CUDA runtime error (59) : device-side assert triggered

Question

THCudaCheck FAIL file=/opt/conda/conda-bld/pytorch_1524584710464/work/aten/src/THC/generated/../generic/THCTensorMathPointwise.cu line=265 error=59 : device-side assert triggered
Traceback (most recent call last):
  File "main.py", line 109, in <module>
    train(loader_train, model, criterion, optimizer)
  File "main.py", line 54, in train
    optimizer.step()
  File "/usr/local/anaconda35/lib/python3.6/site-packages/torch/optim/sgd.py", line 93, in step
    d_p.add_(weight_decay, p.data)
RuntimeError: cuda runtime error (59) : device-side assert triggered at /opt/conda/conda-bld/pytorch_1524584710464/work/aten/src/THC/generated/../generic/THCTensorMathPointwise.cu:265

How do I resolve this error?

Answer 1

This is usually an indexing issue.

For example, if your ground truth label starts at 1:

target = [1,2,3,4,5]

Then you should subtract 1 for every label instead so that:

target = [0,1,2,3,4]

Answer 2

In general, when encountering cuda runtine errors, it is advisable to run your program again using the CUDA_LAUNCH_BLOCKING=1 flag to obtain an accurate stack trace.

In your specific case, the targets of your data were too high (or low) for the specified number of classes.

Answer 3

I encountered this error when running BertModel.from_pretrained('bert-base-uncased'). I found the solution by moving to the CPU when the error message changed to 'IndexError: index out of range in self'. Which led me to this post. The solution was to truncate sentences to length 512.