fix qwen eos token

src/llmtuner/tuner/core/loader.py

@@ -68,7 +68,9 @@ def load_model_and_tokenizer(
         padding_side=model_args.padding_side,
         **config_kwargs
     )
-    if tokenizer.pad_token_id is None or tokenizer.pad_token_id == 64000: # 64000 for baichuan model (older version)
+    if tokenizer.eos_token_id is None: # fix qwen tokenizer
+        tokenizer.eos_token = "<|endoftext|>"
+    if tokenizer.pad_token_id is None: # add pad token
         tokenizer.pad_token = tokenizer.eos_token
 
     config = AutoConfig.from_pretrained(model_args.model_name_or_path, **config_kwargs)