Patent ID: 11947626
Assignee: NEC CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 19:
20. The system of claim 15, wherein a covariance matrix of the negative pairs is given as:, ∑
    -
  
  ⁢
  
    =
    
      
        1
        
          N
          -
          1
        
      
      ⁢
      
        
          ∑
          
            i
            =
            1
          
          N
        
        ⁢
        
          
            (
            
              
                r
                i
                -
              
              -
              
                μ
                -
              
            
            )
          
          ⁢
          
            
              (
              
                
                  r
                  i
                  -
                
                -
                
                  μ
                  -
                
              
              )
            
            T
          
        
      
    
  

where N is a number of observations, ri+ is a tensor vector, and, μ
    -
  
  =
  
    
      1
      N
    
    ⁢
    
      
        ∑
        
          i
          =
          1
        
        N
      
      ⁢
      
        
          r
          i
          -
        
        .