In [28]: clf.decision_function(X)
> Out[28]:
> *array([[-0.63212056, -0.98168436, -0.3495638 ],*
> * [ 0.63212056, -0. , -0.63212056],*
> * [ 0.3495638 , 0.98168436, 0.63212056]])*
>
Because SVC uses one-vs-one, for multiclass classification. The 3 three
columns you see correspond to:
>>> for i in xrange(3):
... for j in xrange(i + 1, 3):
... print i, "vs", j
...
0 vs 1
0 vs 2
1 vs 2
Cheers,
Mathieu
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