Also known as Wilcoxon rank-sum test, Wilcoxon–Mann–Whitney test, Wilcoxon U test, U test, Mann–Whitney U
nonparametric test of the null hypothesis that, for randomly picked values X and Y from 2 populations, Pr(X>Y)=Pr(Y>X)
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).