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This is the first "new style" collective that doesn't use the pattern where it is initialized once, holds some state, and is used many times. The new style is intended for use where collectives can be called at any time, such that initialization can no longer be amortized because reuse may no longer apply.
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Summary: Like gather in the previous commit, this is a single function and doesn't hold on to any state. This implements a ring allgather. Rebase needed after #136 is merged. Pull Request resolved: #137 Reviewed By: teng-li Differential Revision: D10376419 Pulled By: pietern fbshipit-source-id: bc561bff4c8952531bada14dfe0bc2e9d9c68f78
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This is the first "new style" collective that doesn't use the pattern
where it is initialized once, holds some state, and is used many times.
The new style is intended for use where collectives can be called at any
time, such that initialization can no longer be amortized because reuse
may no longer apply.