old_contents: from __future__ import print_function, absolute_import, division
  
  from mousestyles import data
  from .path_index import path_index
  from .filter_path import filter_paths
  from .get_dist_speed import get_dist_speed
  
new_contents: from __future__ import print_function, absolute_import, division
  
  from mousestyles import data
  from .path_index import path_index
  from .filter_path import filter_paths
  from .get_dist_speed import get_dist_speed
  from .path_features import (compute_accelerations, compute_angles,
                              angle_between)
  from .clean_movements import clean_movements
  
subject: add function in path_features.py and clean_movements.py to __init__