Cannot set requires_grad in deepfool

[zhxgj]

The deepfool method fails due the error below

  File "/dccstor/ddig/jbtang/tools/anaconda3/envs/python3/lib/python3.6/site-packages/torchattacks/attacks/deepfool.py", line 29, in forward
    image.requires_grad = True
RuntimeError: you can only change requires_grad flags of leaf variables.

[Harry24k]

Thank you for noticing me. That error arises because of 'break' in iterations. I solved this error with adding '.detach()' . Please refer b0510b5.

[zhxgj]

Thank you @Harry24k for your quick fix!