old_contents: from .find_contours import find_contours
  from ._regionprops import regionprops, perimeter
  from ._structural_similarity import structural_similarity
  from ._polygon import approximate_polygon, subdivide_polygon
  
  __all__ = ['find_contours',
             'regionprops',
             'perimeter',
             'structural_similarity',
             'approximate_polygon',
             'subdivide_polygon']
  
new_contents: from .find_contours import find_contours
  from ._regionprops import regionprops, perimeter
  from ._structural_similarity import structural_similarity
  from ._polygon import approximate_polygon, subdivide_polygon
  from .fit import LineModel, CircleModel, EllipseModel, ransac
  
  
  __all__ = ['find_contours',
             'regionprops',
             'perimeter',
             'structural_similarity',
             'approximate_polygon',
             'subdivide_polygon',
             'LineModel',
             'CircleModel',
             'EllipseModel',
             'ransac']
  
subject: Add imports of fit to subpackage