[DO NOT MERGE] Add device_scatter, device_scatterv, device_gather utility functions#5491
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seunghwak wants to merge 1 commit intorapidsai:mainfrom
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[DO NOT MERGE] Add device_scatter, device_scatterv, device_gather utility functions#5491seunghwak wants to merge 1 commit intorapidsai:mainfrom
seunghwak wants to merge 1 commit intorapidsai:mainfrom
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…toall to use raft alltoall
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This PR is dependent on rapidsai/raft#3002; should be merged after the raft PR.
This PR adds device_scatter, device_scatterv, device_gather utility functions.
device_alltoallis updated to useraft::comms_t::alltoallwhich is a wrapper of ncclAlltoAll (added in NCCL 2.28.3).