Comments (1)
Yes, it is a bug of using DETCI in MCSCF_2STEP. The MCSCF_2STEP is trying to read the previous DETCI results as starting guess for Davidson-Liu. I thought I turned it off in the master because the procedure is not yet working.
What I did is simple. The DL solver just use the wave functions from the previous orbital optimization step. This means that the DL guess size is equal to the number of roots.
I am uncertain why it is not working. Perhaps it is the phase of orbital or CI is not fixed. It could also be the guess size now becomes too small. A better approach is probably copying the wave functions from the previous step to the current set of guesses and then orthogonalizing the guesses against the old wave functions.
from forte.
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from forte.