code: def sample_negative_items(self, user_id, num_samples=1):
      if "negative_sets" in self._index_store:
          if user_id in self._index_store["negative_sets"]:
              return random.sample(
                  self._index_store["negative_sets"][user_id],
                  num_samples,
              )
          else:
              return []
      else:
          sample_id = random.randint(0, self._total_items - 1)
          sample_set = set()
          while len(sample_set) < num_samples:
              if (
                  user_id not in self._index_store["positive_sets"]
                  or sample_id
                  not in self._index_store["positive_sets"][user_id]
              ):
                  sample_set.add(sample_id)
              sample_id = random.randint(0, self._total_items - 1)
          return list(sample_set)
  
file_path: openrec/openrec/tf1/utils/dataset.py
imports: import numpy
  import random
label_desc: Use image node_id 5 for calling the Dataset obj's underlying member method code with example usage: obj.sample_negative_items(user_id, num_samples) and returns: list, random, list