# The declaration-only header for NCCL | |
The header is copied from a build of NCCL (2.18.1 as of writing). | |
This declaration-only header is required to query the dynamically injected | |
NCCL API at runtime. See the following for more information: | |
* [NCCL Documentation](https://docs.nvidia.com/deeplearning/nccl/index.html) | |
* [BSD License](https://docs.nvidia.com/deeplearning/nccl/bsd/index.html) | |
* [Repository](https://github.com/NVIDIA/nccl) |