code: def get_next_iteration(self, iteration, iteration_kwargs={}):
  		
  		
  		# number of 'SH rungs'
  		s = self.max_SH_iter - 1 - (iteration%self.max_SH_iter)
  		# number of configurations in that bracket
  		n0 = int(np.floor((self.max_SH_iter)/(s+1)) * self.eta**s)
  		ns = [max(int(n0*(self.eta**(-i))), 1) for i in range(s+1)]
  
  		return(SuccessiveHalving(HPB_iter=iteration, num_configs=ns, budgets=self.budgets[(-s-1):], config_sampler=self.config_generator.get_config, **iteration_kwargs))
docs: BO-HB uses (just like Hyperband) SuccessiveHalving for each iteration.
  		See Li et al. (2016) for reference.
  		
  		Parameters
  		----------
  			iteration: int
  				the index of the iteration to be instantiated
  
  		Returns
  		-------
  			SuccessiveHalving: the SuccessiveHalving iteration with the
  				corresponding number of configurations