Update dataset_loader.py

petit problème de nommage

code/bolsonaro/data/dataset_loader.py

-from bolsonaro.data import Dataset
-from bolsonaro.data import Task
+from bolsonaro.data.dataset import Dataset
+from bolsonaro.data.task import Task
 
 from sklearn.datasets import load_boston, load_iris, load_diabetes, load_digits, load_linnerud, load_wine, load_breast_cancer
 from sklearn.datasets import fetch_olivetti_faces, fetch_20newsgroups, \