Problems using PINNs

[neumannoskar]

I've tried to use the example for the logistic_equation_1d.py . It produces following error

line 94, in train_model
loss_evolution.append(loss.detach().numpy())
RuntimeError: Numpy is not available

I'm using Python 3.10.4.

Thank's for any help.

[fabioantonini]

Hi
I guess you need to install the package 'numpy' in your python environment.
Take a look at the following link
Hope this helps

[neumannoskar]

Hey, thank's for the quick reply. That's is not the problem, since the script logistic_equation_1d.py would produce an error earlier when trying to import numpy in line 7.

So the package 'numpy' is definitely installed.

[fabioantonini]

Hi I found also this link helpful https://stackoverflow.com/questions/71689095/how-to-solve-the-pytorch-runtimeerror-numpy-is-not-available-without-upgrading

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On 04/08/22 10:57, neumannoskar wrote: Hey, thank's for the quick reply. That's is not the problem, since the script |logistic_equation_1d.py| would produce an error earlier when trying to import numpy in line 7. So the package 'numpy' is definitely installed. — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABNETHMGXROU2HVF6RGADPLVXOAYBANCNFSM55RTH3YQ>. You are receiving this because you commented.Message ID: ***@***.***>

[neumannoskar]

I found this post already, but unfortunately this version of torch is not available anymore. Trying to downgrade produces:

ERROR: Could not find a version that satisfies the requirement torch==0.9.1 (from versions: 1.11.0, 1.12.0)
ERROR: No matching distribution found for torch==0.9.1

[madagra]

Hello,

I pinned the version in the requirements.txt file, but it is unnecessary. You can try to install the dependencies manually yourself in a virtual environment:

python -m venv .env
source .env/bin/activate
pip install numpy torch matplotlib

Try then to execute the code again.

[fabioantonini]

You are definitely right. That piece of code is trying to convert the 'loss' torch tensor to a numpy array. It sounds as if the numpy() method would not be available. Are you using a CPU or a GPU? Anyway try this loss.detach().cpu().numpy()

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On 04/08/22 10:57, neumannoskar wrote: Hey, thank's for the quick reply. That's is not the problem, since the script |logistic_equation_1d.py| would produce an error earlier when trying to import numpy in line 7. So the package 'numpy' is definitely installed. — Reply to this email directly, view it on GitHub <#1 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABNETHMGXROU2HVF6RGADPLVXOAYBANCNFSM55RTH3YQ>. You are receiving this because you commented.Message ID: ***@***.***>

[madagra]

I am going to close this issue since I assume the problem has been solved with the two comments above.