old_contents: from .base_regression import (ModelRegression as Model,
                                LearnerRegression as Learner,
                                SklModelRegression as SklModel,
                                SklLearnerRegression as SklLearner)
  from .linear import *
  from .mean import *
  from .knn import *
  from .simple_random_forest import *
  from .svm import *
  from .random_forest import *
  from .tree import *
  
new_contents: from .base_regression import (ModelRegression as Model,
                                LearnerRegression as Learner,
                                SklModelRegression as SklModel,
                                SklLearnerRegression as SklLearner)
  from .linear import *
  from .mean import *
  from .knn import *
  from .simple_random_forest import *
  from .svm import *
  from .random_forest import *
  from .tree import *
  from Orange.classification.simple_tree import *
subject: Include simple tree in regression package