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title: FAQ
description: Frequently asked questions
---
**Q: The trainer stopped and hasn't progressed in several minutes.**
> A: Usually an issue with the GPUs communicating with each other. See the [NCCL doc](nccl.qmd)
**Q: Exitcode -9**
> A: This usually happens when you run out of system RAM.
**Q: Exitcode -7 while using deepspeed**
> A: Try upgrading deepspeed w: `pip install -U deepspeed`
**Q: AttributeError: 'DummyOptim' object has no attribute 'step'**
> A: You may be using deepspeed with single gpu. Please don't set `deepspeed:` in yaml or cli.
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