Add support for PyTorch v2.2 #476
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The main blocker was making sure our hacked-together
LocalShardedCheckpointerclass was updated to account for the recent changes to FSDP internals. I've verified that this checkpointer still works correctly. Here is a restart that reproduces the original loss curve perfectly:See https://wandb.ai/ai2-llm/torch-22-testing?workspace=user-epwalsh for full logs.