AttributeError: module 'ecole' has no attribute 'instance'

[augustgao1995]

Describe the bug

Dear professor,

Sorry for bothering.
I got this error,

But I have install ecole via this,

Could you help me? How do you think about this error? Thank you very much, professor.

Yijie Gao (University of Sydney),
Sincerely.

Setting

• OS: <!--- LInux --->
• Compiler: <!--- if applicable e.g. gcc, clang... with version --->
• Python version:3.8.2
• Ecole version:0.4.5

[AntoinePrv]

Hello @augustgao1995,

Nice to meet you. I'm personally a graduate student in Polytechnique Montréal.
You're not bothering at all, we want to make sure Ecole is bug-free.

I am not able to reproduce this problem with Ecole 0.4.5, but this sounds like something that would happen with previous versions.
I'd first like to make sure of the version you are using. Can you run the following in your notebook:

print("version: {v.major}.{v.minor}.{v.patch}@{v.git_revision}".format(v=ecole.core.get_build_version()))

On my computer, it prints

version: 0.4.5@1f7e82d73593e6d203d270378837c0996094dc40

[augustgao1995]

I got this.

by the way, I tried another install command of Ecole, and I got this.

[AntoinePrv]

The print command:

print("version: {v.major}.{v.minor}.{v.patch}@{v.git_revision}".format(v=ecole.core.get_build_version()))

is Python code, so you'll need to run it in your Jupyter Notebook that you showed in your first message.

Otherwise, in you terminal, you can try the command:

python -m ecole.version

---

For the new install command you run, I am not sure what is going on, but one hypothesis I have is that we currently need to run the command with both scipopt and conda-forge channel at all time. Therefore you would need to do

conda install -c conda-forge -c scipopt ecole

If your conda environment is getting corrupted, perhaps you could create a new one?

conda create -n other_ecole -c conda-forge -c scipopt ecole pyscipopt

[augustgao1995]

Thank you for your patience and help. I got this error in Jupiter notebook.

[AntoinePrv]

In that last error message, name 'ecole' is not defined, Python is telling you that you are using some name (ecole) that is not in your scope.
Indeed, it does not exist yet in your notebook. You need to import ecole for that code to work.

---

I cannot reproduce your error under any version of ecole since the instance generator were introduced (v0.3.0).
I think the best thing to do for you would be to try to reinstall everything from the start.

conda uninstall ecole
conda install -c conda-forge -c scipopt 'ecole>=0.4'

[augustgao1995]

I solve this, thank you very much.