use full wiki_dpr instead of dummy

config.json

@@ -174,6 +174,6 @@
   "retrieval_batch_size": 8,
   "retrieval_vector_size": 768,
   "title_sep": " / ",
-  "use_dummy_dataset": true,
+  "use_dummy_dataset": false,
   "vocab_size": null
 }