old_contents: from .black_box_optimization import RWR, PGPE, REPS
  from .enac import eNAC
  from .gpomdp import GPOMDP
  from .policy_gradient import PolicyGradient
  from .reinforce import REINFORCE
  
  
  __all__ = ['PolicyGradient', 'REINFORCE', 'GPOMDP', 'eNAC', 'RWR', 'PGPE',
             'REPS']
  
new_contents: from .policy_gradient import PolicyGradient
  from .reinforce import REINFORCE
  from .enac import eNAC
  from .gpomdp import GPOMDP
  from .black_box_optimization import RWR, PGPE, REPS
  
  
  __all__ = ['PolicyGradient', 'REINFORCE', 'GPOMDP', 'eNAC', 'RWR', 'PGPE',
             'REPS']
  
subject: fix in policy_search init