Output.dat is not created

[HamidArianZad]

Dear TeNeS team,

In my recent TN simulations using TeNeS, I encountered an issue with saving the calculation results in the 'output.dat' file. I'm currently using the command $ python tutorial_magnetization.py > output.dat to save the output. However, despite the file being created, the results are not written into it. Consequently, the calculation process halts, and when I check the 'output.dat' file, I only see the following lines.

Number of Processes: 1
Number of Threads / Process: 16
Tensor type: real
Bond dimensions:
   D  (Bulk): 2
   chi (CTM): 10
Start simple update

after line "Start simple update" there is nothing. How can I write the results into the output.dat during the calculation time?

[yomichi]

• From the last successful run, did you change something?
  • python script, simulation parameter, tenes itself (version, branch, commit), environments (e.g., OS)
• Could you give more information?
  • version of TeNeS
  • input files
    • tutorial_magnetization.py
    • input.toml which fails

[HamidArianZad]

In fact, I previously used TeNeS in my previous notebook, and everything worked fine. Please note that the previous version installed on my previous notebook was ver. 1.2.0: 2021-12-13.

I have now installed TeNeS on my new notebook and attempted to save the results of my calculations into the 'output.dat' file as usual. However, I encountered some difficulties.

The version of TeNeS installed on my notebook is 1.3.1: 2022-10-21. The file 'tutorial_magnetization.py' can be found in the folder '/TeNeS/sample/05_magnetization', which was automatically created during the TeNeS installation process.

The input file, 'input_0_1500.toml', was generated by running the 'tutorial_magnetization.py' file.

I have not made any changes to the parameters in the files located in the '/TeNeS/sample/05_magnetization' folder. I simply installed TeNeS on my new notebook and executed the command '$ python tutorial_magnetization.py > output.dat'.

[yomichi]

In your new notebook, does TeNeS v1.2.0 work (sample/05_magnetization)?

[HamidArianZad]

I have not attempted it.

Should I uninstall the current version, 1.3.1: 2022-10-21, and install the older version, v1.2.0? If necessary, I would prefer to continue working with the newer version, 1.3.1: 2022-10-21, as I believe it performs better than the older version. In the newer version (ver: 1.3.1), if I execute the command $ python tutorial_magnetization.py without appending > output.dat, the program runs successfully until the completion of the calculations. I can then access the results of the magnetization, which are saved in the file magnetization.dat. Other quantities are also saved after the calculations are finished.

I think the results for the local magnetization in Heisenberg spin models are more precise with the newer version v1.3.1 compared to older version v1.2.0.

[yomichi]

Yes, the newer version is recommended, of course (FYI, we released v1.3.2 yesterday).

In the newer version (ver: 1.3.1), if I execute the command $ python tutorial_magnetization.py without appending > output.dat, the program runs successfully until the completion of the calculations. I can then access the results of the magnetization, which are saved in the file magnetization.dat. Other quantities are also saved after the calculations are finished.

Is the problem solved?

[HamidArianZad]

Appending > output.dat in version ver: 1.3.1 did not resolve the issue for me.

I am pleased to hear about the release of the latest version, v1.3.2. I would like to upgrade to this version. Could you please provide me with the command to upgrade from v1.3.1 to v1.3.2? Alternatively, do I need to uninstall the older version, v1.3.1, and then install the new version, v1.3.2?