old_contents: -# import classes and functions
  from chainer.optimizers.ada_delta import AdaDelta  # NOQA
  from chainer.optimizers.ada_grad import AdaGrad  # NOQA
  from chainer.optimizers.adam import Adam  # NOQA
  from chainer.optimizers.momentum_sgd import MomentumSGD  # NOQA
  from chainer.optimizers.msvag import MSVAG  # NOQA
  from chainer.optimizers.nesterov_ag import NesterovAG  # NOQA
  from chainer.optimizers.rmsprop import RMSprop  # NOQA
  from chainer.optimizers.rmsprop_graves import RMSpropGraves  # NOQA
  from chainer.optimizers.sgd import SGD  # NOQA
  from chainer.optimizers.smorms3 import SMORMS3  # NOQA
  
new_contents: # import classes and functions
  from chainer.optimizers.ada_delta import AdaDelta  # NOQA
  from chainer.optimizers.ada_grad import AdaGrad  # NOQA
  from chainer.optimizers.adam import Adam  # NOQA
  from chainer.optimizers.momentum_sgd import MomentumSGD  # NOQA
  from chainer.optimizers.msvag import MSVAG  # NOQA
  from chainer.optimizers.nesterov_ag import NesterovAG  # NOQA
  from chainer.optimizers.rmsprop import RMSprop  # NOQA
  from chainer.optimizers.rmsprop_graves import RMSpropGraves  # NOQA
  from chainer.optimizers.sgd import SGD  # NOQA
  from chainer.optimizers.smorms3 import SMORMS3  # NOQA
  
subject: Update __init__.py