TypeError: can't convert cuda:0 device type tensor to numpy.

[vnikoofard]

Hi,
When I ran the example code mentioned in the repository, I mean

import aifeynman

aifeynman.get_demos("example_data") # Download examples from server
aifeynman.run_aifeynman("./example_data/", "example1.txt", 60, "14ops.txt", polyfit_deg=3, NN_epochs=500)

I got the following error. What would be the reason?

Training a NN on the data...

NN loss: (tensor(0.0011, device='cuda:0', grad_fn=), SimpleNet(
(linear1): Linear(in_features=3, out_features=128, bias=True)
(linear2): Linear(in_features=128, out_features=128, bias=True)
(linear3): Linear(in_features=128, out_features=64, bias=True)
(linear4): Linear(in_features=64, out_features=64, bias=True)
(linear5): Linear(in_features=64, out_features=1, bias=True)
))

Checking for symmetries...

Checking for separabilities...

TypeError Traceback (most recent call last)
/tmp/ipykernel_71/483010986.py in
2
3 aifeynman.get_demos("example_data") # Download examples from server
----> 4 aifeynman.run_aifeynman("./example_data/", "example1.txt", 60, "14ops.txt", polyfit_deg=3, NN_epochs=500)

/opt/conda/lib/python3.7/site-packages/aifeynman/S_run_aifeynman.py in run_aifeynman(pathdir, filename, BF_try_time, BF_ops_file_type, polyfit_deg, NN_epochs, vars_name, test_percentage)
272 PA = ParetoSet()
273 # Run the code on the train data
--> 274 PA = run_AI_all(pathdir,filename+"_train",BF_try_time,BF_ops_file_type, polyfit_deg, NN_epochs, PA=PA)
275 PA_list = PA.get_pareto_points()
276

/opt/conda/lib/python3.7/site-packages/aifeynman/S_run_aifeynman.py in run_AI_all(pathdir, filename, BF_try_time, BF_ops_file_type, polyfit_deg, NN_epochs, PA)
94 idx_min = -1
95 else:
---> 96 idx_min = np.argmin(np.array([symmetry_plus_result[0], symmetry_minus_result[0], symmetry_multiply_result[0], symmetry_divide_result[0], separability_plus_result[0], separability_multiply_result[0]]))
97
98 print("")

/opt/conda/lib/python3.7/site-packages/torch/_tensor.py in array(self, dtype)
676 return handle_torch_function(Tensor.array, (self,), self, dtype=dtype)
677 if dtype is None:
--> 678 return self.numpy()
679 else:
680 return self.numpy().astype(dtype, copy=False)

TypeError: can't convert cuda:0 device type tensor to numpy. Use Tensor.cpu() to copy the tensor to host memory first.

[ParticleTruthSeeker]

I have the same problem. Did you find a solution?

[shastro]

I have the same issue. Is this an issue with the code?

[Kolby-Bum]

I wrote a solution (that is working for me) for this problem. Essentially, the "symmetry_plus_result" and similar calls can either return a float or a float with a torch.Tensor datatype. "np.argmin()" can only work with floats so the code below converts all the error checks from torch.Tensor datatype to numbers.

Replace the whole if/else statement in S_run_aifeynman with the code below.

if symmetry_plus_result[0]==-1:
        idx_min = -1
    else:
        min_error_array = [symmetry_plus_result[0], symmetry_minus_result[0], symmetry_multiply_result[0], symmetry_divide_result[0], separability_plus_result[0], separability_multiply_result[0]]
        
        # Change all resultant errors to integers
        for i in range(6):
          # If the element is a torch.Tensor
          if type(min_error_array[i]) == torch.Tensor:
            # Extract the number in the tensor as a number
            min_error_array[i] = min_error_array[i].item()

        #Find the minimum error
        idx_min = np.argmin(np.array(min_error_array))

I'm modifying the Colab notebook from https://towardsdatascience.com/ai-feynman-2-0-learning-regression-equations-from-data-3232151bd929 to run AIF for clarity.

[AndreScaffidi]

Could you do a pull request with the fix?

[kvyaswanth]

It got this error here. I just used .cpu() for every element and it was resolved.

[JaoCR]

Just ran into this issue here, @Kolby-Bum 's solution solves part of the problem, there is also another line where the issue must be tackled. I think I'll submit a pull request to fix this as nothing seems to have happened since April

[JaoCR]

Checked the other branches and current pull requests, didn't see nothing related, someone let me know if this is already being worked on and I didn't see it