added learner to the output of the build subgroups widget

workflows/subgroup_discovery/db/package_data.json

@@ -78,7 +78,20 @@
       "variable": "rules", 
       "uid": "81a5d62c-9725-4ec1-a352-d18ef75e0a74", 
       "order": 1, 
-      "description": ""
+      "description": "rule set"
+    }
+  }, 
+  {
+    "pk": 374, 
+    "model": "workflows.abstractoutput", 
+    "fields": {
+      "widget": 211, 
+      "name": "SD learner", 
+      "short_name": "lrn", 
+      "variable": "learner", 
+      "uid": "0276e508-2822-4387-84ef-2c48243bf5c1", 
+      "order": 1, 
+      "description": "learner"
     }
   }, 
   {

workflows/subgroup_discovery/library.py

@@ -62,7 +62,7 @@ def build_subgroups_finished(postdata, input_dict, output_dict):
     # add id's
     for i, rule in enumerate(rules.rules):
         rule.id = i
-    return {'rules' : rules, 'classifier' : classifier}
+    return {'rules' : rules, 'classifier' : classifier, 'learner': learner}
 
 def subgroup_bar_visualization(input_dict):
     return {'rules' : None}