code: def gen_gs_img_black_edge(h, w):
      img = np.ones((h, w, 1))
      img[:, 0] = 0
      img[:, -1] = 0
      img[0, :] = 0
      img[-1, :] = 0
      return img.astype(np.uint8) * 255
  
label_desc: Use image node_id 1 for calling a global function with example usage: gen_gs_img_black_edge(h, w) and returns: unknown