SP Comm-optimization: fuse query, key, and value all-2-all for better SP perforamnce #4735
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This PR fuses the query, key, and value sequence-parallel AlltoAlls with the help of the new api changes drafted on a PR for Megatron-DeepSpeed repo. With these changes, we can reduce the communication overhead especially when increasing the the SP-degree to >2 (4 or 8).
cc: @samadejacobs @tjruwase @tohtana