diff --git a/config.pbtxt b/config.pbtxt
index 1476d27..3a65d03 100644
--- a/config.pbtxt
+++ b/config.pbtxt
@@ -7,7 +7,7 @@ input [
   {
     name: "INPUT"
     data_type: TYPE_STRING
-    dims: [ 1 ]
+    dims: [ -1 ]
   }
 ]
 
@@ -15,7 +15,7 @@ output [
   {
     name: "OUTPUT"
     data_type: TYPE_STRING
-    dims: [ 1 ]
+    dims: [ -1 ]
   }
 ]