add cuda mode to contributing
@@ -42,6 +42,8 @@ pytest -vs -n auto
To run a single test from the command line
```sh
pytest -vs {path_to_test}::{test_name}
+# or in cuda mode
+CUDA_TEST=1 PYRO_TENSOR_TYPE=torch.cuda.DoubleTensor pytest -vs {path_to_test}::{test_name}
```
## Testing Tutorials
