[scikit-learn] Regarding negative value of sklearn.metrics.r2_score and sklearn.metrics.explained_variance_score

[Samir K Mahajan]

Dear All,
I am amazed to find  negative  values of  sklearn.metrics.r2_score and
sklearn.metrics.explained_variance_score in a model ( cross validation of
OLS regression model)
However, what amuses me more  is seeing you justifying   negative
'sklearn.metrics.r2_score ' in your documentation.  This does not
make sense to me . Please justify to me how squared values are negative.

Regards,
Samir K Mahajan.
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