def assemble(self):
        """Assemble an array from a distributed array of object IDs."""
        first_block = ray.get(self.objectids[(0, ) * self.ndim])
        dtype = first_block.dtype
        result = np.zeros(self.shape, dtype=dtype)
        for index in np.ndindex(*self.num_blocks):
            lower = DistArray.compute_block_lower(index, self.shape)
            upper = DistArray.compute_block_upper(index, self.shape)
            result[[slice(l, u) for (l, u) in zip(lower, upper)]] = ray.get(
                self.objectids[index])
        return result
Assemble an array from a distributed array of object IDs.