class_docstr: Propensity Stratified Result Class for a single model
  
  Parameters
  ----------
  model_name: string, required
      The name of the recommender model.
code: def __str__(self):
      return "[{}]\n{}".format(self.model_name, self.table)
  
imports: import numpy
  from collections import OrderedDict
label_desc: Use image node_id 2 for calling the PSTResult obj's underlying member method code with example usage: obj.__str__() and returns: str