[scikit-learn] Model trained in 0.17 gives entirely different results in 0.15

[Andreas Mueller]

Hi Shi.
In general, there is no guarantee that models built with one version 
will work in a different version.
In particular, loading in an older version when built in a newer version 
seems something that's tricky to achieve.

We might want to warn the user when doing this. The docs are not very 
explicit about this.

Opened an issue:
https://github.com/scikit-learn/scikit-learn/issues/7135

Andy

On 08/02/2016 05:02 PM, Shi Yu wrote:
> Hello,
>
> We trained SVM models in scikit-learn 0.17 and saved it as pickle 
> files. When loading the models back in a lower version of scikit-learn 
> 0.15, the outputs are entirely different. Basically for binary 
> classification problem, for the same test data,  it swapped the 
> probabilities and gave an opposite prediction.  In 0.17 the 
> probability is [0.02668825,  0.97331175] and the prediction is 1.  In 
> 0.15 the probability is [0.97331175, 0.02668825] and the prediction is 0.
>
> I wonder is anyone seeing the same issue, or it has been notified.  I 
> could provide more details for error replication if required.
>
> Best,
>
> Shi
>
>
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