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from sklearn.preprocessing import RobustScaler
from sklearn.feature_selection import RFECV, RFE
from sklearn.cross_validation import StratifiedKFold, cross_val_score
from sklearn.decomposition import KernelPCA
from sklearn.grid_search import GridSearchCV
from sklearn.ensemble import RandomForestClassifier, AdaBoostClassifier, GradientBoostingClassifier, VotingClassifier
from sklearn.linear_model import LogisticRegression
from sklearn.neighbors import KNeighborsClassifier
from sklearn.naive_bayes import GaussianNB
from sklearn.svm import SVC
from sklearn.pipeline import Pipeline
from sklearn.metrics import confusion_matrix, roc_auc_score, roc_curve, f1_score