feat(train): Add SequenceLength support for SFT, DPO, RLVR, RLAIF trainers#5965

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guanweim wants to merge 10 commits into

guanweim:context_length

Commits on Jun 22, 2026

feat(train): Add SequenceLength support for SFT, DPO, RLVR, RLAIF trainers
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fix: use codegen for SequenceLength shape instead of manual shapes.py edit
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refactor: preserve original recipe selection path when sequence_length not provided
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fix: correct test imports and mock setup for sequence_length tests
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address PR review: sequence_length as recipe pre-filter and simplify config
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fix: change hub_name default to None for consistency
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test: add integration test for SFT trainer with sequence_length
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Regenerate code via codegen and remove hardcoded path in data_extractor.py
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comment out gpu testing flag
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Merge branch 'master' into context_length
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