Modified tokenizer_config.json, now includes <|endoftext|> token

tokenizer_config.json

@@ -1,3 +1,8 @@
 {
-  "tokenizer_class": "PreTrainedTokenizerFast"
-}
+  "add_prefix_space": false,
+  "bos_token": "<|endoftext|>",
+  "eos_token": "<|endoftext|>",
+  "name_or_path": "EleutherAI/gpt-neox-20b",
+  "tokenizer_class": "GPTNeoXTokenizer",
+  "unk_token": "<|endoftext|>"
+}