code: def sorted_unique_labels(*ys):
      """Extract an ordered array of unique labels from one or more arrays of
      labels."""
      ys = (cp.unique(y) for y in ys)
      labels = cp.unique(cp.concatenate(ys))
      return labels
  
label_desc: Use image node_id 1 for calling a global function with example usage: sorted_unique_labels() and returns: labels