The bug is in SVC.decision_function.
import numpy as np
from sklearn.multiclass import OneVsRestClassifier
from sklearn.svm import SVC
rng = np.random.RandomState([1,2,3])
X = rng.randn(1000,1000)
y = rng.randint(0,10,(1000,))
svm = SVC(kernel = 'linear', C = 1.0).fit(X,y)
X2 = rng.randn(1000,1500)
print svm.decision_function(X2).shape
Mathieu
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