Update parameters

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

README.md

@@ -48,14 +48,14 @@ import towhee
 
 Create the operator via the following factory method:
 
-***text_embedding.transformers(model_name="bert-base-uncased")***
+***text_embedding.transformers(model_name=None)***
 
 **Parameters:**
 
 ***model_name***: *str*
 
-The model name in string.
-The default model name is "bert-base-uncased".
+The model name in string, defaults to None.
+If None, the operator will be initialized without specified model.
 
 Supported model names:
 
@@ -307,6 +307,20 @@ Supported model names:
 
   - uw-madison/yoso-4096
 </details>
+  
+<br /> 
+
+***checkpoint_path***: *str*
+
+The path to local checkpoint, defaults to None.
+If None, the operator will download and load pretrained model by `model_name` from Huggingface transformers.
+
+<br /> 
+
+***tokenizer***: *object*
+
+The method to tokenize input text, defaults to None.
+If None, the operator will use default tokenizer by `model_name` from Huggingface transformers.
 
 <br />
 

auto_transformers.py

@@ -40,11 +40,19 @@ class AutoTransformers(NNOperator):
     NLP embedding operator that uses the pretrained transformers model gathered by huggingface.
     Args:
         model_name (`str`):
-            Which model to use for the embeddings.
+            The model name to load a pretrained model from transformers.
+        checkpoint_path (`str`):
+            The local checkpoint path.
+        tokenizer (`object`):
+            The tokenizer to tokenize input text as model inputs.
     """
 
-    def __init__(self, model_name: str = None, device: str = None, pretrain_weights_path=None,
-                 load_pretrain_f=None, tokenizer=None) -> None:
+    def __init__(self,
+                 model_name: str = None,
+                 checkpoint_path: str = None,
+                 tokenizer: object = None,
+                 device: str = None,
+                 ):
         super().__init__()
         if device is None:
             device = 'cuda' if torch.cuda.is_available() else 'cpu'
@@ -52,29 +60,31 @@ class AutoTransformers(NNOperator):
         self.model_name = model_name
 
         if self.model_name:
+            model_list = self.supported_model_names()
+            assert model_name in model_list, f"Invalid model name: {model_name}. Supported model names: {model_list}"
+
             try:
                 self.model = AutoModel.from_pretrained(model_name).to(self.device)
                 self.configs = self.model.config
             except Exception as e:
-                model_list = self.supported_model_names()
-                if model_name not in model_list:
-                    log.error(f"Invalid model name: {model_name}. Supported model names: {model_list}")
-                else:
-                    log.error(f"Fail to load model by name: {self.model_name}")
+                log.error(f"Fail to load model by name: {self.model_name}")
                 raise e
-            if pretrain_weights_path is not None:
-                if load_pretrain_f is None:
-                    state_dict = torch.load(pretrain_weights_path, map_location='cpu')
+            if checkpoint_path:
+                try:
+                    state_dict = torch.load(checkpoint_path, map_location=self.device)
                     self.model.load_state_dict(state_dict)
-                else:
-                    self.model = load_pretrain_f(self.model, pretrain_weights_path)
+                except Exception as e:
+                    log.error(f"Fail to load state dict from {checkpoint_path}: {e}")
             self.model.eval()
+
             if tokenizer is None:
                 try:
                     self.tokenizer = AutoTokenizer.from_pretrained(model_name)
                 except Exception as e:
-                    log.error(f'Fail to load tokenizer by name: {self.model_name}')
+                    log.error(f'Fail to load default tokenizer by name: {self.model_name}')
                     raise e
+            else:
+                self.tokenizer = tokenizer
         else:
             log.warning('The operator is initialized without specified model.')
             pass