GitAuto: Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu! error

[gitauto-ai]

Resolves #56

Why the bug occurs

The error "Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!" occurs because some tensors are being used on different devices (CPU and GPU) during operations without proper synchronization. Although torch.cuda.is_available() returns True, indicating that CUDA is available, not all tensors are moved to the same device, leading to device mismatch errors during computations.

How to reproduce

1. Ensure that CUDA is available and torch.cuda.is_available() returns True.
2. Run the application or script that performs tensor operations without consistently moving all tensors to the same device.
3. Trigger a computation that involves multiple tensors, some on cuda:0 and others on cpu.
4. Observe the error: "Expected all tensors to be on the same device, but found at least two devices, cuda:0 and cpu!"

How to fix

Ensure that all tensors involved in computations are moved to the same device, either CPU or CUDA. Modify the code to consistently allocate tensors to the desired device. For example, if using CUDA, move tensors like next_states to cuda only if CUDA is available:

if torch.cuda.is_available():
    next_states = next_states.cuda()

Alternatively, if you prefer to run computations on CPU, disable CUDA usage by commenting out or removing the lines that move tensors to CUDA:

# if torch.cuda.is_available():
#     next_states = next_states.cuda()

This prevents tensors from being inadvertently placed on different devices, avoiding the device mismatch error.

Test these changes locally

git checkout -b gitauto/issue-56-d840148b-072f-4db6-aa72-2f5ace6a1c23
git pull origin gitauto/issue-56-d840148b-072f-4db6-aa72-2f5ace6a1c23

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