class_docstr: Implement the linear annealing policy
  
  Linear Annealing Policy computes a current threshold value and
  transfers it to an inner policy which chooses the action. The threshold
  value is following a linear function decreasing over time.
class_docstr_tok: ["Implement","the","linear","annealing","policy","Linear","Annealing","Policy","computes","a","current","threshold","value","and","transfers","it","to","an","inner","policy","which","chooses","the","action",".","The","threshold","value","is","following","a","linear","function","decreasing","over","time","."]
docstr: Return names of metrics
  
  # Returns
      List of metric names
code: def metrics_names(self):
      """Return names of metrics
  
      # Returns
          List of metric names
      """
      return ["mean_{}".format(self.attr)]
  
imports: from __future__ import division
  import numpy
  from rl.util import *
label_desc: Use image node_id 4 for calling the LinearAnnealedPolicy obj's underlying member method code with example usage: obj.metrics_names() and returns: list