What is the function of ratioinfo in recommendation action sets?

[jhw_]

Hi I'm using recommendation action sets.

There is ratioinfo option in recomAls and recomKnnTrain action . well I can't find information about why ratioinfo affects model I made.

is it for considering bias of user?

please help me!  

proc cas;
recommend.recomKnnTrain result=r /
  table='ratings_by_user'
  label='knn3'
  system='movieRecommend'
  similarity='similar_items'                              
  k=20                                                                                                           
  hold='holdout_users'
  rateinfo='avg_user'                                   
  user=False;                                                      
run;

print r;
run;



proc cas;
recommend.recomAls result = r /
    tableU="ratings_by_user"                     
    tableI="ratings_by_item"                  
    system="movieRecommend"
    label="als1"
    casOutU={name="als_u1" replace=true}
    casOutI={name="als_i1" replace=true}
    rateinfo="avg_user"
    maxIter=20                                                   
    hold = "holdout_users"                  
    seed = 1234
    details = True                      
    k=50                                                                        
    /*fconv=1e-6 */
    stagnation = 10                         
    threshold = 0.1 ;                     
run;  

[joeFurbee]

Hi @jhw_, 

Do you mean rateinfo vs ratioinfo? If so, you can find more info in SAS Documentation for recomAls Action. rateinfo has the following definition: 

rateInfo={castable}

specifies the in-memory table that contains the rating summary information. Typically, the table contains the average rating for an item or the average rating by a user. The recomRateinfo action can be used to create these tables.

Moreover recomRateInfo action has the following:

Summarizes rating information.

Hope this is what you were looking for.