fix stream dependencies in callbacks #246
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Summary: use http transport instead of pg transport -- pg transport fails to resolve address when running locally
This was referenced Jul 26, 2025
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Summary: deep copy the state dict for sending checkpoint because if the replica moves to the next step, the state dict can change before the checkpoint is sent
Summary: - call future.wait in callbacks to make sure the continuation executes after the future has completed - set the stream correctly to execute callback scheduled by bucketized allreduce
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