[FSDP][optim_state_dict] Ensure correct devices for tensors when doing all_gather #92992
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…g all_gather [ghstack-poisoned]
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/92992
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…s when doing all_gather" When doing `_all_gather_optim_state`, we need to ensure that `step` tensors are on CPU and other tensors are on GPUs. This PR add the logic to ensure the locality. [ghstack-poisoned]
…s when doing all_gather" When doing `_all_gather_optim_state`, we need to ensure that `step` tensors are on CPU and other tensors are on GPUs. This PR add the logic to ensure the locality. [ghstack-poisoned]
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Stack from ghstack (oldest at bottom):
When doing
_all_gather_optim_state, we need to ensure thatsteptensors are on CPU and other tensors are on GPUs. This PR add the logic to ensure the locality.