Add staleness control #445
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Summary of ChangesHello @chenyushuo, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request introduces a robust 'staleness control' feature designed to manage the freshness of experiences sampled from different buffer types. It implements a new sampling strategy that discards experiences older than a configurable Highlights
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Code Review
This pull request introduces staleness control for experience sampling, a valuable feature for improving training stability. A new StalenessControlSampleStrategy is added, and various buffer components are updated to support filtering by oldest_valid_version. The implementation for queue-based and SQL priority-based buffers appears correct. However, I've identified some areas where the implementation is incomplete, which would prevent staleness control from functioning with file-based readers and the FIFO SQL reader. I've provided specific comments on how to address these issues. Additionally, there's some commented-out test code that should be removed for code cleanliness.
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pan-x-c
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Dec 18, 2025
pan-x-c
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Dec 18, 2025
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Description
As the title says. A complete version of #382.
Motivation:
Issues could happen with current queue buffer when
sync_style = dynamic_by_explorer:Usage:
Here's a example of how to enable staleness control in your configuration:
Checklist
Please check the following items before code is ready to be reviewed.