Cosmit pep8

examples/applications/face_recognition.py

examples/applications/plot_outlier_detection_housing.py

examples/applications/plot_stock_market.py

examples/applications/svm_gui.py

examples/cluster/plot_affinity_propagation.py

examples/cluster/plot_cluster_iris.py

examples/cluster/plot_digits_agglomeration.py

examples/cluster/plot_kmeans_digits.py

examples/cluster/plot_lena_segmentation.py

examples/cluster/plot_lena_ward_segmentation.py

examples/cluster/plot_mean_shift.py

examples/cluster/plot_mini_batch_kmeans.py

examples/covariance/plot_covariance_estimation.py

examples/covariance/plot_mahalanobis_distances.py

examples/covariance/plot_outlier_detection.py

examples/covariance/plot_robust_vs_empirical_covariance.py

examples/datasets/plot_random_dataset.py

examples/decomposition/plot_faces_decomposition.py

examples/decomposition/plot_ica_vs_pca.py

examples/decomposition/plot_image_denoising.py