Xapian索引-文档检索过程分析之匹配百分比

2022-04-27 00:00:00 文档计算匹配打分相关性

本文属于文档检索过程分析的一部分，重点分析文档匹配百分比（percent）的计算过程。

1 percent是什么？

我们之前分析的检索demo：

Xapian::Query term_one = Xapian::Query("T世界");
Xapian::Query term_two = Xapian::Query("T比赛");
Xapian::Query query = Xapian::Query(Xapian::Query::OP_OR, term_one, term_two); // query组装

std::cout << "query=" << query.get_description() << std::endl;

Xapian::Enquire enquire(db);
enquire.set_query(query);
Xapian::MSet result = enquire.get_mset(, 10); // 执行检索，获取结果
std::cout << "find results count=" << result.get_matches_estimated() << std::endl;

for (auto it = result.begin(); it != result.end(); ++it) {
    Xapian::Document doc = it.get_document();
    std::string data = doc.get_data();
    double doc_score_weight = it.get_weight();
    /// 匹配百分比
    int doc_score_percent = it.get_percent();
    std::cout << "doc=" << data << ",weight=" << doc_score_weight << ",percent=" << doc_score_percent << std::endl;
}

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