After vector retrieval retrieves a batch of relevant information, it is still possible to rank superficially similar paragraphs at the front. This article introduces the reranking use of BGE Reranker v2 M3, explains its division of labor with the embedding model, and gives a method to compare the number of candidates, response time and answer basis. The correlation score is used for ranking reference and cannot be directly used as factual accuracy or credibility percentage.
ChinaOPC Editorial TeamOriginal analysis2 min readChina2 views
Source timingPublic information and official documents; verified on October 23, 2026.
Wisdom Source Model Card Introduction BGE Reranker v2 M3 scores the relevance of questions and candidate texts. It has a different purpose than BGE-M3, which generates vectors; the scores are not equivalent to the probability of factual correctness after normalization.
Before reordering, you must be able to retrieve the materials.
Simulate customer service knowledge retrieval. If the correct term is not retrieved at all in the first step, reordering cannot make up the term out of thin air. Therefore, recall and ranking should be evaluated separately: first check whether the correct information is among the candidates, and then see whether it is ranked higher.
The number of candidates is the actual running selection
More candidates may increase comparison opportunities and also increase calculations. Fixed test questions can be used to observe the waiting time and result changes for different numbers of candidates. Don't directly increase the number of candidates without evaluation.
The result still needs to be checked for validity and permissions
Old, highly relevant files may no longer be available, and internal information may not be visible to current users. These business constraints should be retained before and after sorting, and the specific version finally adopted should be cited when answering. This article has not conducted independent performance testing. For official access, the deployment resources and model licenses should be checked at the same time.
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