Simple: despite its name R2 is not a square. Look up its definition.

On Wed, 11 Aug 2021, 21:17 Samir K Mahajan, <samirkmahajan1972@gmail.com> wrote:
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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