Dear Erling,
I agree with you, and I will have a try through rescaling some parameter values.
@Rachel_hua Please read and carefully study my new CVXQUAD META post (you inspired me to include one particular sentence in the installation instructions 
). CVXQUAD: How to use CVXQUAD’s Pade Approximant instead of CVX’s unreliable Successive Approximation for GP mode, log, exp, entr, rel_entr, kl_div, log_det, det_rootn, exponential cone. CVXQUAD’s Quantum (Matrix) Entropy & Matrix Log related functions This may help you and others for future proiblems, and hopefully reduce my posting burdens, as I’d like to slide into semi-retirement as a question answerer on this forum.
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Thank you Mark, I will read your CVXQUAD META post.
It is no longer META, but it is pinned.
I hope everyone who uses the relevant functions or modes will read it. And for those who don’t, my answer may just consist of linking to it unoless there is something new in their post which isn’t covered (yet) in the pinned thread.