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What is the meaning of NCCL_UCX_CUDA_DISABLE? #181

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@shanleo2024

Hi dear developer,
I noticed in ucx_init_context, there is a veriable named NCCL_UCX_CUDA_DISABLE, which will filter the UCX_TLS=cuda
Cannot catch the point, why here filter the UCX_TLS=cuda?
Is it mean the UCX_TLS=cuda only work intra node? but if uses set UCX_TLS=cuda mannually, NCCL run the UCX plugin will cause an error.

Could you please give me somg hints?
Thanks a lot!

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