ImportError: No module named sklearn.cross_validation

J'utilise python 2.7 sous Ubuntu 14.04. J'ai installé scikit-learn, numpy et matplotlib avec ces commandes:

sudo apt-get install build-essential python-dev python-numpy \
python-numpy-dev python-scipy libatlas-dev g++ python-matplotlib \
ipython

Mais quand je l'importation de ces paquets:

from time import time
import logging
import matplotlib.pyplot as plt

from sklearn.cross_validation import train_test_split
from sklearn.datasets import fetch_lfw_people
from sklearn.grid_search import GridSearchCV
from sklearn.metrics import classification_report
from sklearn.metrics import confusion_matrix
from sklearn.decomposition import RandomizedPCA
from sklearn.svm import SVC

Il me renvoie cette erreur:

ImportError: No module named sklearn.cross_validation

Ce que je dois faire?

OriginalL'auteur arthurckl | 2015-06-05