From 1402d601007e2cefb3bc61001179c521867941ae Mon Sep 17 00:00:00 2001
From: Alex Yatskov <alex@foosoft.net>
Date: Fri, 20 Mar 2015 20:15:47 +0900
Subject: [PATCH] Create compatibility feature

---
 server/search.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/server/search.js b/server/search.js
index 0dc20da..bdf41a3 100644
--- a/server/search.js
+++ b/server/search.js
@@ -193,6 +193,9 @@ function computeRecordGeo(records, context) {
 }
 
 function computeRecordPopularity(records, context, callback) {
+    var scoreMin = 0;
+    var scoreMax = 0;
+
     async.each(
         records,
         function(record, callback) {
@@ -213,12 +216,18 @@ function computeRecordPopularity(records, context, callback) {
                                     });
 
                                     var groupScore = innerProduct(context.profile, reviewFeatures);
+                                    scoreMin = Math.min(scoreMin, groupScore);
+                                    scoreMax = Math.max(scoreMax, groupScore);
+
                                     callback(err, groupScore);
                                 }
                             );
                         },
                         function(err, groupScores) {
-                            record.groupScores = groupScores;
+                            var scoreSum = _.reduce(groupScores, function(a, b) { return a + b; });
+                            var scoreAvg = scoreSum / groupScores.length;
+
+                            record.features.compatibility = (scoreAvg - scoreMin) / (scoreMax - scoreMin);
                             callback(err);
                         }
                     );