old_contents: from chainercv import datasets  # NOQA
  from chainercv import extensions  # NOQA
  from chainercv import functions  # NOQA
  from chainercv import links  # NOQA
  from chainercv import transforms  # NOQA
  from chainercv import utils  # NOQA
  
new_contents: from chainercv import datasets  # NOQA
  from chainercv import evaluations  # NOQA
  from chainercv import extensions  # NOQA
  from chainercv import functions  # NOQA
  from chainercv import links  # NOQA
  from chainercv import transforms  # NOQA
  from chainercv import utils  # NOQA
  
subject: add missing import for evaluations in __init__