Update llama.py

Author: danielhanchen

unsloth/models/llama.py

@@ -791,7 +791,7 @@ def _CausalLM_fast_forward(
         *args, **kwargs,
     ) -> Union[Tuple, CausalLMOutputWithPast]:
 
-        if past_key_values is not None:
+        if past_key_values is not None and self.config.model_type != "qwen2":
             outputs = fast_forward_inference(
                 self,
                 input_ids,