code: def is_positive(self, user_id, item_id):
      if (
          user_id in self._index_store["positive"]
          and item_id in self._index_store["positive"][user_id]
      ):
          return True
      return False
  
file_path: openrec/openrec/tf1/utils/dataset.py
imports: import numpy
  import random
label_desc: Use image node_id 3 for calling the Dataset obj's underlying member method code with example usage: obj.is_positive(user_id, item_id) and returns: False, True