text: """Various utility and helper functions.
  
  .. autosummary::
      :toctree: _api
  
      base
      geometry
      convolution
      deprecation
      optimize
      parallel
  
  """
  from .base import PrettyPrint, FreezeError, Frozen, Data, gamma, unique
  from .geometry import (Grid2D, RetinalCoordTransform, Curcio1990Transform,
                         Watson2014Transform, Watson2014DisplaceTransform,
                         cart2pol, pol2cart, delta_angle)
  from .convolution import center_vector, conv
  from .deprecation import deprecated
  from .optimize import bisect
  from .parallel import parfor
  
  __all__ = [
      'bisect',
      'cart2pol',
      'Curcio1990Transform',
      'Data',
      'delta_angle',
      'deprecated',
      'FreezeError',
      'Frozen',
      'gamma',
      'Grid2D',
      'parfor',
      'pol2cart',
      'PrettyPrint',
      'RetinalCoordTransform',
      'unique',
      'Watson2014DisplaceTransform',
      'Watson2014Transform'
  ]
  