[bugfix] support negative-only pointwise reranker data and fix evaluation metrics#8503

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yinpu wants to merge 5 commits intomodelscope:mainfrom

yinpu:fix/reranker-pointwise-negative-only

Commits on Apr 1, 2026

Support negative-only pointwise reranker data

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Fix reranker group size eval regressions

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Fix reranker evaluation metric publishing

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Fix reranker metric gather for group sizes

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Commits on Apr 2, 2026

Merge branch 'modelscope:main' into fix/reranker-pointwise-negative-only
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