Created
December 10, 2011 15:08
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cross validation
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from sklearn.datasets import load_svmlight_file | |
from sklearn.naive_bayes import MultinomialNB | |
from sklearn.svm.sparse import LinearSVC | |
from sklearn.cross_validation import StratifiedKFold | |
from sklearn import metrics | |
import numpy as np | |
X, y = load_svmlight_file("fr.vec") | |
y[y == -1] = 0 | |
kf = StratifiedKFold(y, k = 10, indices=True) | |
#clf = MultinomialNB() | |
clf = LinearSVC() | |
mean_li = [] | |
for train_index, test_index in kf: | |
X_train, X_test = X[train_index], X[test_index] | |
y_train, y_test = y[train_index], y[test_index] | |
clf.fit(X_train, y_train) | |
y_predicted = clf.predict(X_test) | |
print metrics.confusion_matrix(y_test, y_predicted) | |
print metrics.classification_report(y_test, y_predicted) | |
mean_li.append(sum(y_predicted == y_test) / float(len(y_test))) | |
print np.mean(mean_li) |
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