Update special_tokens_map.json

special_tokens_map.json

@@ -12,6 +12,13 @@
     "normalized": false,
     "rstrip": false,
     "single_word": false
+  },
+    "pad_token": {
+    "content": "</s>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
   },
   "unk_token": {
     "content": "<unk>",