pytorch device_error ai_generated true

RuntimeError: Expected all tensors to be on the same device

ID: pytorch/cuda-device-mismatch

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85%Fix Rate
88%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2 active — — —

Root Cause

Tensors on different devices (CPU vs GPU).

generic

Workarounds

  1. 92% success Use .to(device) consistently: tensor.to(model.device)
  2. 90% success Define device once and use throughout: device=torch.device("cuda:0")

Dead Ends

Common approaches that don't work:

  1. Move everything to CPU 68% fail

    Loses GPU acceleration

  2. Use .cuda() without specifying device 72% fail

    Wrong GPU in multi-GPU setup