text: """
  This file implements an "empty" task and prior for test purposes.
  """
  
  from dso.task import HierarchicalTask
  from dso.library import Library
  from dso.functions import create_tokens
  from dso.prior import Prior
  
  
  class CustomTask(HierarchicalTask):
  
      task_type = "dummy"
  
      def __init__(self, param):
  
          super(HierarchicalTask).__init__()
  
          self.param = param
  
          # Create a Library
          tokens = create_tokens(n_input_var=1,
                                 function_set=["add", "sin"],
                                 protected=False,
                                 decision_tree_threshold_set=None)
          self.library = Library(tokens)
  
          self.stochastic = False
          self.name = "dummy"
  
      def reward_function(self, p):
          r = 0.
          return r
  
      def evaluate(self, p):
          info = {}
          return info
  
  
  class CustomPrior(Prior):
  
      def __init__(self, library, param):
          Prior.__init__(self, library)
          #Just check whether the prior parameter got lost for some reason
          assert param == "test"
  
      def __call__(self, actions, parent, sibling, dangling):
          # Initialize the prior
          prior = self.init_zeros(actions)
          return prior
  
      def validate(self):
          return None