DocumentWeightingRules
DocumentWeightingRules
是 TextSearch 及相关函数的一个选项，允许根据搜索索引中字段的值来指定文档的权重.
更多信息
- DocumentWeightingRules -> <"field1" -> <val11 -> weight11, val12 -> weight12, …>, "field2" -> <…>, …> 意味着字段 "fieldi" 值为 valij 的文档的分数要乘以 weightij.
- 对于用于 DocumentWeightingRules 的字段，需要把 ContentFieldOptions 中的 "Stored" 或"BulkRetrievalOptimized" 选项设置为 True.
- 出于提高性能的目的，"BulkRetrievalOptimized" 最好是设置为 "Stored".
范例
打开所有单元 关闭所有单元基本范例 (1)
index = CreateSearchIndex[{
ContentObject[<| "Text" -> "orange", "Title" -> "doc1", "Quality" -> "high"|>],
ContentObject[<| "Text" -> "orange", "Title" -> "doc2", "Quality" -> "low"|>]
},
ContentFieldOptions -> <|"Quality" -> <|"BulkRetrievalOptimized" -> True|>|>,
DocumentWeightingRules -> <|"Quality" -> <|"high" -> 2, "low" -> 0.5|>|>]TextSearch[index, "orange"][All, {"Title", "Score"}]index = CreateSearchIndex[{
ContentObject[<| "Text" -> "orange", "Title" -> "doc1"|>],
ContentObject[<| "Text" -> "orange", "Title" -> "doc2"|>]
}]TextSearch[index, "orange"][All, {"Title", "Score"}]可能存在的问题 (2)
只有在对索引进行搜索时才进行文档加权，对文件进行搜索时则不需要：
TextSearch["ExampleData/Text", "dog", DocumentWeightingRules -> {"Quality" -> {"high" -> 2, "low" -> .3}}][1, "Score"]用于文档加权的字段必须在索引的 ContentFieldOptions 中把 "Stored" 或 "BulkRetrievalOptimized" 设置为 True：
index = CreateSearchIndex[{
ContentObject[<| "Text" -> "orange", "Title" -> "doc1", "Quality" -> "high"|>],
ContentObject[<| "Text" -> "orange", "Title" -> "doc2", "Quality" -> "low"|>]
}]TextSearch[index, "orange", DocumentWeightingRules -> {"Quality" -> {"high" -> 2, "low" -> .3}}][All, {"Title", "Score"}]
Wolfram Research (2017)，DocumentWeightingRules，Wolfram 语言函数，https://reference.wolfram.com/language/ref/DocumentWeightingRules.html.
文本
Wolfram Research (2017)，DocumentWeightingRules，Wolfram 语言函数，https://reference.wolfram.com/language/ref/DocumentWeightingRules.html.
CMS
Wolfram 语言. 2017. "DocumentWeightingRules." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/DocumentWeightingRules.html.
APA
Wolfram 语言. (2017). DocumentWeightingRules. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/DocumentWeightingRules.html 年