code: def _set1(self):
      self.rbuf.update_errors([1.0])
  
imports: import collections
  import copy
  import os
  import tempfile
  import unittest
  from chainer import testing
  import numpy
  from chainerrl import replay_buffer
label_desc: Use image node_id 3 for calling the TestReplayBufferFail obj's underlying member method code with example usage: obj._set1() without return types