ARTICLEDEV.to AI·5/8/2026
From -9.15pp to +0.61pp: An engineering journey through four DPO iteration failures
An engineering team conducted four DPO training iterations on Qwen2.5-Coder-7B-Instruct, aiming to surpass its 87.20% HumanEval pass@1 score. The initial three attempts failed due to pipeline bugs that were not caught by existing quality gates, with the fourth iteration ultimately yielding a +0.61pp improvement.
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