[NF4Tensor] Switch to save for backward since are now a tensor input #323
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/323
Note: Links to docs will display an error until the docs builds have been completed. ✅ You can merge normally! (1 Unrelated Failure)As of commit a6f03c1 with merge base 338d87c ( BROKEN TRUNK - The following job failed but were present on the merge base:👉 Rebase onto the `viable/strict` branch to avoid these failures
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Summary
Originally nf4tensor was not a tensor subclass, now that it is we update the autograd function to correctly save tensors for backwards. This may cause issues with torch.compile + autograd function.