Roberto, I am not sure if this causes problems regarding the implementation, 
but in any case, I'd recommend you to use the LabelEncoder to have your classes 
mapped to a fixed range, e.g., 0, 1, 2, 3, 4, 5. And having different class 
labels in training and test set that reference to the same class is not good 
practice and could cause all kinds of problems. I just wouldn't risk it even it 
it works.

> On Apr 30, 2015, at 11:02 PM, Pagliari, Roberto <rpagli...@appcomsci.com> 
> wrote:
> 
> Suppose I train a classifier with dataset1, which contains labels
> 
> 0
> 3
> 4
> 6
> 7
> 
> and then predict over dataset2 with labels
> 
> 0
> 3
> 4
> 8
> 10
> 
> will the hashing be the same for labels 0, 3 and 4? and will scikit learn get 
> confused by seeing new labels such as 8 and 10?
> 
> Thank you, 
> 
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