1. remove orphan node;fix barriers

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  2. remove orphan node

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  3. remove orphan node

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  4. remove orphan node

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  5. remove orphan node

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  6. remove orphan node

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  7. remove orphan node

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  8. remove orphan node

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  9. remove orphan node

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  10. remove orphan node

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  11. remove orphan node

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  12. remove orphan node

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  13. remove orphan node

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  14. remove orphan node

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  15. remove orphan node

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  16. remove orphan node

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  17. remove orphan node

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  18. remove orphan node

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  19. remove orphan node

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  20. remove orphan node

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