the backtrace further above shows the operation that failed to compute its gradient

[AlexAuthor7]

The following error occurs while running linsat.py file

LinSAT forward time: 0.0345
Traceback (most recent call last):
  File "linsat.py", line 281, in <module>
    loss.backward()
  File "/root/miniconda3/envs/torch2/lib/python3.8/site-packages/torch/_tensor.py", line 487, in backward
    torch.autograd.backward(
  File "/root/miniconda3/envs/torch2/lib/python3.8/site-packages/torch/autograd/__init__.py", line 200, in backward
    Variable._execution_engine.run_backward(  # Calls into the C++ engine to run the backward pass
RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.FloatTensor [1, 9]], which is output 0 of ExpBackward0, is at version 1; expected version 0 instead. Hint: enable anomaly detection to find the operation that failed to compute its gradient, with torch.autograd.set_detect_anomaly(True).

After adding torch.autograd.set_detect_anomaly(True) to the beginning of the code as prompted, the following error occurs

LinSAT forward time: 0.1173
/root/miniconda3/envs/torch2/lib/python3.8/site-packages/torch/autograd/__init__.py:200: UserWarning: Error detected in ExpBackward0. Traceback of forward call that caused the error:
  File "linsat.py", line 277, in <module>
    linsat_outp = linsat_layer(w, E=E, f=f, tau=0.1, max_iter=10, dummy_val=0)
  File "linsat.py", line 98, in linsat_layer
    x = kernel(x, A, b, tau, max_iter, dummy_val,
  File "linsat.py", line 174, in linsat_kernel_v1
    return torch.exp(log_x)
 (Triggered internally at /opt/conda/conda-bld/pytorch_1678402421473/work/torch/csrc/autograd/python_anomaly_mode.cpp:114.)
  Variable._execution_engine.run_backward(  # Calls into the C++ engine to run the backward pass
Traceback (most recent call last):
  File "linsat.py", line 281, in <module>
    loss.backward()
  File "/root/miniconda3/envs/torch2/lib/python3.8/site-packages/torch/_tensor.py", line 487, in backward
    torch.autograd.backward(
  File "/root/miniconda3/envs/torch2/lib/python3.8/site-packages/torch/autograd/__init__.py", line 200, in backward
    Variable._execution_engine.run_backward(  # Calls into the C++ engine to run the backward pass
RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.FloatTensor [1, 9]], which is output 0 of ExpBackward0, is at version 1; expected version 0 instead. Hint: the backtrace further above shows the operation that failed to compute its gradient. The variable in question was changed in there or anywhere later. Good luck!

[rogerwwww]

Hi, sorry for the late reply. Can you offer a minimal example of your code to reproduce this issue?

[rogerwwww]

Now it shall be fixed by b8f9833. Please try again by upgrading pip install -U linsatnet

[rogerwwww]

I am closing this issue because it is no longer active. Please feel free to reopen it if you still face the error