evaluate isherm rather than using _isherm in tr
evaluate isherm rather than using _isherm in tr

qutip/qutip,qutip/qutip,anubhavvardhan/qutip,cgranade/qutip,zasdfgbnm/qutip,zasdfgbnm/qutip,anubhavvardhan/qutip,cgranade/qutip