YEP! 
That’s reasonable, 
Thank you, Subutai.

Cyan

> 在 2015年9月30日,上午5:24,Subutai Ahmad <[email protected]> 写道:
> 
> 
> Yes you could use a threshold for this. It is classifier specific - in this 
> case we're using the KNN classifier, so you could perhaps use a distance 
> threshold to place something into unknown.
> 
> Also, sometimes the right answer is not clear. If the number 6 is 
> misclassified as 0, is that wrong? After all 6 is something that is like zero 
> plus some extra stuff added on.  It also sort-of resembles a 1.  
> 
> --Subutai
> 
> On Sat, Sep 26, 2015 at 8:48 PM, CyanM <[email protected] 
> <mailto:[email protected]>> wrote:
> Hello,Subutai
> Thank you for you answer, I get it.
> And these days, I test mnist_experiment, I got another question:
> For example: my train set only contain handwritten digit  ‘0’ and ‘1’, but 
> test set is ‘6', the classifier still classify the test image into ‘0’ or 
> ‘1’. 
> which means whatever the test image is, it will be classified into the train 
> set category? in other ward, the classifier will classify the test image to 
> the most similar category?  
> I think maybe there should be a threshold to control classifier to the 
> unknown category,  am I right?
> Thank you 
> Regard.
> 
> Cyan
> 

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