def test_user_level_split_val_fixed_n() -> None:
ratio = 0.3
dataset, mid_list = split_dataframe_partial_user_holdout(
df,
user_column="userId",
item_column="movieId",
n_test_user=30,
n_val_user=30,
n_heldout_val=1,
heldout_ratio_test=ratio,
)
assert len(mid_list) == len(set(df.movieId))
train = dataset["train"]
train_invalid = UserTrainTestInteractionPair(
train.user_ids, train.X_train[:, :-1], None
)
with pytest.raises(ValueError):
train_invalid.concat(train)
with pytest.raises(ValueError):
_ = UserTrainTestInteractionPair(
train.user_ids, train.X_train, train.X_train[1:]
)
val = dataset["val"]
test = dataset["test"]
assert train.X_test.count_nonzero() == 0
train_val = train.concat(val)
assert train_val.X_test[: train.n_users].count_nonzero() == 0
assert (train_val.X_test[train.n_users :] - val.X_test).count_nonzero() == 0
assert (
train_val.X_train - sps.vstack([train.X_all, val.X_train])
).count_nonzero() == 0
val_X_test = val.X_test
assert np.all(val_X_test.sum(axis=1).A1 <= 1)
X_learn = test.X_train
X_predict = test.X_test
assert X_predict is not None
intersect = X_learn.multiply(X_predict)
assert intersect.count_nonzero() == 0
index = RNS.choice(np.arange(test.n_users), size=10)
for i in index:
nnz_learn = X_learn[i].nonzero()[1].shape[0]
nnz_predict = X_predict[i].nonzero()[1].shape[0]
assert ratio >= (nnz_predict - 1) / (nnz_learn + nnz_predict)
assert ratio <= (nnz_predict + 1) / (nnz_learn + nnz_predict)
def test_extreme_case() -> None:
ratio = 0.3
dataset, mid_list = split_dataframe_partial_user_holdout(
df,
user_column="userId",
item_column="movieId",
n_heldout_val=1,
val_user_ratio=1.0,
test_user_ratio=0,
heldout_ratio_test=ratio,
)
assert len(mid_list) == len(set(df.movieId))
assert dataset["train"].n_users == 0
assert dataset["test"].n_users == 0
assert dataset["val"].n_users == len(set(df.userId))
assert dataset["val"].X_all.nnz == df.shape[0]
def test_user_level_split() -> None:
dataset, mid_list = split_dataframe_partial_user_holdout(
df,
user_column="userId",
item_column="movieId",
n_test_user=30,
n_val_user=30,
heldout_ratio_val=0.3,
heldout_ratio_test=0.5,
)
train = dataset["train"]
train_invalid = UserTrainTestInteractionPair(train.user_ids,
train.X_train[:, :-1], None)
with pytest.raises(ValueError):
train_invalid.concat(train)
with pytest.raises(ValueError):
invalid_arg = UserTrainTestInteractionPair(train.user_ids,
train.X_train,
train.X_train[1:])
val = dataset["val"]
test = dataset["test"]
assert train.X_test.count_nonzero() == 0
train_val = train.concat(val)
assert train_val.X_test[:train.n_users].count_nonzero() == 0
assert (train_val.X_test[train.n_users:] - val.X_test).count_nonzero() == 0
assert (train_val.X_train -
sps.vstack([train.X_all, val.X_train])).count_nonzero() == 0
for user_data, ratio in [(val, 0.3), (test, 0.5)]:
X_learn = user_data.X_train
X_predict = user_data.X_test
assert X_predict is not None
intersect = X_learn.multiply(X_predict)
assert intersect.count_nonzero() == 0
index = RNS.choice(np.arange(user_data.n_users), size=10)
for i in index:
nnz_learn = X_learn[i].nonzero()[1].shape[0]
nnz_predict = X_predict[i].nonzero()[1].shape[0]
assert ratio >= (nnz_predict - 1) / (nnz_learn + nnz_predict)
assert ratio <= (nnz_predict + 1) / (nnz_learn + nnz_predict)
os.environ["OMP_NUM_THREADS"] = "8"
os.environ["IRSPACK_NUM_THREADS_DEFAULT"] = "8"
if __name__ == "__main__":
BASE_CUTOFF = 20
data_manager = MovieLens1MDataManager()
df_all = data_manager.read_interaction()
data_all, _ = split_dataframe_partial_user_holdout(
df_all,
"userId",
"movieId",
test_user_ratio=0.2,
val_user_ratio=0.2,
heldout_ratio_test=0.5,
heldout_ratio_val=0.5,
)
data_train = data_all["train"]
data_val = data_all["val"]
data_test = data_all["test"]
X_train_all: sps.csr_matrix = sps.vstack(
[data_train.X_train, data_val.X_train, data_test.X_train],
format="csr")
X_train_val_all: sps.csr_matrix = sps.vstack(
[data_train.X_all, data_val.X_all, data_test.X_train], format="csr")
valid_evaluator = Evaluator(
BASE_CUTOFF = 100
# We follow the preprocessing of Mult-VAE implementation (https://github.com/dawenl/vae_cf)
data_manager = MovieLens20MDataManager()
df_all = data_manager.read_interaction()
df_all = df_all[df_all.rating >= 4]
user_cnt = df_all.userId.value_counts()
user_cnt = user_cnt[user_cnt >= 5]
df_all = df_all[df_all.userId.isin(user_cnt.index)]
data_all, _ = split_dataframe_partial_user_holdout(
df_all,
"userId",
"movieId",
n_test_user=10000,
n_val_user=10000,
heldout_ratio_val=0.2,
heldout_ratio_test=0.2,
)
data_train = data_all["train"]
data_val = data_all["val"]
data_test = data_all["test"]
X_train_val_all: sps.csr_matrix = sps.vstack(
[data_train.X_all, data_val.X_all], format="csr")
valid_evaluator = EvaluatorWithColdUser(
input_interaction=data_val.X_train,
ground_truth=data_val.X_test,
cutoff=BASE_CUTOFF,
def test_user_level_split(
n_val_user: Optional[int],
n_test_user: Optional[int],
val_user_ratio: float,
test_user_ratio: float,
time_colname: Optional[str],
) -> None:
n_users_all = len(set(df.userId))
dataset, mid_list = split_dataframe_partial_user_holdout(
df,
user_column="userId",
item_column="movieId",
time_column=time_colname,
val_user_ratio=val_user_ratio,
test_user_ratio=test_user_ratio,
n_val_user=n_val_user,
n_test_user=n_test_user,
heldout_ratio_val=0.3,
heldout_ratio_test=0.5,
)
assert len(mid_list) == len(set(df.movieId))
train = dataset["train"]
train_invalid = UserTrainTestInteractionPair(train.user_ids,
train.X_train[:, :-1], None)
with pytest.raises(ValueError):
train_invalid.concat(train)
with pytest.raises(ValueError):
_ = UserTrainTestInteractionPair(train.user_ids, train.X_train,
train.X_train[1:])
with pytest.raises(ValueError):
_ = UserTrainTestInteractionPair(train.user_ids, train.X_train,
train.X_train, mid_list[:-1])
def get_n_right_answer(ratio: float, n: Optional[int]) -> int:
if n is not None:
return n
else:
return int(n_users_all * ratio)
val = dataset["val"]
assert val.n_users == get_n_right_answer(val_user_ratio, n_val_user)
test = dataset["test"]
assert test.n_users == get_n_right_answer(test_user_ratio, n_test_user)
if time_colname is not None:
for d in [val, test]:
_df_train = d.df_train().merge(
df[["userId", "movieId",
"timestamp"]].rename(columns={
"userId": "user_id",
"movieId": "item_id"
}))
_df_test = d.df_test().merge(
df[["userId", "movieId",
"timestamp"]].rename(columns={
"userId": "user_id",
"movieId": "item_id"
}))
_train_max_time = _df_train.groupby("user_id").timestamp.max()
_test_min_time = _df_test.groupby("user_id").timestamp.min()
common_index = np.intersect1d(_train_max_time.index,
_test_min_time.index)
assert common_index.shape[0] > 0
assert np.all(
_train_max_time.reindex(common_index) <=
_test_min_time.reindex(common_index))
assert train.X_test.count_nonzero() == 0
train_val = train.concat(val)
assert train_val.X_test[:train.n_users].count_nonzero() == 0
assert (train_val.X_test[train.n_users:] - val.X_test).count_nonzero() == 0
assert (train_val.X_train -
sps.vstack([train.X_all, val.X_train])).count_nonzero() == 0
for user_data, ratio in [(val, 0.3), (test, 0.5)]:
X_learn = user_data.X_train
X_predict = user_data.X_test
assert X_predict is not None
intersect = X_learn.multiply(X_predict)
assert intersect.count_nonzero() == 0
index = RNS.choice(np.arange(user_data.n_users), size=10)
for i in index:
nnz_learn = X_learn[i].nonzero()[1].shape[0]
nnz_predict = X_predict[i].nonzero()[1].shape[0]
assert ratio >= (nnz_predict - 1) / (nnz_learn + nnz_predict)
assert ratio <= (nnz_predict + 1) / (nnz_learn + nnz_predict)
