def test_rank_single_representation(self, classifier: Classifier): clf = classifier # Single representation alg = ClassifierRecommender({'Plot': ['tfidf']}, clf, threshold=0) user_ratings = self.ratings.query('from_id == "A000"') alg.process_rated(user_ratings, self.movies_dir) alg.fit() # rank with filter_list res_filtered = alg.rank(user_ratings, self.movies_dir, filter_list=self.filter_list) item_ranked_set = set(res_filtered['to_id']) self.assertEqual(len(item_ranked_set), len(self.filter_list)) self.assertCountEqual(item_ranked_set, self.filter_list) # rank without filter_list res_all_unrated = alg.rank(user_ratings, self.movies_dir) item_rated_set = set(user_ratings['to_id']) item_ranked_set = set(res_all_unrated['to_id']) # We expect this to be empty, since the alg should rank only unrated items (unless in filter list) rated_in_ranked = item_ranked_set.intersection(item_rated_set) self.assertEqual(len(rated_in_ranked), 0) # rank with n_recs specified n_recs = 5 res_n_recs = alg.rank(user_ratings, self.movies_dir, n_recs) self.assertEqual(len(res_n_recs), n_recs) item_rated_set = set(user_ratings['to_id']) item_ranked_set = set(res_n_recs['to_id']) # We expect this to be empty, since the alg should rank only unrated items (unless in filter list) rated_in_ranked = item_ranked_set.intersection(item_rated_set) self.assertEqual(len(rated_in_ranked), 0)
def test_empty_frame(self): ratings_only_positive = pd.DataFrame.from_records( [("A000", "tt0114576", 5, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) ratings_only_negative = pd.DataFrame.from_records( [("A000", "tt0114576", 1, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) ratings_item_inexistent = pd.DataFrame.from_records( [("A000", "not exists", 1, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) # ClassifierRecommender returns an empty frame alg = ClassifierRecommender({'Plot': ['tfidf', 'embedding']}, SkSVC(), threshold=3) rs = ContentBasedRS(alg, ratings_only_positive, self.movies_multiple) result = rs.fit_rank('A000') self.assertTrue(result.empty) alg = ClassifierRecommender({'Plot': ['tfidf', 'embedding']}, SkSVC(), threshold=3) rs = ContentBasedRS(alg, ratings_only_negative, self.movies_multiple) result = rs.fit_rank('A000') self.assertTrue(result.empty) alg = ClassifierRecommender({'Plot': ['tfidf', 'embedding']}, SkSVC(), threshold=3) rs = ContentBasedRS(alg, ratings_item_inexistent, self.movies_multiple) result = rs.fit_rank('A000') self.assertTrue(result.empty) # CentroidVector returns an empty frame alg = CentroidVector({'Plot': ['tfidf', 'embedding']}, CosineSimilarity(), threshold=3) rs = ContentBasedRS(alg, ratings_only_negative, self.movies_multiple) result = rs.fit_rank('A000') self.assertTrue(result.empty) alg = CentroidVector({'Plot': ['tfidf', 'embedding']}, CosineSimilarity(), threshold=3) rs = ContentBasedRS(alg, ratings_item_inexistent, self.movies_multiple) result = rs.fit_rank('A000') self.assertTrue(result.empty)
def test_predict(self): # Doesn't matter which classifier we chose alg = ClassifierRecommender({'Plot': ['tfidf']}, SkSVC(), threshold=0) user_ratings = self.ratings.query('from_id == "A000"') alg.process_rated(user_ratings, self.movies_dir) alg.fit() # Will raise Exception since it's not a Score Prediction Algorithm with self.assertRaises(NotPredictionAlg): alg.predict(user_ratings, self.movies_dir)
def test_classifier_recommender(self): recs_number = 3 # Test prediction and ranking with the Classifier Recommender algorithm alg = ClassifierRecommender({'Plot': ['tfidf', 'embedding']}, SkSVC()) rs = ContentBasedRS(alg, ratings, self.movies_multiple) # Prediction should raise error since it's not a ScorePredictionAlg with self.assertRaises(NotPredictionAlg): rs.fit_predict('A000') # Test ranking with the Classifier Recommender algorithm on specified items result_rank_filtered = rs.fit_rank('A000', filter_list=self.filter_list) self.assertEqual(len(result_rank_filtered), len(self.filter_list)) # Test top-n ranking with the Classifier Recommender algorithm result_rank_numbered = rs.fit_rank('A000', recs_number=recs_number) self.assertEqual(len(result_rank_numbered), recs_number)
def test_raise_errors(self): # Only positive available self.ratings = pd.DataFrame.from_records( [("A000", "tt0112281", 1, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) alg = ClassifierRecommender({'Plot': 'tfidf'}, SkKNN(), 0) user_ratings = self.ratings.query('from_id == "A000"') with self.assertRaises(OnlyPositiveItems): alg.process_rated(user_ratings, self.movies_dir) # Only negative available self.ratings = pd.DataFrame.from_records( [("A000", "tt0112281", -1, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) alg = ClassifierRecommender({'Plot': 'tfidf'}, SkKNN(), 0) user_ratings = self.ratings.query('from_id == "A000"') with self.assertRaises(OnlyNegativeItems): alg.process_rated(user_ratings, self.movies_dir) # No Item avilable locally self.ratings = pd.DataFrame.from_records( [("A000", "non existent", 0.5, "54654675")], columns=["from_id", "to_id", "score", "timestamp"]) alg = ClassifierRecommender({'Plot': 'tfidf'}, SkKNN(), 0) user_ratings = self.ratings.query('from_id == "A000"') with self.assertRaises(NoRatedItems): alg.process_rated(user_ratings, self.movies_dir)