Refactor Apriel2 cache, add Qwen2 converter, and conversation format for SFT#422

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tscholak wants to merge 15 commits intomainfrom

feature/cache-refactor-and-qwen2

Commits on Dec 14, 2025

Commits on Dec 15, 2025

Add conversation format support for SFT data preparation

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claude
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Cleanup: remove private method indirection, revert test changes

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claude
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Commits on Dec 16, 2025

Refactor test organization: rename modules and remove duplication

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claude
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Fix O(n²) tokenization and add Qwen2 training examples

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claude
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Improve Apriel2 conversion config composition and documentation

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claude
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Commits on Dec 17, 2025

Commits on Dec 19, 2025

Skip roundtrip integration tests on CPU-only CI

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claude
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Commits on Dec 20, 2025