"ops" bug with ITensorMPS

ITensor Julia Questions
1

Hi!

I started to migrate my code with ITensorMPS and I encountered an error while running the following example from the libraray:

WARNING: both ITensorMPS and ITensors export “ops”; uses of it in module Main must be qualified
ERROR: LoadError: UndefVarError: ops not defined

This error doesn’t appear while only using ITensors library, however, the inner function throws an error in that case.

Is there a way to define these gates with ITensorMPS library?

2

If you change the line to gates = ITensors.ops(... things should work

For the warning, the line should be @show inner(psi', rho, psi), the inner is missing a prime.

(also it would be helpful if you wanted to open a PR on github to fix these!)

3

That looks like a bug, the code in your original post should work. I’ll take a look.

4

Fixing this in Fix `ops` export by mtfishman · Pull Request #26 · ITensor/ITensorMPS.jl · GitHub.

1 Like
5

The fix is being registered in ITensorMPS.jl v0.2.5, please update your packages and let us know if that fixes your original issue.

6

Thank you for fixing the bug quickly.
However, I am having trouble with updating to v.0.2.5.
I removed the current version and tried to install it again, I am getting the following error:

(@v1.9) pkg> add ITensorMPS@v0.2.5
Resolving package versions…
ERROR: Unsatisfiable requirements detected for package ITensorMPS [0d1a4710]:
ITensorMPS [0d1a4710] log:
├─possible versions are: 0.1.0-0.2.4 or uninstalled
└─restricted to versions 0.2.5 by an explicit requirement — no versions left

7

Please try again, I’m able to update to ITensorMPS v0.2.5. You may have just tried too quickly and the registration process hadn’t completed.