class_docstr: A bracket in Hyperband, all the information of a bracket is managed by an instance of this class
  
  Parameters
  ----------
  bracket_id: string
      The id of this bracket, usually be set as '{Hyperband index}-{SH iteration index}'
  s: int
      The current SH iteration index.
  s_max: int
      total number of SH iterations
  eta: float
      In each iteration, a complete run of sequential halving is executed. In it,
              after evaluating each configuration on the same subset size, only a fraction of
              1/eta of them 'advances' to the next round.
  R:
      the budget associated with each stage
  optimize_mode: str
      optimize mode, 'maximize' or 'minimize'
docstr: check whether this bracket has sent out all the hyperparameter configurations
docstr_tok: ["check","whether","this","bracket","has","sent","out","all","the","hyperparameter","configurations"]
code: def is_completed(self):
      """check whether this bracket has sent out all the hyperparameter configurations"""
      return self.no_more_trial
  
imports: import copy
  import logging
  import math
  import sys
  import numpy
  from schema import Schema, Optional
  import nni
  from nni import ClassArgsValidator
  from nni.common.hpo_utils import validate_search_space
  from nni.runtime.common import multi_phase_enabled
  from nni.runtime.msg_dispatcher_base import MsgDispatcherBase
  from nni.runtime.tuner_command_channel import CommandType
  from nni.utils import NodeType, OptimizeMode, MetricType, extract_scalar_reward
  from nni import parameter_expressions
label_desc: Use image node_id 2 for calling the Bracket obj's underlying member method code with example usage: obj.is_completed() and returns: self