Why is Cosine distance not supported for knn on CPUs?

[bokveizen]

At https://github.com/rusty1s/pytorch_cluster/blob/master/csrc/knn.cpp#L34, we see that cosine distance is not supported for knn on CPUs. Are there specific reasons for this limitation? Also, are there simple workarounds if we want to use cosine distance on CPUs?

[github-actions]

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