Update README.md

README.md

@@ -33,10 +33,10 @@ models used to generate them.
 
 | Domain | Role |
 |:--|:--|
-| EyePACS | held-out fold / training source |
-| APTOS | held-out fold / training source |
-| Messidor-2 | held-out fold / training source |
-| DDR | held-out fold / training source |
+| EyePACS | held-out fold / testing source |
+| APTOS | held-out fold / testing source |
+| Messidor-2 | held-out fold / testing source |
+| DDR | held-out fold / testing source |
 
 Each model is trained on 3 of the 4 domains and evaluated on the 4th, 
 held-out domain — the model never sees that domain during training or