docs: def sample_lists(items_list, num=1, seed=None):
      r"""
      Args:
          items_list (list):
          num (int): (default = 1)
          seed (None): (default = None)
  
      Returns:
          list: samples_list
  
      CommandLine:
          python -m utool.util_list --exec-sample_lists
  
      Example:
          >>> # DISABLE_DOCTEST
          >>> from utool.util_list import *  # NOQA
          >>> items_list = [[], [1, 2, 3], [4], [5, 6], [7, 8, 9, 10]]
          >>> num = 2
          >>> seed = 0
          >>> samples_list = sample_lists(items_list, num, seed)
          >>> result = ('samples_list = %s' % (str(samples_list),))
          >>> print(result)
          samples_list = [[], [3, 2], [4], [5, 6], [10, 9]]
      """
      if seed is not None:
          rng = np.random.RandomState(seed)
      else:
          rng = np.random
      def random_choice(items, num):
          size = min(len(items), num)
          return rng.choice(items, size, replace=False).tolist()
      samples_list = [random_choice(items, num)
                      if len(items) > 0 else []
                      for items in items_list]
      return samples_list