2)| first normalizes the symtensor.
% It then attempts to match the symktensor $R1$ to $R2$ and returns the 
% following numeric quantification of their similarity.
%
% $$\frac{1 - ||\lambda_{R1}-\lambda_{R2}||}{\max(\lambda_{R1}, \lambda_{R2})} \prod_{i=1}^{r} X_{i}' Y_{i}$$
%
% In the above formula, $r$ is the number of components of $R1$. $R1$ must
% have at least as many components as $R2$. Any additional components are
% ignored in the score calculation. Since the formula for score depends on
% the arr