elasticsearch 理解elasticsearch查询分数解释

我试图破解elasticsearch响应中的explain API。但是有点迷路了。这对我来说有点难理解。是否有任何简单的指针或链接可以更具体地解释JSON？我对TF、IDF和VSM中的余弦相似性有一个了解。但更具体地说，需要一些关于JSON的指针。如果我能找到一个简单的数学表达式来解释这个JSON，那将是一个理想的选择

{
  "_explanation": {
    "value": 7.937373,
    "description": "sum of:",
    "details": [
      {
        "value": 2.4789724,
        "description": "weight(FirstName:M80806 in 35) [PerFieldSimilarity], result of:",
        "details": [
          {
            "value": 2.4789724,
            "description": "score(doc=35,freq=1.0), product of:",
            "details": [
              {
                "value": 0.37350902,
                "description": "queryWeight, product of:",
                "details": [
                  {
                    "value": 6.6369815,
                    "description": "idf(docFreq=720, maxDocs=202323)"
                  },
                  {
                    "value": 0.056276944,
                    "description": "queryNorm"
                  }
                ]
              },
              {
                "value": 6.6369815,
                "description": "fieldWeight in 35, product of:",
                "details": [
                  {
                    "value": 1,
                    "description": "tf(freq=1.0), with freq of:",
                    "details": [
                      {
                        "value": 1,
                        "description": "termFreq=1.0"
                      }
                    ]
                  },
                  {
                    "value": 6.6369815,
                    "description": "idf(docFreq=720, maxDocs=202323)"
                  },
                  {
                    "value": 1,
                    "description": "fieldNorm(doc=35)"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "value": 2.6825092,
        "description": "weight(FirstName:M8086 in 35) [PerFieldSimilarity], result of:",
        "details": [
          {
            "value": 2.6825092,
            "description": "score(doc=35,freq=1.0), product of:",
            "details": [
              {
                "value": 0.38854012,
                "description": "queryWeight, product of:",
                "details": [
                  {
                    "value": 6.9040728,
                    "description": "idf(docFreq=551, maxDocs=202323)"
                  },
                  {
                    "value": 0.056276944,
                    "description": "queryNorm"
                  }
                ]
              },
              {
                "value": 6.9040728,
                "description": "fieldWeight in 35, product of:",
                "details": [
                  {
                    "value": 1,
                    "description": "tf(freq=1.0), with freq of:",
                    "details": [
                      {
                        "value": 1,
                        "description": "termFreq=1.0"
                      }
                    ]
                  },
                  {
                    "value": 6.9040728,
                    "description": "idf(docFreq=551, maxDocs=202323)"
                  },
                  {
                    "value": 1,
                    "description": "fieldNorm(doc=35)"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "value": 2.7758915,
        "description": "weight(FirstName:MHMT in 35) [PerFieldSimilarity], result of:",
        "details": [
          {
            "value": 2.7758915,
            "description": "score(doc=35,freq=1.0), product of:",
            "details": [
              {
                "value": 0.3952451,
                "description": "queryWeight, product of:",
                "details": [
                  {
                    "value": 7.0232153,
                    "description": "idf(docFreq=489, maxDocs=202323)"
                  },
                  {
                    "value": 0.056276944,
                    "description": "queryNorm"
                  }
                ]
              },
              {
                "value": 7.0232153,
                "description": "fieldWeight in 35, product of:",
                "details": [
                  {
                    "value": 1,
                    "description": "tf(freq=1.0), with freq of:",
                    "details": [
                      {
                        "value": 1,
                        "description": "termFreq=1.0"
                      }
                    ]
                  },
                  {
                    "value": 7.0232153,
                    "description": "idf(docFreq=489, maxDocs=202323)"
                  },
                  {
                    "value": 1,
                    "description": "fieldNorm(doc=35)"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  }
}

使用RubyGem，您将获得更具可读性的“解释”，例如

require 'elasticsearch'
client = Elasticsearch::Client.new
result = client.explain index: "megacorp", type: "employee", id: "1", q: "last_name:Smith"
puts Elasticsearch::API::Response::ExplainResponse.new(result["explanation"]).render
#=>
1.0 = 1.0(fieldWeight)
  1.0 = 1.0(tf(1.0)) x 1.0(idf(2/3)) x 1.0(fieldNorm)
    1.0 = 1.0(termFreq=1.0)

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这将有助于你了解分数，如果没有请让我知道解释的事情。。。。这也应该有所帮助