Patent ID: 11971941
Assignee: TONGJI UNIVERSITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. The online search method accounting for relevance and difference according to claim 1, wherein an obtaining expression of the final search result set is:, {
  
   
    
     
      
      
       
        
         rel
         ⁡
         (
         
          q
          ,
          
           d
           i
          
         
         )
        
        ≥
        
         δ
         0
        
       
       ,
       
        i
        =
        1
       
       ,
       2
       ,
       …
         
       ,
       k
      
     
    
   
   
    
     
      
      
       
        D
        *
       
       ⊂
       D
      
     
    
   
   
    
     
      
      
       
        
         ❘
         "\[LeftBracketingBar]"
        
        
         D
         *
        
        
         ❘
         "\[RightBracketingBar]"
        
       
       =
       k
      
     
    
   
   
    
     
      
      
       
        D
        *
       
       =
       
        
         
          arg
          ⁢
            
          max
         
         
          
           
            
             d
             i
            
            ⁢
            
             d
             i
            
           
           ∈
           D
          
          ,
          
           i
           =
           1
          
          ,
          2
          ,
            
          …
            
          ,
          k
         
        
        ⁢
        
         (
         
          
           ∑
           
            
             d
             i
            
            ,
            
             d
             j
            
            ,
            
             i
             ≠
             j
            
            ,
            
             d
             i
            
            ,
            
             
              d
              j
             
             ∈
             D
            
            ,
            i
            ,
            j
            ,
            
             ∈
             
              [
              
               1
               ,
               k
              
              ]
             
            
           
          
          
           div
           ⁡
           (
           
            
             d
             i
            
            ,
            
             d
             j
            
           
           )
          
         
         )
        
       
      
     
    
   
  
 

wherein, di is an i-th search result in the initial search result set, q is a query request, rel(q, di) is a relevance between the search result di and the query request q, δ0 is a relevance threshold, k is the number of search results in the final search result set, D* is the final search result set, D is the initial search result set, D={d1, d2, . . . , dn}, k<n, div(di, dj) is a difference value between the i-th search result di and the j-th search result dj.