Remove pooler

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

auto_transformers.py

@@ -40,6 +40,8 @@ class Model:
     def __init__(self, model_name, device, checkpoint_path):
         try:
             self.model = AutoModel.from_pretrained(model_name).to(device)
+            if hasattr(self.model, 'pooler') and self.model.pooler:
+                self.model.pooler = None
         except Exception as e:
             log.error(f"Fail to load model by name: {self.model_name}")
             raise e
@@ -52,7 +54,7 @@ class Model:
         self.model.eval()
 
     def __call__(self, *args, **kwargs):
-        outs = self.model(*args, **kwargs)
+        outs = self.model(*args, **kwargs, return_dict=True)
         return outs['last_hidden_state']