Fix styles

tests/test_pipelines.py

@@ -15,6 +15,7 @@
 from sklearn.model_selection import train_test_split
 from sklearn.tree import DecisionTreeClassifier, DecisionTreeRegressor
 from sklearn.utils import resample
+
 from vflow import Vset, build_vset, dict_to_df, init_args
 from vflow.subkey import Subkey as sm
 from vflow.vset import PREV_KEY