab = np.concatenate((l, ab), axis=1)
      out = self.xyz2rgb(self.lab2xyz(lab))
      return out
  
imports: import random
  from typing import Callable, Union, List, Tuple
  import cv2
  import PIL
  import numpy
  import paddlehub.vision.functional
label_desc: Use image node_id 4 for calling the LAB2RGB obj's underlying member method code with example usage: obj.lab2rgb(lab_rs) and returns: out