code: def test_fit(self):
      dataset = BasketDataset.from_ubi(self.data)
      model = NextBasketRecommender("")
      model.fit(dataset)
      model = GPTop()
      model.fit(dataset)
      model.score(0, [[]])
      model.rank(0, history_baskets=[[]])
  
file_path: cornac/tests/cornac/models/test_recommender.py
imports: import unittest
  from cornac.data import BasketDataset, Dataset, SequentialDataset, Reader
  from cornac.models import MF, GPTop, SPop, NextBasketRecommender, NextItemRecommender
label_desc: Use image node_id 3 for calling the TestNextBasketRecommender obj's underlying member method code with example usage: obj.test_fit() without return types