text: import numpy as np
  import os, json, math
  
  
  def save_json(file, data):
      with open(file, 'w') as outfile:
          json.dump(data, outfile)
  
  def read_json(file):
      with open(file) as data_file:
          data = json.load(data_file)
      return data
  
  def get_precentiles_str(a):
      p25, p50, p75 = get_precentiles(a)
      p25 = "%0.2f"%p25
      p50 = "%0.2f"%p50
      p75 = "%0.2f"%p75
      return p25, p50, p75
  
  def get_precentiles_in_seconds(a):
      p25, p50, p75 = reward2steps(get_precentiles(a))
      p25 = ("%0.2f"%(p25/10) if p25 > 0 else "----")
      p50 = ("%0.2f"%(p50/10) if p50 > 0 else "----")
      p75 = ("%0.2f"%(p75/10) if p75 > 0 else "----")
      return p25, p50, p75
  
  def get_precentiles(a):
      p25 = float(np.percentile(a, 25))
      p50 = float(np.percentile(a, 50))
      p75 = float(np.percentile(a, 75))
      return p25, p50, p75
  
  def reward2steps(rewards):
      ret = []
      for r in rewards:    
          if r > 0: r = round(math.log(r, 0.9))
          else: r = -1
          ret.append(r+1)
      return tuple(ret)
  
  