flash-attention/csrc/xentropy/README.md

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This CUDA extension implements optimized cross-entropy loss, adapted from Apex's
[Xentropy](https://github.com/NVIDIA/apex/tree/master/apex/contrib/xentropy).
We make it work for bfloat16 and support in-place backward to save memory.
```sh
cd csrc/xentropy && pip install .
```