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Issue #, if available:
This is part of the fix for a race-condition occurring in the GPU, referenced in: #1744.
Description of changes:
We need a way to explicitly synchronize some background processes that configure GPU instances in the GPU AMI. This will run a helper script if it's present, which will perform GPU-AMI-specific actions. The helper script will only be present on GPU AMI's.
As the code comment states, this is not intended to be a way for users to inject arbitrary logic into the bootstrap script! Don't do that.
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