On Tue, Jul 8, 2014 at 11:27 PM, Sheila the angel <from.d.pu...@gmail.com>
wrote:
> First I scaled the complete data-set and then splitting it in test and
> train data.
>
You should not pre-process the data before splitting it. Just ask yourself
how you would use your model in practice. In a real-world setting, you
wouldn't have access to test data (unseen data) ahead of time. This will
also lead to overly optimistic accuracy results. You should use the usual
transformer API: fit_transform method to scale training data and transform
method to scale new data.
Mathieu
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