try to use class labels for the BBB+/BBB- labels

README.md

@@ -53,7 +53,11 @@ dataset_info:
     - name: "logBB"       
       dtype: float64 
     - name: "BBB+/BBB-"            
-      dtype: string           
+      dtype:
+        class_label:
+          names:
+            0: "BBB-"
+            1: "BBB+"
     - name: "Inchi"   
       dtype: string 
     - name: "threshold"