old_contents: from __future__ import absolute_import, division, print_function
  
  from .core import istask
  from .context import set_options
  from .async import get_sync as get
  try:
      from .imperative import do, value
  except ImportError:
      pass
  
  __version__ = '0.7.3'
  
new_contents: from __future__ import absolute_import, division, print_function
  
  from .core import istask
  from .context import set_options
  from .async import get_sync as get
  try:
      from .imperative import do, value
  except ImportError:
      pass
  try:
      from .base import visualize, compute
  except ImportError:
      pass
  
  __version__ = '0.7.3'
  
subject: add visualize and base to __init__