Upgrade to ITensor v3 compatibility

[jhpeng]

Dear Mr. Stoudenmire,

I'm trying to compile the code. However, the compiler shows that "parallel_dmrg.h:105:13: error: ‘MPSt’ has not been declared". I appreciate any hint on these questions.

By the way, it is no problem for me to compile the dmrg code on the itensor website.

[emstoudenmire]

Hi, what version of ITensor are you using to try to compile this code? Unfortunately the code is only written for version 2.x of ITensor currently, as noted on the Codes page of the itensor.org website.

[emstoudenmire]

I'll note this in the README as well

[jhpeng]

Thank you very much!

[emstoudenmire]

I just changed the name of this issue to reflect that we, or someone else should upgrade this code to become compatible with v3 of ITensor.

By the way, please send me at email [email protected] if you want to discuss your project a bit and whether you actually need parallel DMRG for it. There may be better approaches you can try first.