ng_ 
% optimization. The CP-OPT method is described in the
% following reference: 
%
% * E. Acar, D. M. Dunlavy and T. G. Kolda, *A Scalable
% Optimization Approach for Fitting Canonical Tensor Decompositions*,
% _J. Chemometrics_ 25(2):67-86, February 2011
% <http://doi.org/10.1002/cem.1335 (doi:10.1002/cem.1335)>


%% Third-party optimization software
% The |cp_opt| method uses third-party optimization software to do the
% optimization. You can use either 
%
% * <https://github.com/stephenbeckr/L-BFGS-B-C