def test_score_for_python_version(self): tf = PyTensorCoFi(n_factors=2) inp = [{"user": 10, "item": 100}, {"user": 10, "item": 110}, {"user": 12, "item": 120}] inp = pd.DataFrame(inp) tf.fit(inp) uid = tf.data_map[tf.get_user_column()][10] iid = tf.data_map[tf.get_item_column()][100] tf.factors[0][uid, 0] = 0 tf.factors[0][uid, 1] = 1 tf.factors[1][iid, 0] = 1 tf.factors[1][iid, 1] = 5 self.assertEqual(0*1+1*5, tf.get_score(10, 100))
def test_score_for_python_version(self): tf = PyTensorCoFi(n_factors=2) inp = [{ "user": 10, "item": 100 }, { "user": 10, "item": 110 }, { "user": 12, "item": 120 }] inp = pd.DataFrame(inp) tf.fit(inp) uid = tf.data_map[tf.get_user_column()][10] iid = tf.data_map[tf.get_item_column()][100] tf.factors[0][uid, 0] = 0 tf.factors[0][uid, 1] = 1 tf.factors[1][iid, 0] = 1 tf.factors[1][iid, 1] = 5 self.assertEqual(0 * 1 + 1 * 5, tf.get_score(10, 100))
def test_recommendation_with_testfm(self): """ [recommendation.api.GetRecommendation] Test recommendation with testfm """ data = np.array(zip(*map(lambda x: (x["user_id"]-1, x["item_id"]-1, 1.), Inventory.objects.all().values("user_id", "item_id"))), dtype=np.float32) users, items = zip(*Inventory.objects.all().values_list("user_id", "item_id")) df = pd.DataFrame({"user": pd.Series(users), "item": pd.Series(items)}, dtype=np.float32) evaluator = Evaluator(use_multi_threading=False) tensor = TensorCoFi.get_model_from_cache() tfm_tensor = PyTensorCoFi() tfm_tensor.data_map = tensor.data_map tfm_tensor.users_size = lambda: tensor.users_size() tfm_tensor.items_size = lambda: tensor.items_size() tfm_tensor.get_score = lambda user, item: \ np.dot(tfm_tensor.factors[0][tfm_tensor.data_map[tfm_tensor.get_user_column()][user]], tfm_tensor.factors[1][tfm_tensor.data_map[tfm_tensor.get_item_column()][item]].transpose()) tfm_tensor.train(data.transpose()) items = df.item.unique() t = evaluator.evaluate_model(tensor, df, all_items=items, non_relevant_count=100) tfm = evaluator.evaluate_model(tfm_tensor, df, all_items=items, non_relevant_count=100) assert abs(t[0] - tfm[0]) < 0.15, \ "Difference between testfm implementation and frappe is to high (%f, %f)" % (t[0], tfm[0])