chiamin

This is somehow related to the convergence in Lanczos. If I change a better initial state usually the segfault is gone.

Now I think this is essential in dealing with local symmetries, because it not only simplifies the coding but also speeds up the program because you don't need to compare...

If I compile Cytnx without using conda, there is no problem. Segmentation fault appears only in the conda environment.

I used lldb can got the following results ``` Process 193489 launched: '/home/chiamin/miniconda3/envs/cytnx/bin/python3' (x86_64) warning: (x86_64) /home/chiamin/miniconda3/envs/cytnx/lib/libstdc++.so.6 unsupported DW_FORM value: 0x1e Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run...

> > If I compile Cytnx without using conda, there is no problem. Segmentation fault appears only in the conda environment. > > Sorry, what do you mean compile Cytnx...

We sort of agree that we keep the current behavior for now, but inheriting labels from input tensors is a highly desired new function that we should seriously consider to...

We can follow this paper https://journals.aps.org/prb/abstract/10.1103/PhysRevB.95.035129 maybe we should move this to a future work rather than an issue?

What I had in mind is something like the `/` operator between two tensors in ITensor C++ version. See their documentation. (https://itensor.org/docs.cgi?vers=cppv3&page=classes/itensor) I copy their explanation as follows which may...

> Right, QTT has this concept of 'lifting' a MPS into an MPO, which I think works by regarding the MPS as an MPO with those elements on the diagonal?...

Yes, you are right! Thanks for the explanation. Now I recalled what I did with symmetric tensors. I used tensors with a mixture of symmetric and non-symmetric indices, and the...