update the operator.

Signed-off-by: wxywb <xy.wang@zilliz.com>

README.md

@@ -38,10 +38,19 @@ towhee.dc(["Hello, world."]) \
 
 Create the operator via the following factory method
 
-***data2vec()***
+***data2vec(model_name='facebook/data2vec-text-base')***
 
-<br />
+**Parameters:**
+
+​  ***model_name***: *str*
 
+The model name in string.
+The default value is "facebook/data2vec-text-base". 
+
+Supported model name:
+- facebook/data2vec-text-base
+
+<br />
 
 
 ## Interface

data2vec_text.py

@@ -18,10 +18,10 @@ from towhee.operator.base import NNOperator
 
 class Data2VecText(NNOperator):
     def __init__(self, model_name):
-        self.model = model_name
-        self.tokenizer = RobertaTokenizer.from_pretrained("facebook/data2vec-text-base")
+        self.model = Data2VecTextModel.from_pretrained(model_name)
+        self.tokenizer = RobertaTokenizer.from_pretrained(model_name)
 
     def __call__(self, text: str) -> numpy.ndarray:
-        inputs = self.tokenizer(data, return_tensors="pt")
+        inputs = self.tokenizer(text, return_tensors="pt")
         outputs = self.model(**inputs)
-        return outputs.pooler_output.detach().cpu().numpy()
+        return outputs.pooler_output.detach().cpu().numpy().flatten()