Dear PSI4 community,
I have a trouble of obtaining the ref_wfn from the CASSCF procedure. I noticed that psi4.driver.scf_helper() can be used to return the ref_wfn of a SCF calculation. Do we have similar functions which instead work for the CASSCF?
Thanks 
You should never have to call scf_helper manually.
Any time you call energy, you should be able to pass return_wfn = True to get the wavefunction object, as described here. That’s the CASSCF wavefunction. You should be able to call the Wavefunction object’s reference_wavefunction method to get the HF wavefunction we use for the guess orbitals.
Can I ask what part of the documentation was confusing? I have a guess, but want to see if I’m right before devoting the energy to make the necessary documentation improvements.