code: def with_rank_at_least(self, rank):
          
          if self.ndims is not None and self.ndims < rank:
              raise ValueError("Shape %s must have rank at least %d" % (self, rank))
          else:
              return self
docs: Returns a shape based on `self` with at least the given rank.
  
          Args:
            rank: An integer.
  
          Returns:
            A shape that is at least as specific as `self` with at least the given
            rank.
  
          Raises:
            ValueError: If `self` does not represent a shape with at least the given
              `rank`.