def test_metrics_colduser_mask(U: int, I: int, U_test: int) -> None:
rns = np.random.RandomState(42)
X_gt = (rns.rand(U, I) >= 0.5).astype(np.float64)
X_gt = X_gt[(X_gt.sum(axis=1) > 0)]
X_gt = sps.csr_matrix(X_gt)
rec = TopPopRecommender(X_gt).learn()
vicious_eval = EvaluatorWithColdUser(X_gt, X_gt, cutoff=1)
vicious_metric = vicious_eval.get_score(rec)
assert vicious_metric["hit"] == 0.0
popularity = rec.get_score_cold_user(X_gt[:1, :]).ravel()
most_pop_indices = np.where(popularity.max() == popularity)[0]
X_gt_pop = np.zeros(X_gt.shape)
X_gt_pop[:, most_pop_indices] = 1
X_gt_pop = sps.csr_matrix(X_gt_pop)
generous_eval = EvaluatorWithColdUser(
X_gt_pop,
X_gt_pop,
cutoff=1,
masked_interactions=sps.csr_matrix(X_gt.shape),
recall_with_cutoff=True,
)
generous_metric = generous_eval.get_score(rec)
assert generous_metric["recall"] == 1.0
pickle_content = BytesIO()
pickle.dump(generous_eval, pickle_content)
pickle_content.seek(0)
generous_eval_pickled = pickle.load(pickle_content)
assert generous_eval_pickled.get_score(rec)["recall"] == 1.0
def test_metrics_ColdUser(U: int, I: int, U_test: int) -> None:
rns = np.random.RandomState(42)
uvec = rns.randn(U + U_test, 3)
ivec = rns.randn(I, 3)
true_score = uvec.dot(ivec.T) # + rns.randn(U, I)
X = sps.csr_matrix((true_score > 0).astype(np.float64))
X_train = X[:U]
X_val = X[U:]
X_val_learn, X_val_target = rowwise_train_test_split(X_val, random_seed=0)
X_train_all = sps.vstack([X_train, X_val_learn])
hot_evaluator = Evaluator(
sps.csr_matrix(X_val_target), offset=U, cutoff=I // 2, n_threads=2
)
rec = P3alphaRecommender(X_train_all)
rec.learn()
hot_score = hot_evaluator.get_score(rec)
with pytest.warns(UserWarning):
cold_evaluator = EvaluatorWithColdUser(
X_val_learn.tocsc(), X_val_target, cutoff=I // 2, mb_size=5
) # csc matrix input should raise warning about
# memory ordering, as csc-csc matrix product will be csc,
# hence col-major matrix when made dense.
cold_score = cold_evaluator.get_score(rec)
shuffle_index = np.arange(X_val_learn.shape[0])
rns.shuffle(shuffle_index)
cold_evaluator_shuffled = EvaluatorWithColdUser(
X_val_learn[shuffle_index], X_val_target[shuffle_index], cutoff=I // 2
)
cold_score_shuffled = cold_evaluator_shuffled.get_score(rec)
for key in cold_score:
assert cold_score_shuffled[key] == pytest.approx(cold_score[key])
for key in hot_score:
assert hot_score[key] == pytest.approx(cold_score[key], abs=1e-8)