old_contents: from chainer.training.extensions import _snapshot  # NOQA
  from chainer.training.extensions import computational_graph  # NOQA
  from chainer.training.extensions import evaluator  # NOQA
  from chainer.training.extensions import exponential_shift  # NOQA
  from chainer.training.extensions import linear_shift  # NOQA
  from chainer.training.extensions import log_report  # NOQA
  from chainer.training.extensions import micro_average  # NOQA
  from chainer.training.extensions import plot_report  # NOQA
  from chainer.training.extensions import print_report  # NOQA
  from chainer.training.extensions import progress_bar  # NOQA
  from chainer.training.extensions import value_observation  # NOQA
  
  
  # import class and function
  from chainer.training.extensions._snapshot import snapshot  # NOQA
  from chainer.training.extensions._snapshot import snapshot_object  # NOQA
  from chainer.training.extensions.computational_graph import dump_graph  # NOQA
  from chainer.training.extensions.evaluator import Evaluator  # NOQA
  from chainer.training.extensions.exponential_shift import ExponentialShift  # NOQA
  from chainer.training.extensions.linear_shift import LinearShift  # NOQA
  from chainer.training.extensions.log_report import LogReport  # NOQA
  from chainer.training.extensions.parameter_statistics import ParameterStatistics  # NOQA
  from chainer.training.extensions.micro_average import MicroAverage  # NOQA
  from chainer.training.extensions.plot_report import PlotReport  # NOQA
  from chainer.training.extensions.print_report import PrintReport  # NOQA
  from chainer.training.extensions.progress_bar import ProgressBar  # NOQA
  from chainer.training.extensions.value_observation import observe_lr  # NOQA
  from chainer.training.extensions.value_observation import observe_value  # NOQA
  
new_contents: from chainer.training.extensions import _snapshot  # NOQA
  from chainer.training.extensions import computational_graph  # NOQA
  from chainer.training.extensions import evaluator  # NOQA
  from chainer.training.extensions import exponential_shift  # NOQA
  from chainer.training.extensions import linear_shift  # NOQA
  from chainer.training.extensions import log_report  # NOQA
  from chainer.training.extensions import micro_average  # NOQA
  from chainer.training.extensions import plot_report  # NOQA
  from chainer.training.extensions import print_report  # NOQA
  from chainer.training.extensions import progress_bar  # NOQA
  from chainer.training.extensions import value_observation  # NOQA
  
  
  # import class and function
  from chainer.training.extensions._snapshot import snapshot  # NOQA
  from chainer.training.extensions._snapshot import snapshot_object  # NOQA
  from chainer.training.extensions.computational_graph import dump_graph  # NOQA
  from chainer.training.extensions.evaluator import Evaluator  # NOQA
  from chainer.training.extensions.exponential_shift import ExponentialShift  # NOQA
  from chainer.training.extensions.linear_shift import LinearShift  # NOQA
  from chainer.training.extensions.log_report import LogReport  # NOQA
  from chainer.training.extensions.micro_average import MicroAverage  # NOQA
  from chainer.training.extensions.parameter_statistics import ParameterStatistics  # NOQA
  from chainer.training.extensions.plot_report import PlotReport  # NOQA
  from chainer.training.extensions.print_report import PrintReport  # NOQA
  from chainer.training.extensions.progress_bar import ProgressBar  # NOQA
  from chainer.training.extensions.value_observation import observe_lr  # NOQA
  from chainer.training.extensions.value_observation import observe_value  # NOQA
  
subject: Update __init__.py