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What does the pair of vertical lines in empirical entropy formula mean?


Is it ok to interprete PCA plot this way?What is the Q function and what is the V function in reinforcement learning?Image Captioning example in keras Approach?What is this formula, related to simple linear regression, called?PCA algorithm problems - PythonWhat does “likelihood” mean in the image?Clamping Q function to it's theoretical maximum, yes or no?How does binary cross entropy work?learning curve SklearnQ learning transition matrix trouble






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








2












$begingroup$


I am learning from this post.



$alpha$ is the ratio of the first subset,



$$alpha=fracD_1rightleft$$



according to the context and code of the post, $left|Dright|$ means the number of samples?



  • What are the pair of vertical lines called?

Is it the L1 norm symbol? It does not seem to be the absolute value symbol.










share|improve this question











$endgroup$


















    2












    $begingroup$


    I am learning from this post.



    $alpha$ is the ratio of the first subset,



    $$alpha=fracD_1rightleft$$



    according to the context and code of the post, $left|Dright|$ means the number of samples?



    • What are the pair of vertical lines called?

    Is it the L1 norm symbol? It does not seem to be the absolute value symbol.










    share|improve this question











    $endgroup$














      2












      2








      2





      $begingroup$


      I am learning from this post.



      $alpha$ is the ratio of the first subset,



      $$alpha=fracD_1rightleft$$



      according to the context and code of the post, $left|Dright|$ means the number of samples?



      • What are the pair of vertical lines called?

      Is it the L1 norm symbol? It does not seem to be the absolute value symbol.










      share|improve this question











      $endgroup$




      I am learning from this post.



      $alpha$ is the ratio of the first subset,



      $$alpha=fracD_1rightleft$$



      according to the context and code of the post, $left|Dright|$ means the number of samples?



      • What are the pair of vertical lines called?

      Is it the L1 norm symbol? It does not seem to be the absolute value symbol.







      machine-learning notation






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jun 8 at 23:01







      Jay

















      asked Jun 8 at 8:03









      JayJay

      1734 bronze badges




      1734 bronze badges




















          1 Answer
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          $begingroup$

          $D$ is a set which is further divided into sets $D_1$ and $D_2$. In this context the vertical lines represent the cardinality of the set i.e. the number of elements in the set. Hence, $alpha$ represents the ratio of number of samples of $D_1$ to $D$.






          share|improve this answer









          $endgroup$















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            1 Answer
            1






            active

            oldest

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            active

            oldest

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            active

            oldest

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            5












            $begingroup$

            $D$ is a set which is further divided into sets $D_1$ and $D_2$. In this context the vertical lines represent the cardinality of the set i.e. the number of elements in the set. Hence, $alpha$ represents the ratio of number of samples of $D_1$ to $D$.






            share|improve this answer









            $endgroup$

















              5












              $begingroup$

              $D$ is a set which is further divided into sets $D_1$ and $D_2$. In this context the vertical lines represent the cardinality of the set i.e. the number of elements in the set. Hence, $alpha$ represents the ratio of number of samples of $D_1$ to $D$.






              share|improve this answer









              $endgroup$















                5












                5








                5





                $begingroup$

                $D$ is a set which is further divided into sets $D_1$ and $D_2$. In this context the vertical lines represent the cardinality of the set i.e. the number of elements in the set. Hence, $alpha$ represents the ratio of number of samples of $D_1$ to $D$.






                share|improve this answer









                $endgroup$



                $D$ is a set which is further divided into sets $D_1$ and $D_2$. In this context the vertical lines represent the cardinality of the set i.e. the number of elements in the set. Hence, $alpha$ represents the ratio of number of samples of $D_1$ to $D$.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Jun 8 at 9:25









                bkshibkshi

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                1,1074 silver badges16 bronze badges



























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