text: """
  A backend which uses NumPy to perform the filtering. This backend should always
  be available.
  
  """
  
  from .common import Pyramid
  from .transform1d import Transform1d
  from .transform2d import Transform2d
  from .transform3d import Transform3d
  
  __all__ = [
      'Pyramid',
      'Transform1d',
      'Transform2d',
      'Transform3d',
  ]
  